144 0001591436 XXXXXXXX LIVE 0001822479 Sotera Health Co 001-39729 9100 SOUTH HILLS BLVD SUITE 300 BROADVIEW HEIGHTS OH 44147 440-262-1410 GTCR FUND XI/C LP Owner Common Stock, $0.01 par value per share Goldman Sachs & Co. LLC

200 West Street New York NY 10282

1295747 21159548.51 4546174 12/03/2025 NASDAQ Common Stock, $0.01 par value per share 11/19/2020 Pre-IPO Organization Issuer N 15854227 11/19/2020 Securities received in connection with a series of pre-IPO transactions Y 12/03/2025 Jeffrey Wright