144 0001832387 XXXXXXXX LIVE 0001822479 Sotera Health Company 001-39729 9100 South Hills Boulevard Suite 300 Broadview Heights OH 44147 440-262-1410 Michael B. Petras, Jr. Chairman, CEO Common Stock J.P. Morgan Securities LLC 270 Park Avenue, 10th Floor New York NY 10017 1144515 21619888 285374795 08/17/2026 NASDAQ Common Stock 03/02/2026 Executive Compensation Issuer N 241210 03/02/2026 N/A Common Stock 06/17/2016 Executive Compensation Issuer N 53305 06/17/2016 N/A Common Stock 05/20/2025 Transfer Michael B. Petras, Jr., who acquired the shares on June 17, 2016 N 850000 06/17/2016 N/A Y Of the shares filed today, 294,515 shares will be sold by Michael B. Petras, Jr. and 850,000 shares will be sold by the May 2025 Michael B. Petras, Jr. Grantor Retained Annuity Trust, Michael B. Petras, Jr. as Trustee.. 08/17/2026 /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Michael B. Petras, Jr.