[Form 4] Sotera Health Co Insider Trading Activity

Rhea-AI Filing Summary

Sotera Health Co (SHC) insiders affiliated with Warburg Pincus reported a sale of 18,000,000 shares of common stock in an underwritten public secondary offering on November 10, 2025 at $15.651 per share.

After the reported transaction, the reporting group indicated 43,822,952 shares beneficially owned on an indirect basis, as referenced in the footnotes. The filing identifies the reporting persons as both Director and 10% Owner and notes that the report was filed by more than one reporting person.

Insights

Securities law analyst

Large insider secondary sale; administrative disclosure, not operational.

The filing records a selling stockholder transaction by Warburg Pincus–affiliated entities: 18,000,000 shares sold at $15.651 per share via an underwritten public secondary offering on November 10, 2025. This reflects a change in ownership, not an issuance by Sotera Health.

Form 4 disclosures focus on insider holdings and trades. The group remains a significant holder, noting 43,822,952 shares beneficially owned on an indirect basis after the transaction. Actual market impact depends on buyer distribution and broader trading conditions.

The administrative nature of a secondary sale means business operations and cash flows for the issuer are not addressed here. Subsequent filings may detail any further ownership changes by the selling holders.

Insider Trade Summary

Net Seller: 18,000,000 shares ($281,718,000)

Net Sell 1 txn

Insider WARBURG PINCUS & CO., 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.

Role Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director, 10% Owner | Director

Sold 18,000,000 shs ($281.72M)

Type	Security	Shares	Price	Value
Sale	Common Stock, $0.01 par value per share ("Common Stock")	18,000,000	$15.651	$281.72M

Holdings After Transaction: Common Stock, $0.01 par value per share ("Common Stock") — 43,822,952 shares (Indirect, See Footnote)

Footnotes (1)

1. On November 10, 2025, certain of the Warburg Pincus Entities (as defined below) sold a total of 18,000,000 shares of Common Stock of Sotera Health Company (the "Issuer") in an underwritten public secondary offering (the "Offering"). Following the Offering, consists of (i) 14,405,046 shares of Common Stock of the Issuer held by Bull Holdco L.P. ("Bull Holdco") and (ii) 3,594,954 shares of Common Stock of the Issuer held by Bull Co-Invest L.P., a Delaware limited partnership ("Bull Co-Invest"). 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"). 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." 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. 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.

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Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

WARBURG PINCUS & CO.

(Last) (First) (Middle)

450 LEXINGTON AVENUE

NEW YORK

(Street)

NY NY 10017

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Sotera Health Co [ SHC ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
11/10/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock, $0.01 par value per share ("Common Stock")	11/10/2025		S		18,000,000(1)	D	$15.651	43,822,952(2)	I	See Footnote(3)(4)(5)(6)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

WARBURG PINCUS & CO.

(Last) (First) (Middle)

450 LEXINGTON AVENUE

NEW YORK

(Street)

NY NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Warburg Pincus Private Equity XI, L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

450 LEXINGTON AVENUE NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

WP XI Partners, L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

450 LEXINGTON AVENUE NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Warburg Pincus XI Partners, L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Warburg Pincus Private Equity XI-B, L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

450 LEXINGTON AVENUE NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Bull Co-Invest L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Bull Holdco L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Warburg Pincus XI, L.P.

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

450 LEXINGTON AVENUE NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

WP Global LLC

(Last) (First) (Middle)

C/O WARBURG PINCUS LLC

450 LEXINGTON AVENUE

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Warburg Pincus Partners II, L.P.

(Last) (First) (Middle)

450 LEXINGTON AVENUE

C/O WARBURG PINCUS LLC

(Street)

NEW YORK NY 10017

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. On November 10, 2025, certain of the Warburg Pincus Entities (as defined below) sold a total of 18,000,000 shares of Common Stock of Sotera Health Company (the "Issuer") in an underwritten public secondary offering (the "Offering").

2. Following the Offering, consists of (i) 14,405,046 shares of Common Stock of the Issuer held by Bull Holdco L.P. ("Bull Holdco") and (ii) 3,594,954 shares of Common Stock of the Issuer held by Bull Co-Invest L.P., a Delaware limited partnership ("Bull Co-Invest").

3. 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").

4. 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."

5. 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.

6. 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.

Remarks:

Form 1 of 2. Two reports are filed that relate to the same transactions. See Form 2 of 2 for additional reporting entities.

	See Exhibit 99.1	11/12/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.