Executive Change

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549   FORM 8-K   CURRENT REPORT  Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934   Date of Report (Date of earliest event reported) July 14, 2025   ECOLAB INC. (Exact name of registrant as specified in its charter)   Delaware   1-9328   41-0231510 (State or other jurisdiction of incorporation)   (Commission File No.)   (IRS Employer Identification No.)   1 Ecolab Place , Saint Paul , Minnesota 55102 (Address of principal executive offices) (Zip Code)   Registrant’s telephone number, including area code  1- 800 - 232-6522   (Not applicable) (Former name or former address, if changed since last report.)   Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):   ¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)   ¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)   ¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))   ¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))   Securities registered pursuant to Section 12(b) of the Act:   Title of each class   Trading symbol(s)   Name of each exchange on which registered Common Stock, $1.00 par value   ECL   New York Stock Exchange   Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).   Emerging growth company ¨   If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨             Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers .   After leading Ecolab Inc.’s (the “Company”) world-class supply chain functions for the past five years, on July 14, 2025, Machiel Duijser tendered his resignation as Executive Vice President and Chief Supply Chain Officer of the Company, in order to accept a senior executive position at another publicly traded company. Mr. Duijser will depart the Company on July 25, 2025. The Company has a succession plan and is appointing an internal successor. Mr. Duijser’s resignation is not due to any disagreement with the Company on any matter relating to the Company’s operations, policies or practices.   2     SIGNATURE   Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.     ECOLAB INC.     Date:         July 18, 2025 By: /s/ Youhao Dong     Youhao Dong     Assistant Secretary   3