Initial Statement of Beneficial Ownership (Form 3)

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * Mewhorter Bryce L 2. Date of Event Requiring Statement (Month/Day/Year) 08/07/2026 3. Issuer Name and Ticker or Trading Symbol ECOLAB INC. [ECL] (Last) (First) (Middle) 1 ECOLAB PLACE 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP & Corporate Controller 5. If Amendment, Date Original Filed (Month/Day/Year) (Street) SAINT PAUL, MN 55102 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5) Common Stock 1,450.089 D Common Stock 292.826 I(1) By Ecolab Savings Plan

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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (Right to Buy)	12/04/2019(2)	12/04/2028	Common Stock	2,511	$158.515	D
Employee Stock Option (Right to Buy)	12/03/2020(2)	12/03/2029	Common Stock	2,179	$184.39	D
Employee Stock Option (Right to Buy)	12/03/2021(2)	12/03/2030	Common Stock	2,256	$221.41	D
Employee Stock Option (Right to Buy)	12/01/2022(2)	12/01/2031	Common Stock	2,510	$223.78	D
Employee Stock Option (Right to Buy)	12/07/2023(2)	12/07/2032	Common Stock	4,235	$148.495	D
Employee Stock Option (Right to Buy)	12/06/2024(2)	12/06/2033	Common Stock	2,678	$191.03	D
Employee Stock Option (Right to Buy)	12/04/2025(2)	12/04/2034	Common Stock	1,997	$247.495	D
Employee Stock Option (Right to Buy)	12/03/2026(2)	12/03/2035	Common Stock	2,300	$268.515	D
Restricted Stock Units	11/02/2026(3)	11/02/2026	Common Stock	2,948	$0	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Mewhorter Bryce L 1 ECOLAB PLACE SAINT PAUL, MN 55102			SVP & Corporate Controller

Signatures

/s/ Corinne Lawson, as Attorney-in-Fact for Bryce L. Mewhorter		08/07/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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).
(1)	Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of July 31, 2026. (The 292.826 UNITS are the equivalent of approximately 537 SHARES of the issuer's Common Stock.)
(2)	The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant.
(3)	Each restricted stock unit represents a contingent right to receive one share of Ecolab Inc. common stock. The units will vest, subject to continued employment, as to 100% of the units on the 3rd anniversary of the date of grant. The date listed in the "Date Exercisable" column is the third anniversary of the date of grant.

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