STOCK TITAN

WP Investors Report 103.0M Shares of Sotera Health, Signaling Voting Alignment

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
SCHEDULE 13G/A

Rhea-AI Filing Summary

Sotera Health Co Schedule 13G/A discloses that a group of Warburg Pincus-related entities (the "WP Investors") together hold an aggregate of 103,038,253 shares of Sotera Health common stock, representing 36.3% of the outstanding class based on 284,046,606 shares outstanding per the issuer's July 29, 2025 prospectus. The filing describes a Stockholders Agreement between the WP Investors, GTCR investors and other holders that coordinates voting on certain director matters. The filing also notes 41,215,301 shares publicly reported as owned by GTCR in a Form 4 filed September 9, 2025 and states that WP Investors disclaim beneficial ownership of shares owned of record by GTCR except as set forth in the agreement.

Positive

  • Material ownership disclosure: WP Investors collectively report 103,038,253 shares (36.3%) of Sotera Health common stock.
  • Transparency on basis: Percentage calculated using 284,046,606 shares outstanding per the issuer's July 29, 2025 prospectus.

Negative

  • Beneficial ownership limitations: WP Reporting Persons expressly disclaim beneficial ownership of shares owned of record by GTCR Sponsors, potentially reducing WP's unilateral control.
  • Concentrated voting arrangements: Stockholders Agreement coordinates voting with GTCR and other holders, which may limit independent shareholder influence.

Insights

TL;DR: Warburg Pincus entities report a combined 36.3% stake in Sotera Health, a materially large ownership position that could influence governance.

The filing shows the WP Investors and affiliated entities collectively control voting rights for 103,038,253 shares and have shared dispositive power over 61,822,952 shares. The ownership percentage is calculated on 284,046,606 outstanding shares from the issuer's prospectus. This concentration is material for investors because a >35% block can affect board composition and key corporate actions, especially given the Stockholders Agreement with GTCR and other holders. The filing is a standard disclosure amendment clarifying joint filing relationships and disclaimers of beneficial ownership regarding GTCR-held shares.

TL;DR: The Stockholders Agreement and concentrated WP/GTCR holdings create coordinated voting alignment with potential governance impact.

The Schedule 13G/A documents formal governance arrangements: the Stockholders Agreement obligates WP Sponsors and GTCR Sponsors to vote certain shares for director elections and contains transfer restrictions and indemnities. The filing emphasizes that WP Reporting Persons disclaim beneficial ownership of GTCR-recorded shares, yet the agreement indicates coordinated voting. For governance reviewers, the combination of contractual voting commitments and a large stake warrants attention to director nomination rights and any transfer or voting restrictions embedded in the agreement (as described in Item 4).






Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)






SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the U.S. Securities and Exchange Commission ("Commission") September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Securities Exchange Act of 1934, as amended (the "Exchange Act")) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission on September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G




Comment for Type of Reporting Person: (1) As more fully described in Item 4 of this Amendment No. 2 to Schedule 13G, the WP Investors are party to a Stockholders Agreement with the GTCR Investors and certain other holders of Common Stock of the Issuer. The WP Investors, together with the GTCR Investors, hold an aggregate total of 103,038,253 shares of Common Stock of the Issuer (approximately 36.3% of the outstanding shares of Common Stock of the Issuer), of which 41,215,301 shares of Common Stock are publicly reported as being owned by the GTCR Investors in such entities' Form 4, filed with the Commission September 9, 2025. Although the WP Reporting Persons may be deemed to beneficially own the Common Stock held as of record by the GTCR Investors as a result of the Stockholders Agreement, each WP Reporting Person expressly disclaims beneficial ownership (within the meaning of Rule 13d-3 of the Exchange Act) with respect to any shares of Common Stock other than the shares of Common Stock of the Issuer owned of record by such WP Reporting Person. The percentages herein have been determined in accordance with footnote 2 below. Capitalized terms used herein are defined in Items 2(a) or 4 below. (2) Calculated based on 284,046,606 shares of Common Stock outstanding as of July 29, 2025 as reported on the Issuer's final prospectus reported on Form 424B7, filed on September 3, 2025.


SCHEDULE 13G



WP XI Partners, L.P.
Signature:/s/ Warburg Pincus XI, L.P.
Name/Title:Warburg Pincus XI, L.P / General Partner
Date:09/09/2025
Signature:/s/ WP Global LLC
Name/Title:WP Global LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II, L.P.
Name/Title:Warburg Pincus Partners II, L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners GP LLC
Name/Title:Warburg Pincus Partners GP LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS PRIVATE EQUITY XI, L.P.
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti, Partner
Date:09/09/2025
Signature:/s/ WP Global LLC
Name/Title:WP Global LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II, L.P.
Name/Title:Warburg Pincus Partners II, L.P. / Managing Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners GP LLC
Name/Title:Warburg Pincus Partners GP LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Partner
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS XI PARTNERS, L.P.
Signature:/s/ Warburg Pincus XI, L.P.
Name/Title:Warburg Pincus XI, L.P. / General Partner
Date:09/09/2025
Signature:/s/ WP Global LLC
Name/Title:WP Global LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II, L.P.
Name/Title:Warburg Pincus Partners II, L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners GP LLC
Name/Title:Warburg Pincus Partners GP LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS PRIVATE EQUITY XI-B, L.P.
Signature:/s/ Warburg Pincus XI, L.P.
Name/Title:Warburg Pincus XI, L.P. / General Partner
Date:09/09/2025
Signature:/s/ WP Global LLC
Name/Title:WP Global LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II, L.P.
Name/Title:Warburg Pincus Partners II, L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners GP LLC
Name/Title:Warburg Pincus Partners GP LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS PRIVATE EQUITY XI-C, L.P.
Signature:/s/ Warburg Pincus (Cayman) XI, L.P.
Name/Title:Warburg Pincus (Cayman) XI, L.P. / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus XI-C, LLC
Name/Title:Warburg Pincus XI-C, LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II (Cayman), L.P.
Name/Title:Warburg Pincus Partners II (Cayman), L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus (Bermuda) Private Equity GP Ltd.
Name/Title:Warburg Pincus (Bermuda) Private Equity GP Ltd. / General Partner
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Authorised Signatory
Date:09/09/2025
BULL CO-INVEST L.P.
Signature:/s/ WP Bull Manager LLC
Name/Title:WP Bull Manager LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Memeber
Date:09/09/2025
WARBURG PINCUS XI, L.P.
Signature:/s/ WP Global LLC
Name/Title:WP Global LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II, L.P.
Name/Title:Warburg Pincus Partners II, L.P. / Manging Member
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners GP LLC.
Name/Title:Warburg Pincus Partners GP LLC. / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Manging Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WP GLOBAL LLC
Signature:/s/ Warburg Pincus Partners II, L.P.
Name/Title:Warburg Pincus Partners II, L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners GP LLC
Name/Title:Warburg Pincus Partners GP LLC / General Partners
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co / Managing Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS PARTNERS II, L.P.
Signature:/s/ Warburg Pincus Partners GP LLC
Name/Title:Warburg Pincus Partners GP LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS PARTNERS GP LLC.
Signature:/s/ Warburg Pincus & Co.
Name/Title:Warburg Pincus & Co. / Managing Member
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti
Date:09/09/2025
WARBURG PINCUS & CO.
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Partner
Date:09/09/2025
WARBURG PINCUS (CAYMAN) XI, L.P.
Signature:/s/ Warburg Pincus XI-C, LLC
Name/Title:Warburg Pincus XI-C, LLC / General Partner
Date:09/09/2025
Signature:/s/ Warburg Pincus Partners II (Cayman), L.P.
Name/Title:Warburg Pincus Partners II (Cayman), L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus (Bermuda) Private Equity GP Ltd.
Name/Title:Warburg Pincus (Bermuda) Private Equity GP Ltd. / General Partner
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Authorised Signatory
Date:09/09/2025
WARBURG PINCUS XI-C, LLC.
Signature:/s/ Warburg Pincus Partners II (Cayman), L.P.
Name/Title:Warburg Pincus Partners II (Cayman), L.P. / Managing Member
Date:09/09/2025
Signature:/s/ Warburg Pincus (Bermuda) Private Equity GP Ltd.
Name/Title:Warburg Pincus (Bermuda) Private Equity GP Ltd. / General Partner
Date:09/09/2025
Signature:/s/ / Harsha Marti
Name/Title:Harsha Marti / Authorised Signatory
Date:09/09/2025
WARBURG PINCUS PARTNERS II (CAYMAN), L.P.
Signature:/s/ Warburg Pincus (Bermuda) Private Equity GP Ltd.
Name/Title:Warburg Pincus (Bermuda) Private Equity GP Ltd. / General Partner
Date:09/09/2025
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Authorised Signatory
Date:09/09/2025
WARBURG PINCUS (BERMUDA) PRIVATE EQUITY GP LTD.
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Authorised Signatory
Date:09/09/2025
WARBURG PINCUS LLC
Signature:/s/ Harsha Marti
Name/Title:Harsha Marti / Managing Director
Date:09/09/2025
Exhibit Information

Exhibit 99.1 Agreement of Joint Filing as required by Rule 13d-1(k)(1) under the Act.* * Incorporated herein by reference to the Agreement of Joint Filing by Warburg Pincus Private Equity XI, L.P., Warburg Pincus XI Partners, L.P., Warburg Pincus Private Equity XI-B, L.P., WP XI Partners, L.P., Warburg Pincus Private Equity XI-C, L.P., Bull Co-Invest L.P., Warburg Pincus XI, L.P., WP Global LLC, Warburg Pincus Partners II, L.P., Warburg Pincus Partners GP LLC, Warburg Pincus & Co., Warburg Pincus (Cayman) XI, L.P., Warburg Pincus XI-C, LLC, Warburg Pincus Partners II (Cayman), L.P., Warburg Pincus (Bermuda) Private Equity GP LTD., and Warburg Pincus LLC ("Warburg Pincus Funds") dated as of February 14, 2022, which was previously filed with the Commission as Exhibit 99.1 to Amendment No. 1 to Schedule 13G filed by the Warburg Pincus Funds on February 14, 2022 with respect to the shares of common stock of Sotera Health Co.

FAQ

What stake does Warburg Pincus report in Sotera Health (SHC)?

The filing reports an aggregate of 103,038,253 shares, representing 36.3% of Sotera Health common stock based on 284,046,606 shares outstanding.

How was the 36.3% ownership percentage calculated for SHC?

The percentage is calculated using 284,046,606 shares outstanding as of July 29, 2025 per the issuer's final prospectus on Form 424B7.

Does Warburg Pincus claim sole beneficial ownership of all reported shares of SHC?

No. The WP Reporting Persons expressly disclaim beneficial ownership

What governance arrangements are described in the Schedule 13G/A for SHC?

The filing references a Stockholders Agreement between WP Sponsors, GTCR Funds and other holders that sets voting arrangements on director elections, transfer restrictions and indemnification terms.

Are the GTCR holdings included in WP's aggregate amount?

The filing states the WP Investors and GTCR Investors together hold 103,038,253 shares, and separately notes 41,215,301 shares publicly reported as owned by GTCR in a Form 4 filed September 9, 2025.
Sotera Health Co

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5.31B
220.60M
2.46%
89.45%
3.99%
Diagnostics & Research
Services-misc Health & Allied Services, Nec
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United States
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