X0609 4 2026-05-26 0001822479 Sotera Health Co SHC 0001523442 SHADER ALTON false 9100 SOUTH HILLS SUITE 300 BROADVIEW HEIGHTS OH 44147 true true false false Chief Executive Officer false Common Stock, $0.01 par value per share ("Common Stock") 2026-05-26 4 A false 375939 0 A 375939 D Common Stock 2026-05-26 4 A false 203634 0 A 579573 D Share Appreciation Units 2026-05-26 4 A false 101817 0 A Common Stock 101817 101817 D These securities consist of RSUs that were granted on May 26, 2026, pursuant to the terms of an RSU agreement under the Sotera Health Company 2020 Incentive Plan ("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 over three years in equal increments, commencing March 2, 2027. These securities consist of RSUs that were granted on May 26, 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 over three years in equal increments, commencing March 2, 2027. These securities consist of a maximum number of performance-based share appreciation units ("SAUs") that were granted on May 26, 2026, pursuant to the terms of a SAU Agreement under the 2020 Incentive Plan. Each SAU represents the Reporting Person's right to receive one share of Common Stock subject to stock-price-related performance conditions. The SAUs generally vest annually over three years in equal installments, commencing March 2, 2027, subject to performance. The Power of Attorney for Mr. Shader is filed as an exhibit to the Form 3 filed on [May 27, 2026], which is incorporated by reference. Gregory S. Harvey, Attorney-in-Fact 2026-05-27