S&T Bancorp STBA Form 10-Q filing Q1 FY2026

Item 1. Condensed Consolidated Financial Statements

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(Unaudited)

• (Unaudited)
• (Audited)_

See Notes to Consolidated Financial Statements

See Notes to Consolidated Financial Statements

S&T BANCORP, INC. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY

(Unaudited)

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO 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 CONSOLIDATED FINANCIAL STATEMENTS

Recently Adopted Accounting Standards Updates, or ASU, or Updated

There were no recently adopted accounting standards updates in the first 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 period 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 months ended March 31, 2026 and 2025.

The following table reconciles the numerators and denominators of basic and diluted EPS calculations for the periods presented:

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO 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 months ended March 31, 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 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:

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO 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 March 31, 2026, individually evaluated loans of $1.7 million were measured at fair value on a nonrecurring basis and classified as Level 3 and individually evaluated loans of $1.2 million were measured at fair value and classified as Level 2. 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 as of both March 31, 2026 and December 31, 2025.

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

Fair Value of Financial Instruments

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

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 4. SECURITIES

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

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

(1) Excludes interest receivable of $3.2 million at March 31, 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 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:

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 March 31, 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 March 31, 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 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:

The amortized cost and fair value of available-for-sale debt securities at March 31, 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.

Debt securities are pledged in order to meet various regulatory and legal requirements. Restricted pledged securities had a carrying value of $37.2 million at March 31, 2026 and $38.3 million at December 31, 2025. Unrestricted pledged securities had a carrying value of $208.0 million at March 31, 2026 and $202.0 million at December 31, 2025. Any sales 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 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 $4.1 million at March 31, 2026 and $4.8 million at December 31, 2025 and a discount related to purchase accounting fair value adjustments of $1.9 million at March 31, 2026 and $2.0 million at December 31, 2025.

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

(1) Excludes interest receivable of $32.4 million at March 31, 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:

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

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:

A payment default is defined as a loan having a payment past due 90 days or more. There was one payment default on previously modified loans to borrowers experiencing financial difficulty in the amount of $3.4 million during the three months ended March 31, 2026 compared to one payment default in the amount of $3.8 million during the same period in 2025. Additionally, we had thirteen commitments to lend an additional $1.3 million to borrowers experiencing financial difficulty that had a modification during the twelve months ended March 31, 2026 and ten commitments to lend an additional $0.5 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 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 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.

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

The following tables present loan balances by year of origination and internally assigned risk rating for our portfolio segments at the dates presented:

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

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

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

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

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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

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

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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:

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:

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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 $1.8 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:

NOTE 7. TAX CREDIT EQUITY INVESTMENTS

We invest in 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 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 months ended March 31, 2026 and 2025.

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

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:

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

S&T BANCORP, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

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:

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.

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:

NOTE 10. SHARE REPURCHASE PLAN

On January 21, 2026, the Board of Directors of S&T Bancorp, Inc. authorized a new $100.0 million share repurchase program. The repurchase authorization permits 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 March 31, 2026, there was $50.4 million in capacity remaining under the plan.

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

NOTE 11. SUBSEQUENT EVENTS

Subsequent to March 31, 2026, 354,200 shares were repurchased at an average price of $44.29 per share for $15.7 million excluding excise tax and commissions. At May 5, 2026, there was $34.7 million in capacity remaining under the repurchase plan authorized on January 21, 2026.

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 months ended March 31, 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.

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 March 31, 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.

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 shareholder's equity to average tangible shareholders' equity for the periods presented:

Executive Overview

We are a bank holding company that is headquartered in Indiana, Pennsylvania with assets of $9.9 billion at March 31, 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:

We recognized net income of $35.1 million, or $0.94 per diluted share, for the three months ended March 31, 2026 compared to net income of $33.4 million, or $0.87 per diluted share, for the same period in 2025. This represents a 5.0 percent increase in net income and an 8.0 percent increase in diluted earnings per share for the three months ended March 31, 2026 compared to the same period in 2025. During the first quarter of 2026, 1,146,100 shares were repurchased at an average price of $43.30 per share for $49.6 million excluding excise tax and commissions. Total share repurchases for both the fourth quarter of 2025 and the first quarter of 2026 were 2,094,370 shares at an average price of $40.99 per share totaling $85.8 million excluding excise tax and commissions. The remaining capacity under the existing share repurchase program was $50.4 million at March 31, 2026.

Net interest income increased $5.1 million, or 6.1 percent to $88.4 million for the three months ended March 31, 2026 compared to $83.3 million for the same period in 2025. The net interest margin, or NIM, on an FTE basis (non-GAAP) increased 11 basis points to 3.92 percent for the three months ended March 31, 2026 compared to 3.81 percent for the same period in 2025. The increases in 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 funding mix due to strong customer growth which allowed for reduced levels of brokered deposits and borrowings.

S&T BANCORP, INC. AND SUBSIDIARIES

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

The provision for credit losses increased $4.3 million to $1.3 million for the three months ended March 31, 2026 compared to negative $3.0 million for the same period in 2025. The increase was primarily due to higher net loan charge-offs and an increase in specific reserve for loans individually evaluated compared to the same period in 2025.

Noninterest income increased $3.2 million to $13.6 million for the three months ended March 31, 2026 compared to the same period in 2025. The increase was mainly related to $2.3 million in realized losses from the repositioning of securities into longer duration, higher-yielding securities which occurred in 2025 and is not present in 2026. Noninterest expense increased $1.6 million to $56.7 million for the three months ended March 31, 2026 compared to $55.1 million in the same period in 2025. The increase in noninterest expense primarily related to higher salaries and employee benefits of $1.5 million related to increased salary, medical and incentive costs.

The provision for income taxes increased $0.7 million to $9.0 million for the three months ended March 31, 2026 compared to $8.3 million for the same period in 2025. Our effective tax rate was 20.4 percent for the three months ended March 31, 2026 compared to 19.9 percent for the three months ended March 31, 2025. The increase in our effective tax rate for the three month period ended March 31, 2026 was primarily due to an increase in pretax income and state income tax expense compared to the same period in 2025.

S&T BANCORP, INC. AND SUBSIDIARIES

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

Three months ended March 31, 2026 compared to Three months ended March 31, 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

(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 $5.1 million, or 6.06 percent, for the three months ended March 31, 2026 compared to the same period in 2025. The net interest margin, or NIM, on an FTE basis (non-GAAP) increased 11 basis points to 3.92 percent for the three months ended March 31, 2026 compared to 3.81 percent in the same period in 2025. The increases in 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.

Interest income on an FTE basis (non-GAAP) increased $1.5 million for the three months ended March 31, 2026 compared to the same period in 2025. The increase in interest income on an FTE basis (non-GAAP) was primarily driven by a $245.7 million increase in total portfolio loans that more than offset the impact of declining loan yields. The average yield on loans decreased 13 basis points compared to the same period in 2025 due to lower interest rates. Interest income on an FTE basis (non-GAAP) also improved due to an increase in securities yield of 19 basis points to 3.78 percent compared to 3.59 percent in the same period in 2025. Overall, the FTE rate (non-GAAP) on interest-earning assets decreased 10 basis points for the three months ended March 31, 2026 compared to the same period in 2025.

S&T BANCORP, INC. AND SUBSIDIARIES

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

Interest expense decreased $3.6 million for the three months ended March 31, 2026 compared to the same period in 2025. The decrease in interest expense was primarily due to a decline in interest rates. Average interest-bearing deposits increased $250.4 million for the three months ended March 31, 2026 compared to the same period in 2025. Average borrowings decreased $43.6 million for the three months ended March 31, 2026 compared to the same period in 2025 primarily due to an increase in deposits. Overall, the cost of interest-bearing liabilities decreased 33 basis points for the three months ended March 31, 2026 compared to the same period in 2025.

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

(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.

Provision for Credit Losses

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

The provision for credit losses increased $4.3 million to $1.3 million for the three months ended March 31, 2026 compared to negative $3.0 million for the same period in 2025. The increase was primarily due to higher net loan charge-offs and an increase in specific reserve for loans individually evaluated.

Net loan charge-offs were $1.7 million for the three months ended March 31, 2026 compared to net loan charge-offs of $0.0 million for the same period in 2025. Refer to the "Allowance for Credit Losses" section of this MD&A for further details.

S&T BANCORP, INC. AND SUBSIDIARIES

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

Noninterest Income

Noninterest income increased $3.2 million to $13.6 million for the three months ended March 31, 2026 compared to the same period in 2025. The increase was mainly related to $2.3 million in realized losses from the repositioning of securities into longer duration, higher-yielding securities which occurred in 2025 and is not present in 2026.

Noninterest Expense

Noninterest expense increased $1.6 million to $56.7 million for the three months ended March 31, 2026 compared to the same period in 2025. The increase in noninterest expense mainly related to higher salaries and employee benefits of $1.5 million primarily due to increased salary, medical and incentive costs. Other taxes increased $0.6 million primarily due to the timing of contributions to the Educational Improvement Tax Credit Program and other noninterest expense decreased $0.8 million primarily due to the same contribution timing. These contributions are reported in other expense and generate tax credits that reduce shares tax expense, which is included in other taxes.

Provision for Income Taxes

The provision for income taxes increased $0.7 million to $9.0 million for the three months ended March 31, 2026 compared to $8.3 million for the same period in 2025. Our effective tax rate was 20.4 percent for the three months ended March 31, 2026 compared to 19.9 percent for the for the three months ended March 31, 2025. The increase in our effective tax rate for the three months ended March 31, 2026 was primarily due to an increase in pretax income and state income tax expense compared to the same period in 2025.

Financial Condition at March 31, 2026

Total assets were $9.9 billion at both March 31, 2026 and December 31, 2025. Cash and due from banks increased $175.6 million related to a significant increase in deposits and a decline in loans compared to December 31, 2025. Total portfolio loans decreased $112.6 million, or 1.4 percent, to $8.0 billion at March 31, 2026 compared to December 31, 2025. The commercial loan portfolio decreased $79.0 million and the consumer loan portfolio decreased $33.6 million compared to December 31, 2025. The decline in loans related to lower fundings, reduced utilization and higher commercial real estate loan payoffs.

Securities increased $21.9 million to $1.0 billion at March 31, 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. The securities portfolio was in a net unrealized loss position of $42.7 million at March 31, 2026 compared to a net unrealized loss position of $34.9 million at December 31, 2025.

Total deposits increased $226.4 million, or 2.8 percent, to $8.2 billion at March 31, 2026 compared to $8.0 billion at December 31, 2025. Customer deposits increased $306.5 million, or 3.9 percent, to $8.1 billion at March 31, 2026 compared to $7.8 billion at December 31, 2025 driven by broad-based growth across all lines of business and nearly all deposit product

S&T BANCORP, INC. AND SUBSIDIARIES

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

categories. The increase in customer deposits allowed for a reduction in brokered deposits which decreased $80.1 million to $100.3 million at March 31, 2026 compared to $180.4 million at December 31, 2025.

Total borrowings decreased $115.0 million to $150.3 million at March 31, 2026 compared to $265.3 million at December 31, 2025 due to strong customer deposit growth.

Total shareholders’ equity decreased by $33.2 million to $1.4 billion at March 31, 2026 compared to December 31, 2025. The decrease was primarily due to repurchases of S&T common stock of $50.2 million which includes excise tax and commissions of $0.6 million, other comprehensive loss of $5.8 million and dividends of $13.4 million offset by net income of $35.1 million. During the first quarter of 2026, 1,146,100 common shares were repurchased at an average price of $43.30 per share.

Securities Activity

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

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 $21.9 million to $1.0 billion at March 31, 2026 compared to December 31, 2025. The increase in the debt securities portfolio was primarily related to purchases offset by an increase in unrealized losses of $7.8 million at March 31, 2026 compared to December 31, 2025 as a result of higher interest rates. Our debt securities portfolio was in a net unrealized loss position of $42.7 million at March 31, 2026 compared to a net unrealized loss position of $34.9 million at December 31, 2025. At March 31, 2026, our debt securities portfolio had gross unrealized losses of $46.3 million offset by $3.6 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.

Loan Composition

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

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.

S&T BANCORP, INC. AND SUBSIDIARIES

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

Total portfolio loans were $8.0 billion at March 31, 2026 compared to $8.1 billion at December 31, 2025. The decline in commercial loans related to reduced utilization rates and higher commercial real estate loan payoffs. Additionally, we experienced increased competition in pricing and loan structure which contributed to lower-than-anticipated new fundings for the three months ended March 31, 2026.

Commercial loans, including CRE, C&I and commercial construction comprised 68.4 percent of total portfolio loans at March 31, 2026 compared to 68.5 percent at December 31, 2025. The commercial loan portfolio decreased $79.0 million at March 31, 2026 compared to December 31, 2025 due to decreases of $94.7 million in CRE and $8.3 million in C&I offset by an increase of $23.9 million in commercial construction.

Consumer loans represent 31.6 percent of our total portfolio loans at March 31, 2026 compared to 31.5 percent at December 31, 2025. The consumer loan portfolio decreased $33.6 million at March 31, 2026 compared to December 31, 2025 due to decreases of $26.2 million in consumer real estate and $7.3 million in other consumer loans. At both March 31, 2026 and December 31, 2025, 23 percent of our total loans were adjustable rate, 37 percent were floating rate and 40 percent were fixed rate.

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.

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

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

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

The ACL increased $0.1 million to $93.3 million, or 1.17 percent of total portfolio loans, at March 31, 2026 compared to $93.2 million, or 1.15 percent of total portfolio loans, at December 31, 2025. The increase in the ACL and ACL as a percentage of total portfolio loans was primarily due to an increase of $1.0 million in specific reserves for loans individually evaluated and higher special mention loans which was partially offset by lower substandard and total loan balances.

Substandard loans decreased $10.5 million to $114.6 million at March 31, 2026 compared to $125.1 million at December 31, 2025. The decrease in the amount of substandard loans was primarily due to loan paydowns. Special mention loans increased $57.8 million to $126.8 million at March 31, 2026 compared to $69.0 million at December 31, 2025. The increase in special mention loans was related to downgrades of three C&I relationships and one CRE relationship.

S&T BANCORP, INC. AND SUBSIDIARIES

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

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

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 $5.7 million to $49.9 million at March 31, 2026 compared to $55.6 million at December 31, 2025. The decrease in nonaccrual loans was primarily due to paydowns in the C&I 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:

Total deposits increased $226.4 million, or 2.8 percent, at March 31, 2026 compared to December 31, 2025 as a result of our continued focus on growing our deposit franchise. Customer deposits increased $306.5 million, or 3.9 percent, compared to December 31, 2025, driven by broad-based growth across all lines of business and nearly all product categories. While most of this increase reflects growth in our customer deposit base, a portion relates to seasonality and temporary inflows that are not expected to remain. Growth in customer deposits also enabled a reduction in brokered deposits, which decreased $80.1 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 $330.4 million at March 31, 2026 compared to $317.3 million at December 31, 2025.

We had total uninsured deposits of $2.9 billion, or 35.8 percent of our total deposit base, at March 31, 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 FHLB Advances. Long-term borrowings are for original terms greater than one year and are comprised of FHLB advances and finance leases. Total borrowings decreased $115.0 to $150.3 million at March 31, 2026 compared to $265.3 million at December 31, 2025 due to strong customer deposit growth and lower loan balances.

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

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

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 three months ended March 31, 2026 and for the twelve months ended December 31, 2025:

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 March 31, 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 March 31, 2026. The following table summarizes funding sources available at the dates presented:

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

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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 March 31, 2026, S&T Bank had $1.0 billion in highly liquid assets which consisted primarily of $276.0 million in interest-bearing deposits with banks and $763.0 million in unpledged securities. This resulted in a highly liquid assets to total assets ratio of 10.5 percent at March 31, 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:

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 March 31, 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:

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 scenarios when comparing March 31, 2026 to December 31, 2025 primarily because of temporary increased cash levels which were used to reduce wholesale funding. The remaining impact is due to increased floating rate loans and upcoming maturities within our receive-fixed balance sheet swap portfolio. The percentage change in pretax net interest income in the 1-12 month rates down scenarios remain relatively unchanged when comparing March 31, 2026 to December 31, 2025. Our rate shock analyses remain relatively unchanged in the percentage change in pretax net interest income in the 13-24 month scenarios when comparing March 31, 2026 to December 31, 2025. Our EVE analyses remain relatively unchanged in the

S&T BANCORP, INC. AND SUBSIDIARIES

Item 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

percentage change in pretax net interest income in the 13-24 month scenarios when comparing March 31, 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 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 March 31, 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 March 31, 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

The following table is a summary of our purchases of common stock during the first quarter of 2026:

(1) Excludes excise tax and commissions.

On January 21, 2026, our Board of Directors authorized a new $100 million share repurchase program effective January 26, 2026 which is set to expire February 1, 2027. 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. At March 31, 2026, 1,146,100 shares were repurchased under the new plan, at an average price of $43.30 per share, for $49.6 million excluding excise tax and commissions.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not Applicable.

Item 5. Other Information

(c) During the three months ended March 31, 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.

S&T BANCORP, INC. AND SUBSIDIARIES

Item 6. Exhibits

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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 10.1 Employment Agreement, dated April 2, 2026, by and between S&T Bancorp, Inc. and Christopher J. McComish. Filed as Exhibit 10.1 to S&T Bancorp, Inc. Current Report on Form 8-K filed on April 6, 2026, and incorporated herein by reference.* 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)

S&T BANCORP, INC. AND SUBSIDIARIES