[Form 4] Ecolab, Inc. Insider Trading Activity

Rhea-AI Filing Summary

David W. MacLennan, a director of Ecolab Inc. (ECL), reported a purchase of 600 shares of Ecolab common stock on 08/13/2025 at a reported price of $278.513 per share. The Form 4 indicates the filing was executed by an attorney-in-fact on 08/15/2025. The report lists 20,253.49 shares as the amount of securities beneficially owned following the transaction in a direct capacity. The filing also discloses indirect holdings of 3,500 shares by the Kathleen F. MacLennan Revocable Trust and 709 shares by sibling's trusts. No derivative transactions or additional explanations are included in the form.

Positive

• Insider purchase disclosed: Director David W. MacLennan reported acquiring 600 shares on 08/13/2025 at $278.513 per share
• Clear Section 16 compliance: Form 4 filed and signed by attorney-in-fact on 08/15/2025 showing direct and indirect holdings

Negative

• None.

Insights

Corporate Governance Expert

TL;DR Director reported a routine open-market purchase of 600 shares; filing is standard Section 16 disclosure.

The Form 4 shows a straightforward purchase by a reporting director. The filing was signed by an attorney-in-fact as permitted. Disclosed indirect holdings through family trusts are explicitly stated. There are no derivative transactions, amendments, or explanatory notes attached. From a governance perspective this is a routine transparency disclosure that satisfies Section 16 reporting requirements.

Securities Analyst

TL;DR Insider bought 600 shares at $278.513; transaction size appears modest relative to typical institutional holdings.

The reported purchase on 08/13/2025 at $278.513 for 600 shares is clearly documented. The filing lists direct beneficial ownership after the purchase as 20,253.49 shares and notes indirect holdings of 3,500 and 709 shares via trusts. No options, conversions, or dispositions are reported. The disclosure provides necessary facts for monitoring insider activity but does not include information indicating a material change to ownership structure.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

MacLennan David

(Last) (First) (Middle)

C/O ECOLAB INC.

1 ECOLAB PLACE

(Street)

ST. PAUL MN 55102

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
ECOLAB INC. [ ECL ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/13/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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	08/13/2025		P		600	A	$278.513	20,253.49	D
Common Stock								3,500	I	By Kathleen F. MacLennan Revocable Trust u/a dated 11/07/2002
Common Stock								709	I	By sibling's trusts

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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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

Explanation of Responses:

	/s/ Corinne Lawson, as Attorney-in-Fact for David W. MacLennan	08/15/2025
	** Signature of Reporting Person	Date
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.

FAQ

What insider transaction did ECL director David W. MacLennan report?

He reported an open-market purchase of 600 shares of Ecolab common stock on 08/13/2025 at a price of $278.513 per share.

How many ECL shares does David W. MacLennan beneficially own after the reported transaction?

The Form 4 lists 20,253.49 shares as the amount of securities beneficially owned following the reported transaction in a direct capacity.

Does the Form 4 disclose any indirect holdings for the reporting person?

Yes. The filing discloses 3,500 shares held by the Kathleen F. MacLennan Revocable Trust and 709 shares held by sibling's trusts.

Were any derivative transactions or dispositions reported on this Form 4 for ECL?

No. Table II for derivative securities contains no reported transactions and there are no dispositions reported in the filing.

When was the Form 4 executed and who signed it?

The form was executed on 08/15/2025 and bears the signature of Corinne Lawson acting as attorney-in-fact for David W. MacLennan.