Sotera Health Co

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 is 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 14, “Commitments and Contingencies”, of Our Consolidated Financial Statements

Note 14, “Commitments and Contingencies” to our consolidated financial statements for the three and nine months ended September 30, 2025 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 14, “Commitments and Contingencies” for information regarding the following legal proceedings, which information is incorporated into this item by reference:

•Ethylene Oxide Tort Litigation – California, Georgia, Illinois and New Mexico;

•Insurance Coverage for Environmental Liabilities; and

•Sotera Health Company Securities Litigation and Related Matters.

Legal Proceedings Not Described in Note 14, “Commitments and Contingencies” to Our Consolidated Financial Statements

In addition to the matters that are identified in Note 14, “Commitments and Contingencies” to our consolidated financial statements for the three and nine months ended September 30, 2025 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.