David MacLennan - 12 Nov 2025 Form 4 Insider Report for ECOLAB INC. (ECL)

Role: Director
Signature: /s/ Corinne Lawson, as Attorney-in-Fact of David W. MacLennan
Issuer symbol: ECL
Transactions as of: 12 Nov 2025
Transactions value $: -$451
Form type: 4
Filing time: 13 Nov 2025, 16:44:59
Previous filing: 06 Nov 2025
Next filing: 26 Nov 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
MacLennan David	Director	C/O ECOLAB INC., 1 ECOLAB PLACE, ST. PAUL	/s/ Corinne Lawson, as Attorney-in-Fact of David W. MacLennan	13 Nov 2025	0001498535

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ECL	Common Stock	Options Exercise	$380K	+3.3K	+16.15%	$115.08	23.7K	12 Nov 2025	Direct
transaction	ECL	Common Stock	Tax liability	-$380K	-1.45K	-6.11%	$262.03	22.3K	12 Nov 2025	Direct	F1
holding	ECL	Common Stock						3.5K	12 Nov 2025	By Kathleen F. MacLennan Revocable Trust u/a dated 11/07/2002
holding	ECL	Common Stock						709	12 Nov 2025	By sibling's trusts

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	Non-Employee Stock Option (Right to Buy)	Options Exercise	$0	-3.3K	-50%	$0.00	3.3K	12 Nov 2025	Common Stock	3.3K	$115.08	Direct	F2

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

Explanation of Responses:

Id	Content
F1	Reflects the reporting person's payment of the exercise price for a stock option issued in accordance with Rule 16b-3 by delivering or withholding shares of Ecolab common stock.
F2	The option became exercisable, on a cumulative basis, as to 25% of the option shares (excluding any fractional portion less than one share), on the last day of each of the first, second and third three-month periods following its date of grant and as to the remaining shares on the last day of the fourth three-month period following its date of grant. The date listed in the Date Exercisable column represents the first vesting date.

Content

Reflects the reporting person's payment of the exercise price for a stock option issued in accordance with Rule 16b-3 by delivering or withholding shares of Ecolab common stock.

The option became exercisable, on a cumulative basis, as to 25% of the option shares (excluding any fractional portion less than one share), on the last day of each of the first, second and third three-month periods following its date of grant and as to the remaining shares on the last day of the fourth three-month period following its date of grant. The date listed in the Date Exercisable column represents the first vesting date.