Director David MacLennan adds Ecolab (ECL) shares in $256.912 open-market buy

Filing Impact

(Moderate)

Filing Sentiment

(Positive)

Form Type

Rhea-AI Filing Summary

Ecolab Inc. director David MacLennan reported an open-market purchase of 800 shares of Ecolab common stock on May 4, 2026 at a price of $256.912 per share. This transaction increases his reported direct holdings to 24,230.010 shares of common stock.

He also reports indirect ownership of 709 shares held by sibling's trusts and 3,500 shares held by the Kathleen F. MacLennan Revocable Trust u/a dated 11/07/2002, providing additional exposure to Ecolab stock through related entities.

Insights

Director made an open-market share purchase, modest relative to his reported holdings.

David MacLennan, a director of Ecolab Inc., executed an open-market purchase of 800 common shares at $256.912 per share on May 4, 2026. Open-market purchases are discretionary transactions and often reflect the insider’s choice to increase equity exposure at the prevailing market price.

Following the trade, his reported direct ownership stands at 24,230.010 shares. He also lists indirect holdings of 709 shares via sibling's trusts and 3,500 shares via the Kathleen F. MacLennan Revocable Trust. With no derivative positions reported in this filing, the picture centers on common stock holdings and this incremental addition.

Insider Trade Summary

Net Buyer: 800 shares ($205,530)

Net Buy 3 txns

Insider MacLennan David

Role null

Bought 800 shs ($206K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	800	$256.912	$206K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 24,230.01 shares (Direct, null); Common Stock — 3,500 shares (Indirect, By Kathleen F. MacLennan Revocable Trust u/a dated 11/07/2002)

Footnotes (1)

Key Figures

Shares purchased: 800 shares Purchase price: $256.912 per share Direct holdings after transaction: 24,230.010 shares +2 more

5 metrics

Shares purchased 800 shares Open-market purchase on May 4, 2026

Purchase price $256.912 per share Price for Ecolab common stock in this transaction

Direct holdings after transaction 24,230.010 shares Ecolab common stock directly owned by David MacLennan after purchase

Indirect holdings via sibling's trusts 709 shares Ecolab common stock held indirectly by sibling's trusts

Indirect holdings via revocable trust 3,500 shares Ecolab common stock held by Kathleen F. MacLennan Revocable Trust

Key Terms

open-market purchase, indirect ownership, revocable trust, Form 4

4 terms

open-market purchase financial

"Purchase in open market or private transaction"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

indirect ownership financial

"ownership_type": "indirect","ownership_code": "I""

revocable trust financial

"By Kathleen F. MacLennan Revocable Trust u/a dated 11/07/2002"

A revocable trust is a legal arrangement where the person who creates it keeps control and can change or cancel the trust at any time, while naming who will manage and receive the assets later. Think of it like a flexible folder for your investments and property that can be relabeled or reworked as circumstances change; it matters to investors because it determines how ownership is recorded, how easily assets transfer on incapacity or death, and whether holdings bypass public probate proceedings.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

05/05/2026 - 05:27 PM

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

MINNESOTA

55102

(City)

(State)

(Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/04/2026

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

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

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

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/04/2026		P		800	A	$256.912	24,230.01	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

	/s/ Corinne Lawson, as Attorney-in-Fact for David W. MacLennan	05/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Ecolab (ECL) director David MacLennan report?

Director David MacLennan reported an open-market purchase of 800 Ecolab common shares. The shares were bought on May 4, 2026 at a price of $256.912 per share, increasing his reported direct ownership in the company’s stock.

At what price did David MacLennan buy Ecolab (ECL) shares in this Form 4?

He purchased Ecolab common stock at $256.912 per share. This price reflects the cost for the 800 shares acquired on May 4, 2026, as disclosed in the Form 4 insider trading report filed for the director.

How many Ecolab (ECL) shares does David MacLennan own directly after the transaction?

After the reported transaction, David MacLennan directly owns 24,230.010 Ecolab common shares. This total reflects his position following the open-market purchase of 800 shares at $256.912 per share on May 4, 2026.

What indirect Ecolab (ECL) holdings are reported for David MacLennan on this Form 4?

The filing shows 709 Ecolab shares held indirectly through sibling's trusts and 3,500 shares held by the Kathleen F. MacLennan Revocable Trust. These positions are reported as indirect ownership interests associated with the director.

Does this Ecolab (ECL) Form 4 show any derivative securities for David MacLennan?

No derivative securities are listed for David MacLennan in this Form 4. The reported positions focus on Ecolab common stock, including the new 800-share open-market purchase and both direct and indirect common-share holdings.