# S&T Bancorp (STBA) 10-Q SEC filing - Q2 FY2026

- Filed: Aug 6, 2026, 4:53 PM EDT
- Fiscal quarter: Q2 FY2026
- Calendar quarter: Q2 2026
- Accession: 0000719220-26-000098
- OpenCapital page: https://www.opencapital.sh/filings/0000719220-26-000098
- Markdown URL: https://www.opencapital.sh/filings/0000719220-26-000098.md
- Official SEC filing index: https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/0000719220-26-000098-index.htm

## Filing documents

- [10-Q (stba-20260630.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/stba-20260630.htm)
- [EX-10.1 (exhibit101formofrestricted.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit101formofrestricted.htm)
- [EX-10.2 (exhibit102formofrestricted.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit102formofrestricted.htm)
- [EX-10.3 (exhibit103formofrestricted.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit103formofrestricted.htm)
- [EX-31.1 (exhibit311.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit311.htm)
- [EX-31.2 (exhibit312.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit312.htm)
- [EX-32 (exhibit32.htm)](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit32.htm)

---

## 10-Q

SEC source: [stba-20260630.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/stba-20260630.htm)

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

### FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2026

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 0-12508

S&T BANCORP INC.

(Exact name of registrant as specified in its charter)

|  |  |
| --- | --- |
| Pennsylvania | 25-1434426 |
| (State or other jurisdiction of incorporation or organization) | (IRS Employer Identification No.) |
| 800 Philadelphia Street | 15701 |
| (Address of principal executive offices) | (zip code) |

800-325-2265

(Registrant’s telephone number, including area code)

### Not Applicable

(Former name, former address, and former fiscal year, if changed since last report)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which registered

Common Stock, $2.50 par value STBA Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes  ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act. 

Large accelerated filer ☒ Accelerated filer ☐

Non-accelerated filer ☐ Smaller reporting company ☐

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

APPLICABLE ONLY TO CORPORATE ISSUERS:

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, $2.50 Par Value - 35,265,492 shares as of August 4, 2026

### S&T BANCORP, INC. AND SUBSIDIARIES

- Page No.
- [PART I. FINANCIAL INFORMATION](#ia7d84a7456464799a5bd4ecb9ee914c6_10)
- [Item 1.](#ia7d84a7456464799a5bd4ecb9ee914c6_13) [Condensed Consolidated Financial Statements](#ia7d84a7456464799a5bd4ecb9ee914c6_13)
- [C](#ia7d84a7456464799a5bd4ecb9ee914c6_16)[onsolidated Balance Sheets](#ia7d84a7456464799a5bd4ecb9ee914c6_16) [2](#ia7d84a7456464799a5bd4ecb9ee914c6_16)
- [Condensed Consolidated Statements of Comprehensive Income](#ia7d84a7456464799a5bd4ecb9ee914c6_19) [3](#ia7d84a7456464799a5bd4ecb9ee914c6_19)
- [C](#ia7d84a7456464799a5bd4ecb9ee914c6_22)[onsolidated Statements of Changes in Shareholders' Equity](#ia7d84a7456464799a5bd4ecb9ee914c6_22) [4](#ia7d84a7456464799a5bd4ecb9ee914c6_22)
- [Condensed Consolidated Statements of Cash Flows](#ia7d84a7456464799a5bd4ecb9ee914c6_28) [6](#ia7d84a7456464799a5bd4ecb9ee914c6_28)
- [Notes to](#ia7d84a7456464799a5bd4ecb9ee914c6_31)[Condensed](#ia7d84a7456464799a5bd4ecb9ee914c6_31)[Consolidated Financial Statements](#ia7d84a7456464799a5bd4ecb9ee914c6_31) [7](#ia7d84a7456464799a5bd4ecb9ee914c6_31)
- [Item 2.](#ia7d84a7456464799a5bd4ecb9ee914c6_91) [Management's Discussion and Analysis of Financial Condition and Results of Operations](#ia7d84a7456464799a5bd4ecb9ee914c6_91) [27](#ia7d84a7456464799a5bd4ecb9ee914c6_91)
- [Item 3.](#ia7d84a7456464799a5bd4ecb9ee914c6_133) [Quantitative and Qualitative Disclosures About Market Risk](#ia7d84a7456464799a5bd4ecb9ee914c6_133) [42](#ia7d84a7456464799a5bd4ecb9ee914c6_133)
- [Item 4.](#ia7d84a7456464799a5bd4ecb9ee914c6_136) [Controls and Procedures](#ia7d84a7456464799a5bd4ecb9ee914c6_136) [43](#ia7d84a7456464799a5bd4ecb9ee914c6_136)
- [PART II. OTHER INFORMATION](#ia7d84a7456464799a5bd4ecb9ee914c6_139)
- [Item 1.](#ia7d84a7456464799a5bd4ecb9ee914c6_142) [Legal Proceedings](#ia7d84a7456464799a5bd4ecb9ee914c6_142) [44](#ia7d84a7456464799a5bd4ecb9ee914c6_142)
- [Item 1A.](#ia7d84a7456464799a5bd4ecb9ee914c6_145) [Risk Factors](#ia7d84a7456464799a5bd4ecb9ee914c6_145) [44](#ia7d84a7456464799a5bd4ecb9ee914c6_145)
- [Item 2.](#ia7d84a7456464799a5bd4ecb9ee914c6_148) [Unregistered Sales of Equity Securities and Use of Proceeds](#ia7d84a7456464799a5bd4ecb9ee914c6_148) [44](#ia7d84a7456464799a5bd4ecb9ee914c6_148)
- [Item 3.](#ia7d84a7456464799a5bd4ecb9ee914c6_151) [Defaults Upon Senior Securities](#ia7d84a7456464799a5bd4ecb9ee914c6_151) [44](#ia7d84a7456464799a5bd4ecb9ee914c6_151)
- [Item 4.](#ia7d84a7456464799a5bd4ecb9ee914c6_154) [Mine Safety Disclosures](#ia7d84a7456464799a5bd4ecb9ee914c6_154) [44](#ia7d84a7456464799a5bd4ecb9ee914c6_154)
- [Item 5.](#ia7d84a7456464799a5bd4ecb9ee914c6_157) [Other Information](#ia7d84a7456464799a5bd4ecb9ee914c6_157) [44](#ia7d84a7456464799a5bd4ecb9ee914c6_157)
- [Item 6.](#ia7d84a7456464799a5bd4ecb9ee914c6_160) [Exhibits](#ia7d84a7456464799a5bd4ecb9ee914c6_160) [45](#ia7d84a7456464799a5bd4ecb9ee914c6_160)
- [Signatures](#ia7d84a7456464799a5bd4ecb9ee914c6_163) [46](#ia7d84a7456464799a5bd4ecb9ee914c6_163)

## Item 1. Condensed Consolidated Financial Statements

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unaudited)

_(in thousands, except share and per share data)

- (Unaudited)
- (Audited)_

| Line item | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| ASSETS |  |  |
| Cash and due from banks, including interest-bearing deposits of $146,384 and $106,286 at June 30, 2026 and December 31, 2025 | $217,819 | $163,436 |
| Securities available for sale, at fair value | 1,013,305 | 987,659 |
| Loans held for sale | 4,695 | 1,010 |
| Portfolio loans, net of unearned income | 8,058,386 | 8,071,957 |
| Allowance for credit losses | (93,320) | (93,178) |
| Portfolio loans, net | 7,965,066 | 7,978,779 |
| Bank owned life insurance | 86,584 | 85,421 |
| Premises and equipment, net | 42,731 | 43,855 |
| Federal Home Loan Bank and other restricted stock, at cost | 16,796 | 16,030 |
| Goodwill | 373,424 | 373,424 |
| Other intangible assets, net | 1,887 | 2,251 |
| Other assets | 221,706 | 219,115 |
| Total Assets | $9,944,013 | $9,870,980 |
| LIABILITIES |  |  |
| Deposits: |  |  |
| Noninterest-bearing demand | $2,256,542 | $2,160,645 |
| Interest-bearing demand | 769,495 | 790,278 |
| Money market | 2,183,937 | 2,196,998 |
| Savings | 881,967 | 862,118 |
| Certificates of deposit | 1,994,142 | 1,948,792 |
| Total Deposits | 8,086,083 | 7,958,831 |
| Short-term borrowings | 200,000 | 165,000 |
| Long-term borrowings | 25,773 | 50,815 |
| Junior subordinated debt securities | 49,508 | 49,478 |
| Other liabilities | 178,834 | 182,979 |
| Total Liabilities | 8,540,198 | 8,407,103 |
| SHAREHOLDERS’ EQUITY |  |  |
| Common stock ($2.50 par value)Authorized—50,000,000 sharesIssued—41,449,444 shares at June 30, 2026 and December 31, 2025Outstanding—35,264,936 shares at June 30, 2026 and 37,402,705 shares at December 31, 2025 | 103,623 | 103,623 |
| Additional paid-in capital | 411,087 | 412,969 |
| Retained earnings | 1,165,350 | 1,120,297 |
| Accumulated other comprehensive loss | (49,345) | (41,707) |
| Treasury stock — 6,184,508 shares at June 30, 2026 and 4,046,739 shares at December 31, 2025, at cost | (226,900) | (131,305) |
| Total Shareholders’ Equity | 1,403,815 | 1,463,877 |
| Total Liabilities and Shareholders’ Equity | $9,944,013 | $9,870,980 |

See Notes to Condensed Consolidated Financial Statements

**S&T BANCORP, INC. AND SUBSIDIARIES**

### CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

_(Unaudited)_

| (dollars in thousands, except per share data) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| INTEREST AND DIVIDEND INCOME |  |  |  |  |
| Loans, including fees | $116,960 | $117,696 | $232,254 | $232,036 |
| Investment Securities: |  |  |  |  |
| Taxable | 10,756 | 10,846 | 21,516 | 20,919 |
| Tax-exempt | 34 | 35 | 68 | 192 |
| Dividends | 309 | 329 | 554 | 607 |
| Total Interest and Dividend Income | 128,059 | 128,906 | 254,392 | 253,754 |
| INTEREST EXPENSE |  |  |  |  |
| Deposits | 35,399 | 39,056 | 71,085 | 77,410 |
| Borrowings, junior subordinated debt securities and other | 2,280 | 3,278 | 4,491 | 6,449 |
| Total Interest Expense | 37,679 | 42,334 | 75,576 | 83,859 |
| NET INTEREST INCOME | 90,380 | 86,572 | 178,816 | 169,895 |
| Provision for credit losses | 1,112 | 1,974 | 2,439 | (1,066) |
| Net Interest Income After Provision for Credit Losses | 89,268 | 84,598 | 176,377 | 170,961 |
| NONINTEREST INCOME |  |  |  |  |
| Net gain (loss) on sale of securities | 169 | — | 169 | (2,295) |
| Debit and credit card | 4,695 | 4,588 | 8,978 | 8,776 |
| Service charges on deposit accounts | 4,290 | 4,090 | 8,486 | 8,052 |
| Investment services and trust | 3,563 | 3,042 | 6,932 | 6,126 |
| Other | 2,143 | 1,780 | 3,937 | 3,270 |
| Total Noninterest Income | 14,860 | 13,500 | 28,502 | 23,929 |
| NONINTEREST EXPENSE |  |  |  |  |
| Salaries and employee benefits | 32,680 | 32,907 | 64,036 | 62,760 |
| Data processing and information technology | 5,163 | 4,847 | 10,321 | 9,777 |
| Occupancy | 4,074 | 4,024 | 8,666 | 8,326 |
| Furniture, equipment and software | 3,524 | 3,352 | 7,016 | 6,835 |
| Other taxes | 1,773 | 2,088 | 3,836 | 3,582 |
| Marketing | 1,876 | 1,490 | 3,343 | 3,105 |
| Professional services and legal | 1,286 | 1,739 | 2,531 | 3,025 |
| FDIC insurance | 1,074 | 1,062 | 2,147 | 2,102 |
| Other | 7,214 | 6,605 | 13,475 | 13,693 |
| Total Noninterest Expense | 58,664 | 58,114 | 115,371 | 113,205 |
| Income Before Taxes | 45,464 | 39,984 | 89,508 | 81,685 |
| Income tax expense | 8,821 | 8,084 | 17,793 | 16,384 |
| Net Income | $36,643 | $31,900 | $71,715 | $65,301 |
| Earnings per share—basic | $1.03 | $0.83 | $1.98 | $1.71 |
| Earnings per share—diluted | $1.02 | $0.83 | $1.96 | $1.69 |
| Dividends declared per share | $0.37 | $0.34 | $0.73 | $0.68 |
| Comprehensive Income | $34,774 | $40,133 | $64,077 | $89,891 |

See Notes to Condensed Consolidated Financial Statements

### S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY

(Unaudited)

_Three Months Ended June 30, 2025_

| (dollars in thousands, except share and per share data) | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Total |
| --- | --- | --- | --- | --- | --- | --- |
| Balance at March 31, 2025 | $103,623 | $412,787 | $1,059,367 | $(60,635) | $(97,108) | $1,418,034 |
| Net Income for the three months ended June 30, 2025 | — | — | 31,900 | — | — | 31,900 |
| Other comprehensive income, net of tax | — | — | — | 8,233 | — | 8,233 |
| Cash dividends declared ($0.34 per share) | — | — | (13,101) | — | — | (13,101) |
| Treasury stock issued for restricted stock awards, net of forfeitures (84,149 shares) | — | (3,818) | — | — | 2,323 | (1,495) |
| Recognition of restricted stock compensation expense | — | 1,922 | — | — | — | 1,922 |
| Balance at June 30, 2025 | $103,623 | $410,891 | $1,078,166 | $(52,402) | $(94,785) | $1,445,493 |
| See Notes to Condensed Consolidated Financial Statements |  |  |  |  |  |  |
|  | Three Months Ended June 30, 2026 |  |  |  |  |  |
| (dollars in thousands, except share and per share data) | CommonStock | AdditionalPaid-inCapital | RetainedEarnings | AccumulatedOtherComprehensive Income (Loss) | TreasuryStock | Total |
| Balance at March 31, 2026 | $103,623 | $413,929 | $1,141,963 | $(47,476) | $(181,358) | $1,430,681 |
| Net income for the three months ended June 30, 2026 | — | — | 36,643 | — | — | 36,643 |
| Other comprehensive loss, net of tax | — | — | — | (1,869) | — | (1,869) |
| Cash dividends declared ($0.37 per share) | — | — | (13,256) | — | — | (13,256) |
| Treasury stock issued for restricted stock awards, net of forfeitures (80,211 shares) | — | (4,251) | — | — | 2,545 | (1,706) |
| Repurchase of S&T stock (1,074,924 shares) | — | — | — | — | (48,087) | (48,087) |
| Recognition of restricted stock compensation expense | — | 1,409 | — | — | — | 1,409 |
| Balance at June 30, 2026 | $103,623 | $411,087 | $1,165,350 | $(49,345) | $(226,900) | $1,403,815 |
| See Notes to Condensed Consolidated Financial Statements |  |  |  |  |  |  |

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY

(Unaudited)

_Six Months Ended June 30, 2025_

| (dollars in thousands, except share and per share data) | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Total |
| --- | --- | --- | --- | --- | --- | --- |
| Balance at January 1, 2025 | $103,623 | $411,785 | $1,039,035 | $(76,992) | $(97,157) | $1,380,294 |
| Net income for the six months ended June 30, 2025 | — | — | 65,301 | — | — | 65,301 |
| Other comprehensive income, net of tax | — | — | — | 24,590 | — | 24,590 |
| Cash dividends declared ($0.68 per share) | — | — | (26,170) | — | — | (26,170) |
| Treasury stock issued for restricted stock awards, net of forfeitures (85,999 shares) | — | (3,908) | — | — | 2,372 | (1,536) |
| Recognition of restricted stock compensation expense | — | 3,014 | — | — | — | 3,014 |
| Balance at June 30, 2025 | $103,623 | $410,891 | $1,078,166 | $(52,402) | $(94,785) | $1,445,493 |
| See Notes to Condensed Consolidated Financial Statements |  |  |  |  |  |  |
|  | Six Months Ended June 30, 2026 |  |  |  |  |  |
| (dollars in thousands, except share and per share data) | CommonStock | AdditionalPaid-inCapital | RetainedEarnings | AccumulatedOtherComprehensive Income (Loss) | TreasuryStock | Total |
| Balance at January 1, 2026 | $103,623 | $412,969 | $1,120,297 | $(41,707) | $(131,305) | $1,463,877 |
| Net income for the six months ended June 30, 2026 | — | — | 71,715 | — | — | 71,715 |
| Other comprehensive loss, net of tax | — | — | — | (7,638) | — | (7,638) |
| Cash dividends declared ($0.73 per share) | — | — | (26,662) | — | — | (26,662) |
| Treasury stock issued for restricted stock awards, net of forfeitures (83,255 shares) | — | (4,400) | — | — | 2,666 | (1,734) |
| Repurchase of S&T Stock (2,221,024 shares) | — | — | — | — | (98,261) | (98,261) |
| Recognition of restricted stock compensation expense | — | 2,518 | — | — | — | 2,518 |
| Balance at June 30, 2026 | $103,623 | $411,087 | $1,165,350 | $(49,345) | $(226,900) | $1,403,815 |

See Notes to Condensed Consolidated Financial Statements

**S&T BANCORP, INC. AND SUBSIDIARIES**

### CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

_(Unaudited)_

| (dollars in thousands) | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- |
| OPERATING ACTIVITIES |  |  |
| Net Cash Provided by Operating Activities | $70,331 | $57,194 |
| INVESTING ACTIVITIES |  |  |
| Purchases of securities | (139,127) | (113,637) |
| Proceeds from maturities, prepayments and calls of securities | 71,506 | 57,437 |
| Proceeds from sales of securities | 33,042 | 47,038 |
| Purchases of Federal Home Loan Bank stock | (766) | (586) |
| Net decrease (increase) in loans | 3,987 | (192,294) |
| Proceeds from sale of portfolio loans | 7,040 | — |
| Purchases of premises and equipment, net of proceeds from sales | (1,816) | (2,916) |
| Net payments from cash flow hedge | (1,304) | (3,972) |
| Net Cash Used in Investing Activities | (27,438) | (208,930) |
| FINANCING ACTIVITIES |  |  |
| Net increase in demand, money market and savings deposits | 81,902 | 119,995 |
| Net increase in certificates of deposit | 45,350 | 17,808 |
| Net increase in short-term borrowings | 35,000 | — |
| Repayments on long-term borrowings | (25,042) | (40) |
| Repurchase of shares for taxes on restricted stock | (1,734) | (1,536) |
| Cash dividends paid to common shareholders | (26,697) | (26,193) |
| Repurchase of common stock | (97,289) | — |
| Net Cash Provided by Financing Activities | 11,490 | 110,034 |
| Net increase (decrease) in cash and due from banks | 54,383 | (41,702) |
| Cash and due from banks at beginning of period | 163,436 | 244,820 |
| Cash and Due From Banks at End of Period | $217,819 | $203,118 |
| Supplemental Disclosures |  |  |
| Right of use assets obtained in exchange for lease obligations | — | $2,400 |
| Cash paid for interest | $76,985 | $86,041 |
| Cash paid for federal income taxes, net of refunds | $16,500 | $10,450 |
| Cash paid for state income taxes, net of refunds | $526 | $663 |
| See Notes to Condensed Consolidated Financial Statements |  |  |

### S&T BANCORP, INC. AND SUBSIDIARIES

### NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

### NOTE 1. BASIS OF PRESENTATION

#### Principles of Consolidation

The interim Condensed Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.

#### Basis of Presentation

The accompanying unaudited interim Condensed Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the audited Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2025, or 2025 Form 10-K, filed with the Securities and Exchange Commission, or SEC. In the opinion of management, the accompanying interim financial information reflects all adjustments, consisting of normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.

#### Reclassification

Amounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no effect on our condensed consolidated financial statements.

#### Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.

#### Segments

We have one operating segment, Community Banking, based upon our current reporting structure at the consolidated level. The chief operating decision maker, or CODM, uses consolidated net income when allocating resources and making operating decisions. The accounting policies used to measure the profit and loss of the Community Banking segment are the same as those described in the summary of significant accounting policies in our 2025 Form 10-K. The CODM does not review segment revenue or expense information at a lower level than what is included in our Consolidated Statements of Net Income. Expenses included within other expenses in the Condensed Consolidated Statements of Comprehensive Income include loan related expenses, travel and entertainment, insurance expenses and contributions.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

#### Recently Adopted Accounting Standards Updates, or ASU, or Updated

There were no recently adopted accounting standards updates in the second quarter of 2026.

#### Recently Issued Accounting Standards Not Yet Adopted

#### Income Statement (Subtopic 220-40)—Reporting Comprehensive Income—Expense Disaggregation Disclosures

 In November 2024, the FASB issued ASU 2024-03, Income Statement (Subtopic 220-40)—Reporting Comprehensive Income—Expense Disaggregation Disclosures to improve the disclosures about a public business entity’s expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions. The amendments in this update are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. This ASU will not impact our consolidated financial statements and we are currently evaluating the impact of the new disclosure requirements.

#### Interim Reporting (Topic 270)—Narrow-Scope Improvements

 In December 2025, the FASB issued ASU 2025-11, Interim Reporting (Topic 270)—Narrow-Scope Improvements to improve the navigability of the required interim disclosures and clarify when the guidance is applicable. The amendments also provide additional guidance on what disclosures should be provided in interim reporting periods. The amendments add to Topic 270 a principle that requires entities to disclose events since the end of the last annual reporting period that have a material impact on the entity. The amendments in this update are effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods beginning after December 15, 2028. Early adoption is permitted. This ASU is not expected to have a material impact on disclosures.

### NOTE 2. EARNINGS PER SHARE

The treasury stock method was used to determine earnings per share for the three and six months ended June 30, 2026 and 2025. The following table reconciles the numerators and denominators of basic and diluted EPS calculations for the periods presented:

| (in thousands, except share and per share data) | Three months ended June 30, 2026 | Three months ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Numerator for Earnings per Share—Basic and Diluted: |  |  |  |  |
| Net income | $36,643 | $31,900 | $71,715 | $65,301 |
| Denominator for Earnings per Share: |  |  |  |  |
| Weighted Average Shares Outstanding—Basic | 35,717,383 | 38,337,851 | 36,283,830 | 38,299,511 |
| Add: Potentially dilutive shares | 293,066 | 299,549 | 307,191 | 319,230 |
| Denominator—Diluted | 36,010,449 | 38,637,400 | 36,591,021 | 38,618,741 |
| Earnings per share—basic | $1.03 | $0.83 | $1.98 | $1.71 |
| Earnings per share—diluted | $1.02 | $0.83 | $1.96 | $1.69 |
| Restricted stock considered anti-dilutive excluded from potentially dilutive shares | 76 | 55 | 109 | 28 |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

### NOTE 3. FAIR VALUE MEASUREMENTS

We use fair value measurements when recording and disclosing certain financial assets and liabilities. Debt securities, equity securities, securities held in a deferred compensation plan and derivative financial instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other financial instruments at fair value on a nonrecurring basis, such as loans held for sale, loans individually evaluated, other real estate owned, or OREO, and other repossessed assets, mortgage servicing rights, or MSRs, and certain other assets.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability which are developed based on market data that we have obtained from independent sources. Unobservable inputs reflect our estimates of assumptions that market participants would use in pricing an asset or liability which are developed based on the best information available in the circumstances.

The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows.

Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.

Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.

Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.

A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

There have been no changes in our valuation methodologies during the three and six months ended June 30, 2026. Refer to Note 1. Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in our 2025 Form 10-K for more information on the valuation methodologies that we use for financial instruments recorded at fair value on a recurring or nonrecurring basis.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

#### Assets and Liabilities Recorded at Fair Value on a Recurring Basis

The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at the dates presented:

_June 30, 2026_

| (dollars in thousands) | Level 1 | Level 2 | Level 3 | Total |
| --- | --- | --- | --- | --- |
| ASSETS |  |  |  |  |
| Available-for-sale debt securities: |  |  |  |  |
| U.S. Treasury securities | $54,360 | — | — | $54,360 |
| Collateralized mortgage obligations of U.S. government corporations and agencies(1) | — | 641,891 | — | 641,891 |
| Residential mortgage-backed securities of U.S. government corporations and agencies(1) | — | 31,916 | — | 31,916 |
| Commercial mortgage-backed securities of U.S. government corporations | — | 277,442 | — | 277,442 |
| Obligations of states and political subdivisions | — | 4,850 | — | 4,850 |
| Total Available-for-Sale Debt Securities | 54,360 | 956,099 | — | 1,010,459 |
| Equity securities | 2,846 | — | — | 2,846 |
| Total Securities Available for Sale | 57,206 | 956,099 | — | 1,013,305 |
| Securities held in a deferred compensation plan | 12,152 | — | — | 12,152 |
| Derivative financial assets: |  |  |  |  |
| Interest rate swap contracts - commercial loans | — | 34,965 | — | 34,965 |
| Interest rate lock commitments - mortgage loans | — | — | 91 | 91 |
| Total Assets | $69,358 | $991,064 | $91 | $1,060,513 |
| LIABILITIES |  |  |  |  |
| Derivative financial liabilities: |  |  |  |  |
| Interest rate swap contracts - commercial loans | — | $35,194 | — | $35,194 |
| Interest rate swap contracts - cash flow hedge | — | 1,522 | — | 1,522 |
| Total Liabilities | — | $36,716 | — | $36,716 |
| (1)Collateralized mortgage obligations and residential mortgage-backed securities consist primarily of securities guaranteed by Fannie Mae, Freddie Mac and Ginnie Mae. |  |  |  |  |

_December 31, 2025_

| (dollars in thousands) | Level 1 | Level 2 | Level 3 | Total |
| --- | --- | --- | --- | --- |
| ASSETS |  |  |  |  |
| Available-for-sale debt securities: |  |  |  |  |
| U.S. Treasury securities | $84,507 | — | — | $84,507 |
| Collateralized mortgage obligations of U.S. government corporations and agencies(1) | — | 624,263 | — | 624,263 |
| Residential mortgage-backed securities of U.S. government corporations and agencies(1) | — | 31,336 | — | 31,336 |
| Commercial mortgage-backed securities of U.S. government corporations | — | 241,262 | — | 241,262 |
| Obligations of states and political subdivisions | — | 4,909 | — | 4,909 |
| Total Available-for-Sale Debt Securities | 84,507 | 901,770 | — | 986,277 |
| Equity securities | 1,382 | — | — | 1,382 |
| Total Securities Available for Sale | 85,889 | 901,770 | — | 987,659 |
| Securities held in a deferred compensation plan | 14,212 | — | — | 14,212 |
| Derivative financial assets: |  |  |  |  |
| Interest rate swap contracts - commercial loans | — | 33,669 | — | 33,669 |
| Interest rate lock commitments - mortgage loans | — | — | 81 | 81 |
| Total Assets | $100,101 | $935,439 | $81 | $1,035,621 |
| LIABILITIES |  |  |  |  |
| Derivative financial liabilities: |  |  |  |  |
| Interest rate swap contracts - commercial loans | — | $33,990 | — | $33,990 |
| Interest rate swap contracts - cash flow hedge | — | 2,024 | — | 2,024 |
| Total Liabilities | — | $36,014 | — | $36,014 |
| (1)Collateralized mortgage obligations and residential mortgage-backed securities consist primarily of securities guaranteed by Fannie Mae, Freddie Mac and Ginnie Mae. |  |  |  |  |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

#### Assets Recorded at Fair Value on a Nonrecurring Basis

We may be required to measure certain assets and liabilities at fair value on a nonrecurring basis. These assets and liabilities are recorded at the lower of cost or fair value in our consolidated financial statements and are remeasured only when events or circumstances indicate impairment. At June 30, 2026, individually evaluated loans of $8.6 million were measured at fair value on a nonrecurring basis and classified as Level 3. At December 31, 2025 individually evaluated loans of $10.6 million were classified as Level 3 and $5.3 million were classified as Level 2. There were no liabilities measured at fair value on a nonrecurring basis at both June 30, 2026 and December 31, 2025.

Significant unobservable inputs used in the fair value measurements of Level 3 assets on a nonrecurring basis at June 30, 2026 and December 31, 2025 were as follows:

| (dollars in thousands) | June 30, 2026 | Valuation Technique | Significant Unobservable Inputs(1) | Collateral Adjustment(2) |
| --- | --- | --- | --- | --- |
| Loans individually evaluated | $8,559 | Collateral based valuation | Collateral adjustments | 25% |
| (1)Represents discount adjustments to collateral values related to anticipated collection rates of accounts receivable based on management judgment. |  |  |  |  |
| (2)Represents the collateral adjustment of one loan. |  |  |  |  |
| (dollars in thousands) | December 31, 2025 | Valuation Technique | Significant Unobservable Inputs(1) | Collateral Adjustment(2) |
| Loans individually evaluated | $10,641 | Collateral based valuation | Collateral adjustments | 10% |
| (1)Represents discount adjustments to collateral values related to anticipated collection rates of accounts receivable based on management judgment. |  |  |  |  |
| (2)Represents the collateral adjustment of one loan. |  |  |  |  |

#### Fair Value of Financial Instruments

The following tables present the carrying values and fair values of our financial instruments at the dates presented:

| (dollars in thousands) | Carrying Value(1) | Fair Value Measurements at June 30, 2026 / Total | Fair Value Measurements at June 30, 2026 / Level 1 | Fair Value Measurements at June 30, 2026 / Level 2 | Fair Value Measurements at June 30, 2026 / Level 3 |
| --- | --- | --- | --- | --- | --- |
| ASSETS |  |  |  |  |  |
| Cash and due from banks, including interest-bearing deposits | $217,819 | $217,819 | $217,819 | — | — |
| Securities available for sale | 1,013,305 | 1,013,305 | 57,206 | 956,099 | — |
| Loans held for sale | 4,695 | 4,695 | — | 4,695 | — |
| Portfolio loans, net | 7,965,066 | 7,786,180 | — | — | 7,786,180 |
| Securities held in a deferred compensation plan | 12,152 | 12,152 | 12,152 | — | — |
| Mortgage servicing rights | 4,860 | 7,989 | — | — | 7,989 |
| Interest rate swap contracts - commercial loans | 34,965 | 34,965 | — | 34,965 | — |
| Interest rate lock commitments - mortgage loans | 91 | 91 | — | — | 91 |
| LIABILITIES |  |  |  |  |  |
| Deposits | $8,086,083 | $8,079,694 | $6,091,941 | $1,987,753 | — |
| Collateral payable | 31,837 | 31,837 | 31,837 | — | — |
| Short-term borrowings | 200,000 | 200,000 | — | 200,000 | — |
| Long-term borrowings | 25,773 | 25,768 | — | 25,768 | — |
| Junior subordinated debt securities | 49,508 | 49,508 | — | 49,508 | — |
| Interest rate swap contracts - commercial loans | 35,194 | 35,194 | — | 35,194 | — |
| Interest rate swap contracts - cash flow hedge | 1,522 | 1,522 | — | 1,522 | — |
| (1) As reported in the Consolidated Balance Sheets |  |  |  |  |  |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

| (dollars in thousands) | Carrying Value(1) | Fair Value Measurements at December 31, 2025 / Total | Fair Value Measurements at December 31, 2025 / Level 1 | Fair Value Measurements at December 31, 2025 / Level 2 | Fair Value Measurements at December 31, 2025 / Level 3 |
| --- | --- | --- | --- | --- | --- |
| ASSETS |  |  |  |  |  |
| Cash and due from banks, including interest-bearing deposits | $163,436 | $163,436 | $163,436 | — | — |
| Securities available for sale | 987,659 | 987,659 | 85,889 | 901,770 | — |
| Loans held for sale | 1,010 | 1,010 | — | 1,010 |  |
| Portfolio loans, net | 7,978,779 | 7,807,824 | — | — | 7,807,824 |
| Collateral receivable | 2 | 2 | 2 | — | — |
| Securities held in a deferred compensation plan | 14,212 | 14,212 | 14,212 | — | — |
| Mortgage servicing rights | 5,034 | 8,034 | — | — | 8,034 |
| Interest rate swaps - commercial loans | 33,669 | 33,669 | — | 33,669 | — |
| Interest rate lock commitments | 81 | 81 | — | — | 81 |
| LIABILITIES |  |  |  |  |  |
| Deposits | $7,958,831 | $7,956,632 | $6,010,039 | $1,946,593 | — |
| Collateral payable | 26,964 | 26,964 | 26,964 | — | — |
| Short-term borrowings | 165,000 | 165,000 | — | 165,000 | — |
| Long-term borrowings | 50,815 | 50,856 | — | 50,856 | — |
| Junior subordinated debt securities | 49,478 | 49,478 | — | 49,478 | — |
| Interest rate swaps - commercial loans | 33,990 | 33,990 | — | 33,990 | — |
| Interest rate swaps - cash flow hedge | 2,024 | 2,024 | — | 2,024 | — |
| (1) As reported in the Consolidated Balance Sheets |  |  |  |  |  |

### NOTE 4. SECURITIES

The following table presents the fair values of our securities portfolio at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Debt securities | $1,010,459 | $986,277 |
| Equity securities | 2,846 | 1,382 |
| Total Securities Available for Sale | $1,013,305 | $987,659 |

The following table presents the amortized cost and fair value of available-for-sale debt securities at the dates presented:

| (dollars in thousands) | June 30, 2026 / Amortized Cost | June 30, 2026 / Gross Unrealized Gains | June 30, 2026 / Gross Unrealized Losses | June 30, 2026 / Fair Value | December 31, 2025 / Amortized Cost | December 31, 2025 / Gross Unrealized Gains | December 31, 2025 / Gross Unrealized Losses | December 31, 2025 / Fair Value |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| U.S. Treasury securities | $55,399 | $13 | $(1,052) | $54,360 | $86,381 | $110 | $(1,984) | $84,507 |
| Collateralized mortgage obligations of U.S. government corporations and agencies(2) | 677,097 | 797 | (36,003) | 641,891 | 650,314 | 4,961 | (31,012) | 624,263 |
| Residential mortgage-backed securities of U.S. government corporations and agencies(2) | 36,669 | 5 | (4,758) | 31,916 | 35,994 | 7 | (4,665) | 31,336 |
| Commercial mortgage-backed securities of U.S. government corporations | 282,228 | 523 | (5,309) | 277,442 | 243,571 | 2,411 | (4,720) | 241,262 |
| Obligations of states and political subdivisions | 4,849 | 1 | — | 4,850 | 4,902 | 7 | — | 4,909 |
| Total Available-for-Sale Debt Securities(1) | $1,056,242 | $1,339 | $(47,122) | $1,010,459 | $1,021,162 | $7,496 | $(42,381) | $986,277 |

(1) Excludes interest receivable of $3.4 million at June 30, 2026 and $3.3 million at December 31, 2025. Interest receivable is included in other assets in the Consolidated Balance Sheets.

(2) Collateralized mortgage obligations and residential mortgage-backed securities consist primarily of securities guaranteed by Fannie Mae, Freddie Mac and Ginnie Mae.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following tables present the fair value and the age of gross unrealized losses on available-for-sale debt securities by investment category at the dates presented:

_June 30, 2026_

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  | Less Than 12 Months |  |  |  |  | 12 Months or More |  |  |  |  | Total |  |  |  |  |
| (dollars in thousands) | Number of Securities | Fair Value |  | UnrealizedLosses |  | Number of Securities | Fair Value |  | UnrealizedLosses |  | Number of Securities | Fair Value |  | UnrealizedLosses |  |
| U.S. Treasury securities | 1 | $ | $9,841 | $ | $(57) | 4 | $ | $39,522 | $ | $(995) | 5 | $ | $49,363 | $ | $(1,052) |
| Collateralized mortgage obligations of U.S. government corporations and agencies | 29 | 235,534 |  | (2,939) |  | 52 | 260,286 |  | (33,064) |  | 81 | 495,820 |  | (36,003) |  |
| Residential mortgage-backed securities of U.S. government corporations and agencies | 1 | 2,490 |  | (28) |  | 11 | 29,271 |  | (4,730) |  | 12 | 31,761 |  | (4,758) |  |
| Commercial mortgage-backed securities of U.S. government corporations | 12 | 113,228 |  | (1,282) |  | 7 | 79,639 |  | (4,027) |  | 19 | 192,867 |  | (5,309) |  |
| Total | 43 | $ | $361,093 | $ | $(4,306) | 74 | $ | $408,718 | $ | $(42,816) | 117 | $ | $769,811 | $ | $(47,122) |

_December 31, 2025_

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  | Less Than 12 Months |  |  |  |  | 12 Months or More |  |  |  |  | Total |  |  |  |  |
| (dollars in thousands) | Number of Securities | Fair Value |  | UnrealizedLosses |  | Number of Securities | Fair Value |  | UnrealizedLosses |  | Number of Securities | Fair Value |  | UnrealizedLosses |  |
| U.S. Treasury securities | — | $ | — | $ | — | 7 | $ | $69,409 | $ | $(1,984) | 7 | $ | $69,409 | $ | $(1,984) |
| Collateralized mortgage obligations of U.S. government corporations and agencies | 4 | 34,993 |  | (52) |  | 55 | 299,732 |  | (30,960) |  | 59 | 334,725 |  | (31,012) |  |
| Residential mortgage-backed securities of U.S. government corporations and agencies | — | — |  | — |  | 15 | 31,171 |  | (4,665) |  | 15 | 31,171 |  | (4,665) |  |
| Commercial mortgage-backed securities of U.S. government corporations | 1 | 9,943 |  | (29) |  | 10 | 114,107 |  | (4,691) |  | 11 | 124,050 |  | (4,720) |  |
| Total | 5 | $ | $44,936 | $ | $(81) | 87 | $ | $514,419 | $ | $(42,300) | 92 | $ | $559,355 | $ | $(42,381) |

We evaluate securities with unrealized losses quarterly to determine if the decline in fair value has resulted from credit impairment or other factors. We do not believe any individual unrealized loss as of June 30, 2026 represents a credit impairment. The unrealized losses on debt securities were attributable to changes in interest rates and not related to the credit quality of the issuers. All debt securities were determined to be investment grade and paying principal and interest according to the contractual terms of the security. As of June 30, 2026, we do not intend to sell, and it is more likely than not that we will not be required to sell, the securities in an unrealized loss position before recovery of their amortized cost.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following table presents net unrealized gains and losses, net of tax, on available-for-sale debt securities included in accumulated other comprehensive loss, for the periods presented:

| (dollars in thousands) | June 30, 2026 / Gross Unrealized Gains | June 30, 2026 / Gross Unrealized Losses | June 30, 2026 / Net Unrealized Losses | December 31, 2025 / Gross Unrealized Gains | December 31, 2025 / Gross Unrealized Losses | December 31, 2025 / Net Unrealized Losses |
| --- | --- | --- | --- | --- | --- | --- |
| Total unrealized gains (losses) on available-for-sale debt securities | $1,339 | $(47,122) | $(45,783) | $7,496 | $(42,381) | $(34,885) |
| Income tax (expense) benefit | (288) | 10,143 | 9,855 | (1,614) | 9,123 | 7,509 |
| Net Unrealized Losses, Net of Tax Included in Accumulated Other Comprehensive Loss | $1,051 | $(36,979) | $(35,928) | $5,882 | $(33,258) | $(27,376) |

The amortized cost and fair value of available-for-sale debt securities at June 30, 2026 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

_June 30, 2026_

| (dollars in thousands) | Amortized Cost | Fair Value |
| --- | --- | --- |
| Obligations of the U.S. Treasury, U.S. government corporations and agencies and obligations of states and political subdivisions |  |  |
| Due in one year or less | $20,080 | $20,031 |
| Due after one year through five years | 30,270 | 29,337 |
| Due after five years through ten years | 9,898 | 9,842 |
| Due after ten years | — | — |
| Available-for-Sale Debt Securities With Fixed Maturities | 60,248 | 59,210 |
| Debt Securities without a single maturity date |  |  |
| Collateralized mortgage obligations of U.S. government corporations and agencies | 677,097 | 641,891 |
| Residential mortgage-backed securities of U.S. government corporations and agencies | 36,669 | 31,916 |
| Commercial mortgage-backed securities of U.S. government corporations | 282,228 | 277,442 |
| Total Available-for-Sale Debt Securities | $1,056,242 | $1,010,459 |

Debt securities are pledged in order to meet various regulatory and legal requirements. Restricted pledged securities had a carrying value of $40.4 million at June 30, 2026 and $38.3 million at December 31, 2025. Unrestricted pledged securities had a carrying value of $204.5 million at June 30, 2026 and $202.0 million at December 31, 2025. Any sales of or changes to the pledged status of restricted pledged securities requires approval of the beneficiary. Approval is not required in order to sell or make changes to the pledged status for unrestricted pledged securities.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

### NOTE 5. LOANS AND ALLOWANCE FOR CREDIT LOSSES

#### Loans and Loans Held for Sale

Loans are presented net of unearned income. Unearned income consisted of net deferred loan fees and costs of $3.6 million at June 30, 2026 and $4.8 million at December 31, 2025 and a discount related to purchase accounting fair value adjustments of $1.7 million at June 30, 2026 and $2.0 million at December 31, 2025.

The following table summarizes the composition of our loan portfolio at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Commercial real estate | $2,784,318 | $2,921,761 |
| Commercial and industrial | 1,408,034 | 1,330,605 |
| Commercial construction | 466,210 | 365,377 |
| Business banking | 1,289,133 | 1,315,863 |
| Consumer real estate | 2,030,605 | 2,047,071 |
| Other consumer | 80,086 | 91,280 |
| Total Portfolio Loans | $8,058,386 | $8,071,957 |
| Loans held for sale | 4,695 | 1,010 |
| Total Loans(1) | $8,063,081 | $8,072,967 |

(1) Excludes interest receivable of $32.4 million at June 30, 2026 and $33.4 million at December 31, 2025. Interest receivable is included in other assets in the Consolidated Balance Sheets.

#### Modifications to Borrowers Experiencing Financial Difficulty

The following tables present the amortized cost of loans to borrowers experiencing financial difficulty by portfolio segment and type of modification during the periods presented:

| (dollars in thousands) | Three Months Ended June 30, 2026 / Term Extension | Term Extension and Payment Delays | Total | % of Portfolio Segment |
| --- | --- | --- | --- | --- |
| Commercial real estate | — | $3,520 | $3,520 | 0.13% |
| Commercial and industrial | — | 1,883 | 1,883 | 0.13% |
| Consumer real estate | 231 | — | 231 | 0.01% |
| Total | $231 | $5,403 | $5,634 | 0.07% |
|  | Three Months Ended June 30, 2025 |  |  |  |
| (dollars in thousands) | Term Extension | Term Extension and Payment Delays | Total | % of Portfolio Segment |
| Commercial and industrial | $9,549 | — | $9,549 | 0.72% |
| Consumer real estate | 14 | 630 | 644 | 0.03% |
| Total | $9,563 | $630 | $10,193 | 0.13% |

| (dollars in thousands) | Six Months Ended June 30, 2026 / Term Extension | Term Extension and Payment Delays | Total | % of Portfolio Segment |
| --- | --- | --- | --- | --- |
| Commercial real estate | — | $3,520 | $3,520 | 0.13% |
| Commercial and industrial | 4,038 | 14,032 | 18,070 | 1.28% |
| Business banking | 18 | — | 18 | — |
| Consumer real estate | 369 | — | 369 | 0.02% |
| Total | $4,425 | $17,552 | $21,977 | 0.27% |
|  | Six Months Ended June 30, 2025 |  |  |  |
| (dollars in thousands) | Term Extension | Term Extension and Payment Delays | Total | % of Portfolio Segment |
| Commercial and industrial | $9,549 | $2,042 | $11,591 | 0.88% |
| Consumer real estate | 276 | 630 | 906 | 0.05% |
| Total | $9,825 | $2,672 | $12,497 | 0.16% |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following tables describe the effect of loan modifications made to borrowers experiencing financial difficulty during the periods presented:

| Line item | Three Months Ended June 30, 2026 / Weighted-Average Term Extension (in months) | Six Months Ended June 30, 2026 / Weighted-Average Term Extension and Payment Delays (in months) | Weighted-Average Term Extension (in months) | Weighted-Average Term Extension and Payment Delays (in months) |
| --- | --- | --- | --- | --- |
| Commercial real estate | — | 14 | — | 14 |
| Commercial and industrial | — | 6 | 12 | 4 |
| Business banking | — | — | 12 | — |
| Consumer real estate | 276 | — | 303 | — |

| Line item | Three Months Ended June 30, 2025 / Weighted-Average Term Extension (in months) | Six Months Ended June 30, 2025 |  |  |
| --- | --- | --- | --- | --- |
| Commercial and industrial | 7 | — | 7 | 13 |
| Consumer real estate | 96 | 13 | 121 | 13 |

We closely monitor the performance of the loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of the modification efforts. The following tables present an aging analysis since the date of modification for loans to borrowers experiencing financial difficulty that were modified in the last 12 months as of the dates presented:

_June 30, 2026_

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| (dollars in thousands) | Current |  | 30-59 Days Past Due |  | 60-89 Days Past Due |  | 90+ Days Past Due |  | Total |  |
| Commercial real estate | $ | $3,538 | $ | — | $ | — | $ | — | $ | $3,538 |
| Commercial and industrial | 22,372 |  | — |  | — |  | 10,189 |  | 32,561 |  |
| Consumer real estate | 537 |  | — |  | — |  | 135 |  | 672 |  |
| Total | $ | $26,447 | $ | — | $ | — | $ | $10,324 | $ | $36,771 |

| Line item | June 30, 2025 | June 30, 2025 | June 30, 2025 | June 30, 2025 | June 30, 2025 | June 30, 2025 | June 30, 2025 | June 30, 2025 |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| (dollars in thousands) | Current |  | 30-59 Days Past Due |  | 60-89 Days Past Due |  | 90+ Days Past Due |  | Total |  |
| Commercial real estate | $ | $541 | $ | — | $ | — | $ | — | $ | $541 |
| Commercial and industrial | 11,591 |  | — |  | — |  | — |  | 11,591 |  |
| Consumer real estate | 995 |  | 117 |  | 98 |  | 75 |  | 1,285 |  |
| Total | $ | $13,127 | $ | $117 | $ | $98 | $ | $75 | $ | $13,417 |

A payment default is defined as a loan having a payment past due 90 days or more. There were two payment defaults on previously modified loans to borrowers experiencing financial difficulty in the amount of $10.3 million during the three months ended June 30, 2026 and three payment defaults in the amount of $13.7 million during the six months ended June 30, 2026 compared to one payment default in the amount of $0.1 million during the three months ended June 30, 2025 and two payment defaults in the amount of $3.9 million during the six months ended June 30, 2025. Additionally, we had twelve commitments to lend an additional $1.7 million to borrowers experiencing financial difficulty that had a modification during the twelve months ended June 30, 2026 and eleven commitments to lend an additional $0.1 million to borrowers experiencing financial difficulty that had a modification during the same period in 2025.

The effect of modifications made to borrowers experiencing financial difficulty is already included in the allowance for credit losses, or ACL, because of the measurement methodologies used to estimate the ACL, therefore, a change to the ACL is generally not recorded upon modification. If principal forgiveness is provided, that portion of the loan will be charged-off, resulting in a reduction of the amortized cost basis and a corresponding adjustment to the ACL. An assessment of whether the borrower is experiencing financial difficulty is made on the date of a modification.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

#### Allowance for Credit Losses

We maintain an ACL, at a level determined to be adequate to absorb estimated expected credit losses within the loan portfolio over the contractual life of an instrument that considers our historical loss experience, current conditions and forecasts of future economic conditions as of the balance sheet date. We develop and document a systematic ACL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer.

The following are key risks within each portfolio segment:

CRE—Loans secured by commercial purpose real estate, including both owner-occupied properties and investment properties for various purposes such as hotels, retail, multifamily and health care. Operations of the individual projects and global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and the business prospects of the lessee, if the project is not owner-occupied.

C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often does not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.

Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While these loans are generally confined to the construction period, if there are problems, the project may not be completed, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.

Business Banking—Commercial purpose loans made to small businesses that are standard, non-complex products evaluated through a streamlined credit approval process that has been designed to maximize efficiency while maintaining high credit quality standards that meet small business market customers’ needs. The business banking portfolio is monitored by utilizing a standard and closely managed process focusing on behavioral and performance criteria. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type and business.

Consumer Real Estate—Loans secured by first and second liens such as 1-4 family residential mortgages, home equity loans and home equity lines of credit. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.

Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines of credit. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.

Management monitors various credit quality indicators for the commercial, business banking and consumer loan portfolios, including changes in risk ratings, nonperforming status and delinquency on a monthly basis.

We monitor the commercial and business banking loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.

Our risk ratings are consistent with regulatory guidance and are as follows:

Pass—The loan is currently performing and is of high quality.

Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.

Doubtful—Loans classified doubtful have all the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently known facts, conditions and values, highly questionable and improbable.The following tables present loan balances by year of origination and internally 

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

assigned risk rating for our portfolio segments at the dates presented:

_June 30, 2026_

|  |  |  |
| --- | --- | --- |
|  | Risk Rating by Year of Origination |  |
| (dollars in thousands) | Revolving | Total |
| Commercial Real Estate |  |  |
| Pass | $$$$$$$36,559 | $$2,697,604 |
| Special mention | 1,330 | 64,134 |
| Substandard | — | 22,580 |
| Doubtful | — | — |
| Total Commercial Real Estate | 37,889 | 2,784,318 |
| Year-to-date Gross Charge-offs | — | — |
| Commercial and Industrial |  |  |
| Pass | 477,506 | 1,292,458 |
| Special mention | 43,502 | 70,610 |
| Substandard | 19,504 | 42,545 |
| Doubtful | 2,421 | 2,421 |
| Total Commercial and Industrial | 542,933 | 1,408,034 |
| Year-to-date Gross Charge-offs | 555 | 753 |
| Commercial Construction |  |  |
| Pass | 8,337 | 466,210 |
| Special mention | — | — |
| Substandard | — | — |
| Doubtful | — | — |
| Total Commercial Construction | 8,337 | 466,210 |
| Year-to-date Gross Charge-offs | — | 69 |
| Business Banking |  |  |
| Pass | 92,927 | 1,263,560 |
| Special mention | 242 | 8,130 |
| Substandard | 67 | 17,443 |
| Doubtful | — | — |
| Total Business Banking | 93,236 | 1,289,133 |
| Year-to-date Gross Charge-offs | 10 | 817 |
| Consumer Real Estate |  |  |
| Pass | 639,579 | 2,016,287 |
| Special mention | — | 76 |
| Substandard | 1,730 | 14,242 |
| Doubtful | — | — |
| Total Consumer Real Estate | 641,309 | 2,030,605 |
| Year-to-date Gross Charge-offs | 45 | 502 |
| Other Consumer |  |  |
| Pass | 45,309 | 79,906 |
| Special mention | — | — |
| Substandard | — | 180 |
| Doubtful | — | — |
| Total Other Consumer | 45,309 | 80,086 |
| Year-to-date Gross Charge-offs | — | 1,030 |
| Pass | 1,300,217 | 7,816,025 |
| Special mention | 45,074 | 142,950 |
| Substandard | 21,301 | 96,990 |
| Doubtful | 2,421 | 2,421 |
| Total Loan Balance | $$$$$$$1,369,013 | $$8,058,386 |
| Year-to-date Gross Charge-offs | $$$$$$$610 | $$3,171 |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

_December 31, 2025_

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
|  | Risk Rating by Year of Origination |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| (dollars in thousands) | 2025 |  | 2024 |  | 2023 |  | 2022 |  | 2021 |  | 2020 and Prior |  | Revolving |  | Revolving-Term |  | Total |  |
| Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Pass | $ | $480,967 | $ | $312,777 | $ | $322,165 | $ | $311,087 | $ | $328,936 | $ | $1,047,543 | $ | $42,300 | $ | — | $ | $2,845,775 |
| Special mention | — |  | 2,907 |  | — |  | 6,865 |  | 3,148 |  | 25,805 |  | 254 |  | — |  | 38,979 |  |
| Substandard | — |  | — |  | 3,883 |  | 1,700 |  | 11,642 |  | 19,782 |  | — |  | — |  | 37,007 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Total Commercial Real Estate | 480,967 |  | 315,684 |  | 326,048 |  | 319,652 |  | 343,726 |  | 1,093,130 |  | 42,554 |  | — |  | 2,921,761 |  |
| Year-to-date Gross Charge-offs | — |  | — |  | — |  | 4,907 |  | — |  | 2,432 |  | — |  | — |  | 7,339 |  |
| Commercial and Industrial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Pass | 161,634 |  | 95,715 |  | 111,222 |  | 138,390 |  | 75,406 |  | 165,633 |  | 501,472 |  | — |  | 1,249,472 |  |
| Special mention | — |  | 350 |  | 2,423 |  | 1,394 |  | 3 |  | 13,611 |  | 8,179 |  | — |  | 25,960 |  |
| Substandard | — |  | — |  | 1,914 |  | — |  | 18,152 |  | 5,644 |  | 27,853 |  | — |  | 53,563 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | 1,610 |  | — |  | 1,610 |  |
| Total Commercial and Industrial | 161,634 |  | 96,065 |  | 115,559 |  | 139,784 |  | 93,561 |  | 184,888 |  | 539,114 |  | — |  | 1,330,605 |  |
| Year-to-date Gross Charge-offs | 256 |  | — |  | 4,014 |  | 172 |  | — |  | 2,089 |  | 192 |  | — |  | 6,723 |  |
| Commercial Construction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Pass | 172,822 |  | 118,952 |  | 43,093 |  | 18,762 |  | 2,520 |  | 1,260 |  | 7,099 |  | — |  | 364,508 |  |
| Special mention | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Substandard | — |  | 869 |  | — |  | — |  | — |  | — |  | — |  | — |  | 869 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Total Commercial Construction | 172,822 |  | 119,821 |  | 43,093 |  | 18,762 |  | 2,520 |  | 1,260 |  | 7,099 |  | — |  | 365,377 |  |
| Year-to-date Gross Charge-offs | — |  | — |  | — |  | 118 |  | — |  | — |  | — |  | — |  | 118 |  |
| Business Banking |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Pass | 182,401 |  | 132,196 |  | 201,106 |  | 197,145 |  | 157,792 |  | 328,135 |  | 93,701 |  | 453 |  | 1,292,929 |  |
| Special mention | — |  | 394 |  | — |  | 427 |  | 137 |  | 2,871 |  | 4 |  | 161 |  | 3,994 |  |
| Substandard | — |  | — |  | 5,175 |  | 2,208 |  | 3,364 |  | 7,574 |  | 151 |  | 468 |  | 18,940 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Total Business Banking | 182,401 |  | 132,590 |  | 206,281 |  | 199,780 |  | 161,293 |  | 338,580 |  | 93,856 |  | 1,082 |  | 1,315,863 |  |
| Year-to-date Gross Charge-offs | — |  | 19 |  | 132 |  | 39 |  | 225 |  | 699 |  | — |  | — |  | 1,114 |  |
| Consumer Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Pass | 161,896 |  | 220,705 |  | 297,533 |  | 306,440 |  | 119,775 |  | 277,507 |  | 618,767 |  | 29,868 |  | 2,032,491 |  |
| Special mention | — |  | — |  | — |  | — |  | — |  | 84 |  | — |  | — |  | 84 |  |
| Substandard | — |  | 583 |  | 2,927 |  | 522 |  | 186 |  | 4,399 |  | 2,006 |  | 3,873 |  | 14,496 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Total Consumer Real Estate | 161,896 |  | 221,288 |  | 300,460 |  | 306,962 |  | 119,961 |  | 281,990 |  | 620,773 |  | 33,741 |  | 2,047,071 |  |
| Year-to-date Gross Charge-offs | 5 |  | 35 |  | 134 |  | 2 |  | — |  | 156 |  | 31 |  | 465 |  | 828 |  |
| Other Consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Pass | 7,016 |  | 5,253 |  | 3,919 |  | 3,869 |  | 1,090 |  | 984 |  | 59,304 |  | 9,640 |  | 91,075 |  |
| Special mention | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Substandard | — |  | — |  | 13 |  | — |  | 10 |  | 143 |  | — |  | 39 |  | 205 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  |
| Total Other Consumer | 7,016 |  | 5,253 |  | 3,932 |  | 3,869 |  | 1,100 |  | 1,127 |  | 59,304 |  | 9,679 |  | 91,280 |  |
| Year-to-date Gross Charge-offs | 1,027 |  | 35 |  | 36 |  | 73 |  | 30 |  | 58 |  | 1 |  | 693 |  | 1,953 |  |
| Pass | 1,166,736 |  | 885,598 |  | 979,038 |  | 975,693 |  | 685,519 |  | 1,821,062 |  | 1,322,643 |  | 39,961 |  | 7,876,250 |  |
| Special mention | — |  | 3,651 |  | 2,423 |  | 8,686 |  | 3,288 |  | 42,371 |  | 8,437 |  | 161 |  | 69,017 |  |
| Substandard | — |  | 1,452 |  | 13,912 |  | 4,430 |  | 33,354 |  | 37,542 |  | 30,010 |  | 4,380 |  | 125,080 |  |
| Doubtful | — |  | — |  | — |  | — |  | — |  | — |  | 1,610 |  | — |  | 1,610 |  |
| Total Loan Balance | $ | $1,166,736 | $ | $890,701 | $ | $995,373 | $ | $988,809 | $ | $722,161 | $ | $1,900,975 | $ | $1,362,700 | $ | $44,502 | $ | $8,071,957 |
| Year-to-date Gross Charge-offs | $ | $1,288 | $ | $89 | $ | $4,316 | $ | $5,311 | $ | $255 | $ | $5,434 | $ | $224 | $ | $1,158 | $ | $18,075 |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following tables present the aging analysis of past due loans segregated by class of loans at the dates presented:

| Line item | June 30, 2026 | June 30, 2026 | June 30, 2026 | June 30, 2026 | June 30, 2026 | June 30, 2026 | June 30, 2026 | June 30, 2026 |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| (dollars in thousands) | Current |  | 30-59 DaysPast Due |  | 60-89 DaysPast Due |  | Nonaccrual |  | Total PastDue Loans |  | Total Loans |  |
| Commercial real estate | $ | $2,773,080 | $ | — | $ | $4,301 | $ | $6,937 | $ | $11,238 | $ | $2,784,318 |
| Commercial and industrial | 1,391,791 |  | — |  | — |  | 16,243 |  | 16,243 |  | 1,408,034 |  |
| Commercial construction | 466,210 |  | — |  | — |  | — |  | — |  | 466,210 |  |
| Business banking | 1,281,110 |  | 711 |  | 2,294 |  | 5,018 |  | 8,023 |  | 1,289,133 |  |
| Consumer real estate | 2,013,568 |  | 2,697 |  | 2,462 |  | 11,878 |  | 17,037 |  | 2,030,605 |  |
| Other consumer | 78,900 |  | 1,029 |  | 17 |  | 140 |  | 1,186 |  | 80,086 |  |
| Total | $ | $8,004,659 | $ | $4,437 | $ | $9,074 | $ | $40,216 | $ | $53,727 | $ | $8,058,386 |

| Line item | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 | December 31, 2025 |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| (dollars in thousands) | Current |  | 30-59 DaysPast Due |  | 60-89 DaysPast Due |  | Nonaccrual |  | Total PastDue Loans |  | Total Loans |  |
| Commercial real estate | $ | $2,906,576 | $ | — | $ | — | $ | $15,185 | $ | $15,185 | $ | $2,921,761 |
| Commercial and industrial | 1,305,388 |  | 311 |  | — |  | 24,906 |  | 25,217 |  | 1,330,605 |  |
| Commercial construction | 364,508 |  | — |  | — |  | 869 |  | 869 |  | 365,377 |  |
| Business banking | 1,308,368 |  | 999 |  | 2,920 |  | 3,576 |  | 7,495 |  | 1,315,863 |  |
| Consumer real estate | 2,028,472 |  | 3,281 |  | 4,454 |  | 10,864 |  | 18,599 |  | 2,047,071 |  |
| Other consumer | 90,503 |  | 604 |  | 15 |  | 158 |  | 777 |  | 91,280 |  |
| Total | $ | $8,003,815 | $ | $5,195 | $ | $7,389 | $ | $55,558 | $ | $68,142 | $ | $8,071,957 |

The following tables present loans on nonaccrual status by class of loan for the year-to-date periods presented:

| (dollars in thousands) | June 30, 2026 / Beginning of Period Nonaccrual | June 30, 2026 / End of Period Nonaccrual | June 30, 2026 / Nonaccrual With No Related Allowance | Interest Income Recognizedon Nonaccrual(1) |
| --- | --- | --- | --- | --- |
| Commercial Real Estate | $15,185 | $6,937 | $6,937 | $169 |
| Commercial and industrial | 24,906 | 16,243 | 3,325 | 192 |
| Commercial construction | 869 | — | — | 4 |
| Business banking | 3,576 | 5,018 | 2,281 | 63 |
| Consumer real estate | 10,864 | 11,878 | — | 221 |
| Other consumer | 158 | 140 | — | 1 |
| Total | $55,558 | $40,216 | $12,543 | $650 |

(1) Represents only cash payments received and applied to interest on nonaccrual loans.

| (dollars in thousands) | December 31, 2025 / Beginning of Period Nonaccrual | December 31, 2025 / End of Period Nonaccrual | December 31, 2025 / Nonaccrual With No Related Allowance | Interest Income Recognizedon Nonaccrual(1) |
| --- | --- | --- | --- | --- |
| Commercial real estate | $3,228 | $15,185 | $14,936 | $123 |
| Commercial and industrial | 11,173 | 24,906 | 12,585 | 202 |
| Commercial construction | — | 869 | — | 581 |
| Business banking | 2,988 | 3,576 | — | 198 |
| Consumer real estate | 10,318 | 10,864 | — | 592 |
| Other consumer | 230 | 158 | — | 3 |
| Total | $27,937 | $55,558 | $27,521 | $1,699 |

(1) Represents only cash payments received and applied to interest on nonaccrual loans.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following tables present loans that are individually evaluated and collateral-dependent at the dates presented:

_June 30, 2026_

| (dollars in thousands) | Type of Collateral / Real Estate | Type of Collateral / Business Assets |
| --- | --- | --- |
| Commercial real estate | $6,937 | — |
| Commercial and industrial | — | 13,761 |
| Business banking | 2,281 | — |
| Total | $9,218 | $13,761 |

_December 31, 2025_

| (dollars in thousands) | Type of Collateral / Real Estate | Type of Collateral / Business Assets |
| --- | --- | --- |
| Commercial real estate | $14,936 | — |
| Commercial and industrial | — | 24,835 |
| Total | $14,936 | $24,835 |

The following tables present activity in the ACL for the periods presented:

_Three Months Ended June 30, 2026_

| (dollars in thousands) | Commercial Real Estate | Commercial and Industrial | Commercial Construction | Business Banking | Consumer Real Estate | Other Consumer | Total Loans |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Allowance for credit losses on loans: |  |  |  |  |  |  |  |
| Balance at beginning of period | $28,385 | $30,693 | $4,653 | $10,919 | $16,181 | $2,440 | $93,271 |
| Provision for credit losses on loans(1) | 190 | 722 | 715 | (120) | (84) | (379) | 1,044 |
| Charge-offs | — | (555) | (69) | (263) | (201) | (148) | (1,236) |
| Recoveries | 2 | 34 | — | 91 | 69 | 45 | 241 |
| Net (Charge-offs) Recoveries | 2 | (521) | (69) | (172) | (132) | (103) | (995) |
| Balance at End of Period | $28,577 | $30,894 | $5,299 | $10,627 | $15,965 | $1,958 | $93,320 |
| (1) Excludes the provision for credit losses for unfunded commitments. |  |  |  |  |  |  |  |

_Three Months Ended June 30, 2025_

| (dollars in thousands) | Commercial Real Estate | Commercial and Industrial | Commercial Construction | Business Banking | Consumer Real Estate | Other Consumer | Total Loans |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Allowance for credit losses on loans: |  |  |  |  |  |  |  |
| Balance at beginning of period | $29,895 | $33,414 | $5,880 | $11,213 | $15,907 | $2,701 | $99,010 |
| Provision for credit losses on loans(1) | 438 | (1,157) | 677 | 387 | (206) | 589 | 728 |
| Charge-offs | — | (256) | (89) | (179) | (390) | (742) | (1,656) |
| Recoveries | 2 | 79 | — | 40 | 216 | 161 | 498 |
| Net (Charge-offs) Recoveries | 2 | (177) | (89) | (139) | (174) | (581) | (1,158) |
| Balance at End of Period | $30,335 | $32,080 | $6,468 | $11,461 | $15,527 | $2,709 | $98,580 |
| (1) Excludes the provision for credit losses for unfunded commitments. |  |  |  |  |  |  |  |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following tables present activity in the ACL for the periods presented:

_Six Months Ended June 30, 2026_

| (dollars in thousands) | Commercial Real Estate | Commercial and Industrial | Commercial Construction | Business Banking | Consumer Real Estate | Other Consumer | Total Loans |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Allowance for credit losses on loans: |  |  |  |  |  |  |  |
| Balance at beginning of period | $29,357 | $29,142 | $4,400 | $11,335 | $16,297 | $2,647 | $93,178 |
| Provision for credit losses on loans(1) | (784) | 2,406 | 968 | — | 63 | 171 | 2,824 |
| Charge-offs | — | (753) | (69) | (817) | (502) | (1,030) | (3,171) |
| Recoveries | 4 | 99 | — | 109 | 107 | 170 | 489 |
| Net (Charge-offs) Recoveries | 4 | (654) | (69) | (708) | (395) | (860) | (2,682) |
| Balance at End of Period | $28,577 | $30,894 | $5,299 | $10,627 | $15,965 | $1,958 | $93,320 |
| (1) Excludes the provision for credit losses for unfunded commitments. |  |  |  |  |  |  |  |

_Six Months Ended June 30, 2025_

| (dollars in thousands) | Commercial Real Estate | Commercial and Industrial | Commercial Construction | Business Banking | Consumer Real Estate | Other Consumer | Total Loans |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Allowance for credit losses on loans: |  |  |  |  |  |  |  |
| Balance at beginning of period | $30,254 | $37,084 | $4,893 | $10,681 | $15,776 | $2,806 | $101,494 |
| Provision for credit losses on loans(1) | (54) | (4,800) | 1,694 | 1,037 | (47) | 387 | (1,783) |
| Charge-offs | — | (428) | (119) | (322) | (552) | (1,119) | (2,540) |
| Recoveries | 135 | 224 | — | 65 | 350 | 635 | 1,409 |
| Net (Charge-offs) Recoveries | 135 | (204) | (119) | (257) | (202) | (484) | (1,131) |
| Balance at End of Period | $30,335 | $32,080 | $6,468 | $11,461 | $15,527 | $2,709 | $98,580 |
| (1) Excludes the provision for credit losses for unfunded commitments. |  |  |  |  |  |  |  |

### NOTE 6. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES

#### Derivatives Designated as Hedging Instruments

The following table indicates the amounts representing the value of derivative assets and derivative liabilities at the dates presented:

| (dollars in thousands) | Derivative Assets(Included in Other Assets) / June 30, 2026 / Notional Amount | Derivative Assets(Included in Other Assets) / June 30, 2026 / Fair Value | Derivative Assets(Included in Other Assets) / December 31, 2025 / Notional Amount | Derivative Assets(Included in Other Assets) / December 31, 2025 / Fair Value | Derivative Liabilities(Included in Other Liabilities) / June 30, 2026 / Notional Amount | Derivative Liabilities(Included in Other Liabilities) / June 30, 2026 / Fair Value | Derivative Liabilities(Included in Other Liabilities) / December 31, 2025 / Notional Amount | Derivative Liabilities(Included in Other Liabilities) / December 31, 2025 / Fair Value |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Derivatives Designated as Hedging Instruments |  |  |  |  |  |  |  |  |
| Interest rate swap contracts - cash flow hedges | — | — | — | — | $250,000 | $1,522 | $350,000 | $2,024 |
| Total Derivatives Designated as Hedging Instruments | — | — | — | — | 250,000 | 1,522 | 350,000 | 2,024 |
| Derivatives Not Designated as Hedging Instruments |  |  |  |  |  |  |  |  |
| Interest rate swap contracts - commercial loans | 696,501 | 34,965 | 746,445 | 33,669 | 696,501 | 35,194 | 746,445 | 33,990 |
| Interest rate lock commitments - mortgage loans | 3,063 | 91 | 3,218 | 81 | — | — | — | — |
| Total Derivatives Not Designated as Hedging Instruments | 699,564 | 35,056 | 749,663 | 33,750 | 696,501 | 35,194 | 746,445 | 33,990 |
| Total Derivatives | $699,564 | $35,056 | $749,663 | $33,750 | $946,501 | $36,716 | $1,096,445 | $36,014 |

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

The following table indicates the gross amounts of interest rate swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets at the dates presented:

| (dollars in thousands) | Derivative Assets(Included in Other Assets) / June 30, 2026 | Derivative Assets(Included in Other Assets) / December 31, 2025 | Derivative Liabilities(Included in Other Liabilities) / June 30, 2026 | Derivative Liabilities(Included in Other Liabilities) / December 31, 2025 |
| --- | --- | --- | --- | --- |
| Gross amounts recognized | $34,965 | $33,669 | $36,716 | $36,014 |
| Gross amounts offset | — | — | — | — |
| Net amounts presented in the Consolidated Balance Sheets | 34,965 | 33,669 | 36,716 | 36,014 |
| Netting adjustments(1) | (1,522) | (2,024) | (1,522) | (2,024) |
| Cash collateral(2) | (31,837) | (26,964) | — | 2 |
| Net Amount | $1,606 | $4,681 | $35,194 | $33,992 |
| (1) Netting adjustments represent the amounts recorded to convert derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. |  |  |  |  |
| (2) Cash collateral represents the amount that cannot be used to offset our derivative assets and liabilities from a gross basis to a net basis in accordance with the applicable accounting guidance. The application of the cash collateral cannot reduce the net derivative position below zero. Therefore, excess cash collateral, if any, is not reflected above. |  |  |  |  |

**The following table presents the effect, net of tax, of the cash flow hedges on OCI and on the Consolidated Statements of Comprehensive Income for the periods presented:**

| (dollars in thousands) | Amount of Gain Recognized in Other Comprehensive Income / Three months ended June 30, 2026 | Amount of Gain Recognized in Other Comprehensive Income / Three months ended June 30, 2025 | Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Income / Three months ended June 30, 2026 | Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Income / Three months ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Derivatives in Cash Flow Hedging Relationships: |  |  |  |  |
| Interest rate swap contracts - cash flow hedge | $271 | $1,404 | $(489) | $(1,520) |
| Total | $271 | $1,404 | $(489) | $(1,520) |
|  | Amount of Gain Recognized in Other Comprehensive Income |  | Amount of Loss Reclassified from Accumulated Other Comprehensive Loss into Interest Income |  |
| (dollars in thousands) | Six months ended June 30, 2026 | Six months ended June 30, 2025 | Six months ended June 30, 2026 | Six months ended June 30, 2025 |
| Derivatives in Cash Flow Hedging Relationships: |  |  |  |  |
| Interest rate swap contracts - cash flow hedges | $394 | $3,850 | $(1,141) | $(3,211) |
| Total | $394 | $3,850 | $(1,141) | $(3,211) |

Amounts reported in OCI related to derivatives that are designated as hedging instruments are reclassified to interest income as interest payments are received on variable rate assets. We estimate that an additional $1.5 million will be reclassified as a decrease to interest income in the next 12 months. Our current interest rate swap agreements have three to five year terms with maturity dates extending into 2027.

The following table indicates the gain (loss) recognized in income on derivatives not designated as hedging instruments for the periods presented:

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Derivatives not Designated as Hedging Instruments |  |  |  |  |
| Interest rate swap contracts—commercial loans | $(3) | $46 | $37 | $94 |
| Interest rate lock commitments—mortgage loans | 57 | — | 10 | — |
| Total Derivatives Gain (Loss) | $54 | $46 | $47 | $94 |

### NOTE 7. TAX CREDIT EQUITY INVESTMENTS

We invest in low income housing tax credit, or LIHTC, and historic tax credit, or HTC, partnerships as part of our responsibilities under the Community Reinvestment Act and due to their favorable federal income tax benefits. As a limited

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. No impairment losses were recognized for the three and six months ended June 30, 2026 and 2025.

The following table presents the balances included in the Consolidated Balance Sheets at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Tax credit equity investment(1) | $33,405 | $35,782 |
| Unfunded commitments(2) | 3,150 | 3,514 |
| (1) Included in other assets in the Consolidated Balance Sheets |  |  |
| (2) Included in other liabilities in the Consolidated Balance Sheets |  |  |

The following table summarizes the amortization expense and tax credits included in income tax expense in the Condensed Consolidated Statements of Comprehensive Income for the periods presented:

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 |
| --- | --- | --- |
| Tax credits and other tax benefits recognized | $1,493 | $1,388 |
| Amortization | 1,189 | 1,231 |
| Net benefit included in income tax expense | $304 | $157 |
|  | Six Months Ended June 30, |  |
| (dollars in thousands) | 2026 | 2025 |
| Tax credits and other tax benefits recognized | $2,986 | $2,776 |
| Amortization | 2,377 | 2,462 |
| Net benefit included in income tax expense | $609 | $314 |

### NOTE 8. COMMITMENTS AND CONTINGENCIES

#### Commitments

In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated financial statements. Our exposure to credit loss, in the event the customer does not satisfy the terms of the agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Because many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.

The following table sets forth our commitments and letters of credit at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Commitments to extend credit | $2,623,228 | $2,644,139 |
| Standby letters of credit | 66,532 | 67,452 |
| Total | $2,689,760 | $2,711,591 |

#### Litigation

In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims pending will not have a material adverse effect on our consolidated financial position or results of operations.

#### S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

### NOTE 9. OTHER COMPREHENSIVE INCOME (LOSS)

The following table presents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects:

| (dollars in thousands) | Three Months Ended June 30, 2026 / Pre-Tax Amount | Three Months Ended June 30, 2026 / Tax Benefit (Expense) | Three Months Ended June 30, 2026 / Net of Tax Amount | Three Months Ended June 30, 2025 / Pre-Tax Amount | Three Months Ended June 30, 2025 / Tax Expense | Three Months Ended June 30, 2025 / Net of Tax Amount |
| --- | --- | --- | --- | --- | --- | --- |
| Change in net unrealized gains (losses) on available-for-sale debt securities | $(4,774) | $1,027 | $(3,747) | $8,296 | $(1,770) | $6,526 |
| Net available-for-sale securities losses reclassified into earnings | 1,716 | (369) | 1,347 | — | — | — |
| Change in interest rate swap | 345 | (74) | 271 | 1,786 | (382) | 1,404 |
| Adjustment to funded status of employee benefit plans | 332 | (72) | 260 | 379 | (76) | 303 |
| Other Comprehensive (Loss) Income | $(2,381) | $512 | $(1,869) | $10,461 | $(2,228) | $8,233 |
|  | Six Months Ended June 30, 2026 |  |  | Six Months Ended June 30, 2025 |  |  |
| (dollars in thousands) | Pre-TaxAmount | Tax Benefit (Expense) | Net of TaxAmount | Pre-TaxAmount | Tax Expense | Net of TaxAmount |
| Change in net unrealized (losses) gains on available-for-sale debt securities | $(12,614) | $2,715 | $(9,899) | $23,343 | $(5,007) | $18,336 |
| Net available-for-sale securities losses reclassified into earnings | 1,716 | (369) | 1,347 | 2,295 | (493) | 1,802 |
| Change in interest rate swap | 502 | (108) | 394 | 4,903 | (1,053) | 3,850 |
| Adjustment to funded status of employee benefit plans | 663 | (143) | 520 | 760 | (158) | 602 |
| Other Comprehensive (Loss) Income | $(9,733) | $2,095 | $(7,638) | $31,301 | $(6,711) | $24,590 |

### NOTE 10. SHARE REPURCHASE PLAN

On January 21, 2026, the Board of Directors of S&T Bancorp, Inc. authorized a $100.0 million share repurchase program. The repurchase authorization permitted S&T to repurchase shares of S&T's common stock from time to time through a combination of open market and privately negotiated repurchases up to the authorized $100.0 million aggregate value of S&T's common stock. At June 30, 2026, there was $2.8 million in capacity remaining under the plan.

The following table presents common stock repurchase activity for the periods presented:

| (in thousands, except share and per share data) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Value of shares authorized to repurchase | $100,000 | $50,000 | $100,000 | $50,000 |
| Remaining plan capacity at the beginning of the period | $50,379 | — | $100,000 | — |
| Total shares repurchased | 1,074,924 | — | 2,221,024 | — |
| Average share price for the period | $44.24 | — | $43.75 | — |
| Total share cost of repurchases(1) | $47,557 | — | $97,178 | — |
| Remaining plan capacity at the end of the period | $2,822 | $50,000 | $2,822 | $50,000 |
| (1)Excludes excise tax and commissions |  |  |  |  |

### NOTE 11. SUBSEQUENT EVENTS

On July 22, 2026, the Board of Directors of S&T Bancorp, Inc. authorized a new share repurchase program. The new program replaced the existing share repurchase program effective July 27, 2026, and is set to expire August 31, 2027. The remaining capacity of $2.8 million under the existing share repurchase program was terminated. The new program authorizes the share repurchase of S&T's common stock from time to time through a combination of open market and privately negotiated transactions up to the authorized $100 million aggregate value of S&T's common stock. The specific timing, price and quantity of repurchases will be at the discretion of S&T and will depend on a variety of factors, including general market conditions, the trading price of the common stock, applicable securities laws and other legal and contractual requirements, as well as S&T’s financial performance. The repurchase program does not obligate S&T to repurchase any particular number of shares and may be extended, modified or discontinued at any time.

## Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Management’s Discussion and Analysis of Financial Condition and Results of Operations, or MD&A, represents an overview of our consolidated results of operations and financial condition and highlights material changes in our financial condition and results of operations for the three and six months ended June 30, 2026 and 2025. Our MD&A should be read in conjunction with our Condensed Consolidated Financial Statements and Notes. The results of operations reported in the accompanying Condensed Consolidated Financial Statements are not necessarily indicative of results to be expected in future periods.

### Important Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains or incorporates statements that we believe are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements generally relate to our financial condition, results of operations, plans, objectives, outlook for earnings, revenues, expenses, capital and liquidity levels and ratios, asset levels, asset quality, financial position and other matters regarding or affecting S&T and its future business and operations. Forward-looking statements are typically identified by words or phrases such as “will likely result,” “expect,” “anticipate,” “estimate,” “forecast,” “project,” “intend,” “believe,” “assume,” “strategy,” “trend,” “plan,” “outlook,” “outcome,” “continue,” “remain,” “potential,” “opportunity,” “comfortable,” “current,” “position,” “maintain,” “sustain,” “seek,” “achieve” and variations of such words and similar expressions, or future or conditional verbs such as “will,” “would,” “should,” “could” or “may.” Although we believe the assumptions upon which these forward-looking statements are based are reasonable, any of these assumptions could prove to be inaccurate and the forward-looking statements based on these assumptions could be incorrect. The matters discussed in these forward-looking statements are subject to various risks, uncertainties and other factors that could cause actual results and trends to differ materially from those made, projected or implied in or by the forward-looking statements depending on a variety of uncertainties or other factors including, but not limited to: credit losses and the credit risk of our commercial and consumer loan products; changes in the level of charge-offs and changes in estimates of the adequacy of the allowance for credit losses, or ACL; cybersecurity concerns; rapid technological developments and changes, including the use of artificial intelligence and digital assets; operational risks or risk management failures by us or critical third parties, including fraud risk; our ability to manage our brand risks; sensitivity to the interest rate environment, a rapid increase in interest rates or a change in the shape of the yield curve; a change in spreads on interest-earning assets and interest-bearing liabilities; regulatory supervision and oversight, including changes in regulatory capital requirements and our ability to address those requirements; unanticipated changes in our liquidity position; unanticipated changes in regulatory and governmental policies impacting interest rates and financial markets; changes in accounting policies, practices or guidance; legislation affecting the financial services industry as a whole, and S&T, in particular; developments affecting the industry and the soundness of financial institutions and further disruption to the economy and U.S. banking system; the outcome of pending and future litigation and governmental proceedings; increasing price and product/service competition; the ability to continue to introduce competitive new products and services on a timely, cost-effective basis; managing our internal growth and acquisitions; the possibility that the anticipated benefits from acquisitions cannot be fully realized in a timely manner or at all, or that integrating the acquired operations will be more difficult, disruptive or costly than anticipated; containing costs and expenses; reliance on significant customer relationships; an interruption or cessation of an important service by a third-party provider; our ability to attract and retain talented executives and other employees; general economic or business conditions, including the strength of regional economic conditions in our market area; ESG practices and disclosures, including climate change, hiring practices, the diversity of the work force and racial and social justice issues; deterioration of the housing market and reduced demand for mortgages; deterioration in the overall macroeconomic conditions or the state of the banking industry that could warrant further analysis of the carrying value of goodwill and could result in an adjustment to its carrying value resulting in a non-cash charge to net income; the stability of our core deposit base and access to contingency funding; re-emergence of turbulence in significant portions of the global financial and real estate markets that could impact our performance, both directly, by affecting our revenues and the value of our assets and liabilities, and indirectly, by affecting the economy generally and access to capital in the amounts, at the times and on the terms required to support our future businesses and geopolitical tensions and conflicts between nations.

Many of these factors, as well as other factors, are described elsewhere in this report, and under Part I, Item 1A - Risk Factors of our 2025 Form 10-K, and any of our subsequent filings with the SEC. Forward-looking statements are based on beliefs and assumptions using information available at the time the statements are made. We caution you not to unduly rely on forward-looking statements because the assumptions, beliefs, expectations and projections about future events may, and often do, differ materially from actual results. Any forward-looking statement speaks only as to the date on which it is made, and we undertake no obligation to update any forward-looking statement to reflect developments occurring after the statement is made.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

### Critical Accounting Policies and Estimates

We view critical accounting policies to be those which are highly dependent on subjective or complex estimates, assumptions and judgments and where changes in those estimates and assumptions could have a significant impact on the Condensed Consolidated Financial Statements. Further, we view critical accounting estimates as those estimates made in accordance with GAAP that involve a significant level of estimation uncertainty and have had or are reasonably likely to have a material impact on our financial condition or results of operations. Our critical accounting policies and estimates as of June 30, 2026 remained unchanged from the disclosures presented in our 2025 Form 10-K under Part II, Item 7 - Management’s Discussion and Analysis of Financial Condition and Results of Operations.

### Explanation of Use of Non-GAAP Financial Measures

In addition to traditional financial measures presented in accordance with GAAP, our management uses, and this report contains or references, certain non-GAAP financial measures, such as interest income on interest-earning assets, net interest income and net interest margin presented on a fully taxable equivalent, or FTE, basis (non-GAAP), the efficiency ratio (non-GAAP) and return on tangible shareholders' equity (non-GAAP).

We believe these non-GAAP financial measures provide information useful to investors in understanding our underlying business, operational performance and performance trends as they facilitate comparisons with the performance of other companies in the financial services industry. Although we believe that these non-GAAP financial measures enhance investors’ understanding of our business and performance, these non-GAAP financial measures should not be considered alternatives to GAAP or considered to be more important than financial results determined in accordance with GAAP, nor are they necessarily comparable with non-GAAP measures which may be presented by other companies.

The following table reconciles interest and dividend income and net interest income per the Condensed Consolidated Statements of Comprehensive Income to interest income, net interest income and net interest margin on an FTE basis (non-GAAP) for the periods presented. The FTE basis (non-GAAP) adjusts for the tax benefit of income on certain tax-exempt loans and securities and the dividend-received deduction for equity securities using the federal statutory tax rate of 21 percent for each period. We believe this to be the preferred industry measurement of net interest income that provides a relevant comparison combining both taxable and non-taxable sources of interest income.

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Total Interest and Dividend Income | $128,059 | $128,906 | $254,392 | $253,754 |
| Plus: taxable equivalent adjustment | 584 | 590 | 1,174 | 1,208 |
| Interest and Dividend Income on an FTE Basis (Non-GAAP) | $128,643 | $129,496 | $255,566 | $254,962 |
| Total Interest and Dividend Income | $128,059 | $128,906 | $254,392 | $253,754 |
| Less: Interest expense | (37,679) | (42,334) | (75,576) | (83,859) |
| Net Interest Income | 90,380 | 86,572 | 178,816 | 169,895 |
| Plus: taxable equivalent adjustment | 584 | 590 | 1,174 | 1,208 |
| Net Interest Income on an FTE Basis (Non-GAAP) | $90,964 | $87,162 | $179,990 | $171,103 |
| Net interest margin | 3.96% | 3.85% | 3.92% | 3.82% |
| Plus: taxable equivalent adjustment | 0.03% | 0.03% | 0.03% | 0.02% |
| Net Interest Margin on an FTE Basis (Non-GAAP) | 3.99% | 3.88% | 3.95% | 3.84% |

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Return on average tangible shareholders' equity (non-GAAP) is a key profitability metric used by management to measure financial performance. The following table provides a reconciliation of return on average tangible shareholders' equity (non-GAAP) by reconciling net income (GAAP) per the Condensed Consolidated Statements of Comprehensive Income to net income before amortization of intangibles and average shareholders' equity to average tangible shareholders' equity for the periods presented:

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Net income (annualized) | $146,975 | $127,951 | $144,619 | $131,684 |
| Plus: amortization of intangibles (annualized) net of tax | 577 | 653 | 580 | 712 |
| Net income before amortization of intangibles (non-GAAP) (annualized) | $147,552 | $128,604 | $145,199 | $132,396 |
| Average shareholders' equity | $1,417,865 | $1,436,288 | $1,436,669 | $1,418,741 |
| Less: average goodwill and other intangible assets, net of deferred tax liability | (374,991) | (375,572) | (375,063) | (375,656) |
| Average tangible shareholders' equity (non-GAAP) | $1,042,874 | $1,060,716 | $1,061,606 | $1,043,085 |
| Return on Average Tangible Shareholders' Equity (non-GAAP) | 14.15% | 12.12% | 13.68% | 12.69% |

### Executive Overview

We are a bank holding company that is headquartered in Indiana, Pennsylvania with assets of $9.9 billion at June 30, 2026. We operate in Pennsylvania and Ohio providing a full range of financial services with retail, business banking and commercial banking products and trust and brokerage services. Our common stock trades on the Nasdaq Global Select Market under the symbol “STBA.”

We earn revenue primarily from interest on loans and securities and fees charged for financial services provided to our customers. We incur expenses for the cost of deposits and other funding sources, provision for credit losses and other operating costs such as salaries and employee benefits, data processing, occupancy and tax expense.

Our purpose is building our future together through people-forward banking. We believe that all banking should be personal. We cultivate relationships rooted in trust, strengthened by going above and beyond and renewed with every interaction. Our strategic priorities for 2026 and beyond will be focused on growing our deposit franchise, improving core profitability, maintaining asset quality and ensuring a high level of talent and engagement.

### Earnings Summary

The following table presents a summary of key profitability metrics for the periods presented:

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Net income | $36,643 | $31,900 | $71,715 | $65,301 |
| Earnings per share - diluted | $1.02 | $0.83 | $1.96 | $1.69 |
| Return on average assets | 1.49% | 1.32% | 1.47% | 1.36% |
| Return on average shareholders' equity | 10.37% | 8.91% | 10.07% | 9.28% |
| Return on average tangible shareholders' equity (non-GAAP)(1) | 14.15% | 12.12% | 13.68% | 12.69% |
| (1) Reconciled to GAAP in the Explanation of Use of Non-GAAP Financial Measures section of this MD&A. |  |  |  |  |

We recognized net income of $36.6 million, or $1.02 per diluted share, for the three months ended June 30, 2026 compared to net income of $31.9 million, or $0.83 per diluted share, for the same period in 2025. This represents a 14.9 percent increase in net income and a 22.9 percent increase in diluted earnings per share for the three months ended June 30, 2026 compared to the same period in 2025. We recognized net income of $71.7 million, or $1.96 per diluted share, for the six months ended June 30, 2026 compared to net income of $65.3 million, or $1.69 per diluted share, for the same period in 2025. This represents a 9.8 percent increase in net income and a 16.0 percent increase in diluted earnings per share for the six months ended June 30, 2026 compared to the same period in 2025.

During the three months ended June 30, 2026, 1,074,924 shares were repurchased at an average price of $44.24 per share for $47.6 million excluding excise tax and commissions. During the six months ended June 30, 2026, 2,221,024 common shares were repurchased at an average price of $43.75 per share for $97.2 million excluding excise tax and commissions.

Net interest income increased $3.8 million, or 4.4 percent, and $8.9 million, or 5.3 percent, for the three and six months ended June 30, 2026 compared to the same periods in 2025. Net interest margin, or NIM, on an FTE basis (non-GAAP)

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

increased 11 basis points for both the three and six months ended June 30, 2026 compared to the same periods in 2025. The increases in both net interest income and NIM on an FTE basis (non-GAAP) were primarily due to the impact of lower interest rates on interest bearing liabilities and an improvement in our overall funding mix.

The provision for credit losses decreased $0.9 million to $1.1 million for the three months ended June 30, 2026 compared to $2.0 million for the same period in 2025. The decrease was primarily related to a lower provision for unfunded loan commitments due to lower loss rates. The provision for credit losses increased $3.5 million to $2.4 million for the six months ended June 30, 2026 compared to negative $1.1 million for the same periods in 2025. The increase was related to higher net loan charge-offs and specific reserves for loans individually evaluated compared to the same period in 2025, which was partially offset by decreases in the reserve for unfunded loan commitments due to lower loss rates.

Noninterest income increased $1.4 million and $4.6 million for the three and six months ended June 30, 2026 compared to the same periods in 2025. The most significant increase for the six months ended June 30, 2026 is due to a $0.2 million net gain on the sale of securities compared to a $2.3 million loss on sale of securities that occurred in 2025.

Noninterest expense increased $0.6 million and $2.2 million for the three and six months ended June 30, 2026 compared to the same periods in 2025. The increase for the three months ended June 30, 2026 was primarily due to normal fluctuations across several expense categories and timing-related items. The increase for the six months ended June 30, 2026 was primarily due to an increase in salaries and employee benefits driven by annual merit increases and the acquisition of new talent.

Our effective tax rate was 19.4 percent and 19.9 percent for the three and six months ended June 30, 2026 compared to 20.2 percent and 20.1 percent for the three and six months ended June 30, 2025. The decrease in the effective tax rate for the three and six months ended June 30, 2026 was primarily due to an increase in tax credits and losses on low-income housing and historic partnership investments compared to the same periods in 2025.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Three and six months ended June 30, 2026 compared to    Three and six months ended June 30, 2025

### Net Interest Income

Our principal source of revenue is net interest income. Net interest income represents the difference between the interest and fees earned on interest-earning assets and the interest paid on interest-bearing liabilities. Net interest income is affected by changes in the average balance of interest-earning assets and interest-bearing liabilities and changes in interest rates and spreads. The level and mix of interest-earning assets and interest-bearing liabilities is managed by our Asset and Liability Committee, or ALCO, in order to mitigate interest rate and liquidity risks of the balance sheet. A variety of ALCO strategies were implemented, within prescribed ALCO risk parameters, to produce what we believe is an acceptable level of net interest income.

### Average Balance Sheet and Net Interest Income Analysis (FTE) (non-GAAP)

The following tables provide information regarding the average balances, interest and rates earned on interest-earning assets and interest and rates paid on interest-bearing liabilities for the periods presented:

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

| (dollars in thousands) | Three Months Ended June 30, 2026 / Average Balance | Three Months Ended June 30, 2026 / Interest | Three Months Ended June 30, 2026 / Rate | Three Months Ended June 30, 2025 / Average Balance | Three Months Ended June 30, 2025 / Interest | Three Months Ended June 30, 2025 / Rate |
| --- | --- | --- | --- | --- | --- | --- |
| ASSETS |  |  |  |  |  |  |
| Interest-bearing deposits with banks | $127,429 | $1,174 | 3.69% | $120,156 | $1,335 | 4.46% |
| Securities, at fair value(1)(2) | 1,007,484 | 9,648 | 3.83% | 1,011,629 | 9,575 | 3.79% |
| Loans held for sale | 2,034 | 33 | 6.47% | — | — | — |
| Commercial real estate | 3,503,981 | 51,500 | 5.90% | 3,477,321 | 50,951 | 5.88% |
| Commercial and industrial | 1,555,118 | 23,958 | 6.18% | 1,519,133 | 25,408 | 6.71% |
| Commercial construction | 433,427 | 6,921 | 6.40% | 382,363 | 6,614 | 6.94% |
| Total Commercial Loans | 5,492,526 | 82,379 | 6.02% | 5,378,817 | 82,973 | 6.19% |
| Residential mortgage | 1,672,326 | 22,522 | 5.39% | 1,674,231 | 21,993 | 5.26% |
| Home equity | 720,484 | 10,620 | 5.91% | 670,066 | 10,648 | 6.37% |
| Installment and other consumer | 82,452 | 1,527 | 7.43% | 99,550 | 1,956 | 7.88% |
| Consumer construction | 27,370 | 451 | 6.61% | 41,025 | 698 | 6.82% |
| Total Consumer Loans | 2,502,632 | 35,120 | 5.62% | 2,484,872 | 35,295 | 5.69% |
| Total Portfolio Loans | 7,995,158 | 117,499 | 5.89% | 7,863,689 | 118,268 | 6.03% |
| Total Loans(1)(3) | 7,997,192 | 117,532 | 5.89% | 7,863,689 | 118,268 | 6.03% |
| Total other earning assets | 13,772 | 289 | 8.40% | 16,537 | 318 | 7.70% |
| Total Interest-earning Assets | 9,145,877 | $128,643 | 5.64% | 9,012,011 | $129,496 | 5.76% |
| Noninterest-earning assets | 694,086 |  |  | 712,891 |  |  |
| Total Assets | $9,839,963 |  |  | $9,724,902 |  |  |
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |
| Interest-bearing demand | $777,216 | $1,816 | 0.94% | $763,687 | $1,919 | 1.01% |
| Money market | 2,185,936 | 14,021 | 2.57% | 2,188,771 | 16,598 | 3.04% |
| Savings | 879,391 | 1,474 | 0.67% | 880,448 | 1,517 | 0.69% |
| Certificates of deposit | 1,994,523 | 18,088 | 3.64% | 1,872,329 | 19,022 | 4.07% |
| Total Interest-bearing Deposits | 5,837,066 | 35,399 | 2.43% | 5,705,235 | 39,056 | 2.75% |
| Short-term borrowings | 106,209 | 1,023 | 3.86% | 135,659 | 1,567 | 4.63% |
| Long-term borrowings | 25,783 | 242 | 3.76% | 50,866 | 482 | 3.80% |
| Junior subordinated debt securities | 49,499 | 799 | 6.47% | 49,439 | 877 | 7.12% |
| Total Borrowings | 181,491 | 2,064 | 4.56% | 235,964 | 2,926 | 4.97% |
| Other interest-bearing liabilities | 23,602 | 216 | 3.69% | 32,202 | 352 | 4.39% |
| Total Interest-bearing Liabilities | 6,042,159 | 37,679 | 2.50% | 5,973,401 | 42,334 | 2.84% |
| Noninterest-bearing liabilities | 2,379,939 |  |  | 2,315,213 |  |  |
| Shareholders' equity | 1,417,865 |  |  | 1,436,288 |  |  |
| Total Liabilities and Shareholders' Equity | $9,839,963 |  |  | $9,724,902 |  |  |
| Net Interest Income (FTE) (non-GAAP)(1)(2) |  | $90,964 |  |  | $87,162 |  |
| Net Interest Margin (FTE) (non-GAAP)(1)(2) |  |  | 3.99% |  |  | 3.88% |

(1) Tax-exempt interest income is on an FTE basis (non-GAAP) using the statutory federal corporate income tax rate of 21 percent.

(2) Taxable investment income is adjusted for the dividend-received deduction for equity securities.

(3) Nonaccruing loans are included in the daily average loan amounts outstanding.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

| (dollars in thousands) | Six Months Ended June 30, 2026 / Average Balance | Six Months Ended June 30, 2026 / Interest | Six Months Ended June 30, 2026 / Rate | Six Months Ended June 30, 2025 / Average Balance | Six Months Ended June 30, 2025 / Interest | Six Months Ended June 30, 2025 / Rate |
| --- | --- | --- | --- | --- | --- | --- |
| ASSETS |  |  |  |  |  |  |
| Interest-bearing deposits with banks | $140,341 | $2,572 | 3.70% | $124,423 | $2,751 | 4.46% |
| Securities, at fair value(1)(2) | 1,002,289 | 19,073 | 3.81% | 1,001,080 | 18,450 | 3.69% |
| Loans held for sale | 1,521 | 49 | 6.49% | — | — | — |
| Commercial real estate | 3,541,732 | 102,734 | 5.85% | 3,436,686 | 99,691 | 5.85% |
| Commercial and industrial | 1,534,452 | 47,277 | 6.21% | 1,527,139 | 50,727 | 6.70% |
| Commercial construction | 410,547 | 13,055 | 6.41% | 378,643 | 13,037 | 6.94% |
| Total Commercial Loans | 5,486,731 | 163,066 | 5.99% | 5,342,468 | 163,455 | 6.17% |
| Residential mortgage | 1,686,930 | 45,303 | 5.38% | 1,667,242 | 43,538 | 5.23% |
| Home equity | 714,205 | 20,913 | 5.90% | 661,636 | 20,796 | 6.34% |
| Installment and other consumer | 85,058 | 3,125 | 7.41% | 99,476 | 3,910 | 7.93% |
| Consumer construction | 28,739 | 949 | 6.66% | 43,080 | 1,461 | 6.84% |
| Total Consumer Loans | 2,514,932 | 70,290 | 5.61% | 2,471,434 | 69,705 | 5.67% |
| Total Portfolio Loans | 8,001,663 | 233,356 | 5.87% | 7,813,902 | 233,160 | 6.01% |
| Total Loans(1)(3) | 8,003,184 | 233,405 | 5.87% | 7,813,902 | 233,160 | 6.01% |
| Total other earning assets | 13,291 | 516 | 7.76% | 16,652 | 601 | 7.21% |
| Total Interest-earning Assets | 9,159,105 | $255,566 | 5.62% | 8,956,057 | $254,962 | 5.73% |
| Noninterest-earning assets | 693,534 |  |  | 719,996 |  |  |
| Total Assets | $9,852,639 |  |  | $9,676,053 |  |  |
| LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |
| Interest-bearing demand | $777,855 | $3,598 | 0.93% | $771,455 | $3,849 | 1.01% |
| Money market | 2,215,763 | 28,429 | 2.59% | 2,138,836 | 31,874 | 3.01% |
| Savings | 876,365 | 2,881 | 0.66% | 882,531 | 2,967 | 0.68% |
| Certificates of deposit | 1,980,244 | 36,177 | 3.68% | 1,866,616 | 38,720 | 4.18% |
| Total Interest-bearing Deposits | 5,850,227 | 71,085 | 2.45% | 5,659,438 | 77,410 | 2.76% |
| Short-term borrowings | 90,274 | 1,754 | 3.92% | 126,740 | 2,910 | 4.63% |
| Long-term borrowings | 38,225 | 718 | 3.79% | 50,876 | 959 | 3.80% |
| Junior subordinated debt securities | 49,492 | 1,595 | 6.50% | 49,431 | 1,752 | 7.15% |
| Total Borrowings | 177,991 | 4,067 | 4.61% | 227,047 | 5,621 | 4.99% |
| Other interest-bearing liabilities | 23,234 | 424 | 3.69% | 38,032 | 828 | 4.39% |
| Total Interest-bearing Liabilities | 6,051,452 | 75,576 | 2.52% | 5,924,517 | 83,859 | 2.85% |
| Noninterest-bearing liabilities | 2,364,518 |  |  | 2,332,795 |  |  |
| Shareholders' equity | 1,436,669 |  |  | 1,418,741 |  |  |
| Total Liabilities and Shareholders' Equity | $9,852,639 |  |  | $9,676,053 |  |  |
| Net Interest Income (FTE) (non-GAAP)(1)(2) |  | $179,990 |  |  | $171,103 |  |
| Net Interest Margin (FTE) (non-GAAP)(1)(2) |  |  | 3.95% |  |  | 3.84% |

(1) Tax-exempt interest income is on an FTE basis (non-GAAP) using the statutory federal corporate income tax rate of 21 percent.

(2) Taxable investment income is adjusted for the dividend-received deduction for equity securities.

(3) Nonaccruing loans are included in the daily average loan amounts outstanding.

Net interest income on an FTE basis (non-GAAP) increased $3.8 million, or 4.4 percent, and $8.9 million, or 5.2 percent, for the three and six months ended June 30, 2026 compared to the same periods in 2025. The net interest margin, or NIM, on an FTE basis (non-GAAP) increased 11 basis points for both the three and six months ended June 30, 2026 compared to the same periods in 2025. These improvements in both net interest income and NIM on an FTE basis (non-GAAP) were primarily due to the impact of lower interest rates on interest-bearing liabilities and an improvement in our overall funding mix. Customer deposit growth in 2025 and 2026 has reduced our levels of wholesale borrowings and brokered deposits.

Interest income on an FTE basis (non-GAAP) decreased $0.9 million for the three months ended June 30, 2026 and increased $0.6 million for the six months ended June 30, 2026 compared to the same periods in 2025. The decrease in interest income on an FTE basis (non-GAAP) for the three months ended June 30, 2026 was primarily driven by lower interest rates. The increase in interest income on an FTE basis (non-GAAP) for the six months ended June 30, 2026 was primarily driven by higher yields in the securities portfolio. The average yield on securities increased 12 basis points for the six months ended

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

June 30, 2026. Average loans increased $189.3 million for the six months ended June 30, 2026 compared to the same period in 2025. The increase in average loans was offset by a decrease in the average yield on loans of 14 basis points for the six months ended June 30, 2026 compared to the same period in 2025 due to lower interest rates. Overall, the FTE rate (non-GAAP) on interest-earning assets decreased 12 and 11 basis points for the three and six months ended June 30, 2026 compared to the same periods in 2025.

Interest expense decreased $4.7 million and $8.3 million for the three and six months ended June 30, 2026 compared to the same periods in 2025. The decrease in interest expense was primarily due to decreased interest rates and lower levels of wholesale funding. Average interest-bearing deposits increased $131.8 million and $190.8 million for the three and six months ended June 30, 2026 compared to the same periods in 2025 primarily due to increases in certificates of deposit balances as well as increases in money market. Average borrowings decreased $54.5 million and $49.1 million for the three and six months ended June 30, 2026 compared to the same periods in 2025 primarily due to an increase in customer deposits. Overall, the cost of interest-bearing liabilities decreased 34 and 33 basis points for the three and six months ended June 30, 2026 compared to the same periods in 2025.

The following table sets forth for the periods presented a summary of the changes in interest earned and interest paid resulting from changes in volume and changes in rates:

| (dollars in thousands) | Three Months Ended June 30, 2026 Compared to June 30, 2025 / Volume (4) | Three Months Ended June 30, 2026 Compared to June 30, 2025 / Rate (4) | Three Months Ended June 30, 2026 Compared to June 30, 2025 / Total | Six Months Ended June 30, 2026 Compared to June 30, 2025 / Volume (4) | Six Months Ended June 30, 2026 Compared to June 30, 2025 / Rate (4) | Six Months Ended June 30, 2026 Compared to June 30, 2025 / Total |
| --- | --- | --- | --- | --- | --- | --- |
| Interest earned on: |  |  |  |  |  |  |
| Interest-bearing deposits with banks | $81 | $(243) | $(162) | $352 | $(531) | $(179) |
| Securities, at fair value(1)(2) | (39) | 112 | 73 | 22 | 601 | 623 |
| Loans held for sale | 33 | — | 33 | 49 | — | 49 |
| Commercial real estate | 391 | 159 | 550 | 3,047 | (4) | 3,043 |
| Commercial and industrial | 602 | (2,052) | (1,450) | 243 | (3,693) | (3,450) |
| Commercial construction | 883 | (577) | 306 | 1,098 | (1,080) | 18 |
| Total Commercial Loans | 1,876 | (2,470) | (594) | 4,388 | (4,777) | (389) |
| Residential mortgage | (25) | 553 | 528 | 514 | 1,252 | 1,766 |
| Home equity | 801 | (829) | (28) | 1,652 | (1,535) | 117 |
| Installment and other consumer | (336) | (93) | (429) | (567) | (218) | (785) |
| Consumer construction | (232) | (14) | (246) | (486) | (27) | (513) |
| Total Consumer Loans | 208 | (383) | (175) | 1,113 | (528) | 585 |
| Total Portfolio Loans | 2,084 | (2,853) | (769) | 5,501 | (5,305) | 196 |
| Total Loans(1)(3) | 2,117 | (2,853) | (736) | 5,550 | (5,305) | 245 |
| Total other earning assets | (53) | 24 | (29) | (121) | 36 | (85) |
| Change in Interest Earned on Interest-earning Assets | $2,106 | $(2,960) | $(854) | $5,803 | $(5,199) | $604 |
| Interest paid on: |  |  |  |  |  |  |
| Interest-bearing demand | $34 | $(137) | $(103) | $32 | $(283) | $(251) |
| Money market | (22) | (2,555) | (2,577) | 1,146 | (4,591) | (3,445) |
| Savings | (2) | (42) | (44) | (21) | (65) | (86) |
| Certificates of deposit | 1,241 | (2,175) | (934) | 2,357 | (4,900) | (2,543) |
| Total Interest-bearing Deposits | 1,251 | (4,909) | (3,658) | 3,514 | (9,839) | (6,325) |
| Short-term borrowings | (340) | (203) | (543) | (837) | (319) | (1,156) |
| Long-term borrowings | (238) | (2) | (240) | (238) | (3) | (241) |
| Junior subordinated debt securities | 1 | (80) | (79) | 2 | (158) | (156) |
| Total Borrowings | (577) | (285) | (862) | (1,073) | (480) | (1,553) |
| Other interest-bearing liabilities | (94) | (41) | (135) | (323) | (81) | (404) |
| Change in Interest Paid on Interest-bearing Liabilities | 580 | (5,235) | (4,655) | 2,118 | (10,400) | (8,282) |
| Change in Net Interest Income | $1,526 | $2,275 | $3,801 | $3,685 | $5,201 | $8,886 |

(1) Tax-exempt income is on an FTE basis (non-GAAP) using the statutory federal corporate income tax rate of 21 percent.

(2) Taxable investment income is adjusted for the dividend-received deduction for equity securities.

(3) Nonaccruing loans are included in the daily average loan amounts outstanding.

(4) Changes to rate/volume are allocated to both rate and volume on a proportionate dollar basis.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

### Provision for Credit Losses

The provision for credit losses includes a provision for losses on loans and on unfunded commitments. The provision for credit losses fluctuates based on changes in loan balances, risk ratings, net loan charge-offs/recoveries, the macro environment and our Current Expected Credit Loss, or CECL, forecast.

The provision for credit losses decreased $0.9 million to $1.1 million for the three months ended June 30, 2026 compared to $2.0 million for the same period in 2025. The decrease was primarily related to a lower provision for unfunded loan commitments due to a decline in loss rates. The provision for credit losses increased $3.5 million to $2.4 million for the six months ended June 30, 2026 compared to a negative $1.1 million for the same period in 2025. The increase was related to higher net loan charge-offs and specific reserves for loans individually evaluated compared to the same periods in 2025, which was partially offset by a decrease in the reserve for unfunded loan commitments due to lower loss rates.

Net loan charge-offs were $1.0 million and $2.7 million for the three and six months ended June 30, 2026 compared to net loan charge-offs of $1.2 million and $1.1 million for the same periods in 2025. Refer to the Allowance for Credit Losses section of this MD&A for further details.

Noninterest Income

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Three Months Ended June 30, / $ Change | Three Months Ended June 30, / % Change | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 | Six Months Ended June 30, / $ Change | Six Months Ended June 30, / % Change |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Net gain (loss) on sale of securities | $169 | — | $169 | NM | $169 | $(2,295) | $2,464 | NM |
| Debit and credit card | 4,695 | 4,588 | 107 | 2.3% | 8,978 | 8,776 | 202 | 2.3% |
| Service charges on deposit accounts | 4,290 | 4,090 | 200 | 4.9% | 8,486 | 8,052 | 434 | 5.4% |
| Investment services and trust | 3,563 | 3,042 | 521 | 17.1% | 6,932 | 6,126 | 806 | 13.2% |
| Other noninterest income | 2,143 | 1,780 | 363 | 20.4% | 3,937 | 3,270 | 667 | 20.4% |
| Total Noninterest Income | $14,860 | $13,500 | $1,360 | 10.1% | $28,502 | $23,929 | $4,573 | 19.1% |
| NM - not meaningful |  |  |  |  |  |  |  |  |

Noninterest income increased $1.4 million for the three months ended June 30, 2026 and increased $4.6 million for the six months ended June 30, 2026 compared to the same periods in 2025. Investments services and trust increased $0.5 million for the three months ended June 30, 2026 and $0.8 million for the six months ended June 30, 2026 compared to the same period in 2025 due to an increase in financial services fees. The most significant increase for the six months ended June 30, 2026 is due to a $0.2 million net gain on the sale of securities compared to a $2.3 million loss on sale of securities that occurred in 2025. The $0.2 million represents a gain of $1.9 million related to Visa Class B-2 common stock conversion which was offset by a $1.7 million loss related to the repositioning of securities into longer duration, higher yielding securities. Other noninterest income increased $0.4 million for the three months ended June 30, 2026 and $0.7 million for the six months ended June 30, 2026 primarily due to increases in partnership income and unrealized gains on equity securities.

### Noninterest Expense

| (dollars in thousands) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Three Months Ended June 30, / $ Change | Three Months Ended June 30, / % Change | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 | Six Months Ended June 30, / $ Change | Six Months Ended June 30, / % Change |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Salaries and employee benefits | $32,680 | $32,907 | $(227) | (0.7)% | $64,036 | $62,760 | $1,276 | 2.0% |
| Data processing and information technology | 5,163 | 4,847 | 316 | 6.5% | 10,321 | 9,777 | 544 | 5.6% |
| Occupancy | 4,074 | 4,024 | 50 | 1.2% | 8,666 | 8,326 | 340 | 4.1% |
| Furniture, equipment and software | 3,524 | 3,352 | 172 | 5.1% | 7,016 | 6,835 | 181 | 2.6% |
| Other taxes | 1,773 | 2,088 | (315) | (15.1)% | 3,836 | 3,582 | 254 | 7.1% |
| Marketing | 1,876 | 1,490 | 386 | 25.9% | 3,343 | 3,105 | 238 | 7.7% |
| Professional services and legal | 1,286 | 1,739 | (453) | (26.0)% | 2,531 | 3,025 | (494) | (16.3)% |
| FDIC insurance | 1,074 | 1,062 | 12 | 1.1% | 2,147 | 2,102 | 45 | 2.1% |
| Other | 7,214 | 6,605 | 609 | 9.2% | 13,475 | 13,693 | (218) | (1.6)% |
| Total Noninterest Expense | $58,664 | $58,114 | $550 | 0.9% | $115,371 | $113,205 | $2,166 | 1.9% |

Noninterest expense increased $0.6 million and $2.2 million for the three and six months ended June 30, 2026 compared to the same periods in 2025. The increase of $0.6 million for the three months ended June 30, 2026 was primarily due to normal fluctuations across several expense categories and timing-related items. The increase of $2.2 million for the six months ended June 30, 2026 was primarily due to an increase in salaries and employee benefits of $1.3 million driven by annual merit increases and the acquisition of new talent.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

### Provision for Income Taxes

The provision for income taxes increased $0.7 million to $8.8 million for the three months ended June 30, 2026 and increased $1.4 million to $17.8 million for the six months ended June 30, 2026 compared to $8.1 million and $16.4 million for the same periods in 2025. The increase in our provision for income taxes was due to higher pretax income for the three and six months ended June 30, 2026 compared to the same periods in 2025. Our effective tax rate was 19.4 percent for the three months ended June 30, 2026 and 19.9 percent for the six months ended June 30, 2026 compared to 20.2 percent and 20.1 percent for the same period in 2025. The decrease in our effective tax rate for the three and six months ended June 30, 2026 was primarily due to an increase in tax credits and losses on low-income housing and historic partnership investments compared to the same periods in 2025.

### Financial Condition at June 30, 2026

Total assets were $9.9 billion at both June 30, 2026 and December 31, 2025. Cash and due from banks increased $54.4 million related to an increase in deposits and a modest decline in loans compared to December 31, 2025. Total portfolio loans decreased $13.6 million, or 0.2 percent, to $8.1 billion at June 30, 2026 compared to December 31, 2025. The commercial loan portfolio increased $25.2 million compared to December 31, 2025 due to an increase in commercial construction and commercial and industrial loans. The consumer loan portfolio decreased $38.8 million compared to December 31, 2025 due to lower mortgage originations, increased sales of newly originated mortgage loans and higher payoffs within other consumer loans.

Securities increased $25.6 million to $1.0 billion at June 30, 2026 compared to December 31, 2025. The increase in the debt securities portfolio was primarily due to purchases offset by an increase in unrealized losses as a result of higher interest rates.

Total deposits increased $127.3 million, or 1.6 percent, to $8.1 billion at June 30, 2026 compared to $8.0 billion at December 31, 2025. Customer deposits increased $307.7 million, or 4.0 percent, to $8.1 billion at June 30, 2026 compared to $7.8 billion at December 31, 2025 driven by increases in core relationships and growth across nearly all deposit product categories. Growth in customer deposits enabled a reduction in money market brokered deposits which decreased $180.4 million compared to December 31, 2025.

Total borrowings increased $10.0 million to $275.3 million at June 30, 2026 compared to $265.3 million at December 31, 2025.

Total shareholders’ equity decreased by $60.1 million to $1.4 billion at June 30, 2026 compared to $1.5 billion at December 31, 2025. The decrease was primarily due to repurchases of S&T common stock of $98.3 million during the six months ended June 30, 2026, which includes excise tax and commissions of $1.1 million, other comprehensive loss of $7.6 million and dividends of $26.7 million offset by net income of $71.7 million. During the six months ended June 30, 2026, 2,221,024 common shares were repurchased at an average price of $43.75 per share.

### Securities Activity

The following table summarizes our securities portfolio at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 |  |
| --- | --- | --- | --- |
| U.S. Treasury securities | $54,360 | $84,507 | $(30,147) |
| Collateralized mortgage obligations of U.S. government corporations and agencies | 641,891 | 624,263 | 17,628 |
| Residential mortgage-backed securities of U.S. government corporations and agencies | 31,916 | 31,336 | 580 |
| Commercial mortgage-backed securities of U.S. government corporations | 277,442 | 241,262 | 36,180 |
| Obligations of states and political subdivisions | 4,850 | 4,909 | (59) |
| Available-for-Sale Debt Securities | 1,010,459 | 986,277 | 24,182 |
| Equity securities | 2,846 | 1,382 | 1,464 |
| Total Securities Available for Sale | $1,013,305 | $987,659 | $25,646 |

We invest in various securities in order to maintain a source of liquidity, to satisfy various pledging requirements, to increase net interest income and as a tool of ALCO to reposition the balance sheet for interest rate risk purposes. Securities are subject to market risks that could negatively affect the level of liquidity available to us.

The securities portfolio increased $25.6 million to $1.0 billion at June 30, 2026 compared to December 31, 2025. The increase in the debt securities portfolio was primarily related to net purchases offset by an increase in unrealized losses of $10.9 million at June 30, 2026 compared to December 31, 2025 as a result of higher interest rates.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Our debt securities portfolio was in a net unrealized loss position of $45.8 million at June 30, 2026 compared to a net unrealized loss position of $34.9 million at December 31, 2025. At June 30, 2026, our debt securities portfolio had gross unrealized losses of $47.1 million offset by $1.3 million of gross unrealized gains compared to gross unrealized losses of $42.4 million offset by gross unrealized gains of $7.5 million at December 31, 2025. We recognized $1.7 million of realized losses due to the repositioning of $34.8 million of our securities portfolio into longer duration, higher-yielding securities during the three months ended June 30, 2026.

### Loan Composition

The following table summarizes our loan portfolio at the dates presented:

| (dollars in thousands) | June 30, 2026 / Amount | June 30, 2026 / % of Total | December 31, 2025 / Amount | December 31, 2025 / % of Total | $ Change | % Change |
| --- | --- | --- | --- | --- | --- | --- |
| Commercial |  |  |  |  |  |  |
| Commercial real estate | $3,485,893 | 43.3% | $3,626,784 | 44.9% | $(140,891) | (3.9)% |
| Commercial and industrial | 1,590,086 | 19.7% | 1,519,336 | 18.9% | 70,750 | 4.7% |
| Commercial construction | 475,450 | 5.9% | 380,091 | 4.7% | 95,359 | 25.1% |
| Total Commercial Loans | 5,551,429 | 68.9% | 5,526,211 | 68.5% | 25,218 | 0.5% |
| Consumer |  |  |  |  |  |  |
| Consumer real estate | 2,426,871 | 30.1% | 2,454,466 | 30.4% | (27,595) | (1.1)% |
| Other consumer | 80,086 | 1.0% | 91,280 | 1.1% | (11,194) | (12.3)% |
| Total Consumer Loans | 2,506,957 | 31.1% | 2,545,746 | 31.5% | (38,789) | (1.5)% |
| Total Portfolio Loans | $8,058,386 | 100.0% | $8,071,957 | 100.0% | $(13,571) | (0.2)% |

The loan portfolio represents the most significant source of interest income for us. The risk that borrowers will be unable to pay such obligations is inherent in the loan portfolio. Other conditions, such as downturns in the borrower’s industry or the overall economic climate, can significantly impact the borrower’s ability to pay.

Total portfolio loans were $8.1 billion at both June 30, 2026 and December 31, 2025. Loan balances declined during the three months ended March 31, 2026 due to increased competition and higher CRE payoffs, but increased during the three months ended June 30, 2026 due to growth in the commercial loan portfolio. This resulted in a relatively unchanged loan balance compared to December 31, 2025.

Commercial loans, including CRE, C&I and commercial construction comprised 68.9 percent of total portfolio loans at June 30, 2026 compared to 68.5 percent at December 31, 2025. The commercial loan portfolio increased $25.2 million at June 30, 2026 compared to December 31, 2025 due to increases of $95.4 million in commercial construction and $70.7 million in C&I offset by a decrease of $140.9 million in CRE.

Consumer loans represent 31.1 percent of our total portfolio loans at June 30, 2026 compared to 31.5 percent at December 31, 2025. The consumer loan portfolio decreased $38.8 million at June 30, 2026 compared to December 31, 2025 due to a decrease of $27.6 million in consumer real estate related to lower mortgage originations and increased sales of newly originated mortgage loans and a decrease of $11.2 million in other consumer loans related to higher payoffs.

At June 30, 2026, 22 percent of our total loans were adjustable rate, 38 percent were floating rate and 40 percent were fixed rate compared to 23 percent adjustable rate loans, 37 percent floating rate loans and 40 percent fixed rate loans at December 31, 2025.

### Allowance for Credit Losses

We maintain an ACL at a level determined to be adequate to absorb estimated expected credit losses within the loan portfolio over the contractual life of an instrument that considers our historical loss experience, current conditions and forecasts of future economic conditions as of the balance sheet date. We develop and document a systematic ACL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Business Banking, 5) Consumer Real Estate and 6) Other Consumer. Refer to Part 1. Financial Information, Note 5. Loans and Allowance for Credit Losses for details on our portfolio segments.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following table presents activity in the ACL for the period presented:

_Six Months Ended June 30, 2026_

| (dollars in thousands) | Commercial Real Estate | Commercial and Industrial | Commercial Construction | Business Banking | Consumer Real Estate | Other Consumer | Total Loans |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Allowance for credit losses on loans: |  |  |  |  |  |  |  |
| Balance at beginning of period | $29,357 | $29,142 | $4,400 | $11,335 | $16,297 | $2,647 | $93,178 |
| Provision for credit losses on loans(1) | (784) | 2,406 | 968 | — | 63 | 171 | 2,824 |
| Charge-offs | — | (753) | (69) | (817) | (502) | (1,030) | (3,171) |
| Recoveries | 4 | 99 | — | 109 | 107 | 170 | 489 |
| Net (Charge-offs) Recoveries | 4 | (654) | (69) | (708) | (395) | (860) | (2,682) |
| Balance at End of Period | $28,577 | $30,894 | $5,299 | $10,627 | $15,965 | $1,958 | $93,320 |
| (1) Excludes the provision for credit losses for unfunded commitments. |  |  |  |  |  |  |  |

The following table presents key ACL ratios for the periods presented:

| Line item | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Ratio of net charge-offs to average loans outstanding(1) | 0.07% | 0.18% |
| Allowance for credit losses as a percentage of total portfolio loans | 1.16% | 1.15% |
| Allowance for credit losses to nonaccrual loans | 232% | 168% |

(1) Year-to-date net charge-offs annualized

The ACL was relatively unchanged at $93.3 million, or 1.16 percent of total portfolio loans, at June 30, 2026 compared to $93.2 million, or 1.15 percent of total portfolio loans, at December 31, 2025. Special mention loans increased $73.9 million to $142.9 million at June 30, 2026 compared to $69.0 million at December 31, 2025. The increase in special mention loans was primarily related to downgrades of four C&I relationships and three CRE relationships. The impact to the ACL resulting from higher special mention loans was mostly offset by a decrease in substandard loans. Substandard loans decreased $28.1 million to $97.0 million at June 30, 2026 compared to $125.1 million at December 31, 2025. The decrease in the amount of substandard loans was primarily due to loan paydowns.

Nonperforming assets, or NPAs, consist of nonaccrual loans and OREO. The following represents NPAs at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 | $ Change |
| --- | --- | --- | --- |
| Nonaccrual Loans |  |  |  |
| Commercial real estate | $9,354 | $17,373 | $(8,019) |
| Commercial and industrial | 16,836 | 25,575 | (8,739) |
| Commercial construction | — | 869 | (869) |
| Consumer real estate | 13,886 | 11,583 | 2,303 |
| Other Consumer | 140 | 158 | (18) |
| Total Nonaccrual Loans | 40,216 | 55,558 | (15,342) |
| OREO | — | 57 | (57) |
| Total Nonperforming Assets | $40,216 | $55,615 | $(15,399) |
| Asset Quality Ratios: |  |  |  |
| Nonaccrual loans as a percent of total portfolio loans | 0.50% | 0.69% | (0.19)% |
| Nonperforming assets as a percent of total portfolio loans plus OREO | 0.50% | 0.69% | (0.19)% |

Our policy is to place loans in all categories in nonaccrual status when collection of interest or principal is doubtful, or generally when interest or principal payments are 90 days or more past the contractual due date. Nonaccrual loans decreased $15.4 million to $40.2 million at June 30, 2026 compared to $55.6 million at December 31, 2025. The decrease in nonaccrual loans was primarily due to paydowns in our commercial portfolio.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

### Deposits

Deposits are our primary source of funds. The following table presents the composition of deposits at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 | $ Change |
| --- | --- | --- | --- |
| Customer Deposits |  |  |  |
| Noninterest-bearing demand | $2,256,542 | $2,160,645 | $95,897 |
| Interest-bearing demand | 769,495 | 790,278 | (20,783) |
| Money market | 2,183,937 | 2,016,560 | 167,377 |
| Savings | 881,967 | 862,118 | 19,849 |
| Certificates of deposit | 1,994,142 | 1,948,792 | 45,350 |
| Total Customer Deposits | 8,086,083 | 7,778,393 | 307,690 |
| Brokered Deposits |  |  |  |
| Money market | — | 180,438 | (180,438) |
| Total Brokered Deposits | — | 180,438 | (180,438) |
| Total Deposits | $8,086,083 | $7,958,831 | $127,252 |

Total deposits increased $127.3 million, or 1.6 percent, at June 30, 2026 compared to December 31, 2025. Customer deposits increased $307.7 million, or 4.0 percent, compared to December 31, 2025, driven by increases in core relationships and growth across nearly all deposit product categories. Demand deposits increased $95.9 million, or 4.4 percent, compared to December 31, 2025, representing 28 percent of total deposits at June 30, 2026. Growth in customer deposits enabled a reduction in money market brokered deposits, which decreased $180.4 million from December 31, 2025. Brokered deposits are an additional source of funds utilized by ALCO as a way to diversify funding sources, as well as manage our funding costs and structure.

As a member of the IntraFi network, we are able to offer our customers insurance coverage on interest-bearing demand, money market and certificates of deposit balances in excess of the FDIC insurance limits. IntraFi balances were $334.1 million at June 30, 2026 compared to $317.3 million at December 31, 2025.

We had total uninsured deposits of $2.9 billion, or 36.0 percent of our total deposit base, at June 30, 2026 compared to $2.7 billion, or 33.7 percent of our total deposit base, at December 31, 2025.

### Borrowings

Borrowings are an additional source of funding for us. Short-term borrowings are for terms under or equal to one year and are comprised of Federal Home Loan Bank, or FHLB, Advances. Long-term borrowings are for original terms greater than one year and are comprised of FHLB advances and finance leases. Total borrowings increased $10.0 million to $275.3 million at June 30, 2026 compared to $265.3 million at December 31, 2025.

The following table presents the composition of total borrowings at the dates presented:

| (dollars in thousands) | June 30, 2026 | December 31, 2025 | $ Change |
| --- | --- | --- | --- |
| Short-term borrowings | $200,000 | $165,000 | $35,000 |
| Long-term borrowings | 25,773 | 50,815 | (25,042) |
| Junior subordinated debt securities | 49,508 | 49,478 | 30 |
| Total Borrowings | $275,281 | $265,293 | $9,988 |

Information pertaining to short-term borrowings is summarized in the table below for the six months ended June 30, 2026 and for the twelve months ended December 31, 2025:

| (dollars in thousands) | Short-Term Borrowings / June 30, 2026 | Short-Term Borrowings / December 31, 2025 |
| --- | --- | --- |
| Balance at the period end | $200,000 | $165,000 |
| Average balance during the period | $106,209 | $111,453 |
| Average interest rate during the period | 3.86% | 4.53% |
| Maximum month-end balance during the period | $200,000 | $165,000 |
| Average interest rate at the period end | 3.87% | 3.93% |

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Information for long-term borrowings and junior subordinated debt securities is summarized in the tables below for the six months ended June 30, 2026 and for the twelve months ended December 31, 2025:

| (dollars in thousands) | Long-Term Borrowings / June 30, 2026 | Long-Term Borrowings / December 31, 2025 |
| --- | --- | --- |
| Balance at the period end | $25,773 | $50,815 |
| Average balance during the period | $25,783 | $50,856 |
| Average interest rate during the period | 3.76% | 3.80% |
| Maximum month-end balance during the period | $50,809 | $50,890 |
| Average interest rate at the period end | 3.71% | 3.75% |
|  | Junior Subordinated Debt Securities |  |
| (dollars in thousands) | June 30, 2026 | December 31, 2025 |
| Balance at the period end | $49,508 | $49,478 |
| Average balance during the period | $49,499 | $49,446 |
| Average interest rate during the period | 6.47% | 7.04% |
| Maximum month-end balance during the period | $49,508 | $49,478 |
| Average interest rate at the period end | 6.25% | 6.33% |

### Liquidity and Capital Resources

Liquidity is defined as a financial institution’s ability to meet its cash and collateral obligations at a reasonable cost. Our primary future cash needs are centered on the ability to (i) satisfy the financial needs of depositors who may want to withdraw funds or of borrowers needing to access funds to meet their credit needs and (ii) to meet our future cash commitments under contractual obligations with third parties. In order to manage liquidity risk, our Board of Directors has delegated authority to ALCO for the formulation, implementation and oversight of liquidity risk management for S&T. ALCO’s goal is to maintain adequate levels of liquidity at a reasonable cost to meet funding needs in both a normal operating environment and for potential liquidity stress events. ALCO monitors and manages liquidity through various ratios, reviewing cash flow projections, performing stress tests and having a detailed contingency funding plan. ALCO policy guidelines define graduated risk tolerance levels. If our liquidity position moves to a level that has been defined as high risk, specific actions are required, such as increased monitoring or the development of an action plan to reduce the risk position.

Our primary funding and liquidity source is a stable customer deposit base. We believe S&T has the ability to retain existing deposits and attract new deposits, mitigating any funding dependency on other more volatile funding sources. Refer to the Financial Condition at June 30, 2026 - Deposits section of this MD&A, for additional discussion on deposits. Although deposits are the primary source of funds, we have identified various other funding sources that can be used as part of our normal funding program. Additional funding sources accessible to us include borrowing availability at the FHLB, Federal Reserve Discount Window through the Borrower-in-Custody Program, federal funds lines with other financial institutions and the brokered deposit market.

Available borrowing capacity exceeds uninsured deposits of $2.9 billion at June 30, 2026. The following table summarizes funding sources available at the dates presented:

| (dollars in thousands) | June 30, 2026 / Borrowing Capacity | June 30, 2026 / Balance (1) | June 30, 2026 / Available | December 31, 2025 / Borrowing Capacity | December 31, 2025 / Balance (1) | December 31, 2025 / Available |
| --- | --- | --- | --- | --- | --- | --- |
| FHLB(1) | $2,104,290 | $382,847 | $1,721,443 | $2,132,446 | $339,614 | $1,792,832 |
| Borrower-in-Custody Program | 2,118,063 | — | 2,118,063 | 2,124,366 | — | 2,124,366 |
| Total | $4,222,353 | $382,847 | $3,839,506 | $4,256,812 | $339,614 | $3,917,198 |
| (1) FHLB balances include advances, letters of credit, interest due on advances and the credit enhancement obligation on mortgages sold to the FHLB. |  |  |  |  |  |  |

We have contractual obligations representing required future payments on certificates of deposit, junior subordinated debt securities, short-term borrowings, long-term borrowings, operating and capital leases, funding commitments on tax credit equity investments and purchase obligations. See the Liquidity and Capital Resources section presented in our 2025 Form 10-K under Part II, Item 7- Management’s Discussion and Analysis of Financial Condition and Results of Operations for more information on these future cash outflows. There have been no material changes to the contractual obligations previously disclosed in our 2025 Form 10-K.

An important component of our ability to effectively respond to potential liquidity stress events is maintaining a cushion of highly liquid assets. Highly liquid assets are those that can be converted to cash quickly to meet financial obligations. ALCO

S&T BANCORP, INC. AND SUBSIDIARIES

Item 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

policy guidelines define a ratio of highly liquid assets to total assets by graduated risk tolerance levels of minimal, moderate and high. At June 30, 2026, S&T Bank had $916.2 million in highly liquid assets which consisted primarily of $146.0 million in interest-bearing deposits with banks and $765.5 million in unpledged securities. This resulted in a highly liquid assets to total assets ratio of 9.2 percent at June 30, 2026.

We continue to maintain a strong capital position with our capital ratios in excess of the well-capitalized regulatory guidelines. The following table summarizes capital amounts and ratios for S&T and S&T Bank at the dates presented:

| (dollars in thousands) | Adequately Capitalized | Well-Capitalized | June 30, 2026 / Amount | June 30, 2026 / Ratio | December 31, 2025 / Amount | December 31, 2025 / Ratio |
| --- | --- | --- | --- | --- | --- | --- |
| S&T Bancorp, Inc. |  |  |  |  |  |  |
| Tier 1 leverage | 4.00% | 5.00% | $1,102,245 | 11.58% | $1,154,736 | 12.18% |
| Common equity tier 1 to risk-weighted assets | 4.50% | 6.50% | 1,078,245 | 13.64% | 1,130,736 | 14.32% |
| Tier 1 capital to risk-weighted assets | 6.00% | 8.00% | 1,102,245 | 13.95% | 1,154,736 | 14.62% |
| Total capital to risk-weighted assets | 8.00% | 10.00% | 1,226,031 | 15.51% | 1,278,474 | 16.19% |
| S&T Bank |  |  |  |  |  |  |
| Tier 1 leverage | 4.00% | 5.00% | $1,048,200 | 11.02% | $1,128,495 | 11.91% |
| Common equity tier 1 to risk-weighted assets | 4.50% | 6.50% | 1,048,200 | 13.28% | 1,128,495 | 14.30% |
| Tier 1 capital to risk-weighted assets | 6.00% | 8.00% | 1,048,200 | 13.28% | 1,128,495 | 14.30% |
| Total capital to risk-weighted assets | 8.00% | 10.00% | 1,171,896 | 14.84% | 1,252,175 | 15.86% |

We have filed a shelf registration statement on Form S-3 under the Securities Act of 1933, as amended, with the SEC which allows for the issuance of a variety of securities including debt and capital securities, preferred and common stock and warrants. We may use the proceeds from the sale of securities for general corporate purposes which could include investments at the holding company level, investing in, or extending credit to subsidiaries, possible acquisitions and stock repurchases. We have not issued any securities pursuant to this shelf registration statement at June 30, 2026.

S&T BANCORP, INC. AND SUBSIDIARIES

## Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is defined as the degree to which changes in interest rates, foreign exchange rates, commodity prices or equity prices can adversely affect a financial institution’s earnings or capital. For most financial institutions, including S&T, market risk primarily reflects exposures to changes in interest rates. Interest rate fluctuations affect earnings by changing net interest income and other interest-sensitive income and expense levels. Interest rate changes also affect capital by changing the net present value of a bank’s future cash flows, and the cash flows themselves, as rates change. Accepting this risk is a normal part of banking and can be an important source of profitability and enhancing shareholder value. However, excessive interest rate risk can threaten a bank’s earnings, capital, liquidity and solvency. Our sensitivity to changes in interest rate movements is continually monitored by ALCO. ALCO monitors and manages market risk through rate shock analyses, economic value of equity, or EVE, analyses and by performing stress tests and simulations to mitigate earnings and market value fluctuations due to changes in interest rates.

Rate shock analyses results are compared to a base case to provide an estimate of the impact that market rate changes may have on 12 and 24 months of pretax net interest income. The base case and rate shock analyses are performed on a static balance sheet. A static balance sheet is a no growth balance sheet in which all maturing and/or repricing cash flows are reinvested in the same product at the existing product spread. Rate shock analyses assume an immediate parallel shift in market interest rates and also include management assumptions regarding the impact of interest rate changes on non-maturity deposit products (noninterest-bearing demand, interest-bearing demand, money market and savings) and changes in the prepayment behavior of loans and securities with optionality. S&T policy guidelines limit the change in pretax net interest income over 12 and 24 month horizons using rate shocks in increments of +/- 100 basis points. Policy guidelines define the percentage change in pretax net interest income by graduated risk tolerance levels of minimal, moderate and high.

In order to monitor interest rate risk beyond the 24 month time horizon of rate shocks on pretax net interest income, we also perform EVE analyses. EVE represents the present value of all asset cash flows minus the present value of all liability cash flows. EVE change results are compared to a base case to determine the impact that market rate changes may have on our EVE. As with rate shock analyses on pretax net interest income, EVE analyses incorporate management assumptions regarding prepayment behavior of fixed rate loans and securities with optionality and the behavior and value of non-maturity deposit products. S&T policy guidelines limit the change in EVE using rate shocks in increments of +/- 100 basis points. Policy guidelines define the percentage change in EVE by graduated risk tolerance levels of minimal, moderate and high.

The table below reflects the rate shock analyses results for the 1-12 and 13-24 month periods of pretax net interest income and EVE:

| Line item | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
|  | 13 - 24 Months | 13 - 24 Months |
| Change in Interest Rate (basis points) | % Change in Pretax Net Interest Income | % Change in Pretax Net Interest Income |
| 400 | 10.5 | 9.4 |
| 300 | 7.7 | 6.9 |
| 200 | 5.6 | 5.0 |
| 100 | 3.3 | 2.9 |
| -100 | (4.2) | (4.5) |
| -200 | (9.8) | (10.2) |
| -300 | (18.5) | (17.0) |

The results from the rate shock analyses on net interest income are generally consistent with having an asset sensitive balance sheet. Having an asset sensitive balance sheet means more assets than liabilities will reprice during the measured time frames. The implications of an asset sensitive balance sheet will differ depending upon the change in market interest rates. For example, with an asset sensitive balance sheet in a declining interest rate environment, more assets than liabilities will decrease in rate. This situation could result in a decrease in net interest income and operating income. Conversely, with an asset sensitive balance sheet in a rising interest rate environment, more assets than liabilities will increase in rate. This situation could result in an increase in net interest income and operating income.

Our rate shock analyses show more improvement in the percentage change in pretax net interest income in the 1-12 month rates up and a larger decline in the percentage change in pretax net interest income in the 1-12 month rates down scenarios when comparing June 30, 2026 to December 31, 2025 because of a greater impact of floating rate loans and maturities within our received-fixed balance sheet swap portfolio. Our rate shock analyses remain relatively unchanged in the percentage change in pretax net interest income in the 13-24 month scenarios when comparing June 30, 2026 to December 31, 2025. Our EVE analyses remain relatively unchanged when comparing June 30, 2026 to December 31, 2025.

In addition to rate shocks and EVE analyses, we perform a market risk stress test at least annually. The market risk stress test includes sensitivity analyses and simulations. Sensitivity analyses are performed to help us identify which model

S&T BANCORP, INC. AND SUBSIDIARIES

Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

assumptions cause the greatest impact on pretax net interest income. Sensitivity analyses may include changing prepayment behavior of loans and securities with optionality and the impact of interest rate changes on non-maturity deposit products. Simulation analyses may include the potential impact of more dynamic rate changes beyond rate shocks, yield curve shape changes, significant balance mix changes and various growth scenarios.

## Item 4. CONTROLS AND PROCEDURES

### Evaluation of Disclosure Controls and Procedures

Under the supervision and with the participation of S&T’s Chief Executive Officer, or CEO, and Chief Financial Officer, or CFO (its principal executive officer and principal financial officer, respectively), management has evaluated the effectiveness of the design and operation of S&T’s disclosure controls and procedures as of June 30, 2026. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives. We maintain disclosure controls and procedures that are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, or the Exchange Act, is recorded, processed, summarized and reported within the time periods required by the Securities and Exchange Commission, or the SEC, and that such information is accumulated and communicated to S&T’s management, including our CEO and CFO, as appropriate to allow timely decisions regarding required disclosure.

Based on and as of the date of such evaluation, our CEO and CFO concluded that the design and operation of our disclosure controls and procedures were effective in all material respects, as of the end of the period covered by this report.

### Changes in Internal Control over Financial Reporting

During the quarter ended June 30, 2026, there were no changes made to S&T’s internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that materially affected, or are reasonably likely to materially affect, S&T’s internal control over financial reporting.

S&T BANCORP, INC. AND SUBSIDIARIES

### PART II

### OTHER INFORMATION

## Item 1. Legal Proceedings

None

## Item 1A. Risk Factors

There have been no material changes to the risk factors that we have previously disclosed in Part I, Item 1A – Risk Factors in our 2025 Form 10-K for the year ended December 31, 2025, as filed with the SEC on February 27, 2026.

## Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

### Purchases of Equity Securities

On January 21, 2026, our Board of Directors authorized a $100 million share repurchase program effective January 26, 2026 which was set to expire February 1, 2027. The program authorized the share repurchase of S&T's common stock from time to time through a combination of open market and privately negotiated transactions up to the authorized $100 million aggregate value of S&T's common stock. The specific timing, price and quantity of repurchases was at the discretion of S&T and depended on a variety of factors, including general market conditions, the trading price of the common stock, applicable securities laws and other legal and contractual requirements, as well as S&T's financial performance. The repurchase program did not obligate S&T to repurchase any particular number of shares and may be extended, modified or discontinued at any time. During the second quarter of 2026, 1,074,924 shares were repurchased under the plan, at an average price of $44.24 per share, for $47.6 million excluding excise tax and commissions. At June 30, 2026, 2,221,024 shares were repurchased under the plan, at an average price of $43.75 per share, for $97.2 million excluding excise tax and commissions. The following table is a summary of our purchases of common stock during the second quarter of 2026:

| Period | Total number of shares purchased | Average price paid per share(1) | Total number of shares purchased as part of publicly announced plan | Approximate dollar value of shares that may yet be purchased under the plan(1) |
| --- | --- | --- | --- | --- |
| 04/01/2026-04/30/2026 | 197,600 | $44.22 | 197,600 | $41,641,494 |
| 05/01/2026-05/31/2026 | 877,324 | 44.25 | 877,324 | 2,822,154 |
| 06/01/2026-06/30/2026 | — | — | — | 2,822,154 |
| Total | 1,074,924 | $44.24 | 1,074,924 | $2,822,154 |

(1) Excludes excise tax and commissions.

On July 22, 2026, our Board of Directors authorized a new $100 million share repurchase program which replaced the existing share repurchase program effective July 27, 2026 and is set to expire August 31, 2027. The remaining capacity of $2.8 million under the existing share repurchase program was terminated. The new program authorizes the share repurchase of S&T's common stock from time to time through a combination of open market and privately negotiated transactions up to the authorized $100 million aggregate value of S&T's common stock. The specific timing, price and quantity of repurchases will be at the discretion of S&T and will depend on a variety of factors, including general market conditions, the trading price of the common stock, applicable securities laws and other legal and contractual requirements, as well as S&T's financial performance. The repurchase program does not obligate S&T to repurchase any particular number of shares and may be extended, modified or discontinued at any time.

## Item 3. Defaults Upon Senior Securities

None.

## Item 4. Mine Safety Disclosures

Not Applicable.

## Item 5. Other Information

S&T BANCORP, INC. AND SUBSIDIARIES

(c) During the three and six months ended June 30, 2026, no director or Section 16 officer of the Company adopted, terminated or modified a ‘Rule 10b5-1 trading arrangement’ or ‘non-Rule 10b5-1 trading arrangement,’ as each term is defined in Item 408(a) of Regulation S-K.

## Item 6. Exhibits

|  |  |  |
| --- | --- | --- |
| 10.1 | Form of Restricted Stock Unit Award Agreement - Non-LTIP* | Filed herewith. |
| 10.2 | Form of Restricted Stock Unit Award Agreement - LTIP* | Filed herewith. |
| 10.3 | Form of Restricted Stock Unit Award Agreement - Directors* | Filed herewith. |
| 31.1 | Rule 13a-14(a) Certification of the Chief Executive Officer |  |
| 31.2 | Rule 13a-14(a) Certification of the Chief Financial Officer |  |
| 32 | Rule 13a-14(b) Certification of the Chief Executive Officer and Chief Financial Officer |  |
| 101.INS | XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document |  |
| 101.SCH | XBRL Taxonomy Extension Schema |  |
| 101.CAL | XBRL Taxonomy Extension Calculation Linkbase |  |
| 101.DEF | XBRL Taxonomy Extension Definition Linkbase |  |
| 101.LAB | XBRL Taxonomy Extension Label Linkbase |  |
| 101.PRE | XBRL Taxonomy Extension Presentation Linkbase |  |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibits 101) |  |
| *Management Contract or Compensatory Plan or Arrangement |  |  |

S&T BANCORP, INC. AND SUBSIDIARIES

### SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

S&T Bancorp, Inc.   (Registrant)

August 6, 2026 /s/ Mark Kochvar

Mark Kochvar   Senior Executive Vice President and   Chief Financial Officer   (Principal Financial Officer and Duly Authorized Signatory)

---

## EX-10.1

SEC source: [exhibit101formofrestricted.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit101formofrestricted.htm)

S&T BANCORP, INC.

2021 INCENTIVE PLAN

RESTRICTED STOCK UNIT AWARD AGREEMENT

1. Award of Restricted Stock Units. Pursuant to the S&T Bancorp, Inc. 2021 Incentive Plan (the “Plan”), S&T Bancorp, Inc. (the “Company”) hereby grants a Restricted Stock Unit Award to the Grantee (the “Award”). Upon acceptance of this Award, the Grantee shall receive the Share Amount, as set forth below, as approved by the Company’s Compensation and Benefits Committee of the Board of Directors (the “Committee”), subject to the restrictions and conditions set forth in the Plan and this Restricted Stock Unit Award Agreement (this “Agreement”).

2. Acceptance of Award. The Grantee shall have no rights with respect to this Award unless he or she shall have accepted this Award.

3. Restrictions and Conditions. Restricted Stock Units granted herein are subject to restrictions as set forth in the Plan and this Agreement.

4. Vesting of Restricted Stock Units. Except as otherwise provided in this Agreement, Restricted Stock Units covered by the Award shall become vested upon occurrence of the applicable Vesting Date shown below.

5. Death or Disability. Notwithstanding anything herein to the contrary, if Grantee should terminate employment from the Company due to death or disability (as those terms are defined in the Company’s qualified retirement plan) prior to the applicable Vesting Date, the Award shall vest on a pro-rata basis as of the date of such event.

6. Forfeiture. Except as otherwise provided in this Agreement, termination for cause or upon breach of a restrictive covenant shall result in forfeiture of the Award (vested and unvested). However, if the Grantee should terminate employment from the Company prior to full vesting of any portion of the Award for any reason other than death or disability, participation will cease as of the effective date of termination, and the Award, to the extent not previously vested, shall be forfeited. The Committee’s determination of the reason for termination of the Grantee’s employment shall be conclusive and binding on the Grantee and his or her representatives or legatees. For purposes of this section, “cause” shall mean, as determined by the Committee: (i) failure to substantially perform duties as reasonably assigned hereunder (other than by reason of disability), after reasonable written demand for substantial performance has been delivered by the Company specifically identifying the manner in which the Company believes Grantee has not performed Grantee’s duties, and Grantee has been given a reasonable opportunity (not to exceed fifteen (15) days) to cure any deficiencies in performance; (ii) willful misconduct that demonstrably results in material injury to the Company or their affiliates; (iii)fraud, dishonesty or willful breach of fiduciary duty that is injurious to the Company or their affiliates; (iv) conviction or plea of guilty or nolo

contendere to any felony or crime involving moral turpitude, fraud or dishonesty; (v) willful violation of any law, rule or regulation (other than traffic violations, misdemeanors or similar offenses) or cease-and-desist order, court order, judgment or supervisory agreement that demonstrably results in material injury to the Company or their affiliates; or (vi) a material breach by Grantee of (A) Grantee’s obligations under this Agreement or (B) any material written policy of the Company or their affiliates and, if the breach is curable, Grantee shall not have cured such material breach after reasonable written demand for cure has been delivered by the Company specifically identifying the material breach, and Grantee has been given a reasonable opportunity (not to exceed fifteen (15) days) to cure any such material breach (to the extent curable).

7. Settlement of Restricted Stock Units.

(a) The Restricted Stock Units shall be settled by the Company delivering to the Grantee (or after the Grantee’s death, the Grantee’s beneficiary), on the applicable scheduled settlement date a number of Shares equal to the number of Restricted Stock Units vested as of such date, together with any related Dividend Equivalents (as defined below).

(b) For purposes of this Agreement, the “scheduled settlement date” shall be as soon as administratively feasible following the applicable Vesting Date; provided that, the scheduled settlement date shall be no later than March 15 of the calendar year following the year in which the underlying Restricted Stock Unit vests.

(c) The delivery of any Shares may be postponed by the Company for such period as may be required for it to comply with any applicable foreign, federal, state, or provincial securities law, or any national securities exchange listing requirements, and the Company is not obligated to issue or deliver any Shares if, in the opinion of counsel for the Company, such issuance or delivery constitutes a violation by the Grantee or the Company of any provisions of any applicable foreign, federal, state, or provincial securities law or of any regulations of any governmental authority or any national securities exchange. For the avoidance of doubt, the grant of the Restricted Stock Units and the issuance of any Shares pursuant to this Agreement shall be subject to compliance with all applicable requirements of federal or state law with respect to such securities.

8. Dividend Equivalents. If the Company pays cash or stock dividends on the Common Stock, an amount equal to (a) the dollar amount of such cash dividend or (ii) the Fair Market Value of such stock dividend will be credited to a dividend equivalent account on behalf of the Grantee with respect to the Restricted Stock Unit Award. Credits on account of cash dividends will be held uninvested and will not accrue interest. Credits on account of stock dividends will be deemed to be reinvested in shares of Common Stock. All dividend equivalents will be paid in cash if and when the corresponding Restricted Stock Units are settled.

9. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan, including the powers of

2

the Committee set forth in the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein. The terms of the Plan shall not be considered an enlargement of any benefits under this Agreement. In addition, the Award is subject to any rules and regulations promulgated by the Committee. However, any Award subject to this Agreement may not in any way be restricted or limited by any Plan amendment or termination or by change of Committee rules and regulations approved after the Grant Date without the Grantee’s written consent.

10. Transferability. This Agreement (and the underlying Restricted Stock Units) is personal to the Grantee, is non-assignable, and is not transferable in any manner, by operation of law or otherwise, other than (i) by will or the laws of descent and distribution or (ii) pursuant to an order issued under state domestic relations laws.

11. Shareholder Rights. Neither the Grantee nor any person claiming through the Grantee shall have any rights as a stockholder with respect to any Restricted Stock Units, unless and until the Grantee has become the holder of record of the Shares, all conditions with respect to the issuance of the Shares have been satisfied in full, and the Shares shall have been issued and delivered to the Grantee.

12. Tax Withholding. Except as otherwise provided in this Agreement, the Grantee shall, not later than the date as of which the receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Committee for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. Except as otherwise provided in this Agreement, the Company shall have the authority to cause the required minimum tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Common Stock to be issued or released by the transfer agent a number of Shares with an aggregate Fair Market Value that would satisfy the withholding amount due.

13. Section 409A. The Restricted Stock Units are intended to be exempt from, or compliant with, Section 409A of the Code and shall be interpreted accordingly.

14. Fractional Shares. Fractional Shares will not be issued.

15. Adjustments. If at any time while the Award is outstanding, the number of outstanding Shares is changed by reason of reorganization, recapitalization, stock split, or any other event that affects the number and kind of Restricted Stock Units, the number and kind of Restricted Stock Units will be adjusted in accordance with the provisions of the Plan.

16. Governing Law. This Agreement shall be governed by the laws of the Commonwealth of Pennsylvania, other than its choice of law provisions.

17. Conflicts. In the event of any conflict between the provisions of the Plan and the provisions of this Agreement, the provisions of the Plan shall govern.

3

18. Grantee Bound by Plan. By accepting this Agreement, the Grantee hereby acknowledges receipt of a copy of the prospectus and Plan document and agrees to be bound by all the terms and provisions thereof.

19. No Obligation to Continue Service. Neither the Company nor any affiliate is obligated by or as a result of the Plan or this Agreement to continue the Grantee in service and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any affiliate to terminate the service of the Grantee at any time.

20. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

21. Force and Effect. The various provisions of this Agreement are severable in their entirety. Any determination of invalidity or unenforceability of any one provision shall have no effect on the continuing force and effect of the remaining provisions.

22. Successors. This Agreement shall be binding upon and inure to the benefit of the successors, assigns, and heirs of the respective parties.

23. Entire Agreement. This Agreement contains the entire understanding of the parties and shall not be modified or amended except in writing and duly signed by the parties. No waiver by either party of any default under this Agreement shall be deemed a waiver of any later default.

4

---

## EX-10.2

SEC source: [exhibit102formofrestricted.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit102formofrestricted.htm)

S&T BANCORP, INC.

2021 INCENTIVE PLAN

RESTRICTED STOCK UNIT AWARD AGREEMENT

1. Award of Restricted Stock Units. Pursuant to the S&T Bancorp, Inc. 2021 Incentive Plan (the “Plan”) and the S&T Bancorp, Inc. 2026 Long-Term Incentive Plan (the “LTIP”), S&T Bancorp, Inc. (the “Company”) hereby grants a Restricted Stock Unit Award to the Grantee named below consisting of (a) a “Time Restricted Stock Unit Award” (within the meaning of the LTIP) and (b) a “Performance Restricted Stock Unit Award” (within the meaning of the LTIP) (together, the “Award”). Upon acceptance of this Award, the Grantee shall receive the Number of Time and Performance Restricted Stock Units Granted, as set forth below, as approved by the Company’s Compensation and Benefits Committee of the Board of Directors (the “Committee”), subject to the restrictions and conditions set forth in the Plan, this Restricted Stock Unit Award Agreement (this “Agreement”), and the LTIP.

2. Acceptance of Award. The Grantee shall have no rights with respect to this Award unless he or she shall have accepted this Award.

3. Restrictions and Conditions. Restricted Stock Units granted herein are subject to restrictions as set forth in the Plan, this Agreement, and the LTIP.

4. Vesting of Restricted Stock Units. Except as otherwise provided in this Agreement, Restricted Stock Units covered by the Award shall become vested upon occurrence of the applicable Vesting Date (as that term is defined in the LTIP) with respect to such Restricted Stock Units covered by the Time Restricted Stock Unit Award and the Performance Restricted Stock Unit Award, respectively.

5. Death, Disability, or Retirement.

(a) Notwithstanding anything herein to the contrary, if Grantee should terminate employment from the Company due to death or disability (as those terms are defined in the Company’s qualified retirement plan) prior to the applicable Vesting Date: (i) the unvested Time Restricted Stock Unit Award shall vest on a pro-rata basis as of the date of such event; and (ii) a pro-rata portion of the Performance Restricted Stock Unit Award will remain outstanding and vest at the end of the Performance Period subject to achievement of the Performance Standards (as defined in the LTIP).

(b) Notwithstanding anything herein to the contrary, if Grantee should terminate employment from the Company due to Retirement prior to the applicable Vesting Date: (i) the unvested Time Restricted Stock Unit Award shall vest in full as of the date of such

termination; and (ii) the Performance Restricted Stock Unit Award shall be forfeited as of such termination.

6. Forfeiture. Except as otherwise provided in this Agreement, termination for cause or upon breach of a restrictive covenant shall result in forfeiture of the Award (vested and unvested). However, if the Grantee should terminate employment from the Company prior to full vesting of any portion of the Award for any reason other than death or disability, or retirement in the case of Time Restricted Stock Unit Awards, participation will cease as of the effective date of termination, and the Award, to the extent not previously vested, shall be forfeited. The Committee’s determination of the reason for termination of the Grantee’s employment shall be conclusive and binding on the Grantee and his or her representatives or legatees. For purposes of this section, “cause” shall mean, as determined by the Committee: (i) failure to substantially perform duties as reasonably assigned hereunder (other than by reason of disability), after reasonable written demand for substantial performance has been delivered by the Company specifically identifying the manner in which the Company believes Grantee has not performed Grantee’s duties, and Grantee has been given a reasonable opportunity (not to exceed fifteen (15) days) to cure any deficiencies in performance; (ii) willful misconduct that demonstrably results in material injury to the Company or their affiliates; (iii) fraud, dishonesty or willful breach of fiduciary duty that is injurious to the Company or their affiliates; (iv) conviction or plea of guilty or nolo contendere to any felony or crime involving moral turpitude, fraud or dishonesty; (v) willful violation of any law, rule or regulation (other than traffic violations, misdemeanors or similar offenses) or cease-and-desist order, court order, judgment or supervisory agreement that demonstrably results in material injury to the Company or their affiliates; or (vi) a material breach by Grantee of (A) Grantee’s obligations under this Agreement or (B) any material written policy of the Company or their affiliates and, if the breach is curable, Grantee shall not have cured such material breach after reasonable written demand for cure has been delivered by the Company specifically identifying the material breach, and Grantee has been given a reasonable opportunity (not to exceed fifteen (15) days) to cure any such material breach (to the extent curable).

7. Settlement of Restricted Stock Units.

(a) The Restricted Stock Units shall be settled by the Company delivering to the Grantee (or after the Grantee’s death, the Grantee’s beneficiary), on the applicable scheduled settlement date a number of Shares (as defined in the LTIP) equal to the number of Restricted Stock Units vested as of such date, together with any related Dividend Equivalents (as defined below).

(b) For purposes of this Agreement, the “scheduled settlement date” shall be as soon as administratively feasible following the applicable Vesting Date; provided that, the scheduled settlement date shall be no later than March 15 of the calendar year following the year in which the underlying Restricted Stock Unit vests.

2

(c) The delivery of any Shares may be postponed by the Company for such period as may be required for it to comply with any applicable foreign, federal, state, or provincial securities law, or any national securities exchange listing requirements, and the Company is not obligated to issue or deliver any Shares if, in the opinion of counsel for the Company, such issuance or delivery constitutes a violation by the Grantee or the Company of any provisions of any applicable foreign, federal, state, or provincial securities law or of any regulations of any governmental authority or any national securities exchange. For the avoidance of doubt, the grant of the Restricted Stock Units and the issuance of any Shares pursuant to this Agreement shall be subject to compliance with all applicable requirements of federal or state law with respect to such securities.

8. Dividend Equivalents. If the Company pays cash or stock dividends on the Common Stock, an amount equal to (a) the dollar amount of such cash dividend or (ii) the Fair Market Value of such stock dividend will be credited to a dividend equivalent account on behalf of the Grantee with respect to the Time Restricted Stock Unit Award. Credits on account of cash dividends will be held uninvested and will not accrue interest. Credits on account of stock dividends will be deemed to be reinvested in shares of Common Stock. All dividend equivalents will be paid in cash if and when the corresponding Restricted Stock Units are settled. No dividend equivalents will be accrued or paid on Performance Restricted Stock Units.

9. Incorporation of Plan and LTIP. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan and the LTIP, including the powers of the Committee set forth in the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein. The terms of the Plan and the LTIP shall not be considered an enlargement of any benefits under this Agreement. In addition, the Award is subject to any rules and regulations promulgated by the Committee. However, any Award subject to this Agreement may not in any way be restricted or limited by any Plan amendment or termination or by change of Committee rules and regulations approved after the Grant Date without the Grantee’s written consent.

10. Transferability. This Agreement (and the underlying Restricted Stock Units) is personal to the Grantee, is non-assignable, and is not transferable in any manner, by operation of law or otherwise, other than (i) by will or the laws of descent and distribution or (ii) pursuant to an order issued under state domestic relations laws.

11. Shareholder Rights. Neither the Grantee nor any person claiming through the Grantee shall have any rights as a stockholder with respect to any Restricted Stock Units, unless and until the Grantee has become the holder of record of the Shares, all conditions with respect to the issuance of the Shares have been satisfied in full, and the Shares shall have been issued and delivered to the Grantee.

12. Tax Withholding. Except as otherwise provided in this Agreement, the Grantee shall, not later than the date as of which the receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Committee for

3

payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. Except as otherwise provided in this Agreement, the Company shall have the authority to cause the required minimum tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Common Stock to be issued or released by the transfer agent a number of Shares with an aggregate Fair Market Value that would satisfy the withholding amount due.

13. Section 409A. The Restricted Stock Units are intended to be exempt from, or compliant with, Section 409A of the Code and shall be interpreted accordingly.

14. Fractional Shares. Fractional Shares will not be issued.

15. Adjustments. If at any time while the Award is outstanding, the number of outstanding Shares is changed by reason of reorganization, recapitalization, stock split, or any other event that affects the number and kind of Restricted Stock Units, the number and kind of Restricted Stock Units will be adjusted in accordance with the provisions of the Plan.

16. Governing Law. This Agreement shall be governed by the laws of the Commonwealth of Pennsylvania, other than its choice of law provisions.

17. Conflicts. In the event of any conflict between the provisions of the Plan and the provisions of this Agreement, the provisions of the Plan shall govern.

18. Grantee Bound by Plan. By accepting this Agreement, the Grantee hereby acknowledges receipt of a copy of the prospectus and Plan document and agrees to be bound by all the terms and provisions thereof.

19. No Obligation to Continue Service. Neither the Company nor any affiliate is obligated by or as a result of the Plan or this Agreement to continue the Grantee in service and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any affiliate to terminate the service of the Grantee at any time.

20. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

21. Force and Effect. The various provisions of this Agreement are severable in their entirety. Any determination of invalidity or unenforceability of any one provision shall have no effect on the continuing force and effect of the remaining provisions.

22. Successors. This Agreement shall be binding upon and inure to the benefit of the successors, assigns, and heirs of the respective parties.

4

23. Entire Agreement. This Agreement contains the entire understanding of the parties and shall not be modified or amended except in writing and duly signed by the parties. No waiver by either party of any default under this Agreement shall be deemed a waiver of any later default.

5

---

## EX-10.3

SEC source: [exhibit103formofrestricted.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit103formofrestricted.htm)

S&T BANCORP, INC.

2021 INCENTIVE PLAN

RESTRICTED STOCK UNIT AWARD AGREEMENT

1. Award of Restricted Stock Units. Pursuant to the S&T Bancorp, Inc. 2021 Incentive Plan (the “Plan”), S&T Bancorp, Inc. (the “Company”) hereby grants a Restricted Stock Unit Award to the Grantee (the “Award”). Upon acceptance of this Award, the Grantee shall receive the Share Amount, as set forth below, as approved by the Company’s Nominating and Corporate Governance Committee of the Board of Directors (the “Board”) and the Board, subject to the restrictions and conditions set forth in the Plan and this Restricted Stock Unit Award Agreement (this “Agreement”).

2. Acceptance of Award. The Grantee shall have no rights with respect to this Award unless he or she shall have accepted this Award.

3. Restrictions and Conditions. Restricted Stock Units granted herein are subject to restrictions as set forth in the Plan and this Agreement.

4. Vesting of Restricted Stock Units. Except as otherwise provided in this Agreement, Restricted Stock Units covered by the Award shall become vested upon occurrence of the applicable Vesting Date shown below.

5. Death, Disability, or Retirement. Notwithstanding anything in this Agreement to the contrary, if the Grantee’s service with the Company terminates before the Vesting Date on account of death, disability, retirement from the Board in accordance with the mandatory retirement provisions provided in the Company’s by-laws, as appropriate, or attainment of Director Emeritus status, the Award, to the extent not already vested, shall be immediately 100% vested as of the date of such termination on account of death, disability, retirement or attainment of Director Emeritus status.

6. Forfeiture. Except as otherwise provided in this Agreement, termination for cause or upon breach of a restrictive covenant shall result in forfeiture of the Award (unvested). However, if the Grantee should terminate service from the Company prior to full vesting of any portion of the Award for any reason other than death or disability, or retirement from the Board in accordance with the mandatory retirement provisions provided in the Company’s by-laws, as appropriate, participation will cease as of the effective date of termination, and the Award, to the extent not previously vested, shall be forfeited. The Compensation Committee’s (the “Committee”) determination of the reason for termination of the Grantee’s service shall be conclusive and binding on the Grantee and his or her representatives or legatees. For purposes of this section, “cause” shall mean, as determined by the Committee: (i) failure to substantially perform duties as reasonably assigned hereunder (other than by reason of disability), after reasonable written demand for substantial performance has been delivered by the Company specifically identifying the manner in which the Company believes

Grantee has not performed Grantee’s duties, and Grantee has been given a reasonable opportunity (not to exceed fifteen (15) days) to cure any deficiencies in performance; (ii) willful misconduct that demonstrably results in material injury to the Company or their affiliates; (iii) fraud, dishonesty or willful breach of fiduciary duty that is injurious to the Company or their affiliates; (iv) conviction or plea of guilty or nolo contendere to any felony or crime involving moral turpitude, fraud or dishonesty; (v) willful violation of any law, rule or regulation (other than traffic violations, misdemeanors or similar offenses) or cease-and-desist order, court order, judgment or supervisory agreement that demonstrably results in material injury to the Company or their affiliates; or (vi) a material breach by Grantee of (A) Grantee’s obligations under this Agreement or (B) any material written policy of the Company or their affiliates and, if the breach is curable, Grantee shall not have cured such material breach after reasonable written demand for cure has been delivered by the Company specifically identifying the material breach, and Grantee has been given a reasonable opportunity (not to exceed fifteen (15) days) to cure any such material breach (to the extent curable).

7. Settlement of Restricted Stock Units.

(a) The Restricted Stock Units shall be settled by the Company delivering to the Grantee (or after the Grantee’s death, the Grantee’s beneficiary), on the applicable scheduled settlement date a number of Shares equal to the number of Restricted Stock Units vested as of such date, together with any related Dividend Equivalents (as defined below).

(b) For purposes of this Agreement, the “scheduled settlement date” shall be as soon as administratively feasible following the Vesting Date; provided that, the scheduled settlement date shall be no later than March 15 of the calendar year following the year in which the underlying Restricted Stock Unit vests.

(c) The delivery of any Shares may be postponed by the Company for such period as may be required for it to comply with any applicable foreign, federal, state, or provincial securities law, or any national securities exchange listing requirements, and the Company is not obligated to issue or deliver any Shares if, in the opinion of counsel for the Company, such issuance or delivery constitutes a violation by the Grantee or the Company of any provisions of any applicable foreign, federal, state, or provincial securities law or of any regulations of any governmental authority or any national securities exchange. For the avoidance of doubt, the grant of the Restricted Stock Units and the issuance of any Shares pursuant to this Agreement shall be subject to compliance with all applicable requirements of federal or state law with respect to such securities.

8. Dividend Equivalents. If the Company pays cash or stock dividends on the Common Stock, an amount equal to (a) the dollar amount of such cash dividend or (ii) the Fair Market Value of such stock dividend will be credited to a dividend equivalent account on behalf of the Grantee with respect to the Restricted Stock Unit Award. Credits on account of cash dividends will be held uninvested and will not accrue interest. Credits on account of stock dividends will be deemed to be

2

reinvested in shares of Common Stock. All dividend equivalents will be paid in cash if and when the corresponding Restricted Stock Units are settled.

9. Incorporation of Plan. Notwithstanding anything herein to the contrary, this Agreement shall be subject to and governed by all the terms and conditions of the Plan, including the powers of the Committee set forth in the Plan. Capitalized terms in this Agreement shall have the meaning specified in the Plan, unless a different meaning is specified herein. The terms of the Plan shall not be considered an enlargement of any benefits under this Agreement. In addition, the Award is subject to any rules and regulations promulgated by the Committee. However, any Award subject to this Agreement may not in any way be restricted or limited by any Plan amendment or termination or by change of Committee rules and regulations approved after the Grant Date without the Grantee’s written consent.

10. Transferability. This Agreement (and the underlying Restricted Stock Units) is personal to the Grantee, is non-assignable, and is not transferable in any manner, by operation of law or otherwise, other than (i) by will or the laws of descent and distribution or (ii) pursuant to an order issued under state domestic relations laws.

11. Shareholder Rights. Neither the Grantee nor any person claiming through the Grantee shall have any rights as a stockholder with respect to any Restricted Stock Units, unless and until the Grantee has become the holder of record of the Shares, all conditions with respect to the issuance of the Shares have been satisfied in full, and the Shares shall have been issued and delivered to the Grantee.

12. Tax Withholding. Except as otherwise provided in this Agreement, the Grantee shall, not later than the date as of which the receipt of this Award becomes a taxable event for Federal income tax purposes, pay to the Company or make arrangements satisfactory to the Committee for payment of any Federal, state, and local taxes required by law to be withheld on account of such taxable event. Except as otherwise provided in this Agreement, the Company shall have the authority to cause the required minimum tax withholding obligation to be satisfied, in whole or in part, by withholding from shares of Common Stock to be issued or released by the transfer agent a number of Shares with an aggregate Fair Market Value that would satisfy the withholding amount due.

13. Section 409A. The Restricted Stock Units are intended to be exempt from, or compliant with, Section 409A of the Code and shall be interpreted accordingly.

14. Fractional Shares. Fractional Shares will not be issued.

15. Adjustments. If at any time while the Award is outstanding, the number of outstanding Shares is changed by reason of reorganization, recapitalization, stock split, or any other event that affects the number and kind of Restricted Stock Units, the number and kind of Restricted Stock Units will be adjusted in accordance with the provisions of the Plan.

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16. Governing Law. This Agreement shall be governed by the laws of the Commonwealth of Pennsylvania, other than its choice of law provisions.

17. Conflicts. In the event of any conflict between the provisions of the Plan and the provisions of this Agreement, the provisions of the Plan shall govern.

18. Grantee Bound by Plan. By accepting this Agreement, the Grantee hereby acknowledges receipt of a copy of the prospectus and Plan document and agrees to be bound by all the terms and provisions thereof.

19. No Obligation to Continue Service. Neither the Company nor any affiliate is obligated by or as a result of the Plan or this Agreement to continue the Grantee in service and neither the Plan nor this Agreement shall interfere in any way with the right of the Company or any affiliate to terminate the service of the Grantee at any time.

20. Notices. Notices hereunder shall be mailed or delivered to the Company at its principal place of business and shall be mailed or delivered to the Grantee at the address on file with the Company or, in either case, at such other address as one party may subsequently furnish to the other party in writing.

21. Force and Effect. The various provisions of this Agreement are severable in their entirety. Any determination of invalidity or unenforceability of any one provision shall have no effect on the continuing force and effect of the remaining provisions.

22. Successors. This Agreement shall be binding upon and inure to the benefit of the successors, assigns, and heirs of the respective parties.

23. Entire Agreement. This Agreement contains the entire understanding of the parties and shall not be modified or amended except in writing and duly signed by the parties. No waiver by either party of any default under this Agreement shall be deemed a waiver of any later default.

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## EX-31.1

SEC source: [exhibit311.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit311.htm)

Exhibit 31.1

CERTIFICATION

I, Christopher J. McComish, certify that:

1.I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation;

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 6, 2026

/s/ Christopher J. McComish

Christopher J. McComish, Chief Executive Officer (Principal Executive Officer)

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## EX-31.2

SEC source: [exhibit312.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit312.htm)

Exhibit 31.2

CERTIFICATION

I, Mark Kochvar, certify that:

1.I have reviewed this quarterly report on Form 10-Q of S&T Bancorp, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures as of the end of the period covered by this report based on such evaluation;

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 6, 2026

/s/ Mark Kochvar

Mark Kochvar, Chief Financial Officer (Principal Financial Officer)

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## EX-32

SEC source: [exhibit32.htm](https://www.sec.gov/Archives/edgar/data/719220/000071922026000098/exhibit32.htm)

Exhibit 32

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

AND CHIEF FINANCIAL OFFICER

SARBANES-OXLEY ACT SECTION 906

Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in connection with the S&T Bancorp, Inc. (the “Company”) Quarterly Report on Form 10-Q for the period ended June 30, 2026 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Christopher J. McComish, Chief Executive Officer of the Company, and I, Mark Kochvar, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to the best of my knowledge that:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company for the dates and period covered by the Report.

This certificate is being made for the exclusive purpose of compliance by the Chief Executive Officer and Chief Financial Officer of the Company with the requirements of Section 906 of the Sarbanes-Oxley Act of 2002, and may not be disclosed, distributed or used by any person or for any reason other than as specifically required by law.

Date: August 6, 2026

/s/ Christopher J. McComish /s/ Mark Kochvar

Christopher J. McComish, Chief Executive Officer (Principal Executive Officer) Mark Kochvar, Chief Financial Officer (Principal Financial Officer)