| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| WARBURG PINCUS & CO. | Director, 10%+ Owner | 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0000929408 |
| Warburg Pincus Private Equity XI-C, L.P. | Director, 10%+ Owner | C/O WARBURG PINCUS LLC, 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001550877 |
| Warburg Pincus (Cayman) XI, L.P. | Director, 10%+ Owner | C/O WARBURG PINCUS LLC, 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001554853 |
| Warburg Pincus XI-C, LLC | Director, 10%+ Owner | C/O WARBURG PINCUS LLC, 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001554852 |
| Warburg Pincus Partners II (Cayman), L.P. | Director, 10%+ Owner | 450 LEXINGTON AVENUE, C/O WARBURG PINCUS LLC, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001658820 |
| Warburg Pincus (Bermuda) Private Equity GP Ltd. | Director, 10%+ Owner | C/O WARBURG PINCUS LLC, 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001555729 |
| WARBURG PINCUS LLC | Director, 10%+ Owner | 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001162870 |
| Warburg Pincus Partners GP LLC | Director, 10%+ Owner | C/O WARBURG PINCUS LLC, 450 LEXINGTON AVENUE, NEW YORK | See Exhibit 99.1 | 2025-12-05 | 0001621224 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | SHC | Common Stock, $0.01 par value per share ("Common Stock") | Sale | -$159M | -9.72M | -22.18% | $16.33 | 34.1M | Dec 3, 2025 | See Footnote | F1, F2, F3, F4, F5, F6 |
| Id | Content |
|---|---|
| F1 | On December 3, 2025, certain of the Warburg Pincus Entities (as defined below) sold a total of 9,720,000 shares of Common Stock of Sotera Health Company (the "Issuer") pursuant to Rule 144 under the Securities Act of 1933, as amended (the "Sale"). |
| F2 | Following the Sale, consists of (i) 27,291,923 shares of Common Stock of the Issuer held by Bull Holdco L.P. ("Bull Holdco") and (ii) 6,811,029 shares of Common Stock of the Issuer held by Bull Co-Invest L.P., a Delaware limited partnership ("Bull Co-Invest"). |
| F3 | Warburg Pincus XI, L.P., a Delaware limited partnership ("WP XI GP"), is the general partner of each of (i) Warburg Pincus Private Equity XI, L.P. ("WP XI"), (ii)Warburg Pincus Private Equity XI-B, L.P. ("WP XI-B"), (iii) WP XI Partners, L.P. ("WP XI Partners") and (iv) Warburg Pincus XI Partners, L.P. ("Warburg Pincus XI Partners"). WP Global LLC ("WP Global"), is the general partner of WP XI GP. Warburg Pincus Partners II, L.P. ("WPP II"), is the managing member of WP Global.Warburg Pincus Partners GP LLC ("WPP GP LLC"), is the general partner of WPP II. Warburg Pincus & Co. ("WP"), is the managing member of WPP GP LLC. Warburg Pincus (Cayman) XI, L.P. ("WP XI Cayman GP"), is the general partner of Warburg Pincus Private Equity XI-C, L.P. ("WP XI-C" and, together with WP XI,WP XI-B, WP XI Partners and Warburg Pincus XI Partners, the "WP XI Funds"). |
| F4 | The WP XI Funds, Bull Co-Invest, Bull Holdco, WP Global, WPP II, WPP GP LLC, WP XI Cayman GP, WP XI-C LLC, WPP II Cayman, WP Bermuda GP, WP Bull Manager, WP LLC and WP are collectively referred to herein as the "Warburg Pincus Entities." |
| F5 | Each Warburg Pincus Entity disclaims beneficial ownership with respect to any shares of Common Stock of the Issuer, except to the extent of its pecuniary interest in such shares of Common Stock, if any. The WP XI Funds, Bull Co-Invest, Bull Holdco, WP Global, WPP II, WPP GP LLC, WP XI Cayman GP, WP XI-C LLC, WPP II Cayman, WP Bermuda GP, WP Bull Manager, WP LLC and WP are directors-by-deputization solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended. Information with respect to each of the Warburg Pincus Entities is given solely by such Warburg Pincus Entity, and no Warburg Pincus Entity has responsibility for the accuracy or completeness of information supplied by another Warburg Pincus Entity. |
| F6 | Warburg Pincus XI-C, LLC ("WP XI-C LLC"), is the general partner of WP XI Cayman GP. Warburg Pincus Partners II (Cayman), L.P. ("WPP II Cayman"), is the managing member of WP XI-C LLC. Warburg Pincus (Bermuda) Private Equity GP Ltd. ("WP Bermuda GP"), is the general partner of WPP II Cayman. WP Bull Manager LLC ("WP Bull Manager"), is the general partner of Bull Co-Invest. WP is managing member of WP Bull Manager. Warburg Pincus LLC, a New York limited liability company ("WP LLC"), is the manager of the WP XI Funds. The WP XI Funds share limited partnership ownership in Bull Holdco on a pro rata basis in accordance with their respective numbers of Contributed Shares. |
Form 2 of 2. Two reports are filed that relate to the same transactions. See Form 1 of 2 for additional reporting entities.