Exhibit 99.1
List of Reporting Owners and Signature Page
Name of designated filer: Warburg Pincus & Co.
Other joint filers: Warburg Pincus Private Equity XI, L.P., WP XI Partners, L.P., Warburg Pincus XI Partners, L.P., Warburg Pincus Private Equity XI-B, L.P., Bull Co-Invest L.P., Bull Holdco, L.P., Warburg Pincus XI, L.P., WP Global LLC, Warburg Pincus Partners II, L.P.
Address for each joint filer is: c/o Warburg Pincus & Co., 450 Lexington Avenue, New York, New York 10017
Issuer Name and Ticker or Trading Symbol: Sotera Health Co [SHC]
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WARBURG PINCUS & CO. |
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| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
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WARBURG PINCUS PRIVATE EQUITY XI, L.P. |
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| By: | Warburg Pincus XI, L.P., its general partner | |||||||||
| By: | WP Global LLC, its general partner | |||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
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WP XI PARTNERS, L.P. | ||||||||||
| By: | Warburg Pincus XI, L.P., its general partner | |||||||||
| By: | WP Global LLC, its general partner | |||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| WARBURG PINCUS XI PARTNERS, L.P. | ||||||||||
| By: | Warburg Pincus XI, L.P., its general partner | |||||||||
| By: | WP Global LLC, its general partner | |||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| WARBURG PINCUS PRIVATE EQUITY XI-B, L.P. | ||||||||||
| By: | Warburg Pincus XI, L.P., its general partner | |||||||||
| By: | WP Global LLC, its general partner | |||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| Warburg Pincus & Co., its managing member | ||||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| BULL CO-INVEST, L.P. | ||||||||||
| By: | WP Bull Manager, LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| BULL HOLDCO, L.P. | ||||||||||
| By: | WP Bull Holdco GP LLC, its general partner | |||||||||
| By: | Warburg Pincus Private Equity XI, L.P., its sole and managing member | |||||||||
| By: | Warburg Pincus XI, L.P., its general partner | |||||||||
| By: | WP Global LLC, its general partner | |||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | By: Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| WARBURG PINCUS XI, L.P. | ||||||||||
| By: | WP Global LLC, its general partner | |||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| WP GLOBAL LLC | ||||||||||
| By: | Warburg Pincus Partners II, L.P., its managing member | |||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Partner | |||||||||
| WARBURG PINCUS PARTNERS II, L.P. | ||||||||||
| By: | Warburg Pincus Partners GP LLC, its general partner | |||||||||
| By: | Warburg Pincus & Co., its managing member | |||||||||
| By: | /s/ Harsha G. Marti | 09/09/2025 | ||||||||
| ** Signature of Reporting Person | Date | |||||||||
| Name: | Harsha G. Marti | |||||||||
| Title: | Managing Director | |||||||||