Director — James C. Neary: A Class I director resigned effective shortly after notification with no stated disagreement, representing a standard board turnover event rather than an executive crisis.

Results of Operations and Financial Condition. On August 6, 2026, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended June 30, 2026. The Company will hold its previously announced conference call on August 6, 2026, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by…

Entry into a Material Definitive Agreement. Credit Agreement On May 20, 2026, Sotera Health Company (the “Company”), Sotera Health Holdings, LLC (“SHH”), certain subsidiaries of the Company, each 2026 Refinancing Term Lender (the “Refinancing Lenders”) and JPMorgan Chase Bank, N.A., as first lien Administrative Agent (the “Administrative Agent”) entered into Amendment No. 7 (the “Amendment”) to the First Lien Credit Agreement dated as of December 13, 2019, by and among the Company, SHH, the A…

Creation of a Direct Financial Obligation or an obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth under

Termination of a Material Definitive Agreement On May 13, 2026, the stockholders’ agreement (the “Stockholders Agreement”) by and among Sotera Health Company (the “Company”) and the stockholders party thereto, dated as of November 19, 2020, terminated pursuant to its terms as described below under

CEO — Alton Shader: Alton Shader was appointed as the new CEO, while Michael B. Petras Jr. transitioned to Executive Chairman.

Results of Operations and Financial Condition. On May 5, 2026, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended March 31, 2026. The Company will hold its previously announced conference call on May 5, 2026, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by refe…

Class I director — Constantine S. Mihas: Mr. Mihas resigned as a Class I director due to a reduction in the number of directors that certain stockholders are entitled to designate, and Kenneth D. Krause was appointed as his successor.

Results of Operations and Financial Condition. On February 24, 2026, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter and year ended December 31, 2025. The Company will hold its previously announced conference call on February 24, 2026, at 9:00 a.m. Eastern Time to discuss its financial results and full-year 2026 outlook. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1…

Senior Vice President and General Counsel — Alex Dimitrief: Alex Dimitrief is retiring but will be retained as an advisor, and Erika Ostrowski will take over his role.

Class III director — Richard G. Kyle: The company expanded its board and appointed a highly experienced executive as a new director.

and Item 7.01, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to liability under that section, and shall not be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, unless expressly incorporated by specific reference in such filing.

Results of Operations and Financial Condition. On November 4, 2025, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended September 30, 2025. The Company will hold its previously announced conference call on November 4, 2025, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated…

Entry into a Material Definitive Agreement. Credit Agreement On September 17, 2025, Sotera Health Company (the “Company”), Sotera Health Holdings, LLC (“SHH”), certain subsidiaries of the Company, each 2025 Refinancing Term Lender (the “Refinancing Lenders”) and JPMorgan Chase Bank, N.A., as first lien Administrative Agent (the “Administrative Agent”), entered into Amendment No. 6 (the “Amendment”) to the First Lien Credit Agreement dated as of December 13, 2019, by and among the Company, SHH…

Creation of a Direct Financial Obligation or an obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth under

Results of Operations and Financial Condition. On August 8, 2025, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended June 30, 2025. The Company will hold its previously announced conference call on August 8, 2025, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by…

Results of Operations and Financial Condition. On May 1, 2025, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended March 31, 2025. The Company will hold its previously announced conference call on May 1, 2025, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is incorporated herein by refe…

Results of Operations and Financial Condition. On February 27, 2025, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter and year ended December 31, 2024. The Company will hold its previously announced conference call on February 27, 2025, at 9:00 a.m. Eastern Time to discuss its financial results and full-year 2025 outlook. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1…

and Item 7.01, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to liability under that section, and shall not be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, unless expressly incorporated by specific reference in such filing.

Results of Operations and Financial Condition. On November 5, 2024, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended September 30, 2024. The Company will hold its previously announced conference call on November 5, 2024, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter ended September 30, 2024. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit…

Director — David A. Donnini: The resignation is a direct consequence of a contractual reduction in board seats following a stock sale, not a sudden executive departure or disagreement.

Results of Operations and Financial Condition. On August 5, 2024, Sotera Health Company (the “Company”) issued a press release (the “Press Release”) announcing its financial results for the quarter ended June 30, 2024. The Company will hold its previously announced conference call on August 5, 2024, at 9:00 a.m. Eastern Time to discuss its financial results for the quarter ended June 30, 2024. A copy of the Press Release is attached to this Current Report on Form 8-K as Exhibit 99.1 and is in…

Director — Christopher A. Simon: The filing discloses the appointment of a new independent director to the board, which is a routine governance event and not a departure of a senior executive.

Other Events. On May 23, 2024, SHH, the Company and the Guarantors entered into a purchase agreement with J.P. Morgan Securities LLC, as representative of the several initial purchasers listed in Schedule I to such purchase agreement, relating to the Notes offering.

Creation of a Direct Financial Obligation or an obligation under an Off-Balance Sheet Arrangement of a Registrant. The disclosure set forth under