# EDGAR Filing Document

**Accession Number:** 0001822479
**File Stem:** 0001193125-26-147592
**Filing Date:** 2026-4
**Character Count:** 10714
**Document Hash:** 564b9a7d5b3a168d63ceb534ce6e8653
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-147592.hdr.sgml**: 20260408

**ACCESSION NUMBER**: 0001193125-26-147592

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20260401

**FILED AS OF DATE**: 20260408

**DATE AS OF CHANGE**: 20260408

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Ostrowski Erika
- **CENTRAL INDEX KEY:** 0002125600

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39729
- **FILM NUMBER:** 26848090

**MAIL ADDRESS:**
- **STREET 1:** 9100 SOUTH HILLS BLVD., SUITE 300
- **CITY:** BROADVIEW HEIGHTS
- **STATE:** OH
- **ZIP:** 44147
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Sotera Health Co
- **CENTRAL INDEX KEY:** 0001822479
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-MISC HEALTH & ALLIED SERVICES, NEC [8090]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 473531161
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 9100 SOUTH HILLS BLVD, SUITE 300
- **CITY:** BROADVIEW HEIGHTS
- **STATE:** OH
- **ZIP:** 44147
- **BUSINESS PHONE:** 440-262-1410

**MAIL ADDRESS:**
- **STREET 1:** 9100 SOUTH HILLS BLVD, SUITE 300
- **CITY:** BROADVIEW HEIGHTS
- **STATE:** OH
- **ZIP:** 44147

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Sotera Health Topco, Inc.
- **DATE OF NAME CHANGE:** 20200824

## Exhibit 24.1

**Power of Attorney**

Know all by these presents that the undersigned hereby constitutes and appoints each of Sarah Kim, Gregory S. Harvey and Gregory J. Dziak, signing singly, the undersigned's true and lawful attorney-in-fact to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.obtain credentials (including codes or passwords) enabling the undersigned to make filings with the United States Securities and Exchange Commission (the "SEC"), including (a) preparing, executing in the undersigned's name and on the undersigned's behalf, and submitting to the SEC a Form ID (and any amendments thereto) or any other documents necessary or appropriate to obtain such credentials and legally binding the undersigned for purpose of the Form ID or such other documents; and (b) enrolling the undersigned in EDGAR Next or any successor filing system;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.act as an account administrator for the undersigned's EDGAR account, including (a) appointing, removing and replacing account administrators, technical administrators, account users, and delegated entities; (b) maintaining the security of filer's EDGAR account, including modification of access codes; (c) maintaining, modifying and certifying the accuracy of information on the undersigned's EDGAR account dashboard; and (d) taking any other actions contemplated by Rule 10 of Regulation S-T;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.execute for and on behalf of the undersigned, in the undersigned's capacity as an officer and/or director of the RPM International Inc. (the "Company"), (a) Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules thereunder, and (b) Forms 144 under the Securities Act of 1933, as amended, and the rules thereunder (collectively, the "SEC Filings");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such SEC Filings, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;5.take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution and resubstitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4 and 5 or Forms 144 with respect to the undersigned's holdings of, and transactions in, securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed effective as of March 16, 2026.

<u>/s/ Erika Ostrowski</u> 

Name: Erika Ostrowski

DOCVARIABLE ndGeneratedStamp

------

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Ostrowski Erika<br><sub>(Last) (First) (Middle)</sub><br>C/O SOTERA HEALTH COMPANY<br>9100 SOUTH HILLS BLVD, SUITE 300<br><sub>(Street)</sub><br>BROADVIEW HEIGHTS, OH 44147<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>Sotera Health Co [ SHC ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2026-04-01 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director   [ ] 10% Owner<br>[X] Officer (give title below)   [ ] Other (specify below)<br>_SVP, General Counsel and Sec._ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock, $0.01 par value per share ("Common Stock") | 57538<sup>(1)</sup> | D |  |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Stock Options | <sup>(2)</sup> | <sup>(2)</sup> | Common Stock | 20419 | $14.59 | D |  |
| Stock Options | <sup>(3)</sup> | <sup>(3)</sup> | Common Stock | 11740 | $14.59 | D |  |
| Performance RSUs | <sup>(4)</sup> | <sup>(4)</sup> | Common Stock | 4484 | $13.38 | D |  |
| Performance RSUs | <sup>(5)</sup> | <sup>(5)</sup> | Common Stock | 9892 | $17.69 | D |  |

---

### Footnotes:

(1) These securities consist of 32,180 Restricted Stock Units ("RSUs") and 25,358 shares of Common Stock.

(2) These options were granted on March 4, 2024, pursuant to the terms of a stock option agreement under the Sotera Health Company 2020 Omnibus Incentive Plan ("2020 Incentive Plan"). The options vest annually in three equal installments commencing on March 2, 2025, subject to the Reporting Person's continued service through each such date and expire 10 years after the grant date.

(3) These options were granted on March 4, 2024, pursuant to the terms of a stock option agreement under the 2020 Incentive Plan, and have vested in full. These options expire 10 years after the grant date.

(4) These securities consist of the maximum number of additional performance-based RSUs that were granted on March 3, 2025, pursuant to the terms of an RSU agreement under the 2020 Incentive Plan. Each additional RSU represents the Reporting Person's right to receive one share of Common Stock, subject to stock-price related conditions. The additional RSUs vest in equal annual installments in March 2027 and March 2028, subject to performance.

(5) These securities consist of the maximum number of additional performance-based RSUs that were granted on March 2, 2026, pursuant to the terms of an RSU agreement under the 2020 Incentive Plan. Each additional RSU represents the Reporting Person's right to receive one share of Common Stock, subject to stock-price related conditions. The additional RSUs generally vest annually in 60%, 20% and 20% installments, respectively, commencing March 2027, subject to performance.

**Remarks:**
Exhibit 24.1 - Power of Attorney

**Signature:** Gregory J. Dziak, Attorney-in-Fact  
**Date:** 2026-04-08

### Remarks:

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.**