# Sotera Health (SHC) 10-Q SEC filing - Q3 FY2026

- Filed: Aug 6, 2026, 4:04 PM EDT
- Fiscal quarter: Q3 FY2026
- Calendar quarter: Q3 2026
- Accession: 0001822479-26-000047
- OpenCapital page: https://www.opencapital.sh/filings/0001822479-26-000047
- Markdown URL: https://www.opencapital.sh/filings/0001822479-26-000047.md
- Official SEC filing index: https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/0001822479-26-000047-index.htm

## Filing documents

- [10-Q (shc-20260630.htm)](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc-20260630.htm)
- [EX-10.2 (shc_20260630xexhibitx10x2.htm)](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx10x2.htm)
- [EX-10.3 (shc_20260630xexhibitx10x3.htm)](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx10x3.htm)
- [EX-31.1 (shc_20260630xexhibitx31x1.htm)](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx31x1.htm)
- [EX-31.2 (shc_20260630xexhibitx31x2.htm)](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx31x2.htm)
- [EX-32.1 (shc_20260630xexhibitx32x1.htm)](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx32x1.htm)

---

## 10-Q

SEC source: [shc-20260630.htm](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc-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 001-39729

### SOTERA HEALTH COMPANY

(Exact name of registrant as specified in its charter)

|  |  |
| --- | --- |
| Delaware | 47-3531161 |
| (State or other jurisdiction of incorporation or organization) | (I.R.S. Employer Identification No.) |
| 9100 South Hills Blvd, Suite 300 |  |
| Broadview Heights, Ohio | 44147 |
| (Address of principal executive offices) | (Zip Code) |
| (440) 262-1410 |  |
| (Registrant’s telephone number, including area code) |  |

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, $0.01 par value per share SHC The Nasdaq Stock Market LLC

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

As of July 30, 2026, there were 285,374,795 shares of the registrant’s common stock, $0.01 par value per share, outstanding.

### SOTERA HEALTH COMPANY

- TABLE OF CONTENTS -

[Part I—FINANCIAL INFORMATION](#i99a0eea5510f4d469c84e2501614122e_13) [5](#i99a0eea5510f4d469c84e2501614122e_13)

[Item 1. Financial Statements](#i99a0eea5510f4d469c84e2501614122e_16)[.](#i99a0eea5510f4d469c84e2501614122e_16) [5](#i99a0eea5510f4d469c84e2501614122e_16)

[Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations](#i99a0eea5510f4d469c84e2501614122e_85)[.](#i99a0eea5510f4d469c84e2501614122e_85) [27](#i99a0eea5510f4d469c84e2501614122e_85)

[Item 3. Quantitative and Qualitative Disclosures About Market Risk](#i99a0eea5510f4d469c84e2501614122e_109)[.](#i99a0eea5510f4d469c84e2501614122e_109) [39](#i99a0eea5510f4d469c84e2501614122e_109)

[Item 4. Controls and Procedures](#i99a0eea5510f4d469c84e2501614122e_112)[.](#i99a0eea5510f4d469c84e2501614122e_112) [39](#i99a0eea5510f4d469c84e2501614122e_112)

[Part II—OTHER INFORMATION](#i99a0eea5510f4d469c84e2501614122e_115) [40](#i99a0eea5510f4d469c84e2501614122e_115)

[Item 1. Legal Proceedings.](#i99a0eea5510f4d469c84e2501614122e_118) [40](#i99a0eea5510f4d469c84e2501614122e_118)

[Item 1A. Risk Factors.](#i99a0eea5510f4d469c84e2501614122e_121) [40](#i99a0eea5510f4d469c84e2501614122e_121)

[Item 5. Other Information](#i99a0eea5510f4d469c84e2501614122e_124)[.](#i99a0eea5510f4d469c84e2501614122e_124) [40](#i99a0eea5510f4d469c84e2501614122e_124)

[Item 6. Exhibits.](#i99a0eea5510f4d469c84e2501614122e_127) [41](#i99a0eea5510f4d469c84e2501614122e_127)

[SIGNATURES](#i99a0eea5510f4d469c84e2501614122e_130) [42](#i99a0eea5510f4d469c84e2501614122e_130)

### CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q includes “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are often characterized by the use of words such as “believes,” “estimates,” “expects,” “projects,” “may,” “intends,” “plans” or “anticipates,” or by discussions of strategy, plans or intentions. Such forward-looking statements involve known and unknown risks, uncertainties and other important factors that could cause our actual results, performance, achievements, or industry results, to differ materially from historical results or any future results, performance or achievements expressed, suggested or implied by such forward-looking statements. Such risks and uncertainties include, but are not limited to:

- a disruption in the availability or supply of, or increases in the price of, ethylene oxide (“EO”), Cobalt-60 (“Co-60”) or our other direct materials, services and supplies, including as a result of geopolitical instability and/or sanctions against Russia by the United States, Canada, the United Kingdom and/or the European Union, or sanctions by Russia against those countries;
- fluctuations in foreign currency exchange rates;
- evolving changes in environmental, health and safety regulations;
- health and safety risks associated with the use, storage, transportation and disposal of potentially hazardous materials such as EO and Co-60;
- the impact and outcome of current and future legal proceedings and liability claims, including litigation related to the use, emissions and releases of EO from our current and former EO sterilization facilities, and the possibility that additional claims will be made in the future;
- allegations of our failure to properly perform services and potential product liability claims, recalls, penalties and reputational harm;
- compliance with the extensive regulatory requirements to which we are subject, the related costs, and any failures to receive or maintain, or delays in receiving, required clearances or approvals;
- adverse changes in industry trends;
- competition we face;
- market conditions and changes, including inflationary trends and the impact of tariffs, that impact our long-term supply contracts with variable price clauses and increase our cost of revenues;
- business continuity hazards, including supply chain disruptions, federal government shutdowns, and other risks associated with our operations;
- the risks of doing business internationally, including global and regional economic and political instability and compliance with various applicable laws and potentially inconsistent laws and regulations in multiple jurisdictions;
- our ability to increase capacity at existing facilities, build new facilities in a timely and cost-effective manner and renew leases for our leased facilities;
- our ability to attract and retain qualified employees;
- severe health events or environmental events;
- cybersecurity incidents, unauthorized data disclosures, and our dependence on information technology (“IT”) systems;
- the risks associated with the introduction of artificial intelligence (“AI”) technology;
- an inability to pursue strategic transactions, find suitable acquisition targets, or integrate strategic acquisitions into our business successfully;
- our ability to maintain effective internal control over financial reporting;
- our reliance on intellectual property rights to maintain our competitive position and the risk of claims from third parties that we have infringed or misappropriated, or are infringing or misappropriating, their intellectual property rights;
- our ability to comply with rapidly evolving data privacy and security laws and regulations in various jurisdictions and any ineffective compliance efforts with such laws and regulations;
- our ability to generate profitability in future periods;
- impairment charges on our goodwill and other intangible assets with indefinite lives, as well as other long-lived assets and intangible assets with definite lives;
- the effects of unionization efforts and labor regulations in countries in which we operate;
- adverse changes to our tax positions in U.S. or non-U.S. jurisdictions or the interpretation and application of U.S. tax legislation or other changes in U.S. or non-U.S. taxation of our operations; and
- our significant degree of leverage and how this leverage could adversely affect our ability to raise additional capital, limit our ability to react to challenges facing our Company or broader changes in our industry or the economy, limit our flexibility in operating our business through restrictions contained in our debt agreements and/or prevent us from meeting our obligations under our existing and future agreements governing our indebtedness.

These forward-looking statements are based on current plans, estimates and projections, and therefore you should not place undue reliance on them. Forward-looking statements speak only as of the date they are made, and we undertake no obligation to update them publicly in light of new information or future events, except as required by law. The inclusion of this forward-looking information should not be regarded as a representation by us or any other person that the future plans, estimates or expectations contemplated by us will be achieved.

You should carefully consider the above factors, as well as the factors discussed elsewhere in this Quarterly Report on Form 10-Q, including under Part II, Item 1A, “Risk Factors,” as well as Part I, Item 1A, “Risk Factors” of our Annual Report on Form 10-K for the year ended December 31, 2025 (the “2025 10-K”). If any of these trends, risks or uncertainties actually occur or continue, our business, financial condition or operating results could be materially adversely affected, the trading prices of our securities could decline and you could lose all or part of your investment. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by this cautionary statement.

Unless expressly indicated or the context requires otherwise, the terms “Sotera Health,” “Company,” “we,” “us,” and “our” in this Quarterly Report on Form 10-Q refer to Sotera Health Company, a Delaware corporation, and, where appropriate, its subsidiaries on a consolidated basis.

### Part I—FINANCIAL INFORMATION

## Item 1. Financial Statements.

**Sotera Health Company**

### Consolidated Balance Sheets

_(in thousands, except per share amounts)_

| Assets | As of / June 30, 2026 / (Unaudited) | As of / December 31, 2025 |
| --- | --- | --- |
| Current assets: |  |  |
| Cash and cash equivalents | $356,716 | $344,621 |
| Restricted cash short-term | 11 | 1,835 |
| Accounts receivable, net of allowance for uncollectible accounts of $2,812 and $2,968, respectively | 150,538 | 139,329 |
| Inventories, net | 56,372 | 54,375 |
| Prepaid expenses and other current assets | 74,739 | 65,250 |
| Income taxes receivable | 8,082 | 8,000 |
| Total current assets | 646,458 | 613,410 |
| Property, plant, and equipment, net | 1,167,667 | 1,130,564 |
| Operating lease assets | 30,919 | 33,393 |
| Deferred income taxes | 3,738 | 3,853 |
| Post-retirement assets | 55,950 | 53,817 |
| Other assets | 40,632 | 36,694 |
| Other intangible assets, net | 270,171 | 288,227 |
| Goodwill | 1,091,255 | 1,103,232 |
| Total assets | $3,306,790 | $3,263,190 |
| Liabilities and equity |  |  |
| Current liabilities: |  |  |
| Accounts payable | $101,018 | $77,963 |
| Accrued liabilities | 83,573 | 124,736 |
| Deferred revenues | 14,212 | 17,999 |
| Current portion of long-term debt | 13,923 | 13,973 |
| Current portion of finance lease obligations | 3,732 | 3,465 |
| Current portion of operating lease obligations | 5,472 | 5,755 |
| Income taxes payable | 9,308 | 5,693 |
| Total current liabilities | 231,238 | 249,584 |
| Long-term debt | 2,125,534 | 2,126,724 |
| Finance lease obligations, less current portion | 91,575 | 93,835 |
| Operating lease obligations, less current portion | 27,853 | 29,901 |
| Noncurrent asset retirement obligations | 54,060 | 53,496 |
| Deferred lease income | 16,185 | 17,057 |
| Post-retirement obligations | 7,742 | 8,123 |
| Noncurrent liabilities | 5,376 | 7,360 |
| Deferred income taxes | 81,579 | 71,075 |
| Total liabilities | 2,641,142 | 2,657,155 |
| See Commitments and contingencies note |  |  |
| Equity: |  |  |
| Common stock, with $0.01 par value, 1,200,000 shares authorized; 286,037 shares issued at June 30, 2026 and December 31, 2025 | 2,860 | 2,860 |
| Preferred stock, with $0.01 par value, 120,000 shares authorized; no shares issued at June 30, 2026 and December 31, 2025 | — | — |
| Treasury stock, at cost (675 shares and 1,666 shares at June 30, 2026 and December 31, 2025, respectively) | (9,288) | (17,013) |
| Additional paid-in capital | 1,267,392 | 1,262,119 |
| Retained deficit | (451,861) | (532,093) |
| Accumulated other comprehensive loss | (143,455) | (109,838) |
| Total equity | 665,648 | 606,035 |
| Total liabilities and equity | $3,306,790 | $3,263,190 |

See notes to consolidated financial statements.

**Sotera Health Company**

### Consolidated Statements of Operations and Comprehensive Income

_(in thousands, except per share amounts) · (Unaudited)_

| Line item | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Revenues: |  |  |  |  |
| Service | $278,325 | $257,244 | $519,933 | $481,184 |
| Product | 43,050 | 37,097 | 81,487 | 67,680 |
| Total net revenues | 321,375 | 294,341 | 601,420 | 548,864 |
| Cost of revenues: |  |  |  |  |
| Service | 126,840 | 113,293 | 245,668 | 220,922 |
| Product | 16,572 | 14,427 | 30,720 | 25,889 |
| Total cost of revenues | 143,412 | 127,720 | 276,388 | 246,811 |
| Gross profit | 177,963 | 166,621 | 325,032 | 302,053 |
| Selling, general and administrative expenses | 68,156 | 68,893 | 136,367 | 131,954 |
| Amortization of intangible assets | 3,015 | 9,298 | 6,046 | 24,625 |
| Illinois EO litigation settlements | — | 34,000 | — | 64,943 |
| Interest expense, net | 34,405 | 40,651 | 69,150 | 81,527 |
| Loss on refinancing of debt | 936 | 80 | 936 | 80 |
| Foreign exchange (gain) loss, net | (3,746) | 627 | (4,317) | 916 |
| Other income, net | (2,854) | (5,825) | (3,814) | (6,066) |
| Income before income taxes | 78,051 | 18,897 | 120,664 | 4,074 |
| Provision for income taxes | 24,408 | 10,935 | 40,432 | 9,372 |
| Net income (loss) | 53,643 | 7,962 | 80,232 | (5,298) |
| Other comprehensive income (loss) net of tax: |  |  |  |  |
| Pension and post-retirement benefits (net of taxes of $(33), $24, $(69), and $27, respectively) | (98) | 71 | (202) | 81 |
| Interest rate derivatives (net of taxes of $403, $(386), $963 and $(652), respectively) | 1,174 | (1,123) | 2,807 | (1,895) |
| Foreign currency translation | (18,591) | 82,217 | (36,222) | 101,777 |
| Comprehensive income | $36,128 | $89,127 | $46,615 | $94,665 |
| Earnings (Loss) per share: |  |  |  |  |
| Basic | $0.19 | $0.03 | $0.28 | $(0.02) |
| Diluted | 0.19 | 0.03 | 0.28 | (0.02) |
| Weighted average number of shares outstanding: |  |  |  |  |
| Basic | 285,773 | 283,933 | 285,333 | 283,747 |
| Diluted | 288,148 | 285,756 | 287,915 | 283,747 |

See notes to consolidated financial statements.

**Sotera Health Company**

### Consolidated Statements of Cash Flows

_(in thousands) · (Unaudited)_

| Line item | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- |
| Operating activities: |  |  |
| Net income (loss) | $80,232 | $(5,298) |
| Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |  |
| Depreciation | 53,046 | 45,223 |
| Amortization of intangible assets | 11,165 | 30,597 |
| Loss on refinancing of debt | 936 | 80 |
| Deferred income taxes | 13,796 | (25,099) |
| Share-based compensation expense | 21,611 | 15,361 |
| Accretion of asset retirement obligations | 1,306 | 1,136 |
| Unrealized foreign exchange (gain) loss | (4,334) | 18,886 |
| Unrealized loss (gain) on derivatives not designated as hedging instruments | 682 | (1,994) |
| Amortization of debt issuance costs | 3,094 | 2,645 |
| Other | (2,570) | (2,474) |
| Changes in operating assets and liabilities: |  |  |
| Accounts receivable | (13,256) | 9,084 |
| Inventories | (4,121) | (7,663) |
| Other current assets | (8,720) | (14,250) |
| Accounts payable | 13,411 | 5,573 |
| Accrued liabilities | (11,067) | (14,514) |
| Illinois EO litigation settlements | (34,000) | 64,943 |
| Income taxes payable / receivable, net | 497 | (8,212) |
| Other liabilities | (94) | (27) |
| Other long-term assets | (3,684) | (1,060) |
| Net cash provided by operating activities | 117,930 | 112,937 |
| Investing activities: |  |  |
| Purchases of property, plant and equipment | (92,615) | (51,147) |
| Other investing activities | 4,188 | 37 |
| Net cash used in investing activities | (88,427) | (51,110) |
| Financing activities: |  |  |
| Payment on long-term borrowings | (3,558) | (7,547) |
| Payments of debt issuance costs | (878) | (2,326) |
| Shares withheld for employee taxes on equity awards | (9,074) | (3,654) |
| Other financing activities | (1,674) | (1,493) |
| Net cash used in financing activities | (15,184) | (15,020) |
| Effect of exchange rate changes on cash and cash equivalents | (4,048) | 8,600 |
| Net increase in cash and cash equivalents, including restricted cash | 10,271 | 55,407 |
| Cash and cash equivalents, including restricted cash, at beginning of period | 346,456 | 278,865 |
| Cash and cash equivalents, including restricted cash, at end of period | $356,727 | $334,272 |
| Supplemental disclosures of cash flow information: |  |  |
| Cash paid during the period for interest | $85,088 | $102,716 |
| Cash paid during the period for income taxes, net of tax refunds received | 24,158 | 32,207 |
| Purchases of property, plant and equipment included in accounts payable | 35,397 | 10,307 |

See notes to consolidated financial statements.

### Sotera Health Company

### Consolidated Statements of Equity

(in thousands)

(Unaudited)

_Three Months Ended June 30, 2026_

| Line item | Common Stock / Shares | Common Stock / Amount | Treasury Stock | Additional Paid-In Capital | Retained Deficit | Accumulated Other Comprehensive(Loss) Income | Total Equity |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Balance at March 31, 2026 | 285,156 | $2,860 | $(12,100) | $1,263,189 | $(505,504) | $(125,940) | $622,505 |
| Share-based compensation plans | 206 | — | 2,812 | 4,203 | — | — | 7,015 |
| Comprehensive income: |  |  |  |  |  |  | — |
| Pension and post-retirement plan adjustments, net of tax | — | — | — | — | — | (98) | (98) |
| Foreign currency translation | — | — | — | — | — | (18,591) | (18,591) |
| Interest rate derivatives, net of tax | — | — | — | — | — | 1,174 | 1,174 |
| Net income | — | — | — | — | 53,643 | — | 53,643 |
| Balance at June 30, 2026 | 285,362 | $2,860 | $(9,288) | $1,267,392 | $(451,861) | $(143,455) | $665,648 |

_Six Months Ended June 30, 2026_

| Line item | Common Stock / Shares | Common Stock / Amount | Treasury Stock | Additional Paid-In Capital | Retained Deficit | Accumulated Other Comprehensive(Loss) Income | Total Equity |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Balance at December 31, 2025 | 284,371 | $2,860 | $(17,013) | $1,262,119 | $(532,093) | $(109,838) | $606,035 |
| Share-based compensation plans | 991 | — | 7,725 | 5,273 | — | — | 12,998 |
| Comprehensive income: |  |  |  |  |  |  |  |
| Pension and post-retirement plan adjustments, net of tax | — | — | — | — | — | (202) | (202) |
| Foreign currency translation | — | — | — | — | — | (36,222) | (36,222) |
| Interest rate derivatives, net of tax | — | — | — | — | — | 2,807 | 2,807 |
| Net income | — | — | — | — | 80,232 | — | 80,232 |
| Balance at June 30, 2026 | 285,362 | $2,860 | $(9,288) | $1,267,392 | $(451,861) | $(143,455) | $665,648 |

See notes to consolidated financial statements.

### Sotera Health Company

### Consolidated Statements of Equity (continued)

(in thousands)

(Unaudited)

_Three Months Ended June 30, 2025_

| Line item | Common Stock / Shares | Common Stock / Amount | Treasury Stock | Additional Paid-In Capital | Retained Deficit | Accumulated Other Comprehensive(Loss) Income | Total Equity |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Balance at March 31, 2025 | 283,855 | $2,860 | $(20,855) | $1,244,841 | $(623,302) | $(189,453) | $414,091 |
| Share-based compensation plans | 192 | — | 1,817 | 6,248 | — | — | 8,065 |
| Comprehensive income: |  |  |  |  |  |  |  |
| Pension and post-retirement plan adjustments, net of tax | — | — | — | — | — | 71 | 71 |
| Foreign currency translation | — | — | — | — | — | 82,217 | 82,217 |
| Interest rate derivatives, net of tax | — | — | — | — | — | (1,123) | (1,123) |
| Net income | — | — | — | — | 7,962 | — | 7,962 |
| Balance at June 30, 2025 | 284,047 | $2,860 | $(19,038) | $1,251,089 | $(615,340) | $(108,288) | $511,283 |

_Six Months Ended June 30, 2025_

| Line item | Common Stock / Shares | Common Stock / Amount | Treasury Stock | Additional Paid-In Capital | Retained Deficit | Accumulated Other Comprehensive(Loss) Income | Total Equity |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Balance at December 31, 2024 | 283,466 | $2,860 | $(23,434) | $1,243,778 | $(610,042) | $(208,251) | $404,911 |
| Share-based compensation plans | 581 | — | 4,396 | 7,311 | — | — | 11,707 |
| Comprehensive income: |  |  |  |  |  |  |  |
| Pension and post-retirement plan adjustments, net of tax | — | — | — | — | — | 81 | 81 |
| Foreign currency translation | — | — | — | — | — | 101,777 | 101,777 |
| Interest rate derivatives, net of tax | — | — | — | — | — | (1,895) | (1,895) |
| Net loss | — | — | — | — | (5,298) | — | (5,298) |
| Balance at June 30, 2025 | 284,047 | $2,860 | $(19,038) | $1,251,089 | $(615,340) | $(108,288) | $511,283 |

See notes to consolidated financial statements.

Sotera Health Company

### Notes to Consolidated Financial Statements

1.Basis of Presentation

Principles of Consolidation – Sotera Health Company (also referred to herein as the “Company,” “we,” “our,” “us” or “its”) is a leading global provider of mission-critical end-to-end sterilization solutions, lab testing and advisory services for the healthcare industry with operations primarily in the Americas, Europe and Asia.

We operate and report in three segments: Sterigenics, Nordion and Nelson Labs. We describe our reportable segments in Note 15, “Segment Information”. All intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates – In preparing our consolidated financial statements in conformity with U.S. Generally Accepted Accounting Principles (“GAAP”), we make estimates and assumptions that affect the amounts reported and the accompanying notes. We regularly evaluate the estimates and assumptions used and revise them as new information becomes available. Actual results may vary from those estimates.

Interim Financial Statements – The accompanying consolidated financial statements include the assets, liabilities, operating results, and cash flows of the Company and its wholly owned subsidiaries. These financial statements are prepared in accordance with GAAP for interim financial information and the instructions to the Quarterly Report on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. These unaudited interim financial statements should be read in conjunction with the Company's annual consolidated financial statements and accompanying notes in our 2025 10-K.

#### 2.Recent Accounting Standards

#### Accounting Standard Updates Issued But Not Yet Adopted

In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03,-Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. The amendments in this ASU require entities to disaggregate certain expense captions into specified categories in disclosures within the footnotes to the financial statements. In January 2025, the FASB issued ASU 2025-01, which revises the effective date of ASU 2024-03 and clarifies that entities are required to adopt the guidance in annual reporting periods beginning after December 15, 2026, and interim periods within annual reporting periods beginning after December 15, 2027. The Company expects that this ASU will increase disclosures in the annual and interim periods when adopted.

#### 3.Revenue Recognition

The following table shows disaggregated net revenues from contracts with external customers by timing of revenue and by segment for the three and six months ended June 30, 2026 and 2025:

| (thousands of U.S. dollars) | Three Months Ended June 30, 2026 / Sterigenics | Three Months Ended June 30, 2026 / Nordion | Three Months Ended June 30, 2026 / Nelson Labs | Three Months Ended June 30, 2026 / Consolidated |
| --- | --- | --- | --- | --- |
| Point in time | $211,571 | $47,232 | — | $258,803 |
| Over time | — | 1,917 | 60,655 | 62,572 |
| Total | $211,571 | $49,149 | $60,655 | $321,375 |

| (thousands of U.S. dollars) | Three Months Ended June 30, 2025 / Sterigenics | Three Months Ended June 30, 2025 / Nordion | Three Months Ended June 30, 2025 / Nelson Labs | Three Months Ended June 30, 2025 / Consolidated |
| --- | --- | --- | --- | --- |
| Point in time | $194,839 | $41,371 | — | $236,210 |
| Over time | — | 1,060 | 57,071 | 58,131 |
| Total | $194,839 | $42,431 | $57,071 | $294,341 |

Sotera Health Company

Notes to Consolidated Financial Statements

| (thousands of U.S. dollars) | Six Months Ended June 30, 2026 / Sterigenics | Six Months Ended June 30, 2026 / Nordion | Six Months Ended June 30, 2026 / Nelson Labs | Six Months Ended June 30, 2026 / Consolidated |
| --- | --- | --- | --- | --- |
| Point in time | $397,706 | $88,246 | — | $485,952 |
| Over time | — | 2,912 | 112,556 | 115,468 |
| Total | $397,706 | $91,158 | $112,556 | $601,420 |

| (thousands of U.S. dollars) | Six Months Ended June 30, 2025 / Sterigenics | Six Months Ended June 30, 2025 / Nordion | Six Months Ended June 30, 2025 / Nelson Labs | Six Months Ended June 30, 2025 / Consolidated |
| --- | --- | --- | --- | --- |
| Point in time | $364,523 | $73,671 | — | $438,194 |
| Over time | — | 1,317 | 109,353 | 110,670 |
| Total | $364,523 | $74,988 | $109,353 | $548,864 |

When we receive consideration from a customer prior to transferring goods or services under the terms of a sales contract, we record deferred revenue, which represents a contract liability. Deferred revenue totaled $14.2 million and $18.0 million at June 30, 2026 and December 31, 2025, respectively. We recognize deferred revenue after we have transferred control of the goods or services to the customer and all revenue recognition criteria are met.

#### 4.Inventories

Inventories consisted of the following:

| (thousands of U.S. dollars) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Raw materials and supplies | $46,905 | $45,569 |
| Work-in-process | 1,916 | 2,436 |
| Finished goods | 7,794 | 6,622 |
|  | 56,615 | 54,627 |
| Reserve for excess and obsolete inventory | (243) | (252) |
| Inventories, net | $56,372 | $54,375 |

#### 5.Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following:

| (thousands of U.S. dollars) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Prepaid taxes | $5,354 | $5,212 |
| Prepaid business insurance | 3,184 | 3,974 |
| Prepaid rent | 4,464 | 4,466 |
| Customer contract assets | 36,193 | 24,410 |
| Current deposits | 234 | 283 |
| Prepaid maintenance contracts | 910 | 490 |
| Value added tax receivable | 2,896 | 4,527 |
| Prepaid software licensing | 3,673 | 2,661 |
| Stock supplies | 5,594 | 5,012 |
| Embedded derivatives | 2,561 | 1,162 |
| Other | 9,676 | 13,053 |
| Prepaid expenses and other current assets | $74,739 | $65,250 |

Sotera Health Company

Notes to Consolidated Financial Statements

#### 6.Goodwill and Other Intangible Assets

Changes to goodwill during the six months ended June 30, 2026 were as follows:

| (thousands of U.S. dollars) | Sterigenics | Nordion | Nelson Labs | Total |
| --- | --- | --- | --- | --- |
| Goodwill at December 31, 2025 | $658,919 | $267,771 | $176,542 | $1,103,232 |
| Changes due to foreign currency exchange rates | (1,422) | (9,529) | (1,026) | (11,977) |
| Goodwill at June 30, 2026 | $657,497 | $258,242 | $175,516 | $1,091,255 |

Other intangible assets consisted of the following:

| (thousands of U.S. dollars) / As of June 30, 2026 | Gross Carrying Amount | Accumulated Amortization |
| --- | --- | --- |
| Finite-lived intangible assets |  |  |
| Customer relationships | $165,657 | $88,975 |
| Proprietary technology | 36,488 | 19,516 |
| Trade names | 2,400 | 2,240 |
| Land-use rights | 9,126 | 2,494 |
| Sealed source and supply agreements | 162,691 | 92,272 |
| Other | 600 | 560 |
| Total finite-lived intangible assets | 376,962 | 206,057 |
| Indefinite-lived intangible assets |  |  |
| Regulatory licenses and other(a) | 73,338 | — |
| Trade names / trademarks | 25,928 | — |
| Total indefinite-lived intangible assets | 99,266 | — |
| Total | $476,228 | $206,057 |

| As of December 31, 2025 | Gross Carrying Amount | Accumulated Amortization |
| --- | --- | --- |
| Finite-lived intangible assets |  |  |
| Customer relationships | $167,313 | $84,083 |
| Proprietary technology | 37,775 | 19,253 |
| Trade names | 2,400 | 2,000 |
| Land-use rights | 8,861 | 2,313 |
| Sealed source and supply agreements | 168,740 | 91,405 |
| Other | 900 | 790 |
| Total finite-lived intangible assets | 385,989 | 199,844 |
| Indefinite-lived intangible assets |  |  |
| Regulatory licenses and other(a) | 76,064 | — |
| Trade names / trademarks | 26,018 | — |
| Total indefinite-lived intangible assets | 102,082 | — |
| Total | $488,071 | $199,844 |

Sotera Health Company

Notes to Consolidated Financial Statements

(a)Includes certain transportation certifications, a class 1B nuclear license and other intangible assets related to obtaining such licensure. These assets are considered indefinite-lived as the decision for renewal by the Canadian Nuclear Safety Commission (“CNSC”) is highly based on a licensee’s previous assessments, reported incidents, and annual compliance and inspection results. New applications for a license can take a significant amount of time and cost; whereas an existing licensee with a historical record of compliance and current operating conditions is generally expected to obtain renewal, as Nordion has demonstrated over its 75-year history. In September 2025, the CNSC renewed Nordion’s Class 1B nuclear license for a 25-year term.

Amounts include the impact of foreign currency translation. Fully amortized amounts are written off.

Amortization expense for finite-lived intangible assets was $5.6 million and $11.9 million for the three months ended June 30, 2026 and 2025, respectively. $3.0 million and $9.3 million were included in “Amortization of intangible assets” in the Consolidated Statements of Operations and Comprehensive Income for the three months ended June 30, 2026 and 2025, respectively, whereas the remainder was included in “Cost of revenues.”

Amortization expense for finite-lived intangible assets was $11.2 million and $30.6 million for the six months ended June 30, 2026 and 2025, respectively. $6.0 million and $24.6 million were included in “Amortization of intangible assets” in the Consolidated Statements of Operations and Comprehensive Income for the six months ended June 30, 2026 and 2025, respectively, whereas the remainder was included in “Cost of revenues.”

The estimated aggregate amortization expense for finite-lived intangible assets for each of the next five years and thereafter is as follows:

| (thousands of U.S. dollars) |  |  |
| --- | --- | --- |
| For the remainder of 2026 | $ | $10,841 |
| 2027 | 20,616 |  |
| 2028 | 20,068 |  |
| 2029 | 19,959 |  |
| 2030 | 19,959 |  |
| Thereafter | 79,462 |  |
| Total | $ | $170,905 |

#### 7.Accrued Liabilities

Accrued liabilities consisted of the following:

| (thousands of U.S. dollars) | June 30, 2026 | December 31, 2025 |
| --- | --- | --- |
| Accrued employee compensation | $35,587 | $43,543 |
| Reserve for Illinois EO litigation settlements | — | 34,000 |
| Accrued interest expense | 5,270 | 20,543 |
| Embedded derivatives | 3,891 | 1,872 |
| Professional fees | 25,326 | 10,483 |
| Accrued utilities | 1,819 | 1,786 |
| Insurance accrual | 2,528 | 2,131 |
| Accrued taxes | 3,652 | 3,287 |
| Other | 5,500 | 7,091 |
| Accrued liabilities | $83,573 | $124,736 |

Sotera Health Company

Notes to Consolidated Financial Statements

#### 8.Long-Term Debt

Long-term debt consisted of the following:

| (thousands of U.S. dollars) / As of June 30, 2026 | Gross Amount | Unamortized Debt Issuance Costs | Unamortized Debt Discount | Net Amount |
| --- | --- | --- | --- | --- |
| Secured Notes due 2031 | $750,000 | $(2,840) | — | 747,160 |
| Term Loan due 2031 | 1,415,915 | (6,512) | (17,106) | 1,392,297 |
|  | 2,165,915 | (9,352) | (17,106) | 2,139,457 |
| Less current portion | 14,159 | (65) | (171) | 13,923 |
| Long-Term debt | $2,151,756 | $(9,287) | $(16,935) | $2,125,534 |

| (thousands of U.S. dollars) / As of December 31, 2025 | Gross Amount | Unamortized Debt Issuance Costs | Unamortized Debt Discount | Net Amount |
| --- | --- | --- | --- | --- |
| Secured Notes due 2031 | $750,000 | $(3,129) | — | 746,871 |
| Term Loan due 2031 | 1,419,472 | (6,618) | (19,028) | 1,393,826 |
|  | 2,169,472 | (9,747) | (19,028) | 2,140,697 |
| Less current portion | 14,230 | (66) | (191) | 13,973 |
| Long-Term Debt | $2,155,242 | $(9,681) | $(18,837) | $2,126,724 |

#### Debt Facilities

Under the debt agreements summarized below, at June 30, 2026, we and Sotera Health Holdings, LLC (“SHH”), our wholly owned subsidiary, had debt payment obligations under (a) a term loan in the amount of $1,415.9 million, (b) a revolving credit facility, which supported operationally-related letters of credit but was otherwise undrawn, and which provides us with capacity of up to $600.0 million for future potential borrowings, and (c) $750.0 million of senior secured notes. Our debt agreements also include additional covenants, conditions and rights to request additional debt, as summarized below.

#### Senior Secured Credit Facilities and Indenture

On December 13, 2019, SHH entered into senior secured first lien credit facilities (the “Senior Secured Credit Facilities”), consisting of both a prepayable senior secured first lien term loan (the “Term Loans”) and a senior secured first lien revolving credit facility (the “Revolving Credit Facility”) pursuant to a first lien credit agreement (as amended through Amendment No. 7, the “Credit Agreement”). The Senior Secured Credit Facilities also provide SHH the right at any time and under certain conditions to request incremental term loans or incremental revolving credit commitments based on a formula defined in the Senior Secured Credit Facilities.

On May 20, 2026, SHH, the Company, certain subsidiaries of the Company, each 2026 Refinancing Term Lender (as defined in the Credit Agreement) and JPMorgan Chase Bank, N.A., as first lien Administrative Agent entered into Amendment No. 7 (“Amendment No. 7”) to the Credit Agreement. Among other changes, Amendment No. 7 provides for refinancing lenders to provide repriced Term Loans to SHH in an aggregate principal amount of $1,415.9 million. Amendment No. 7 reduced the interest rate spread by 0.25% across Term Loans under the facility. The Term Loans under the credit facility shall have an applicable interest rate margin equal to Adjusted Term SOFR (as defined in the Credit Agreement) plus 2.25%, with a 0.00% floor (with optionality for the Company to elect Alternate Base Rate plus 1.25% or Adjusted Daily Simple SOFR plus 2.25% (each as defined in the Credit Agreement)). The Term Loans are also subject to a “soft call” premium of 1.00% for certain repricing transactions with respect to the Term Loans that occur within the six-month period after the effective date of the Amendment. The Term Loans amortize at a rate of 1.00% per annum and mature on May 30, 2031.

The weighted average interest rates on borrowings under the Term Loans for the three months ended June 30, 2026 and June 30, 2025 were 6.03% and 7.55%, respectively, and 6.13% and 7.60% for the six months ended June 30, 2026 and 2025, respectively.

Sotera Health Company

Notes to Consolidated Financial Statements

On May 30, 2024, SHH, the Company, certain subsidiaries of the Company, and Wilmington Trust, National Association, as trustee, paying agent, registrar, transfer agent and notes collateral agent, entered into an Indenture (the “Indenture”) governing SHH’s $750.0 million aggregate principal amount of 7.375% senior secured notes due 2031 (the “Secured Notes”) issued in May 2024. The Secured Notes pay interest semiannually in arrears on June 1 and December 1 of each year, which began on December 1, 2024, at a rate of 7.375% per year, and will mature on June 1, 2031.

Outstanding letters of credit are collateralized by encumbrances against the Revolving Credit Facility and the collateral pledged thereunder, or by cash placed on deposit with the issuing bank. As of June 30, 2026, the Company had $8.3 million of letters of credit issued against the Revolving Credit Facility, resulting in total availability under the Revolving Credit Facility of $591.7 million.

#### 9.Income Taxes

Income tax expense is provided on an interim basis based upon our estimate of the annual effective income tax rate. In determining the estimated annual effective income tax rate, we analyze various factors, including projections of our annual earnings and the taxing jurisdictions where the earnings will occur, the impact of state and local taxes, our ability to utilize tax credits and net operating loss carryforwards and available tax planning alternatives. Our effective tax rates were 31.3% and 33.5% for the three and six months ended June 30, 2026, respectively. For the three and six months ended June 30, 2025, our effective tax rates were 57.9% and 230.0%, respectively.

Income tax expense for the three and six months ended June 30, 2026 differed from the statutory rate primarily due to the foreign rate differential, current year permanent differences, including foreign withholding taxes and other non-deductible items, and U.S. state income taxes (net of federal tax benefit). Income tax expense for the three and six months ended June 30, 2025 differed from the statutory rate primarily due to the valuation allowance attributable to the limitation on the deductibility of interest expense, the impact of the foreign rate differential and current year permanent tax differences, partially offset by a benefit for state income taxes.

#### 10.Employee Benefits

The Company sponsors various post-employment benefit plans including, in certain countries outside the United States, defined benefit and defined contribution pension plans, retirement compensation arrangements, and plans that provide extended health care coverage to retired employees, the majority of which relate to Nordion. The interest cost, expected return on plan assets and amortization of net actuarial gain are recorded in “Other income, net” and the service cost component is included in the same financial statement line item as the applicable employee’s wages in the Consolidated Statements of Operations and Comprehensive Income.

#### Defined benefit pension plan

The following defined benefit pension plan disclosure relates to Nordion. Certain immaterial foreign defined benefit pension plans have been excluded from the table below. The components of net periodic pension benefit for the defined benefit plans for the three and six months ended June 30, 2026 and 2025 were as follows:

| (thousands of U.S. dollars) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Service cost | $116 | $125 | $234 | $245 |
| Interest cost | 2,306 | 2,393 | 4,633 | 4,701 |
| Expected return on plan assets | (4,189) | (3,996) | (8,418) | (7,848) |
| Net periodic benefit | $(1,767) | $(1,478) | $(3,551) | $(2,902) |

#### Other benefit plans

Other benefit plans disclosed below relate to Nordion and include a supplemental retirement arrangement, a retirement and termination allowance, and post-retirement benefit plans, which include contributory health and dental care benefits and contributory life insurance coverage. Certain immaterial other foreign benefit plans have been excluded from the table below.

Sotera Health Company

Notes to Consolidated Financial Statements

All non-pension post-employment benefit plans are unfunded. The components of net periodic pension cost for the other benefit plans for the three and six months ended June 30, 2026 and 2025 were as follows:

| (thousands of U.S. dollars) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Service cost | $1 | $1 | $2 | $2 |
| Interest cost | 75 | 79 | 152 | 155 |
| Amortization of net actuarial gain | (33) | (18) | (67) | (36) |
| Net periodic benefit cost | $43 | $62 | $87 | $121 |

#### 11.Other Comprehensive Income (Loss)

Amounts in accumulated other comprehensive income (loss) are presented net of the related tax. Foreign currency translation is not adjusted for income taxes.

Changes in our accumulated other comprehensive income (loss) balances, net of applicable tax, were as follows:

| (thousands of U.S. dollars) | Defined Benefit Plans | Foreign Currency Translation | Interest Rate Derivatives | Total |
| --- | --- | --- | --- | --- |
| Beginning balance – April 1, 2026 | $3,447 | $(129,182) | $(205) | $(125,940) |
| Other comprehensive income (loss) beforereclassifications | (65) | (18,591) | 1,175 | (17,481) |
| Amounts reclassified from accumulated othercomprehensive income (loss) | (33) | — | (1) | (34) |
| Net current-period other comprehensive income (loss) | (98) | (18,591) | 1,174 | (17,515) |
| Ending balance – June 30, 2026 | $3,349 | $(147,773) | $969 | $(143,455) |
| Beginning balance – January 1, 2026 | $3,551 | $(111,551) | $(1,838) | (109,838) |
| Other comprehensive income (loss) beforereclassifications | (135) | (36,222) | 2,840 | (33,517) |
| Amounts reclassified from accumulated othercomprehensive income (loss) | (67) | — | (33) | (100) |
| Net current-period other comprehensive income (loss) | (202) | (36,222) | 2,807 | (33,617) |
| Ending balance – June 30, 2026 | $3,349 | $(147,773) | $969 | $(143,455) |

Sotera Health Company

Notes to Consolidated Financial Statements

| (thousands of U.S. dollars) | Defined Benefit Plans | Foreign Currency Translation | Interest Rate Derivatives | Total |
| --- | --- | --- | --- | --- |
| Beginning balance – April 1, 2025 | $1,175 | $(190,106) | $(522) | $(189,453) |
| Other comprehensive income (loss) beforereclassifications | 89 | 82,217 | (874) | 81,432 |
| Amounts reclassified from accumulated othercomprehensive income (loss) | (18) | — | (249) | (267) |
| Net current-period other comprehensive income (loss) | 71 | 82,217 | (1,123) | 81,165 |
| Ending balance – June 30, 2025 | $1,246 | $(107,889) | $(1,645) | $(108,288) |
| Beginning balance – January 1, 2025 | $1,165 | $(209,666) | $250 | $(208,251) |
| Other comprehensive income (loss) beforereclassifications | 117 | 101,777 | (1,394) | 100,500 |
| Amounts reclassified from accumulated othercomprehensive income (loss) | (36) | — | (501) | (537) |
| Net current-period other comprehensive income (loss) | 81 | 101,777 | (1,895) | 99,963 |
| Ending balance – June 30, 2025 | $1,246 | $(107,889) | $(1,645) | $(108,288) |

(a)For defined benefit pension plans, amounts reclassified from accumulated other comprehensive income (loss) are recorded to “Other income, net” within the Consolidated Statements of Operations and Comprehensive Income.

(b)For interest rate derivatives, amounts reclassified from accumulated other comprehensive income (loss) are recorded to “Interest expense, net” within the Consolidated Statements of Operations and Comprehensive Income.

#### 12.Earnings (Loss) Per Share

Basic earnings per share represents the amount of income attributable to each common share outstanding. Diluted earnings per share represents the amount of income attributable to each common share outstanding adjusted for the effects of potentially dilutive common shares. Potentially dilutive common shares include stock options and other stock-based awards. In the periods where the effect would be antidilutive, potentially dilutive common shares are excluded from the calculation of diluted earnings per share.

For 2025 and prior years, in periods in which the Company had net income, earnings per share was calculated using the two-class method. This method was required as unvested pre-IPO restricted stock awards had the right to receive non-forfeitable dividends or dividend equivalents if the Company were to declare dividends on its common stock. Pursuant to the two-class method, earnings for each period were allocated on a pro-rata basis to common stockholders and unvested pre-IPO restricted stock awards. Diluted earnings per share was computed using the more dilutive of the (a) two-class method and (b) treasury stock method, as applicable, to the potentially dilutive instruments.

In periods in which the Company had a net loss, the two-class method was not applicable because the unvested pre-IPO restricted stock awards did not participate in losses.

Beginning in 2026, earnings per share is calculated using the treasury stock method. As all pre-IPO restricted stock awards were fully vested in the third quarter of 2025, the use of the two-class method is no longer required. Diluted earnings per share represents the weighted average number of common shares outstanding plus the dilutive effect of potential common shares calculated using the treasury stock method.

Sotera Health Company

Notes to Consolidated Financial Statements

Our basic and diluted earnings (loss) per common share are calculated as follows:

| in thousands of U.S. dollars and share amounts (except per share amounts) | Three Months Ended / June 30,2026 | Three Months Ended / June 30,2025 | Six Months Ended / June 30,2026 | Six Months Ended / June 30,2025 |
| --- | --- | --- | --- | --- |
| Earnings (Loss): |  |  |  |  |
| Net income (loss) | $53,643 | $7,962 | $80,232 | $(5,298) |
| Less: Allocation to participating securities | — | 1 | — | — |
| Net income (loss) attributable to Sotera Health Company common shareholders | $53,643 | $7,961 | $80,232 | $(5,298) |
| Weighted Average Common Shares: |  |  |  |  |
| Weighted-average common shares outstanding - basic | 285,773 | 283,933 | 285,333 | 283,747 |
| Dilutive effect of potential common shares(a) | 2,375 | 1,823 | 2,582 | — |
| Weighted-average common shares outstanding - diluted | 288,148 | 285,756 | 287,915 | 283,747 |
| Earnings per Common Share: |  |  |  |  |
| Net income (loss) per common share attributable to Sotera Health Company common shareholders - basic | $0.19 | $0.03 | $0.28 | $(0.02) |
| Net income (loss) per common share attributable to Sotera Health Company common shareholders - diluted | 0.19 | 0.03 | 0.28 | (0.02) |

(a)As the Company reported a net loss for the six months ended June 30, 2025, the calculation of diluted weighted average common shares outstanding is not applicable because the effect of including the potential common shares would be anti-dilutive.

Diluted earnings per share does not consider the following potential common shares as the effect would be anti-dilutive:

| in thousands of share amounts | Three Months Ended / June 30,2026 | Three Months Ended / June 30,2025 | Six Months Ended / June 30,2026 | Six Months Ended / June 30,2025 |
| --- | --- | --- | --- | --- |
| Stock options | 4,676 | 5,566 | 4,672 | 8,299 |
| RSUs | 375 | 1,473 | 254 | 2,669 |
| PSUs | — | — | — | 475 |
| Total anti-dilutive securities | 5,051 | 7,039 | 4,926 | 11,443 |

#### 13.Commitments and Contingencies

From time to time, we may be or are subject to various lawsuits and other claims, as well as gain contingencies, in the ordinary course of our business. In addition, from time to time, we receive communications from government or regulatory agencies concerning investigations or allegations of noncompliance with laws or regulations in jurisdictions in which we operate. We assess these regulatory and legal actions to determine if a contingent liability should be recorded. In making these determinations, we may, depending on the nature of the matter, consult with internal and external legal counsel and technical experts.

We establish reserves for specific liabilities in connection with regulatory and legal actions that we determine to be both probable and reasonably estimable. The outcomes of regulatory and legal actions can be difficult to predict and are often resolved over long periods of time, making our probability and estimability determinations highly judgmental. Probability determinations require the analysis of various possible outcomes, assessments of potential damages and the impact of multiple factors beyond our control, including potential actions by others, interpretations of the law, and changes and developments in relevant facts, circumstances, regulations and other laws. If a potentially material loss contingency is not probable, but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability is disclosed, together with an estimate of the range of possible loss if the range is determinable and material. In certain of the matters described below, we are not able to estimate potential liability because of the uncertainties related to the outcome(s) and/or the amount(s) or range(s) of loss. The ultimate resolution of pending regulatory and legal matters in future periods, including the matters described below, may have a material adverse effect on our financial condition, results of operations and/or liquidity. The Company may also

Sotera Health Company

Notes to Consolidated Financial Statements

incur material defense and settlement costs, diversion of management resources and other adverse effects on our business, financial condition, and/or results of operations.

The information regarding those matters set forth below is as of June 30, 2026, except as otherwise indicated.

#### Ethylene Oxide Tort Litigation

Sterigenics U.S., LLC (“Sterigenics”) and other medical supply sterilization companies have been subjected to tort lawsuits alleging various injuries caused by low-level environmental exposure to EO used at or emitted or released from sterilization facilities. Those lawsuits, as detailed further below, are individual claims, as opposed to class actions.

#### California

As of July 31, 2026, subsidiaries of the Company and other parties are defendants in lawsuits pending in Los Angeles County Superior Court in which the plaintiffs assert approximately 150 claims for personal injury or wrongful death allegedly resulting from use, emissions and releases of EO from Sterigenics’ Vernon facilities (the “Vernon Cases”). The Vernon Cases have been assigned to one judge, with initial trials scheduled for January and April 2027. Eight individual claims have been selected as the “First Plaintiff Group” and are being prioritized for discovery.

#### Georgia

Subsidiaries of the Company and other parties are defendants in lawsuits in Georgia in which plaintiffs allege personal injuries, wrongful death and property devaluation resulting from use, emissions and releases of EO from or at Sterigenics’ Atlanta facility.

As of July 31, 2026, approximately 500 personal injury and wrongful death claims filed in the State Court of Cobb County (the “Georgia Trial Court”) are assigned to a single judge (the “Georgia Personal Injury Cases”). The Georgia Personal Injury Cases are governed in the Georgia Trial Court by case management orders pursuant to which general causation issues in a pool of eight cases were to be adjudicated in Phase 1 and specific causation issues in those pool cases were to be adjudicated in Phase 2; the remaining Georgia Personal Injury Cases, including 15 cases that include both personal injury and property claims and one personal injury lawsuit that is pending before a different judge, are stayed.

On November 22, 2024, the Georgia Trial Court issued a Phase 1 ruling on general causation issues granting in part and denying in part defendants’ motions to exclude certain Phase 1 expert testimony and defendants’ motions for summary judgment on Phase 1 issues (the “First General Causation Ruling”). Plaintiffs and defendants appealed the First General Causation Ruling to the Court of Appeals of Georgia (the “Phase 1 General Causation Appeals”). While the Phase 1 General Causation Appeals were pending, three of the pool cases, selected by plaintiffs’ counsel, proceeded to Phase 2 (the “Phase 2 Cases”). On October 17, 2025, the Georgia Trial Court issued its Phase 2 rulings on specific causation issues granting Sterigenics’ motions to exclude three of plaintiffs’ specific causation expert witnesses and granting Sterigenics’ motions for summary judgment in all three Phase 2 Cases (the “Specific Causation Ruling”). On October 28, 2025, the Georgia Trial Court entered an order also adopting its Specific Causation Ruling with respect to our subsidiary Sotera Health LLC. Plaintiffs in the Phase 2 Cases appealed the Specific Causation Ruling to the Court of Appeals of Georgia (the “Phase 2 Specific Causation Appeals”).

On October 31, 2025, the Court of Appeals of Georgia ruled on the Phase 1 General Causation Appeals, finding that as Sterigenics contended on appeal, the First General Causation Ruling failed to apply the proper standard for determining the admissibility of expert testimony on general causation, vacating the First General Causation Ruling and remanding the pool cases to the Georgia Trial Court with instructions to apply the proper standard in ruling on general causation issues. The Court of Appeals also instructed the Georgia Trial Court to consider whether plaintiffs can prove general causation through epidemiological evidence and background risks of the diseases at issue. On March 30, 2026, the Georgia Trial Court granted defendants’ motions to exclude plaintiffs’ general causation experts and entered summary judgment for defendants in the five remanded pool cases (the “Second General Causation Ruling and Judgment”). Plaintiffs in the five remanded pool cases appealed the Second General Causation Ruling and Judgment to the Court of Appeals of Georgia (the “Second Phase 1 General Causation Appeals”). Proceedings in the Georgia Trial Court are stayed pending resolution of the Second Phase 1 General Causation Appeals and the Phase 2 Specific Causation Appeals.

Sotera Health Company

Notes to Consolidated Financial Statements

Subsidiaries of the Company and other parties are also defendants in a lawsuit filed in May 2020 in which employees of a sterilization customer of Sterigenics allege they were injured while working at the customer’s distribution facility by exposure to residual EO allegedly emanating from products of the customer that had been sterilized by Sterigenics. The case is proceeding in the Superior Court of Cobb County on plaintiffs’ Fifth Amended Complaint. Pursuant to the customer’s contract with Sterigenics, the customer is indemnifying Sterigenics against this lawsuit.

As of July 31, 2026, approximately 305 lawsuits have been filed in the Georgia Trial Court against subsidiaries of the Company and other parties in which plaintiffs allege property devaluation resulting from use, emissions and releases of EO from or at Sterigenics’ Atlanta facility. These cases have been consolidated for pretrial purposes (the “Consolidated Property Cases”). Proceedings in a pool of nine of the Consolidated Property Cases are governed by case management orders pursuant to which the parties completed discovery and defendants filed motions to exclude certain plaintiffs’ expert testimony and motions for summary judgment, which remain pending. The remaining cases are stayed.

#### Illinois

Lawsuits against subsidiaries of the Company and other parties have been filed in the Circuit Court of Cook County, Illinois, by plaintiffs alleging personal injury or wrongful death resulting from use, emissions and releases of EO from Sterigenics’ former Willowbrook facility (the “Illinois Cases”). As of July 31, 2026, subsidiaries of the Company and other parties are defendants in approximately 15 Illinois Cases that are in various stages of pleadings, motions practice and fact discovery.

#### New Mexico

On June 24, 2026, the Company and certain subsidiaries agreed with the State of New Mexico to settle the lawsuit filed by the New Mexico Attorney General in the Third Judicial District Court, Doña Ana County, New Mexico (the “Trial Court”) in December 2020. The settlement, which was entered into without any admission of liability or wrongdoing by any defendant, fully and finally resolved all claims asserted, or that could have been asserted, in the litigation for an amount that was not material to the Company. On July 7, 2026, the Trial Court entered a Consent Order Dissolving Preliminary Injunction and an Order of Dismissal With Prejudice.

* * *

Additional EO lawsuits have been threatened relating to Sterigenics’ current and former EO sterilization facilities in the United States and may be filed in the future. These threats of additional EO lawsuits are comparable to threats that have similarly been made against other companies within our industry. Based on our view of the strength of the science and related evidence that emissions of EO from Sterigenics’ operations have not caused and could not have caused the harms alleged in such lawsuits, we believe that losses in the remaining or future EO cases through trials and any appeals that may prove necessary are not probable. Although the Company is vigorously defending against the EO tort claims, future settlements of EO tort claims are reasonably possible. The previously disclosed settlements of certain cases related to our facilities in Willowbrook and Atlanta were driven by dynamics unique to the claims that were settled and thus should not give rise to presumptions that the Company will settle additional EO tort claims and/or that any such settlements will be for comparable amounts.

Potential trial and settlement outcomes can vary widely based on a host of factors. EO tort lawsuits will be presided over by different judges, tried by different counsel presenting different evidence and decided by different juries. The substantive and procedural laws of jurisdictions vary and can meaningfully impact the litigation process and outcome of a case. Each plaintiff’s claim involves unique facts and evidence, including the circumstances of the plaintiff’s alleged exposure, the type and severity of the plaintiff’s disease, the plaintiff’s medical history and course of treatment, the location of and other factors related to the plaintiff’s real property, and other circumstances. The outcomes of trials before juries are rarely certain and a judgment rendered or settlement reached in one case is not necessarily representative of potential outcomes of other seemingly comparable cases. As a result, it is not possible to estimate a reasonably possible loss or range of loss with respect to any future EO tort lawsuit, trial or settlement. We are vigorously defending the EO tort lawsuits.

#### 14.Financial Instruments and Financial Risk

#### Derivative Instruments

We do not use derivatives for trading or speculative purposes and are not a party to leveraged derivatives.

Sotera Health Company

Notes to Consolidated Financial Statements

#### Derivatives Designated in Hedge Relationships

From time to time, the Company utilizes interest rate derivatives designated in hedge relationships to manage interest rate risk associated with our variable rate borrowings. These instruments are measured at fair value with changes in fair value recorded as a component of “Accumulated other comprehensive loss” on our Consolidated Balance Sheets.

In March 2025, we entered into an interest rate swap agreement with a notional amount of $400.0 million. The interest rate swap was effective on August 31, 2025 and expires on August 31, 2027. We receive interest at the one-month Term SOFR rate and pay a fixed interest rate under the terms of the swap agreement. In March 2023, we entered into an interest rate swap agreement with a notional amount of $400.0 million. The interest rate swap was effective on August 23, 2023 and expired on August 23, 2025. We received interest at the one-month Term SOFR rate and paid a fixed interest rate under the terms of the swap agreement.

We designated both interest rate swaps as cash flow hedges designed to hedge the variability of cash flows attributable to changes in the SOFR benchmark interest rate of our Term Loan (or any successor thereto).

#### Derivatives Not Designated in Hedge Relationships

The Company also enters into foreign currency forward contracts to manage foreign currency exchange rate risk of our intercompany loans in certain of our international subsidiaries and non-functional currency assets and liabilities. The foreign currency forward contracts expire on a monthly basis. These foreign currency derivatives are not designated in hedge relationships.

#### Embedded Derivatives

We have embedded derivatives in certain of our customer and supply contracts as a result of the currency of the contract being different from the functional currency of the parties involved. Changes in the fair value of the embedded derivatives are recognized in “Other income, net” in the Consolidated Statements of Operations and Comprehensive Income.

The following table provides a summary of the notional and fair values of our derivative instruments:

| (in U.S. Dollars; notional in millions, fair value in thousands) | June 30, 2026 / Notional Amount | June 30, 2026 / Fair Value / Derivative Assets | June 30, 2026 / Fair Value / Derivative Liabilities | December 31, 2025 / Notional Amount | December 31, 2025 / Fair Value / Derivative Assets | December 31, 2025 / Fair Value / Derivative Liabilities |
| --- | --- | --- | --- | --- | --- | --- |
| Derivatives designated as hedging instruments |  |  |  |  |  |  |
| Interest rate swaps | $400.0 | $1,424 | — | $400.0 | — | $2,346 |
| Derivatives not designated as hedging instruments |  |  |  |  |  |  |
| Foreign currency forward contracts | 19.0 | — | $38 | — | — | — |
| Embedded derivatives | 243.0 | 2,561 | 3,891 | 264.4 | $1,162 | 1,872 |
| Total | $662.0 | $3,985 | $3,929 | $664.4 | $1,162 | $4,218 |

(a)Represents the total notional amounts for certain of the Company’s supply and sales contracts accounted for as embedded derivatives.

Embedded derivatives assets/liabilities and foreign currency forward contracts are included in “Prepaid expenses and other current assets” and “Accrued liabilities” on our Consolidated Balance Sheets depending upon their position at period end. Interest rate swaps are included in “Other assets” and “Noncurrent liabilities” on the Consolidated Balance Sheets depending upon their position at period end.

Sotera Health Company

Notes to Consolidated Financial Statements

The following table summarizes the activities of our derivative instruments for the periods presented, and the line item they are recorded in the Consolidated Statements of Operations and Comprehensive Income:

| (thousands of U.S. dollars) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Realized gain on interest rate derivatives recorded in interest expense, net(a) | $(2) | $(334) | $(45) | $(673) |
| Unrealized (gain) loss on embedded derivatives recorded in other income, net | (512) | (3,599) | 682 | (1,994) |
| Realized gain on foreign currency forward contracts recorded in foreign exchange (gain) loss | (1,830) | (7,606) | (614) | (8,170) |
| Unrealized loss (gain) on foreign currency forward contracts recorded in foreign exchange (gain) loss | 17 | (1,144) | 38 | (704) |

(a) For the three and six months ended June 30, 2026 and 2025, amounts represent settlement payments on interest rate swaps.

#### Credit Risk

Certain of our financial assets, including cash and cash equivalents, are exposed to credit risk.

We are also exposed, in our normal course of business, to credit risk from our customers. As of June 30, 2026 and December 31, 2025, accounts receivable was net of an allowance for uncollectible accounts of $2.8 million and $3.0 million, respectively.

Credit risk on financial instruments arises from the potential for counterparties to default on their contractual obligations to us. We are exposed to credit risk in the event of non-performance, but do not anticipate non-performance by any of the counterparties to our financial instruments. We limit our credit risk by dealing with counterparties that are considered to be of high credit quality. In the event of non-performance by counterparties, the carrying value of our financial instruments represents the maximum amount of loss that would be incurred.

Our credit team evaluates and regularly monitors changes in the credit risk of our customers. We routinely assess the collectability of accounts receivable and maintain an adequate allowance for uncollectible accounts to address potential credit losses. The process includes a review of customer financial information and credit ratings, current market conditions as well as the expected future economic conditions that may impact the collection of trade receivables. We regularly review our customers’ past due amounts through an analysis of aged accounts receivables, specific customer past due aging amounts, and the history of trade receivables written off. Upon concluding that a receivable balance is not collectible, the balance is written off against the allowance for uncollectible accounts.

#### Fair Value Hierarchy

The fair value of our financial instruments is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The valuation techniques we would use to determine such fair values are described as follows: Level 1—fair values determined by inputs utilizing quoted prices in active markets for identical assets or liabilities; Level 2—fair values based on observable inputs other than quoted prices included in Level 1, such as quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets and liabilities in markets that are not active, or other inputs that are observable; Level 3—fair values determined by unobservable inputs reflecting our own assumptions, consistent with reasonably available assumptions made by other market participants.

Sotera Health Company

Notes to Consolidated Financial Statements

The following table discloses the fair value of our financial assets and liabilities:

| As of June 30, 2026 / (thousands of U.S. dollars) | Carrying Amount | Fair Value / Level 1 | Fair Value / Level 2 | Fair Value / Level 3 |
| --- | --- | --- | --- | --- |
| Derivatives designated as hedging instruments(a) |  |  |  |  |
| Interest rate swap asset | $1,424 | — | $1,424 | — |
| Derivatives not designated as hedging instruments(b) |  |  |  |  |
| Foreign currency forward contract liabilities | 38 | — | 38 | — |
| Embedded derivative assets | 2,561 | — | 2,561 | — |
| Embedded derivative liabilities | 3,891 | — | 3,891 | — |
| Current portion of long-term debt(c) |  |  |  |  |
| Term Loan, due 2031 | 13,923 | — | 14,159 | — |
| Long-Term Debt(c) |  |  |  |  |
| Secured Notes, due 2031 | 747,160 | — | 774,375 | — |
| Term Loan, due 2031 | 1,378,374 | — | 1,401,756 | — |
| Finance Lease Obligations (with current portion)(d) | 95,307 | — | 95,307 | — |

| As of December 31, 2025 / (thousands of U.S. dollars) | Carrying Amount | Fair Value / Level 1 | Fair Value / Level 2 | Fair Value / Level 3 |
| --- | --- | --- | --- | --- |
| Derivatives designated as hedging instruments(a) |  |  |  |  |
| Interest rate swap liability | $2,346 | — | $2,346 | — |
| Derivatives not designated as hedging instruments(b) |  |  |  |  |
| Embedded derivative assets | 1,162 | — | 1,162 | — |
| Embedded derivative liabilities | 1,872 | — | 1,872 | — |
| Current portion of long-term debt(c) |  |  |  |  |
| Term Loan, due 2031 | 13,973 | — | 14,327 | — |
| Long-Term Debt(c) |  |  |  |  |
| Secured Notes, due 2031 | 746,871 | — | 789,375 | — |
| Term Loan, due 2031 | 1,379,853 | — | 1,410,539 | — |
| Finance Lease Obligations (with current portion)(d) | 97,300 | — | 97,300 | — |

(a)Derivatives designated as hedging instruments are measured at fair value with changes in fair value recorded as a component of accumulated other comprehensive income (loss). Interest rate swaps are valued using pricing models that incorporate observable market inputs including interest rate curves and yield curves.

(b)Derivatives that are not designated as hedging instruments are measured at fair value with gains or losses recognized immediately in the Consolidated Statements of Operations and Comprehensive Income. Embedded derivatives are valued using internally developed models that rely on observable market inputs, including foreign currency forward curves. Foreign currency forward contracts are valued by reference to changes in foreign currency exchange rates over the life of the contract.

(c)Carrying amounts of current portion of long-term debt and long-term debt instruments are reported net of discounts and debt issuance costs. The estimated fair value of these instruments are based upon quoted prices for the Term Loan and the Secured Notes in inactive markets as provided by an independent fixed income security pricing service.

(d)Fair value approximates carrying value.

Sotera Health Company

Notes to Consolidated Financial Statements

#### 15.Segment Information

We identify our operating segments based on the way we manage, evaluate and internally report our business activities for purposes of allocating resources and assessing performance. We have three reportable segments: Sterigenics, Nordion and Nelson Labs. We have determined our reportable segments based upon an assessment of organizational structure, service types, and internally prepared financial statements. Our chief operating decision-maker (“CODM”), the Chief Executive Officer of Sotera Health Company, evaluates performance and allocates resources based on net revenues and segment income after the elimination of intercompany activities. The CODM uses these performance measures to inform decisions about the operations of the business and dedication of resources to selling and general administrative matters pertinent to the Company. The accounting policies of our reportable segments are the same as those described in Note 1, “Significant Accounting Policies,” of the Company’s annual consolidated financial statements and accompanying notes in our 2025 10-K.

#### Sterigenics

Sterigenics provides outsourced terminal sterilization and irradiation services for the medical device, pharmaceutical, food safety and advanced applications markets using four major technologies: gamma irradiation, EO processing, E-beam and X-Ray irradiation.

#### Nordion

Nordion is a leading global provider of Co-60 used in the sterilization and irradiation processes for the medical device, pharmaceutical, food safety, and high-performance materials industries, as well as in the treatment of cancer. In addition, Nordion is a leading global provider of gamma irradiation systems.

#### Nelson Labs

Nelson Labs provides outsourced microbiological and analytical chemistry testing and advisory services for the medical device and pharmaceutical industries.

_Three Months Ended June 30, 2026_

| (thousands of U.S. dollars) | Sterigenics | Nordion | Nelson Labs | Total |
| --- | --- | --- | --- | --- |
| Net revenues(a) | $211,571 | $49,149 | $60,655 | $321,375 |
| Segment expenses(b) | 83,507 | 19,704 | 39,450 | 142,661 |
| Corporate expense allocation(c) | 9,939 | 1,465 | 1,571 | 12,975 |
| Segment income | $118,125 | $27,980 | $19,634 | $165,739 |

_Six Months Ended June 30, 2026_

| (thousands of U.S. dollars) | Sterigenics | Nordion | Nelson Labs | Total |
| --- | --- | --- | --- | --- |
| Net revenues(a) | $397,706 | $91,158 | $112,556 | $601,420 |
| Segment expenses(b) | 164,533 | 36,722 | 75,450 | 276,705 |
| Corporate expense allocation(c) | 18,634 | 2,745 | 2,944 | 24,323 |
| Segment income | $214,539 | $51,691 | $34,162 | $300,392 |

_Three Months Ended June 30, 2025_

| (thousands of U.S. dollars) | Sterigenics | Nordion | Nelson Labs | Total |
| --- | --- | --- | --- | --- |
| Net revenues(a) | $194,839 | $42,431 | $57,071 | $294,341 |
| Segment expenses(b) | 76,973 | 17,417 | 36,049 | 130,439 |
| Corporate expense allocation(c) | 10,121 | 1,537 | 1,509 | 13,167 |
| Segment income | $107,745 | $23,477 | $19,513 | $150,735 |

Sotera Health Company

Notes to Consolidated Financial Statements

_Six Months Ended June 30, 2025_

| (thousands of U.S. dollars) | Sterigenics | Nordion | Nelson Labs | Total |
| --- | --- | --- | --- | --- |
| Net revenues(a) | $364,523 | $74,988 | $109,353 | $548,864 |
| Segment expenses(b) | 149,827 | 31,212 | 70,601 | 251,640 |
| Corporate expense allocation(c) | 18,947 | 2,877 | 2,826 | 24,650 |
| Segment income | $195,749 | $40,899 | $35,926 | $272,574 |

(a)Revenues are reported net of intersegment sales. Our Nordion segment recognized $10.3 million and $10.5 million in revenues from sales to our Sterigenics segment for the three months ended June 30, 2026 and 2025, respectively, and $29.5 million and $20.3 million in revenues from sales to our Sterigenics segment for the six months ended June 30, 2026 and 2025, respectively, that is not reflected in net revenues in the table above. Intersegment sales for Sterigenics and Nelson Labs are immaterial for all periods presented.

(b)Segment expenses are comprised of direct materials, labor, utilities, other costs of revenues, SG&A and other non-operating expenses (income) attributable to each segment.

(c)Corporate expenses that are directly incurred by a segment are reflected in each segment’s income. The remaining Corporate expenses for executive management, accounting, information technology, legal, human resources, treasury, investor relations, corporate development, tax, purchasing, and marketing not directly incurred by a segment are allocated to the segments primarily based on total net revenue.

Capital expenditures by segment for the six months ended June 30, 2026 and 2025 were as follows:

| (thousands of U.S. dollars) | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- |
| Sterigenics | $77,413 | $36,501 |
| Nordion | 7,660 | 10,058 |
| Nelson Labs | 7,542 | 4,588 |
| Total capital expenditures | $92,615 | $51,147 |

Total assets and depreciation and amortization expense by segment are not readily available and are not reported separately to the CODM.

A reconciliation of segment income to consolidated income before income taxes is as follows:

| (thousands of U.S. dollars) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- | --- | --- |
| Segment income | $165,739 | $150,735 | $300,392 | $272,574 |
| Less adjustments: |  |  |  |  |
| Interest expense, net | 34,405 | 40,651 | 69,150 | 81,527 |
| Depreciation and amortization(a) | 33,328 | 34,948 | 64,072 | 75,682 |
| Share-based compensation(b) | 7,383 | 8,149 | 21,825 | 15,418 |
| Loss on refinancing of debt(c) | 936 | 80 | 936 | 80 |
| Gain on foreign currency and derivatives not designated as hedging instruments, net(d) | (4,270) | (3,018) | (3,646) | (1,127) |
| Business optimization expenses(e) | 1,923 | 2,430 | 2,880 | 4,477 |
| Professional services relating to EO sterilization facilities(f) | 13,349 | 14,035 | 23,204 | 26,363 |
| Illinois EO litigation settlements(g) | — | 34,000 | — | 64,943 |
| Accretion of asset retirement obligation(h) | 634 | 563 | 1,307 | 1,137 |
| Consolidated income before taxes | $78,051 | $18,897 | $120,664 | $4,074 |

(a)Includes depreciation of Co-60 held at gamma irradiation sites and excludes accelerated depreciation associated with business optimization activities.

(b)Represents share-based compensation expense related to employees and Non-Employee Directors.

Sotera Health Company

Notes to Consolidated Financial Statements

(c)Represents the write-off of unamortized debt issuance costs and discounts, as well as certain other costs incurred related to the Refinancing Term Loans and the Revolving Credit Facility.

(d)Represents the effects of (i) fluctuations in foreign currency exchange rates and (ii) non-cash mark-to-fair value of embedded derivatives relating to certain customer and supply contracts at Nordion.

(e)Represents (i) certain costs related to divestitures, acquisitions and the integration of acquisitions, (ii) professional fees and other costs associated with business optimization, cost saving and other process enhancement projects, and (iii) legal, consulting, and other fees associated with the secondary offerings and shareholder engagement.

(f)Represents litigation and other professional fees associated with our EO sterilization facilities.

(g)Represents (i) the cost to settle 97 pending and threatened EO claims against Sterigenics in Illinois pursuant to the term sheet entered into on April 3, 2025 and (ii) the cost to settle 129 pending and threatened EO claims against Sterigenics in Illinois pursuant to the term sheet entered into on July 23, 2025.

(h)Represents non-cash accretion of asset retirement obligations (“ARO”) related to Co-60 gamma and EO processing facilities, which are based on estimated site remediation costs for any future decommissioning of these facilities and are accreted over the life of the asset.

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

You should read the following discussion and analysis in conjunction with our consolidated financial statements and related notes included in Part I, Item 1 of this Quarterly Report on Form 10-Q, as well as the audited consolidated financial statements and notes and Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our 2025 Form 10-K. This discussion and analysis contains forward-looking statements that are based on management’s current expectations, estimates and projections about our business and operations. Our actual results may differ materially from those currently anticipated and expressed in such forward-looking statements as a result of various factors, including the factors we describe in the section entitled Part II, Item 1A, “Risk Factors” in this Quarterly Report on Form 10-Q, as well as Part I, Item 1A, “Risk Factors” in our 2025 Form 10-K.

### OVERVIEW

We are a leading global provider of mission-critical end-to-end sterilization solutions, lab testing and advisory services for the healthcare industry. We are driven by our mission: Safeguarding Global Health®. We provide end-to-end sterilization as well as microbiological and analytical lab testing and advisory services to help ensure that medical, pharmaceutical and food products are safe for healthcare practitioners, patients and consumers in the United States and around the world. Our services are an essential aspect of our customers’ manufacturing processes and supply chains, helping to ensure sterilized medical products reach healthcare practitioners and patients. Most of these services are necessary for our customers to satisfy applicable government requirements.

We serve our customers throughout their product lifecycles, from product design to manufacturing and delivery, helping to ensure the sterility, effectiveness and safety of their products for the end user. We operate across two core businesses: sterilization services and lab services. Each of our businesses has a longstanding record and is a leader in its respective market, supported and connected by our core capabilities including deep end market, regulatory, technical and logistics expertise. The combination of Sterigenics, our terminal sterilization business, and Nordion, our Co-60 supply business, makes us the only vertically integrated global gamma sterilization provider in the sterilization industry. For financial reporting purposes, our sterilization services business is comprised of two reportable segments, Sterigenics and Nordion, and our lab services business constitutes a third reportable segment, Nelson Labs.

For the three and six months ended June 30, 2026, respectively, we recorded net revenues of $321.4 million and $601.4 million, net income of $53.6 million and $80.2 million, Adjusted Net Income of $74.0 million and $126.3 million, and Adjusted EBITDA of $165.7 million and $300.4 million. Adjusted Net Income and Adjusted EBITDA are financial measures not based on any standardized methodology prescribed by GAAP. For the definition of Adjusted Net Income and Adjusted EBITDA and the reconciliation of these non-GAAP measures from net income (loss), please see “Non-GAAP Financial Measures.”

### CONSOLIDATED RESULTS OF OPERATIONS

### Three Months Ended June 30, 2026 as compared to Three Months Ended June 30, 2025

The following table sets forth the components of our results of operations for the three months ended June 30, 2026 and 2025:

| (thousands of U.S. dollars) | 2026 | 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Total net revenues | $321,375 | $294,341 | $27,034 | 9.2% |
| Total cost of revenues | 143,412 | 127,720 | 15,692 | 12.3% |
| Net income | 53,643 | 7,962 | 45,681 | 573.7% |
| Adjusted Net Income(a) | 73,961 | 56,062 | 17,899 | 31.9% |
| Adjusted EBITDA(a) | 165,739 | 150,735 | 15,004 | 10.0% |

(a)Adjusted Net Income and Adjusted EBITDA are non-GAAP financial measures. For more information regarding our calculation of Adjusted Net Income and Adjusted EBITDA, including information about their limitations as tools for analysis and a reconciliation of net income, the most directly comparable financial measure calculated and presented in accordance with GAAP, to Adjusted Net Income and Adjusted EBITDA, please see the reconciliation included below in “Non-GAAP Financial Measures.”

### Total Net Revenues

The following table compares our revenues by type for the three months ended June 30, 2026 to the three months ended June 30, 2025.

| (thousands of U.S. dollars) / Net revenues for the three months ended June 30, | 2026 | 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Service | $278,325 | $257,244 | $21,081 | 8.2% |
| Product | 43,050 | 37,097 | 5,953 | 16.0% |
| Total net revenues | $321,375 | $294,341 | $27,034 | 9.2% |

Net revenues were $321.4 million for the three months ended June 30, 2026, an increase of $27.0 million, or 9.2%, as compared to the three months ended June 30, 2025. Excluding the impact of foreign currency exchange rates, net revenues for the three months ended June 30, 2026 increased approximately 8.0% compared with the three months ended June 30, 2025.

Service revenues

Service revenues increased $21.1 million, or 8.2%, to $278.3 million for the three months ended June 30, 2026 as compared to $257.2 million for the three months ended June 30, 2025. The growth in net service revenues was primarily driven by pricing in the Sterigenics and Nelson Labs segments, favorable volume/mix across all three segments and changes in foreign currency exchange rates.

Product revenues

Product revenues increased $6.0 million, or 16.0%, to $43.1 million for the three months ended June 30, 2026 as compared to $37.1 million for the three months ended June 30, 2025. The increase was driven by higher revenues from Co-60 in the Nordion segment due to the timing of reactor harvest schedules and favorable pricing, partially offset by changes in foreign currency exchange rates.

### Total Cost of Revenues

The following table compares our cost of revenues by type for the three months ended June 30, 2026 to the three months ended June 30, 2025:

| (thousands of U.S. dollars) / Cost of revenues for the three months ended June 30, | 2026 | 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Service | $126,840 | $113,293 | $13,547 | 12.0% |
| Product | 16,572 | 14,427 | 2,145 | 14.9% |
| Total cost of revenues | $143,412 | $127,720 | $15,692 | 12.3% |

Total cost of revenues accounted for approximately 44.6% and 43.4% of our consolidated net revenues for the three months ended June 30, 2026 and 2025, respectively.

Cost of service revenues

Cost of service revenues increased $13.5 million, or 12.0%, for the three months ended June 30, 2026 as compared to the three months ended June 30, 2025. The increase was driven by higher employee compensation costs and depreciation from capital assets recently placed into service. Changes in foreign currency exchange rates resulted in an unfavorable impact to cost of service revenues for the three months ended June 30, 2026.

Cost of product revenues

Cost of product revenues increased $2.1 million, or 14.9%, for the three months ended June 30, 2026 as compared to the three months ended June 30, 2025. The increase was primarily a result of higher volumes of Co-60 shipments due to the timing of reactor harvest schedules, which resulted in increases in direct material and transportation costs.

### SG&A Expenses

SG&A expenses decreased $0.7 million, or 1.1%, for the three months ended June 30, 2026 as compared to the three months ended June 30, 2025, driven mainly by a decrease in litigation and other professional services expenses.

### Amortization of intangible assets

Amortization of intangible assets decreased $6.3 million to $3.0 million, or 67.6%, for the three months ended June 30, 2026 as compared to the three months ended June 30, 2025. The decline was primarily due to certain intangible assets that were fully amortized in May 2025.

### Interest Expense, Net

Interest expense, net decreased $6.2 million, or 15.4%, for the three months ended June 30, 2026 as compared to the three months ended June 30, 2025, primarily due to a lower interest rate on our Term Loan and a $75.0 million principal paydown. The weighted average interest rate on our outstanding debt was 6.49% and 7.49% for the three months ended June 30, 2026 and 2025, respectively.

### Loss on Refinancing of Debt

Loss on refinancing of debt for the three months ended June 30, 2026 was $0.9 million related to Amendment No. 7 to the Credit Agreement. Loss on refinancing of debt for the three months ended June 30, 2025 was $0.1 million related to Amendment No. 5 to the Credit Agreement. The refinancing activity resulted in the write off of certain unamortized debt issuance costs and discounts on the Term Loans. In addition, certain new debt issuance costs and discounts were expensed in connection with the Credit Agreement amendments.

### Foreign Exchange (Gain) Loss

Foreign exchange gain was $3.7 million for the three months ended June 30, 2026 as compared to a loss of $0.6 million for the three months ended June 30, 2025. The change in foreign exchange (gain) loss in our Consolidated Statements of Operations and Comprehensive Income mainly relates to short-term gains and losses on transactions and certain assets and liabilities denominated in currencies other than the functional currency of our operating entities.

### Other Income, Net

Other income, net decreased $3.0 million, or 51.0%, for the three months ended June 30, 2026 as compared to the three months ended June 30, 2025, mainly arising from an unfavorable decrease in the net fair value of Nordion’s embedded derivatives for the three months ended June 30, 2026 compared to the same period of the prior year.

### Provision for Income Taxes

Provision for income taxes increased $13.5 million to a net provision of $24.4 million for the three months ended June 30, 2026 as compared to $10.9 million for the three months ended June 30, 2025. The change was primarily attributable to higher pre-tax income for the three months ended June 30, 2026 compared to the three months ended June 30, 2025, partially offset by a decrease in the impact of the valuation allowance attributable to the limitation on the deductibility of interest expense.

Provision for income taxes for the three months ended June 30, 2026 differed from the federal statutory rate primarily due to the foreign rate differential, current year permanent differences, including foreign withholding taxes and other non-deductible items, and U.S. state income taxes (net of federal tax benefit). Income tax expense for the three months ended June 30, 2025 differed from the statutory rate primarily due to the valuation allowance attributable to the limitation on the deductibility of interest expense, the impact of the foreign rate differential and current year permanent tax differences, partially offset by a benefit for state income taxes.

### Net Income, Adjusted Net Income and Adjusted EBITDA

Net income for the three months ended June 30, 2026 was $53.6 million as compared to net income of $8.0 million for the three months ended June 30, 2025 due to the factors described above. Adjusted Net Income was $74.0 million for the three months ended June 30, 2026, as compared to $56.1 million for the three months ended June 30, 2025, and Adjusted EBITDA was $165.7 million for the three months ended June 30, 2026 as compared to $150.7 million for the three months ended June 30, 2025. Please see “Non-GAAP Financial Measures” below for a reconciliation of Adjusted Net Income and Adjusted EBITDA to their most directly comparable financial measure calculated and presented in accordance with GAAP.

### Six Months Ended June 30, 2026 as compared to Six Months Ended June 30, 2025:

The following table sets forth the components of our results of operations for the six months ended June 30, 2026 and 2025.

| (thousands of U.S. dollars) | 2026 | 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Total net revenues | $601,420 | $548,864 | $52,556 | 9.6% |
| Total cost of revenues | 276,388 | 246,811 | 29,577 | 12.0% |
| Net income (loss) | 80,232 | (5,298) | 85,530 | 1614.4% |
| Adjusted Net Income(a) | 126,327 | 95,106 | 31,221 | 32.8% |
| Adjusted EBITDA(a) | 300,392 | 272,574 | 27,818 | 10.2% |

(a)Adjusted Net Income and Adjusted EBITDA are non-GAAP financial measures. For more information regarding our calculation of Adjusted Net Income and Adjusted EBITDA, including information about their limitations as tools for analysis and a reconciliation of net income (loss), the most directly comparable financial measure calculated and presented in accordance with GAAP, to Adjusted Net Income and Adjusted EBITDA, please see the reconciliation included below in “Non-GAAP Financial Measures.”

### Total Net Revenues

The following table compares our net revenues by type for the six months ended June 30, 2026 to the six months ended June 30, 2025:

| (thousands of U.S. dollars) / Net revenues for the six months ended June 30, | 2026 | 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Service | $519,933 | $481,184 | $38,749 | 8.1% |
| Product | 81,487 | 67,680 | 13,807 | 20.4% |
| Total net revenues | $601,420 | $548,864 | $52,556 | 9.6% |

Net revenues were $601.4 million for the six months ended June 30, 2026, an increase of $52.6 million, or 9.6%, as compared to the six months ended June 30, 2025. Excluding the impact of foreign currency exchange rates, net revenues for the six months ended June 30, 2026 increased approximately 7.4% compared with the six months ended June 30, 2025.

Service revenues

Service revenues increased $38.7 million, or 8.1%, to $519.9 million for the six months ended June 30, 2026 as compared to $481.2 million for the six months ended June 30, 2025. The growth in net service revenues was primarily driven by pricing in the Sterigenics and Nelson Labs segments, favorable volume/mix in the Sterigenics and Nordion segments and changes in foreign currency exchange rates.

Product revenues

Product revenues increased $13.8 million, or 20.4%, to $81.5 million for the six months ended June 30, 2026 as compared to $67.7 million for the six months ended June 30, 2025. The increase was driven by higher revenues from Co-60 in the Nordion segment due to the timing of reactor harvest schedules and favorable pricing.

### Total Cost of Revenues

The following table compares our total cost of revenues by type for the six months ended June 30, 2026 to the six months ended June 30, 2025:

| (thousands of U.S. dollars) / Cost of revenues for the six months ended June 30, | 2026 | 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Service | $245,668 | $220,922 | $24,746 | 11.2% |
| Product | 30,720 | 25,889 | 4,831 | 18.7% |
| Total cost of revenues | $276,388 | $246,811 | $29,577 | 12.0% |

Total cost of revenues accounted for approximately 46.0% and 45.0% of our consolidated net revenues for the six months ended June 30, 2026 and 2025, respectively.

Cost of service revenues

Cost of service revenues increased $24.7 million, or 11.2%, for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025. The increase was driven by higher employee compensation costs, depreciation from capital assets recently placed into service, as well as expenditures for facility maintenance and direct materials. Changes in foreign currency exchange rates also had an unfavorable impact to cost of service revenues for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025.

Cost of product revenues

Cost of product revenues increased $4.8 million, or 18.7%, for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025. The increase was primarily a result of higher volumes of Co-60 shipments due to the timing of reactor harvest schedules, which resulted in increases in direct material and transportation costs.

### SG&A expenses

SG&A expenses increased $4.4 million, or 3.3%, for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025. The increase was primarily driven by higher employee compensation costs mainly attributable to share-based compensation expense, partially offset by a decrease in litigation and other professional services expenses.

### Amortization of intangible assets

Amortization of intangible assets decreased $18.6 million to $6.0 million, or 75.4%, for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025. The decline was primarily due to certain intangible assets that were fully amortized in May 2025.

### Interest Expense, Net

Interest expense, net decreased $12.4 million, or 15.2%, for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025, primarily due to a lower variable interest rate on our Term Loan and a $75.0 million principal paydown. The weighted average interest rate on our outstanding debt was 6.56% and 7.53% for the six months ended June 30, 2026 and 2025, respectively.

### Loss on Refinancing of Debt

Loss on refinancing of debt for the six months ended June 30, 2026 was $0.9 million related to Amendment No. 7 to the Credit Agreement. Loss on refinancing of debt for the six months ended June 30, 2025 was $0.1 million related to Amendment No. 5 to the Credit Agreement. The refinancing activity resulted in the write off of certain unamortized debt issuance costs and discounts on the Term Loans. In addition, certain new debt issuance costs and discounts were expensed in connection with the Credit Agreement amendments.

### Foreign Exchange (Gain) Loss

Foreign exchange gain was $4.3 million for the six months ended June 30, 2026 as compared to a $0.9 million loss for the six months ended June 30, 2025. The change in foreign exchange (gain) loss in our Consolidated Statements of Operations and Comprehensive Income mainly relates to short-term gains and losses on transactions and certain assets and liabilities denominated in currencies other than the functional currency of our operating entities.

### Other Income, Net

Other income, net decreased $2.3 million, or 37.1%, for the six months ended June 30, 2026 as compared to the six months ended June 30, 2025, mainly arising from an unfavorable change in the net fair value of Nordion’s embedded derivatives for the six months ended June 30, 2026 compared to the same period of the prior year.

### Provision for Income Taxes

Provision for income taxes increased $31.1 million to a net provision of $40.4 million for the six months ended June 30, 2026 as compared to $9.4 million for the six months ended June 30, 2025. The change was primarily attributable to higher pre-tax income for the six months ended June 30, 2026 compared to the six months ended June 30, 2025, partially offset by a decrease in the impact of the valuation allowance attributable to the limitation on the deductibility of interest expense.

Provision for income taxes for the six months ended June 30, 2026 differed from the federal statutory rate primarily due to the foreign rate differential, current year permanent differences, including foreign withholding taxes and other non-deductible items, and U.S. state income taxes (net of federal tax benefit). Income tax expense for the six months ended June 30, 2025 differed from the statutory rate primarily due to the valuation allowance attributable to the limitation on the deductibility of interest expense, the impact of the foreign rate differential and current year permanent tax differences, partially offset by a benefit for state income taxes.

### Net Income (Loss), Adjusted Net Income and Adjusted EBITDA

Net income for the six months ended June 30, 2026 was $80.2 million as compared to net loss of $5.3 million for the six months ended June 30, 2025 due to the factors described above. Adjusted Net Income was $126.3 million for the six months ended June 30, 2026 as compared to $95.1 million for the six months ended June 30, 2025, and Adjusted EBITDA was $300.4 million for the six months ended June 30, 2026, as compared to $272.6 million for the six months ended June 30, 2025. Please see “Non-GAAP Financial Measures” below for a reconciliation of Adjusted Net Income and Adjusted EBITDA to their most directly comparable financial measure calculated and presented in accordance with GAAP.

### NON-GAAP FINANCIAL MEASURES

To supplement our consolidated financial statements presented in accordance with GAAP, we consider Adjusted Net Income and Adjusted EBITDA, financial measures that are not based on any standardized methodology prescribed by GAAP.

We define Adjusted Net Income as net income before amortization and certain other adjustments that we do not consider in our evaluation of our ongoing operating performance from period to period as discussed further below. We define Adjusted EBITDA as Adjusted Net Income before interest expense, depreciation (including depreciation of Co-60 used in our operations) and income tax provision applicable to Adjusted Net Income.

We use Adjusted Net Income and Adjusted EBITDA, non-GAAP financial measures, as the principal measures of our operating performance. Management believes Adjusted Net Income and Adjusted EBITDA are useful because they allow management to more effectively evaluate our operating performance and compare the results of our operations from period to period without the impact of certain non-cash items and non-routine items that we do not expect to continue at the same level in the future and other items that are not core to our operations. We believe that these measures are useful to our investors because they provide a more complete understanding of the factors and trends affecting our business than could be obtained absent this disclosure. In addition, we believe Adjusted Net Income and Adjusted EBITDA will assist investors in making comparisons to our historical operating results and analyzing the underlying performance of our operations for the periods presented. Our management also uses Adjusted Net Income and Adjusted EBITDA in its financial analysis and operational decision-making, and Adjusted EBITDA serves as the basis for the metric we utilize to determine attainment of our primary annual incentive program. Adjusted Net Income and Adjusted EBITDA may be calculated differently from, and therefore may not be comparable to, a similarly titled measure used by other companies.

Adjusted Net Income and Adjusted EBITDA should not be considered in isolation from, or as a substitute for, financial information prepared in accordance with GAAP. There are a number of limitations related to the use of Adjusted Net Income and Adjusted EBITDA rather than net income (loss), the nearest GAAP equivalent. For example, Adjusted Net Income and Adjusted EBITDA primarily exclude:

- certain recurring non-cash charges such as depreciation of fixed assets, although these assets may have to be replaced in the future, as well as amortization of acquired intangible assets and ARO;
- costs of acquiring and integrating businesses, which will continue to be a part of our growth strategy;
- non-cash gains or losses from fluctuations in foreign currency exchange rates and the mark-to-fair value of derivatives not designated as hedging instruments, which includes the embedded derivatives relating to certain customer and supply contracts at Nordion;
- impairment charges on long-lived assets, intangible assets and investments accounted for under the equity method;
- loss on refinancing of debt incurred in connection with refinancing or early extinguishment of long-term debt;
- expenses incurred in connection with the secondary offering of our common stock and other shareholder activities;
- expenses and charges related to the litigation, settlement agreements, and other activities associated with our EO sterilization facilities, including those related to Willowbrook, Illinois, Atlanta, Georgia, Santa Teresa, New Mexico and Vernon, California;
- in the case of Adjusted EBITDA, interest expense or the cash requirements necessary to service interest or principal payments on our indebtedness; and
- share-based compensation expense, which has been, and will continue to be for the foreseeable future, a significant recurring expense and an important part of our compensation strategy.

In evaluating Adjusted Net Income and Adjusted EBITDA, you should be aware that in the future, we will incur expenses similar to the adjustments in this presentation. Our presentations of Adjusted Net Income and Adjusted EBITDA should not be construed as suggesting that our future results will be unaffected by these expenses or any unusual or non-recurring items. When evaluating our performance, you should consider Adjusted Net Income and Adjusted EBITDA alongside other financial performance measures, including our net income (loss) and other GAAP measures.

The following table presents a reconciliation of net income (loss), the most directly comparable financial measure calculated and presented in accordance with GAAP to Adjusted Net Income and Adjusted EBITDA, for each of the periods indicated:

| (thousands of U.S. dollars) | 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 (loss) | $53,643 | $7,962 | $80,232 | $(5,298) |
| Amortization of intangible assets | 5,563 | 11,924 | 11,165 | 30,598 |
| Share-based compensation(a) | 7,383 | 8,149 | 21,825 | 15,418 |
| Loss on refinancing of debt(b) | 936 | 80 | 936 | 80 |
| Gain on foreign currency and derivatives not designated as hedging instruments, net(c) | (4,270) | (3,018) | (3,646) | (1,127) |
| Business optimization expenses(d) | 1,923 | 2,430 | 2,880 | 4,477 |
| Professional services relating to EO sterilization facilities(e) | 13,349 | 14,035 | 23,204 | 26,363 |
| Illinois EO litigation settlements(f) | — | 34,000 | — | 64,943 |
| Accretion of asset retirement obligations(g) | 634 | 563 | 1,307 | 1,137 |
| Income tax benefit associated with pre-tax adjustments(h) | (5,200) | (20,063) | (11,576) | (41,485) |
| Adjusted Net Income | 73,961 | 56,062 | 126,327 | 95,106 |
| Interest expense, net | 34,405 | 40,651 | 69,150 | 81,527 |
| Depreciation(i) | 27,765 | 23,024 | 52,907 | 45,084 |
| Income tax provision applicable to Adjusted Net Income(j) | 29,608 | 30,998 | 52,008 | 50,857 |
| Adjusted EBITDA(k) | $165,739 | $150,735 | $300,392 | $272,574 |

(a) Represents share-based compensation expense related to employees and Non-Employee Directors.

(b) Represents the write-off of unamortized debt issuance costs and discounts, as well as certain other costs incurred related to the Refinancing Term Loans and the Revolving Credit Facility.

(c) Represents the effects of (i) fluctuations in foreign currency exchange rates and (ii) non-cash mark-to-fair value of embedded derivatives relating to certain customer and supply contracts at Nordion.

(d) Represents (i) certain costs related to divestitures, acquisitions and the integration of acquisitions, (ii) professional fees and other costs associated with business optimization, cost saving and other process enhancement projects, and (iii) legal, consulting, and other fees associated with the secondary offerings and shareholder engagement.

(e) Represents litigation and other professional fees associated with our EO sterilization facilities.

(f) Represents (i) the cost to settle 97 pending and threatened EO claims against Sterigenics in Illinois pursuant to the term sheet entered into on April 3, 2025 and (ii) the cost to settle 129 pending and threatened EO claims against Sterigenics in Illinois pursuant to the term sheet entered into on July 23, 2025.

(g) Represents non-cash accretion of ARO related to Co-60 gamma and EO processing facilities, which are based on estimated site remediation costs for any future decommissioning of these facilities and are accreted over the life of the asset.

(h) Represents the income tax impact of adjustments calculated based on the tax rate applicable to each item. We eliminate the effect of tax rate changes as applied to tax assets and liabilities and unusual items from our presentation of adjusted net income.

(i) Includes depreciation of Co-60 held at gamma irradiation sites and excludes accelerated depreciation associated with business optimization activities.

(j) Represents the difference between the income tax provision as determined under GAAP and the income tax benefit associated with pre-tax adjustments described in footnote (h).

(k) $28.9 million and $24.4 million of the adjustments for the three months ended June 30, 2026 and 2025, respectively, and $55.2 million and $48.6 million of the adjustments for the six months ended June 30, 2026 and 2025, respectively, are included in cost of revenues, primarily consisting of amortization of intangible assets, depreciation, and accretion of asset retirement obligations.

### SEGMENT RESULTS OF OPERATIONS

We have three reportable segments: Sterigenics, Nordion and Nelson Labs. Our CODM evaluates performance and allocates resources within our business based on segment income, which excludes certain items which are included in income before income tax as determined in our Consolidated Statements of Operations and Comprehensive Income. The accounting policies for our reportable segments are the same as those for the consolidated Company.

### Our Segments

### Sterigenics

Sterigenics provides outsourced terminal sterilization and irradiation services for the medical device, pharmaceutical, food safety and advanced applications markets using four major technologies: gamma irradiation, EO processing, E-beam and X-Ray irradiation.

### Nordion

Our Nordion business is a leading global provider of Co-60 used in the sterilization and irradiation processes for the medical device, pharmaceutical, food safety, and high-performance materials industries, as well as in the treatment of cancer. In addition, Nordion is a leading global provider of gamma irradiation systems.

As a result of the time required to meet regulatory and logistics requirements for delivery of radioactive products, combined with accommodations that we make to our customers to minimize disruptions to their operations during the installation of Co-60, Nordion sales patterns can often vary significantly from one quarter to the next. In most cases, however, timing-related impacts on our sales performance tend to be resolved within several quarters, resulting in more consistent performance over longer periods of time. In addition, sales of gamma irradiation systems occur infrequently and tend to be for larger amounts. Nordion’s results of operations are also impacted by Co-60 harvest schedules.

### Nelson Labs

Our Nelson Labs business provides outsourced microbiological and analytical chemistry testing and advisory services for the medical device and pharmaceutical industries.

For more information regarding our reportable segments, please refer to Note 15, “Segment Information” to our consolidated financial statements.

### Segment Results for the Three Months Ended June 30, 2026 and 2025

The following tables compare segment net revenue and segment income for the three months ended June 30, 2026 to the three months ended June 30, 2025:

| (thousands of U.S. dollars) | Three Months Ended June 30, 2026 | Three Months Ended June 30, 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Net Revenues |  |  |  |  |
| Sterigenics | $211,571 | $194,839 | $16,732 | 8.6% |
| Nordion | 49,149 | 42,431 | 6,718 | 15.8% |
| Nelson Labs | 60,655 | 57,071 | 3,584 | 6.3% |
| Segment Income |  |  |  |  |
| Sterigenics | $118,125 | $107,745 | $10,380 | 9.6% |
| Nordion | 27,980 | 23,477 | 4,503 | 19.2% |
| Nelson Labs | 19,634 | 19,513 | 121 | 0.6% |
| Segment Income margin |  |  |  |  |
| Sterigenics | 55.8% | 55.3% |  |  |
| Nordion | 56.9% | 55.3% |  |  |
| Nelson Labs | 32.4% | 34.2% |  |  |

Net Revenues by Segment

Sterigenics net revenues were $211.6 million for the three months ended June 30, 2026, an increase of $16.7 million, or 8.6%, as compared to the three months ended June 30, 2025. The increase is attributable to favorable pricing of 4.3%, volume and mix of 2.7% as well as favorable changes in foreign currency exchange rates of 1.6%.

Nordion net revenues were $49.1 million for the three months ended June 30, 2026, an increase of $6.7 million, or 15.8%, as compared to the three months ended June 30, 2025. Revenue growth was driven mainly by volume and mix of 13.6%, which was largely attributable to favorable Co-60 harvest schedule timing, coupled with a favorable impact from pricing of 3.1%, partially offset by changes in foreign currency exchange rates.

Nelson Labs net revenues were $60.7 million for the three months ended June 30, 2026, an increase of $3.6 million, or 6.3%, as compared to the three months ended June 30, 2025. The increase is attributable to favorable impacts from pricing of 2.8%, volume and mix of 2.6% and changes in foreign currency exchange rates.

Segment Income

Sterigenics segment income was $118.1 million for the three months ended June 30, 2026, an increase of $10.4 million, or 9.6%, as compared to the three months ended June 30, 2025. The increase in segment income and segment income margin was primarily a result of favorable customer pricing, increases in volume and mix, partially offset by inflation.

Nordion segment income was $28.0 million for the three months ended June 30, 2026, an increase of $4.5 million, or 19.2%, as compared to the three months ended June 30, 2025. The increase in segment income and segment income margin was primarily driven by higher volume and mix due to favorable Co-60 harvest schedule timing, along with favorable changes in pricing and foreign currency exchange rates, partially offset by inflation.

Nelson Labs segment income was $19.6 million for the three months ended June 30, 2026, an increase of $0.1 million, or 0.6%, as compared to the three months ended June 30, 2025. Segment income increased as a result of favorable pricing and volume/mix. Segment income margin decreased due to higher costs.

### Segment Results for the Six Months Ended June 30, 2026 and 2025

The following tables compare segment net revenue and segment income for the six months ended June 30, 2026 to the six months ended June 30, 2025:

| (thousands of U.S. dollars) | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 | $ Change | % Change |
| --- | --- | --- | --- | --- |
| Net Revenues |  |  |  |  |
| Sterigenics | $397,706 | $364,523 | $33,183 | 9.1% |
| Nordion | 91,158 | 74,988 | 16,170 | 21.6% |
| Nelson Labs | 112,556 | 109,353 | 3,203 | 2.9% |
| Segment Income |  |  |  |  |
| Sterigenics | $214,539 | $195,749 | $18,790 | 9.6% |
| Nordion | 51,691 | 40,899 | 10,792 | 26.4% |
| Nelson Labs | 34,162 | 35,926 | (1,764) | (4.9)% |
| Segment Income margin |  |  |  |  |
| Sterigenics | 53.9% | 53.7% |  |  |
| Nordion | 56.7% | 54.5% |  |  |
| Nelson Labs | 30.4% | 32.9% |  |  |

Net Revenues by Segment

Sterigenics net revenues were $397.7 million for the six months ended June 30, 2026, an increase of $33.2 million, or 9.1%, as compared to the six months ended June 30, 2025. The increase is attributable to favorable pricing of 4.4%, volume and mix of 2.2% as well as changes in foreign currency exchange rates of 2.5%.

Nordion net revenues were $91.2 million for the six months ended June 30, 2026, an increase of $16.2 million, or 21.6%, as compared to the six months ended June 30, 2025. Revenue growth was driven mainly by volume and mix of 18.1%, which was largely attributable to favorable Co-60 harvest schedule timing, coupled with a favorable impact from pricing of 2.7% and changes in foreign currency exchange rates.

Nelson Labs net revenues were $112.6 million for the six months ended June 30, 2026, an increase of $3.2 million, or 2.9%, as compared to the six months ended June 30, 2025. The increase is attributable to favorable impacts from pricing and changes in foreign currency exchange rates of 2.8% and 2.0%, respectively, partially offset by an unfavorable change in volume and mix.

Segment Income

Sterigenics segment income was $214.5 million for the six months ended June 30, 2026, an increase of $18.8 million, or 9.6%, as compared to the six months ended June 30, 2025. The increase in segment income was primarily a result of favorable customer pricing, increases in volume and mix, partially offset by inflation.

Nordion segment income was $51.7 million for the six months ended June 30, 2026, an increase of $10.8 million, or 26.4%, as compared to the six months ended June 30, 2025. The increase in segment income and segment income margin was primarily driven by higher volume and mix due to favorable Co-60 harvest schedule timing, along with favorable changes in pricing and foreign currency exchange rates, partially offset by inflation.

Nelson Labs segment income was $34.2 million for the six months ended June 30, 2026, a decrease of $1.8 million, or 4.9%, as compared to the six months ended June 30, 2025. Segment income and segment income margin decreased as a result of lower volume/mix and increases in other direct costs, partially offset by favorable pricing.

### LIQUIDITY AND CAPITAL RESOURCES

### Sources of Cash

The primary sources of liquidity for our business are cash flows from operations and borrowings under our credit facilities. As of June 30, 2026, we had $356.7 million of cash and cash equivalents. This is an increase of $10.3 million from the balance at December 31, 2025. The increase in cash and cash equivalents was primarily attributable to $117.9 million of cash flows provided by operating activities, reduced by $92.6 million of cash paid for purchases of property, plant and equipment and $15.2 million of cash used in financing activities. Our foreign subsidiaries held cash of approximately $306.5 million at June 30, 2026 and $253.4 million at December 31, 2025. No material restrictions exist on accessing cash held by our foreign subsidiaries notwithstanding any potential tax consequences.

### Uses of Cash

We expect that cash on hand, operating cash flows and amounts available under our credit facilities will provide sufficient working capital to operate our business, meet foreseeable liquidity requirements (inclusive of debt service on our long-term debt), make expected capital expenditures including investments in fixed assets to build and/or expand existing facilities, and meet litigation costs that we expect to continue to incur for at least the next twelve months and the foreseeable future thereafter. Our primary long-term liquidity requirements beyond the next 12 months will be to service our debt, make capital expenditures, and fund suitable business acquisitions. As of June 30, 2026, there were no outstanding borrowings on the Revolving Credit Facility. We expect any excess cash provided by operations will be allocated to fund capital expenditures, potential acquisitions, or for other general corporate purposes. Our ability to meet future working capital, capital expenditures and debt service requirements will depend on our future financial performance, which will be affected by a range of macroeconomic, competitive and business factors, including interest rate changes and changes in our industry, many of which are outside of our control.

### Capital Expenditures

Our capital expenditure program is a component of our long-term strategy. This program includes, among other things, investments in new and existing facilities, business expansion projects, Co-60 used by Sterigenics at its gamma irradiation facilities, cobalt development projects and information technology enhancements. During the six months ended June 30, 2026, our capital expenditures amounted to $92.6 million, compared to $51.1 million for the six months ended June 30, 2025.

### Cash Flow Information

### Six Months Ended June 30, 2026 compared to the Six Months Ended June 30, 2025

| (thousands of U.S. dollars) | Six Months Ended June 30, 2026 | Six Months Ended June 30, 2025 |
| --- | --- | --- |
| Net Cash Provided by (Used in): |  |  |
| Operating activities | $117,930 | $112,937 |
| Investing activities | (88,427) | (51,110) |
| Financing activities | (15,184) | (15,020) |
| Effect of foreign currency exchange rate changes on cash and cash equivalents | (4,048) | 8,600 |
| Net increase in cash and cash equivalents, including restricted cash | $10,271 | $55,407 |

Operating activities

Cash flows provided by operating activities increased $5.0 million to net cash provided of $117.9 million for the six months ended June 30, 2026 compared to $112.9 million of net cash provided by operating activities for the six months ended June 30, 2025. The increase in cash flows provided by operating activities was primarily driven by higher gross profit and a decrease in cash paid for interest, partially offset by the $34.0 million payment of the Illinois EO litigation settlement paid in February 2026.

Investing activities

Cash used in investing activities increased $37.3 million to net cash used of $88.4 million for the six months ended June 30, 2026 compared to $51.1 million for the six months ended June 30, 2025. The variance was primarily driven by an increase in cash paid for capital expenditures of $41.5 million for the six months ended June 30, 2026 compared to the six months ended June 30, 2025.

Financing activities

Cash used in financing activities increased $0.2 million to net cash used of $15.2 million for the six months ended June 30, 2026 compared to $15.0 million for the six months ended June 30, 2025. The increase in cash used in financing activities was mainly attributable to a $5.4 million increase in cash used in shares withheld for employee taxes on equity awards, partially offset by a $4.0 million decrease in cash paid for repayments of debt and a $1.4 million decrease in cash paid for debt issuance costs.

### Debt Facilities

On December 13, 2019, SHH, our wholly owned subsidiary, entered into the Senior Secured Credit Facilities consisting of both the Term Loan and the Revolving Credit Facility pursuant to a first lien credit agreement. The total borrowing capacity under the Revolving Credit Facility is $600.0 million. The Senior Secured Credit Facilities also provide SHH the right at any time and under certain conditions to request incremental term loans or incremental revolving credit commitments based on a formula defined in the Senior Secured Credit Facilities.

On May 20, 2026, SHH, the Company, certain subsidiaries of the Company, each 2026 Refinancing Term Lender (as defined in the Credit Agreement) and JPMorgan Chase Bank, N.A., as first lien Administrative Agent entered into Amendment No. 7 to the Credit Agreement (“Amendment No. 7”). Among other changes, Amendment No. 7 provides for refinancing lenders to provide repriced Term Loans to SHH in an aggregate principal amount of $1,415.9 million. Amendment No. 7 reduced the interest rate spread by 0.25% across Term Loans under the facility. The Term Loans under the credit facility shall have an applicable interest rate margin equal to Adjusted Term SOFR (as defined in the Credit Agreement) plus 2.25%, with a 0.00% floor (with optionality for the Company to elect Alternate Base Rate plus 1.25% or Adjusted Daily Simple SOFR plus 2.25% (each as defined in the Credit Agreement)). The Term Loans are also subject to a “soft call” premium of 1.00% for certain repricing transactions with respect to the Term Loans that occur within the six-month period after the effective date of the Amendment. The Term Loans amortize at a rate of 1.00% per annum and mature on May 30, 2031.

On May 30, 2024, SHH, the Company, certain subsidiaries of the Company, and Wilmington Trust, National Association, as trustee, paying agent, registrar, transfer agent and notes collateral agent, entered into the Indenture governing SHH’s $750.0 million aggregate principal amount of the Secured Notes issued in May 2024.

The Senior Secured Credit Facilities and the Indenture contain certain covenants and events of default. Additionally, all of SHH’s obligations under the Senior Secured Credit Facilities and the Indenture are unconditionally guaranteed by the Company and certain domestic restricted subsidiaries. For additional information about our Senior Secured Credit Facilities, the Indenture and the Secured Notes, including the covenants and events of default, refer to Note 8, “Long-Term Debt,” to our Financial Statements.

Outstanding letters of credit are collateralized by encumbrances against the Revolving Credit Facility and the collateral pledged thereunder, or by cash placed on deposit with the issuing bank. As of June 30, 2026, the Company had $8.3 million of letters of credit issued against the Revolving Credit Facility, resulting in total availability under the Revolving Credit Facility of $591.7 million.

Term Loan Interest Rate Risk Management

The Company utilizes interest rate derivatives to reduce the variability of cash flows in the interest payments associated with our variable rate debt due to changes in SOFR. For additional information on the derivative instruments described above, refer to Note 14, “Financial Instruments and Financial Risk—Derivative Instruments.”

### CRITICAL ACCOUNTING POLICIES AND ESTIMATES

The preparation of consolidated financial statements and related disclosures in conformity with GAAP requires management to make judgments, estimates and assumptions at a specific point in time and in certain circumstances that affect amounts reported in the accompanying consolidated financial statements. In preparing these consolidated financial statements, management has made its best estimates and judgments of certain amounts, giving due consideration to materiality. The application of accounting policies involves the exercise of judgment and use of assumptions as to future uncertainties and, as a result, actual results could differ from these estimates.

A comprehensive discussion of the Company’s critical accounting policies and management estimates made in connection with the preparation of the financial statements is included in Item 7 of our 2025 Form 10-K. There have been no significant changes in critical accounting policies, management estimates or accounting policies since the year ended December 31, 2025.

### NEW ACCOUNTING PRONOUNCEMENTS

For a description of recent accounting pronouncements applicable to our business, see Note 2, “Recent Accounting Standards” to our consolidated financial statements.

## Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Market risks are described within “Quantitative and Qualitative Disclosures About Market Risk” in Part II, Item 7A of our 2025 Form 10-K. These market risks have not materially changed for the three and six months ended June 30, 2026.

## Item 4. Controls and Procedures.

### Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the Company’s “disclosure controls and procedures,” (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act). Based upon their evaluation, the Chief Executive Officer and Chief Financial Officer concluded that, as of the end of the period covered by this Quarterly Report on Form 10-Q, our disclosure controls and procedures are effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the rules and forms of the Securities and Exchange Commission (the “SEC”), and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

### Changes in Internal Control

During the three months ended June 30, 2026, there were no changes in our internal control over financial reporting that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

### Part II—OTHER INFORMATION

## Item 1. Legal Proceedings.

From time to time, we may be subject to various legal proceedings arising in the ordinary course of our business, including claims relating to personal injury, property damage, workers’ compensation, employee safety, and our disclosures as a Nasdaq-listed, publicly traded company. In addition, from time to time, we receive communications from government or regulatory agencies concerning investigations or allegations of noncompliance with laws or regulations in jurisdictions in which we operate. At this time, and except as disclosed herein, we are unable to predict the outcome of, and cannot reasonably estimate the impact of, any pending litigation matters, matters concerning allegations of non-compliance with laws or regulations and matters concerning other allegations of other improprieties, or the incidence of any such matters in the future. Information regarding our legal proceedings is included below.

### Legal Proceedings Described in Note 13 “Commitments and Contingencies” of Our Consolidated Financial Statements

Note 13, “Commitments and Contingencies” to our consolidated financial statements for the three and six months ended June 30, 2026 contained in this Quarterly Report on Form 10-Q includes information on legal proceedings that constitute material contingencies for financial reporting purposes that could have a material effect on our financial condition or results of operations. This Item should be read in conjunction with Note 13 “Commitments and Contingencies” for information regarding the Ethylene Oxide Tort Litigation with respect to California, Georgia, Illinois and New Mexico, which is incorporated into this Item 1 by reference.

### Legal Proceedings Not Described in Note 13 “Commitments and Contingencies” to Our Consolidated Financial Statements

In addition to the matters that are identified in Note 13 “Commitments and Contingencies” to our consolidated financial statements for the three and six months ended June 30, 2026 contained in this Quarterly Report on Form 10-Q, and incorporated into this Item by reference, we report matters, if any, that constitute material pending legal proceedings, other than ordinary course litigation incidental to our business, to which we are or any of our subsidiaries is a party. SEC regulations require disclosure of environmental proceedings that involve a government authority and potential monetary sanctions that the Company reasonably believes will exceed a specified threshold. The Company uses a threshold of $1.0 million to determine whether the disclosure of any such proceedings is required because we believe matters under this threshold are not material to the Company.

## Item 1A. Risk Factors.

There have been no material changes from the risk factors previously described under Item 1A of our 2025 Form 10-K.

## Item 5. Other Information.

Rule 10b5-1 Trading Plans

During the three months ended June 30, 2026, none of the Company’s directors or officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted or terminated any contract, instruction or written plan for the purchase or sale of Company securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) or any “non-Rule 10b5-1 trading arrangement” (as that term is defined in Regulation S-K, Item 408).

## Item 6. Exhibits.

The exhibits listed in the following Exhibit Index are filed, furnished, or incorporated by reference as part of this Quarterly Report on Form 10-Q.

| Exhibit No | Description of Exhibits | Incorporated by Reference / Form | Incorporated by Reference / File No. | Incorporated by Reference / Exhibit | Incorporated by Reference / Filing Date | Furnished/Filed Herewith |
| --- | --- | --- | --- | --- | --- | --- |
| 10.1 | Amendment No. 7, dated as of May 20, 2026, to the First Lien Credit Agreement,dated as of December 13, 2019 by and among Sotera Health Company, Sotera Health Holdings, LLC, certain subsidiaries of Sotera Health Company, JPMorgan Chase Bank, N.A., as First Lien Administrative Agent and the 2026 Refinancing Term Lenders and issuing banks party thereto | 8-K | 001-39729 | 10.1 | 2026-05-20 |  |
| 10.2 | Employment Offer by and between Sotera Health Company and Alton E. Shader dated as of May 1, 2026 |  |  |  |  | * |
| 10.3 | Amendment to Amended and Restated Senior Management Agreement by and between Sotera Health Company and Michael B. Petras, Jr. dated as of April 30, 2026 |  |  |  |  | * |
| 31.1 | Certification of Principal Executive Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |  |  |  |  | * |
| 31.2 | Certification of Principal Financial Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 |  |  |  |  | * |
| 32.1 | Certifications of Principal Executive Officer and Principal Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 |  |  |  |  | ** |
| 101.INS | Inline XBRL Instance Document - The XBRL Instance Document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document |  |  |  |  | * |
| 101.SCH | Inline XBRL Taxonomy Extension Schema Document |  |  |  |  | * |
| 101.CAL | Inline XBRL Taxonomy Extension Calculation Linkbase Document |  |  |  |  | * |
| 101.DEF | Inline XBRL Taxonomy Extension Definition Linkbase Document |  |  |  |  | * |
| 101.LAB | Inline XBRL Taxonomy Label Linkbase Document |  |  |  |  | * |
| 101.PRE | Inline XBRL Taxonomy Extension Presentation Linkbase Document |  |  |  |  | * |
| 104 | Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101) |  |  |  |  | * |

* Filed Herewith

** Furnished Herewith

### 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.

SOTERA HEALTH COMPANY

By: /s/ Jonathan M. Lyons

Name: Jonathan M. Lyons

Title: Senior Vice President and Chief Financial Officer

(Principal Financial Officer)

Date: August 6, 2026

---

## EX-10.2

SEC source: [shc_20260630xexhibitx10x2.htm](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx10x2.htm)

Exhibit 10.2

May 1, 2026

Mr. Alton E. Shader

Dear Alton,

Congratulations on the opportunity to join Sotera Health Company (the “Company”) as its Chief Executive Officer. This letter will recap the key elements of our offer.

- Start Date: Your employment will commence on May 26, 2026, or such other date as mutually agreed by the parties (the “Start Date”).
- Location: Your primary place of employment will be the Sotera Health Corporate Headquarters in Broadview Heights, Ohio and accordingly, you will be expected to commute to Corporate Headquarters on a regular basis.
- Reporting: You will report to the Board of Directors (the “Board”) and work closely with Michael Petras, who will assume the role of Executive Chairman of the Board.
- Board of Directors: In connection with your appointment as Chief Executive Officer, the Board shall appoint you as a member of the Board effective as of the Start Date. Following your appointment to the Board and during your employment as Chief Executive Officer, the Company shall also nominate you for re-election as a member of the Board at the expiration of each term of office, subject to your continued employment as Chief Executive Officer.
- Status & Salary: You will be employed as a full-time, exempt, salaried employee. Your starting salary will be $1,000,000 annually, payable on a bi-weekly basis. The Company may review and/or revise your salary from time to time, in its sole discretion.
- Annual Incentive Plan: You will participate in the Annual Incentive Plan (AIP), on the terms and conditions set forth therein, at a target of 110% of your base annual salary (“Annual AIP Target”). For 2026, your participation in the AIP will not be prorated based on your hire date.
- Sign-on Equity: Within thirty (30) days after your start date, the Company will grant to you a sign-on equity award with a grant date fair value of $6,000,000 comprised of restricted stock units (RSUs) to replace the long-term incentives you will forfeit with your former employer (“Sign-On Award”). This Sign-On Award will have a vesting commencement date of March 2, 2026 and will vest one-third per year over three years subject to continued employment through each applicable vesting date. Should the Company or Board terminate your employment without Cause (as defined below), any unvested RSUs remaining from the Sign-On Award that would have vested during the 2-year period immediately following the date of such termination shall immediately vest as of the termination date.
- Annual Long-Term Incentive Plan: You will receive an initial annual equity award with a target grant date fair value of $6,500,000 and a vesting commencement date of March 2, 2026, subject to the approval of the Leadership Development and Compensation Committee of the Company’s Board of Directors and the Board of Directors (“Initial Equity Award”). This Initial Equity Award will be comprised of 50% RSUs and 50% performance share units (PSUs). The RSUs related to this Initial Equity Award vest one-third per year over three years and the PSUs will be eligible to vest 100% after the three-year performance period based on performance against pre-established free cash flow and revenue goals, in each case, subject to continued employment through each applicable vesting dates.

You will also receive an initial award of Share Appreciation Units (SAUs) with a maximum grant date fair value of $1,625,000 and a vesting commencement date of March 2, 2026 (“Initial SAU Award”). The SAUs related to the Initial SAU Award will vest one-third per year if the Company’s annualized stock price appreciation targets (which, consistent with SAU grants in 2026 to other senior executives of the Company, shall be measured based on a “Grant Date Price” as if the grant date of such SAU was March 2, 2026) are met, subject to continued employment through each applicable vesting date.

Starting in 2027 and subject to your continued employment, you will receive annual long-term equity incentive awards with an aggregate grant date fair value of at least $6,500,000 (“Annual LTI Target”), which may be in the form of RSUs, PSUs, SAUs or other equity-based award types, as determined by the Board. Your equity awards will be subject to and contingent upon your acceptance of, the terms and conditions of the Sotera Health Company 2020 Omnibus Incentive Plan, as well as any applicable grant notices and agreements associated with your awards. Additional information will be provided upon acceptance of this offer.

- Benefits Program: You are eligible to participate in the Company’s benefits program, including but not limited to medical, dental, vision and 401(k) plan with company match. All plans are in accordance with the terms and conditions of that program and associated insurance policies, as may be in effect from time to time. The Company reserves the right to amend or discontinue its benefits program at any time, with or without advance notice.
- Vacation: You are entitled to four (4) weeks of vacation annually, subject to the terms and conditions of the Company’s vacation policy as may be in effect from time to time. Your vacation time will be prorated during your first year of employment, according to your hire date.
- Termination of Employment: In the event your employment is terminated by the Company without Cause or by you for Good Reason (defined below), the Company will provide you with separation pay as follows: (i) salary continuation equal to eighteen (18) months of your then current base salary (prior to any unauthorized salary reduction that may have triggered “Good Reason), (ii) payment of your full AIP at target for the year in which the separation occurs, and (iii) if you elect COBRA continuation coverage, reimbursement on a monthly basis for a portion of the COBRA premiums paid for by you for yourself and your eligible dependents at the same rate as the Company pays for health insurance coverage for its active employees (with you paying for the employee paid portion of such coverage) for eighteen (18) months following your termination of employment (“COBRA Amount”); provided, however, that if you become re-employed with another employer, you will be obligated to provide the Company with written notice of such new employment within five (5) business days of obtaining such new employment and the reimbursement by the Company of the COBRA Amount will cease (hereafter the “Separation Payments”). Payment of the Separation Payments is subject to the following: (A) such Separation Payments shall be made in accordance with the Company’s normal payroll practices (other than the COBRA Amount) and shall commence on the sixtieth (60th) day following the date of your termination of employment (the “Release Date”) subject to your execution and delivery to the Company of a general release in a form acceptable to the Company (and such release being in full force and effect and having not been timely revoked in accordance with its terms) (the “Release Requirement”) and (B) you shall be entitled to receive such Separation Payments only so long as you have not breached any of the provisions of such general release or any restrictive covenants to which you are subject. If the Release Requirement is satisfied, then the portion of the Separation Payments which would otherwise have been paid during the period between the date of termination of employment and the Release Date shall instead be paid as soon as reasonably practicable following the Release Date. If the Release Requirement is not satisfied as of the Release Date, you shall not be entitled to any Separation Payments and the Company shall have no further obligations in connection with the Separation Payments.

For purposes hereof, “Cause” shall have the same meaning as ascribed to such term in the Sotera Health Company 2020 Omnibus Incentive Plan. For the purposes hereof, “Good Reason” shall not include your death or disability but shall mean any of the following occurrences without your written consent: (i) material diminution in your duties, responsibilities or authority or assignment to you of any duties inconsistent in any material respect with your position as CEO; (ii) any reduction by the Company in your base salary, Annual AIP Target or your Annual LTI Target, in each case, as set forth herein, unless such reduction is a part of an across-the-board proportional decrease in base salaries, annual AIP targets and/or annual LTI targets affecting all Company senior executives, which reduction is approved by the Board; (iii) you are required to relocate to any location that is more than fifty (50) miles away from your residence in Lake Forest, Illinois (it being agreed and understood that the requirement that you continue to regularly commute to Broadview Heights, Ohio (as described herein) shall not constitute grounds for Good Reason hereunder); or (iv) a material breach by the Company of any provision of this offer agreement; provided that, in each case, (A) within ninety (90) days of the initial occurrence of the specified event you have given the Company written notice giving the Company at least thirty (30) days to cure the Good Reason event, (B) the Company has not cured the Good Reason event within the thirty-day (30) day cure period, and (C) you resign immediately, and in no event later than thirty (30) days, following the expiration of such thirty-day (30) cure period.

Notwithstanding any provision of this letter to the contrary, in the event that you are a “specified employee” within the meaning of Code Section 409A (as defined below), any payments or benefits that are considered non-qualified deferred compensation under Code Section 409A payable under this section on account of a “separation from service” during the six-month period immediately following the termination date shall, to the extent necessary to comply with Code Section 409A, instead be paid, or provided, as the case may be, on the first business day after the date that is six months following your

“separation from service” within the meaning of Code Section 409A. For purposes of Code Section 409A, your right to receive any installment payments pursuant to this section shall be treated as a right to receive a series of separate and distinct payments. In no event may you, directly or indirectly, designate the calendar year of any payment to be made under this section that is considered nonqualified deferred compensation, subject to Code Section 409A.

- Commuting Bonus: We will provide you an annual commuting bonus of $100,000 to cover reasonable travel expenses to the corporate headquarters.
- Stock Ownership Guidelines: You will be subject to stock ownership guidelines equal to five-times your annual base salary. You will have five years to attain such amount.

Your employment with the Company is “at will”; it is for no specified term and may be terminated by you or the Company at any time, with or without cause or advance notice. This letter may be executed in counterparts and shall be binding upon the parties upon execution and may only be amended in writing signed by each of the parties hereto. The Company reserves the right to add, delete, or modify all plans, program, policies, procedures, and guidelines at any time, provided, however, that such actions shall not modify the compensation and benefits specifically provided to you under this letter. This letter constitutes the complete agreement between you and the Company with respect to the subject matter hereof, and supersedes any prior understandings or agreements with respect thereto, and shall be governed by the internal substantive laws of the state of Delaware. All compensation and benefits described herein will be subject to applicable tax withholding.

The intent of the parties is that payments and benefits under this letter comply with or be exempt from Section 409A of the Internal Revenue Code of 1986, as amended (the “Code”) and the regulations and guidance promulgated thereunder (collectively “Code Section 409A”) and, accordingly, to the maximum extent permitted, this letter shall be interpreted to be exempt from or in compliance therewith. In no event whatsoever shall the Company be liable for any additional tax, interest or penalty that may be imposed on you by Code Section 409A or damages for failing to comply with Code Section 409A.

This offer is contingent upon favorable references and successful completion of background and drug screens.

As a condition of your employment, you will be required to provide the Company with documents establishing your identity and right to work in the United States. These documents must be provided to the Company within three days after your employment start date. In addition, you will also be required to sign a restrictive covenants agreement in a form customary for senior executives covering non-competition and non-solicitation (while employed and for 18 months postemployment) and confidentiality.

Alton, we look forward to you joining the Company and becoming part of our team. We are sure you will find your career with us both challenging and rewarding. To confirm your acceptance of this offer of employment on the terms and conditions set out above, please sign below and return to me.

Sincerely,

/s/ Michael B. Petras, Jr.

Michael B. Petras, Jr.

Chairman and Chief Executive Officer Sotera Health Company

By my signature below, I confirm that I have read, understand and agree with the terms of this offer.

Alton E. Shader /s/ Alton E. Shader / May 2, 2026

Alton E. Shader (please print) Signature/Date

---

## EX-10.3

SEC source: [shc_20260630xexhibitx10x3.htm](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx10x3.htm)

Exhibit 10.3

Amendment to Amended and Restated Senior Management Agreement

This Amendment to Amended and Restated Senior Management Agreement (the “Amendment”) is entered into by and between Sotera Health Company, a Delaware corporation (the “Company”), and Michael B. Petras, Jr. (the “Executive”) as of April 30, 2026. Capitalized terms used but not otherwise defined herein are defined in the Original Agreement.

WHEREAS, the Company and Executive are parties to an Amended and Restated Senior Management Agreement dated as of November 10, 2020 (the “Original Agreement”), providing for the terms of Executive’s employment by the Company as its Chief Executive Officer; and

WHEREAS, in connection with Executive’s transition to the role of Executive Chairman, the Company and Executive have agreed to amend the Original Agreement as set forth herein.

NOW, THEREFORE, in consideration of the mutual covenants contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties to this Amendment hereby agree as follows:

Section 1. Amendment to Section 1. The first sentence of Section 1 of the Original Agreement is hereby amended and restated as follows:

“Effective as of May 26, 2026 or such other date as mutually agreed by the parties (the “Effective Date”), the Company agrees to employ Executive as Executive Chairman, and Executive accepts such employment, for the period beginning on the Effective Date and ending upon his Separation pursuant to Section 1(c) hereof (the “Employment Period”).”

Section 2. Amendment to Sections 1(a)(i) and (ii). Sections 1(a)(i) and (ii) of the Original Agreement are hereby amended and restated as follows:

“(i) During the Employment Period, Executive shall serve as Executive Chairman of the Company and shall have the normal duties, responsibilities and authority implied by such position, including, without limitation, supporting the transition of the responsibilities of the Chief Executive Officer role and the Company’s strategic priorities, the responsibilities associated with the Executive Chairman of the Company and such other activities as are reasonably directed by the Board, subject in each case to the power of the Board to expand such duties, responsibilities, positions and authority and to otherwise override actions of officers.

(ii) Executive in his capacity as Executive Chairman shall report to the Board, and Executive shall devote his best efforts and his full business time and attention to the business and affairs of the Company and its Subsidiaries. Executive will not engage in any other business, profession or occupation for compensation or otherwise which would conflict or interfere with the performance of his duties and responsibilities either directly or indirectly without the prior written consent of the Board.”

Section 3. Amendment to Section 1(b)(i). As of the Effective Date, the defined term “Annual Base Salary” shall be redefined as “$900,000 per annum.”

Section 4. Amendment to Section 1(b)(ii). The second and third sentences of Section 1(b)(ii) of the Original Agreement are hereby amended and restated as follows:

“As of the Effective Date, the target Annual Bonus will be 110% of the Annual Base Salary (the “Annual Bonus Opportunity”). The maximum Annual Bonus will be 220% of the Annual Base Salary.”

Section 5. Amendment to Section 1(b)(iii). Section 1(b)(iii) of the Original Agreement is hereby amended and restated as follows:

“Beginning in 2027, Executive will receive an annual equity award with a target grant date fair value of $5,000,000. The annual grant shall be made when other Company annual grants are made, typically in March of each year. Executive’s equity awards will be subject to and contingent upon his acceptance of, the terms and conditions of the Company Equity Incentive Plan, as well as any applicable grant notices and agreements associated with his awards. Company equity awards granted to Executive following the Effective Date (the “Covered Equity Awards”) shall provide the following terms and conditions: (A) subject to the Executive’s satisfaction of the Release Requirement (as defined below), full vesting upon a termination by the Company without Cause or by Executive with Good Reason; (B) full vesting upon Executive’s Retirement (excluding awards that were granted within six (6) months before such Retirement) or upon Executive’s death or Disability; and (C) full vesting upon a Change in Control (as defined in the Company Equity Incentive Plan) where the acquiror does not assume or substitute the outstanding unvested Covered Equity Awards. The type and vesting schedule of any future equity awards granted to Executive shall be determined by the Board or the Committee in its discretion; provided, however, that the applicable award agreements evidencing such equity awards shall provide time-based vesting protections that are no less favorable to Executive than those set forth in the foregoing clauses (A), (B) and (C) of this Section 1(b)(iii); provided, further, that to the extent any such equity award is subject to any performance or performance-based vesting conditions, as determined in the discretion of the Board or the Committee, if the vesting protections set forth in the foregoing clauses (A), (B) or (C) of this Section 1(b)(iii) are triggered, any performance or performance-based vesting component of such award shall be deemed satisfied at the target level of performance, excluding any units for which the performance condition is a specified increase in share price (including any “share appreciation unit” grants), for which performance shall be determined on the basis of the relative achievement of the applicable performance goals in accordance with the terms of the applicable grant notice and agreement (the “Vesting Protections”). For the avoidance of doubt, no Covered Equity Award that constitutes non-qualified deferred compensation for purposes of Code Section 409A shall vest in accordance with the foregoing clauses (A) or (B) until Executive experiences a termination in his Continuous Service Status (as defined in the Company Equity Incentive Plan) that qualifies as a “separation from service” as defined under Code Section 409A. All Covered Equity Awards that constitute non-qualified

deferred compensation for purposes of Code Section 409A will be subject to a six-month settlement delay in accordance with Section 19 of the Company Equity Incentive Plan.”

Section 6. Amendment to Section 3(c). The last sentence of Section 3(c) of the Original Agreement is hereby amended and restated as follows:

“Nothing in this Section 3(c) shall be construed to limit the ability of any Person to disclose information and documents, or give truthful testimony, pursuant to a subpoena, court order or a government investigative matter or to provide, during the Employment Period truthful statements necessary to the performance of Executive’s duties as Executive Chairman, subject to and as provided in Section 2.”

Section 7. Amendment to Good Reason Definition. The definition of “Good Reason” contained in Section 4 of the Original Agreement is hereby amended and restated as follows:

““Good Reason” means without Executive’s prior written consent (i) any material reduction in Executive’s title, status or authority, including the failure to elect Executive to serve as the Executive Chairman of the Board (it being understood that the Board’s election of a Lead Independent Director shall not be grounds for Good Reason, provided that Executive continues to serve as Executive Chairman), (ii) any material reduction of Executive’s responsibilities or assignment of duties inconsistent with the position of Executive Chairman, (iii) any material reduction of (1) Executive’s Annual Base Salary or Annual Bonus Opportunity, (2) Executive’s other compensation or (3) the aggregate value of Executive’s benefits or (iv) failure of the Board or the Committee to provide the Vesting Protections in respect of any Covered Equity Awards; provided that, in order for an event to constitute Good Reason for any purpose hereunder, Executive must, within 30 days after the date Executive learned or could reasonably have been expected to have learned of the occurrence of such event, provide the Board with written notice of his objection to such event, and, even if such notice is timely delivered, such event shall not constitute Good Reason for any purpose hereunder if substantially all detriment otherwise resulting to Executive from such action can be cured by appropriate action which the Company causes to be taken within 30 days following the Board’s receipt of Executive’s written notice (such period, the “Cure Period”); provided, further, in order for an event to constitute Good Reason for any purpose hereunder, Executive must, within 30 days after expiration of the Cure Period, deliver a written notice to the Company of his resignation, which resignation shall be effective on the date immediately following the Company’s receipt of such notice (or on such other day mutually agreed upon by the Company and Executive).”

Section 8. Amendment to Retirement Definition. The definition of “Retirement” contained in Section 4 of the Original Agreement, and in Company equity awards issued in 2024, is hereby amended and restated as follows:

““Retirement” means termination of Participant’s Continuous Service Status (as defined in the Company Equity Incentive Plan) after the date on which the sum of Participant’s age and years of Continuous Service Status with the Company is equal to or greater than 65.”

Section 9. This Amendment shall be deemed to be an amendment of the Original Agreement in accordance with Section 6(k) of the Original Agreement. Except as specifically modified herein, the Original Agreement shall remain in full force and effect.

Section 10. This Amendment may be executed in separate counterparts (including by means of facsimile), each of which is deemed to be an original and all of which taken together constitute one and the same agreement.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the date first above written.

SOTERA HEALTH COMPANY

By: /s/ Vincent K. Petrella

Name: Vincent K. Petrella

Title: Lead Independent Director

EXECUTIVE

By: /s/ Michael B. Petras, Jr.

Name: Michael B. Petras, Jr.

[Signature Page to Amendment]

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## EX-31.1

SEC source: [shc_20260630xexhibitx31x1.htm](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx31x1.htm)

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Alton E. Shader, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Sotera Health Company;

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; and

(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/ Alton E. Shader

Alton E. Shader

Chief Executive Officer

(Principal Executive Officer)

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## EX-31.2

SEC source: [shc_20260630xexhibitx31x2.htm](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx31x2.htm)

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Jonathan M. Lyons, certify that:

1.I have reviewed this quarterly report on Form 10-Q of Sotera Health Company;

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; and

(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/ Jonathan M. Lyons

Jonathan M. Lyons

Senior Vice President and Chief Financial Officer

(Principal Financial Officer)

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## EX-32.1

SEC source: [shc_20260630xexhibitx32x1.htm](https://www.sec.gov/Archives/edgar/data/1822479/000182247926000047/shc_20260630xexhibitx32x1.htm)

Exhibit 32.1

CERTIFICATIONS OF PRINCIPAL EXECUTIVE OFFICER AND PRINCIPAL FINANCIAL OFFICER

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), each of the undersigned officers of Sotera Health Company (the “Company”), do hereby certify, to each such officer’s knowledge, that the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2026 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and information contained in the Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Alton E. Shader

Dated: August 6, 2026 Alton E. Shader   Title: Chief Executive Officer   (Principal Executive Officer)

/s/ Jonathan M. Lyons

Dated: August 6, 2026 Jonathan M. Lyons   Title: Senior Vice President and Chief Financial Officer   (Principal Financial Officer)

The foregoing certifications are furnished and are not deemed filed with the Securities and Exchange Commission for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and are not deemed to be incorporated by reference into any filing of Sotera Health Company under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent that Sotera Health Company specifically incorporates them by reference.