X0202 SCHEDULE 13G 0001582090 XXXXXXXX LIVE Common Stock, par value $0.01 per share 05/11/2026 0001822479 Sotera Health Co 83601L102 9100 South Hills Blvd Suite 300 Broadview Heights OH 44147 Rule 13d-1(c) Sachem Head Capital Management LP a DE 0.00 15560000.00 0.00 15560000.00 15560000.00 N 5.46 IA The percentages used herein are calculated based upon 285,166,994 shares of Common Stock outstanding (as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 5, 2026). Uncas GP LLC a DE 0.00 15560000.00 0.00 15560000.00 15560000.00 N 5.46 OO The percentages used herein are calculated based upon 285,166,994 shares of Common Stock outstanding (as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 5, 2026). Sachem Head GP LLC a DE 0.00 11450000.00 0.00 11450000.00 11450000.00 N 4.02 OO The percentages used herein are calculated based upon 285,166,994 shares of Common Stock outstanding (as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 5, 2026). Ferguson Scott D. a X1 0.00 15560000.00 0.00 15560000.00 15560000.00 N 5.46 IN The percentages used herein are calculated based upon 285,166,994 shares of Common Stock outstanding (as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 5, 2026). Sotera Health Co 9100 South Hills Blvd, Suite 300, Broadview Heights, OH 44147 This statement is filed by: (i) Sachem Head Capital Management LP, a Delaware limited partnership ("Sachem Head"); (ii) Uncas GP LLC, a Delaware limited liability company ("SH Management"); (iii) Sachem Head GP LLC, a Delaware limited liability company ("Sachem Head GP"); and (iv) Scott D. Ferguson, a citizen of the United States of America ("Mr. Ferguson"). The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Sachem Head serves as investment advisor to certain affiliated funds, including Sachem Head LP, a Delaware limited partnership ("SH"), Sachem Head Master LP, an exempted limited partnership organized under the laws of the Cayman Islands ("SHM"), and SH Stony Creek Master Ltd., an exempted company incorporated under the laws of the Cayman Islands ("Stony Creek"), and as such may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) all of the shares of Common Stock (as defined in Item 2(d) below) held by SH, SHM, and Stony Creek. SH Management serves as the sole general partner of Sachem Head, and as such may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) all of the shares of Common Stock reported herein. Sachem Head GP serves as the general partner of certain affiliated funds, including SH and SHM, and as such may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) all of the shares of Common Stock held by SH and SHM. Mr. Ferguson serves as the managing partner of Sachem Head and the managing member of SH Management and Sachem Head GP, and as such may be deemed to have the shared power to vote or direct the vote of (and the shared power to dispose or direct the disposition of) all of the shares of Common Stock reported herein. The filing of this statement should not be construed as an admission that any of the Reporting Persons is, for the purposes of Section 13 of the Act, the beneficial owner of the Common Stock reported herein. The address of the business office of each of the Reporting Persons is 250 West 55th Street, 34th Floor, New York, New York 10019. Sachem Head is a Delaware limited partnership. Each of SH Management and Sachem Head GP is a Delaware limited liability company. Mr. Ferguson is a citizen of the United States. Y The information required by Items 4(a) - (c) is set forth in Rows (5) - (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. The percentages used herein are calculated based upon 285,166,994 shares of Common Stock outstanding (as reported in the Issuer's Quarterly Report on Form 10-Q, filed with the Securities and Exchange Commission on May 5, 2026). See response to Item 11 on the cover page for each Reporting Person See response to Item 5 on the cover page for each Reporting Person See response to Item 6 on the cover page for each Reporting Person See response to Item 7 on the cover page for each Reporting Person See response to Item 8 on the cover page for each Reporting Person Y N See Item 2. Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. EXHIBIT 1 JOINT ACQUISITION STATEMENT PURSUANT TO RULE 13d-1(k) The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint acquisition statements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate. DATED: May 15, 2026 SACHEM HEAD CAPITAL MANAGEMENT LP By: Uncas GP LLC, its General Partner By: /s/ Scott D. Ferguson Scott D. Ferguson Managing Member UNCAS GP LLC By: /s/ Scott D. Ferguson Scott D. Ferguson Managing Member SACHEM HEAD GP LLC By: /s/ Scott D. Ferguson Scott D. Ferguson Managing Member /s/ Scott D. Ferguson Scott D. Ferguson Sachem Head Capital Management LP /s/ Scott D. Ferguson 05/15/2026 Uncas GP LLC /s/ Scott D. Ferguson 05/15/2026 Sachem Head GP LLC /s/ Scott D. Ferguson 05/15/2026 Ferguson Scott D. /s/ Scott D. Ferguson 05/15/2026