X0508 4 2026-03-02 0001822479 Sotera Health Co SHC 0001599220 Rutz Michael P C/O SOTERA HEALTH COMPANY 9100 SOUTH HILLS BLVD, SUITE 300 BROADVIEW HEIGHTS OH 44147 false true false false President of Sterigenics false Common Stock, $0.01 par value per share ("Common Stock") 2026-03-02 4 F false 3729 15.91 D 446475 D Common Stock 2026-03-02 4 F false 4495 15.91 D 441980 D Common Stock 2026-03-02 4 M false 14573 A 456553 D Common Stock 2026-03-02 4 F false 17497 15.91 D 439056 D Common Stock 2026-03-02 4 A false 45223 0 A 484279 D Performance RSUs 2026-03-02 4 M false 14573 D Common Stock 14573 9716 D Performance RSUs 2026-03-02 4 A false 22612 0 A Common Stock 22612 22612 D These securities represent the number of shares of Common Stock withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations due upon the vesting of 9,475 Restricted Stock Units ("RSUs") granted to the Reporting Person on March 6, 2023. This award was granted pursuant to the terms of an RSU agreement under the Sotera Health Company 2020 Omnibus Incentive Plan ("2020 Incentive Plan"). Each RSU represents the Reporting Person's right to receive one share of Common Stock, subject to vesting conditions. These securities represent the number of shares of Common Stock withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations due upon the vesting of 11,423 RSUs granted to the Reporting Person on March 4, 2024. This award was granted pursuant to the terms of an RSU agreement under the 2020 Incentive Plan. Each RSU represents the Reporting Person's right to receive one share of Common Stock, subject to vesting conditions. A portion of the Reporting Person's March 3, 2025 additional performance-based RSUs vested on March 2, 2026 based upon the achievement of performance conditions. As a result, the Reporting Person received an additional 14,573 shares of Common Stock. These securities represent the number of shares of Common Stock withheld by the Issuer to satisfy the Reporting Person's tax withholding obligations due upon the vesting of 43,720 RSUs granted to the Reporting Person on March 3, 2025. This award was granted pursuant to the terms of an RSU agreement under the 2020 Incentive Plan. Each RSU represents the Reporting Person's right to recieve one share of Common Stock, subject to vesting conditions or performance, as applicable. These securities consist of RSUs that were granted on March 2, 2026, pursuant to the terms of an RSU agreement under the 2020 Incentive Plan. Each RSU represents the Reporting Person's right to receive one share of Common Stock, subject to vesting conditions. The RSUs generally vest annually in 60%, 20%, and 20% installments, respectively, commencing March 2027. These securities consist of additional performance-based RSUs that were granted on March 3, 2025, pursuant to the terms of an RSU Agreement under the 2020 Incentive Plan. Each additional RSU represented the Reporting Person's right to receive one share of Common Stock subject to stock price-related performance conditions. Regarding the additional RSUs, the Reporting Person vested in 14,573 shares of Common Stock on March 2, 2026. The remaining additional RSUs under the award vest annually in equal installments in March 2027 and March 2028, subject to performance. These securities consist of the maximum number of additional performance-based RSUs that were granted on March 2, 2026, pursuant to the terms of an RSU agreement under the 2020 Incentive Plan. Each additional RSU represents the Reporting Person's right to receive one share of Common Stock, subject to stock price-related conditions. The additional RSUs generally vest annually in 60%, 20% and 20% installments, respectfully, commencing March 2027, subject to performance. The Power of Attorney for Mr. Rutz is filed as an exhibit to the Form 3 filed on November 20, 2020, which is hereby incorporated by reference. Matthew J. Klaben, Attorney-in-Fact 2026-03-04