X0306 4 2020-11-20 0 0001822479 Sotera Health Co SHC 0001599220 Rutz Michael P C/O SOTERA HEALTH COMPANY 9100 SOUTH HILLS BLVD, SUITE 300 BROADVIEW HEIGHTS OH 44147 0 1 0 0 President of Sterigenics Common Stock, $0.01 par value per share ("Common Stock") 2020-11-20 4 A 0 26086 0.00 A 621043 D Stock Options 23.00 2020-11-20 4 A 0 111801 0.00 A 2030-11-20 Common Stock 111801 111801 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. Consists of 26,086 RSUs and 594,957 shares of Common Stock. 16,199 of the shares of Common Stock are vested, and 578,758 of the shares of Common Stock remain subject to vesting conditions. 20% of the shares of Common Stock will vest on May 13, 2021 (the one year anniversary of the date of grant), and the remaining shares will vest on a daily basis, pro rata through May 13, 2025. See Footnote #1 for information regarding the vesting of the RSUs. 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 P. Rutz 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