Company Update

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) November 3, 2022 ​ 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 2.625% Euro Notes due 2025 ​ ECL 25 ​ New York Stock Exchange 1.000% Euro Notes due 2024 ​ ECL 24 ​ 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 8.01 Other Events . ​ On November 3, 2022, the Ecolab Board of Directors authorized the repurchase by the Corporation of up to 10,000,000 additional shares of its common stock.  Ecolab expects to conduct its purchases in the open market; in privately negotiated transactions from time-to-time, depending on market conditions; through purchases made in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934; and pursuant to accelerated share repurchase programs.  Ecolab last increased its share repurchase authorization in February 2015. Including the new authorization, Ecolab has 13,404,297 shares remaining for repurchase. ​ Item 9.01 Financial Statements and Exhibits . ​ ​ ​ ​ ​ ​ ​ (d) Exhibits. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Exhibit No. ​ Description ​ Method of Filing ​ ​ ​ ​ ​ ​ ​ ​ ​ (104) ​ Cover Page Interactive Data File. ​ Embedded within the Inline XBRL document. ​ ​ ​ ​ 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: November 4, 2022 By: /s/ David F. Duvick ​ ​ David F. Duvick ​ ​ Assistant Secretary ​ ​ 3