Nicholas J. Alfano - 03 Dec 2025 Form 4 Insider Report for ECOLAB INC. (ECL)

Role: EVP & PRES - GLOBAL WATER
Signature: /s/ Youhao Dong, as Attorney-in-Fact for Nicholas J. Alfano
Issuer symbol: ECL
Transactions as of: 03 Dec 2025
Transactions value $: $0
Form type: 4
Date filed: 05 Dec 2025, 16:10
Previous filing: 09 May 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Alfano Nicholas J.	EVP & PRES - GLOBAL WATER	1 ECOLAB PLACE, SAINT PAUL	/s/ Youhao Dong, as Attorney-in-Fact for Nicholas J. Alfano	2025-12-05	0001972462

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	ECL	Common Stock						4.72K	03 Dec 2025	Direct	F1
holding	ECL	Common Stock						1.48K	03 Dec 2025	By Ecolab Savings Plan	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ECL	Employee Stock Option (Right to Buy)	Award	$0	+8.12K		$0.00	8.12K	03 Dec 2025	Common Stock	8.12K	$268.52	Direct	F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The total includes 9.972 shares resulting from automatic dividend reinvestment in transactions exempt pursuant to Rule 16a-11 under Section 16 of the Securities Exchange Act of 1934.
F2	Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of November 30, 2025. Includes 12.533 UNITS acquired since the reporting person's last report. Since the last report, the reporting person transferred 3,265.492 SHARES (equivalent to 1,782.217 UNITS) to his ex-spouse pursuant to a domestic relations order. The reporting person no longer reports as beneficially owned any securities owned by his ex-spouse. (The 1,477.031 UNITS are the equivalent of approximately 2,710 SHARES of the issuer's Common Stock.)
F3	The option will be 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.