X0306 4 2020-11-20 0 0001822479 Sotera Health Co SHC 0001832387 Petras Michael B. Jr. C/O SOTERA HEALTH COMPANY 9100 SOUTH HILLS BLVD, SUITE 300 BROADVIEW HEIGHTS OH 44147 1 1 0 0 Chairman & CEO Common Stock, $0.01 par value per share ("Common Stock") 2020-11-20 4 A 0 260869 0.00 A 260869 D Common Stock 2020-11-24 4 D 0 437821 21.68 D 0 I By Grantor Retained Annuity Trust Common Stock 2020-11-24 4 D 0 946102 21.68 D 7194624 I By Grantor Trust Stock Options 23.00 2020-11-20 4 A 0 1118012 0.00 A 2030-11-20 Common Stock 1118012 1118012 D These securities consist of Restricted Stock Units ("RSUs") that were granted on November 20, 2020, 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. The RSUs vest in four equal installments on each of the first four anniversaries of the date of grant, subject to the Reporting Person's continued service through each such date. Reflects a company repurchase price equal to the initial public offering price per share less underwriting discounts and commissions payable thereon, as disclosed in the company's Registration Statement on Form S-1. These options were granted on November 20, 2020, pursuant to the terms of a stock option agreement under the 2020 Incentive Plan. The options vest in four equal installments on each of the first four anniversaries of the date of grant, subject to the Reporting Person's continued service through each such date. The Power of Attorney for Mr. Michael B. Petras is filed as an exhibit to the Form 3 filed on November 20, 2020, which is hereby incorporated by reference. /s/ Jessica L. M. H. Epp, Attorney-in-Fact 2020-11-24