Sec Form 4 Filing - Leffler Scott J. @ Sotera Health Co - 2022-03-02

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

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Leffler Scott J. 2. Issuer Name and Ticker or Trading Symbol Sotera Health Co [ SHC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CFO and Treasurer (Last) (First) (Middle) C/O SOTERA HEALTH COMPANY, 9100 SOUTH HILLS BLVD, SUITE 300 3. Date of Earliest Transaction (MM/DD/YY) 03/02/2022 (Street) BROADVIEW HEIGHTS, OH44147 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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") 03/02/2022 A 37,443( 1 ) A $ 0 738,649( 2 ) D

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 Stock Options $ 20.03 03/02/2022 A 95,786 ( 3 ) 03/02/2032 Common Stock 95,786 $ 0 95,786( 3 ) D Stock Options( 4 ) $ 23 ( 5 ) 11/20/2030 Common Stock 223,602 223,602 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Leffler Scott J. C/O SOTERA HEALTH COMPANY 9100 SOUTH HILLS BLVD, SUITE 300 BROADVIEW HEIGHTS, OH44147 CFO and Treasurer Signatures /s/ Jessica L. M. H. Epp, Attorney-in-Fact 03/04/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )These securities consist of Restricted Stock Units ("RSUs") that were granted on March 2, 2022, pursuant to the terms of an RSU agreement under the Sotera Health Company 2020 Omnibus Incentive Plan ("2020 Incentive Plan"). Each RSU represents the Reporting Person's right to receive one share of common stock, subject to vesting conditions. The RSUs vest in three equal installments on each of the first three anniversaries of the date of grant, subject to the Reporting Person's continued service through each such date. ( 2 )Consists of 484,707 shares of vested Common Stock, 177,369 shares of unvested Common Stock and 76,573 RSUs. 8,600 of the unvested shares of Common Stock will vest on a daily basis, pro rata through April 3, 2022. 168,769 of the unvested shares of Common Stock will vest as of the first date on which (i) certain investment funds and entities affiliated with Warburg Pincus LLC and GTCR, LLC (the "Sponsors") have received two and one-half times their invested capital in the company and (ii) the Sponsors' internal rate of return exceeds twenty percent. ( 3 )These options were granted on March 2, 2022, pursuant to the terms of a stock option agreement under the 2020 Incentive Plan. The options vest in three equal installments on each of the first three anniversaries of the date of grant, subject to the Reporting Person's continued service through each such date. ( 4 )No transaction is being reported on this line. Reported on a previously filed Form 4. ( 5 )These options were granted on November 20, 2020, pursuant to the terms of a stock option agreement under the 2020 Incentive Plan. 25% of the options vested on November 20, 2021 and the remaining unvested options vest in three equal installments on the next three anniversaries of the date of grant, subject to the Reporting Person's continued service through each such date.

Remarks: The Power of Attorney for Mr. Leffler is filed as an exhibit to the Form 3 filed on November 20, 2020, which is hereby incorporated by reference.

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).

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