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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 8-K

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CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

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Date of Report (Date of earliest event reported) October 28, 2025

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ECOLAB INC.

(Exact name of registrant as specified in its charter)

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Delaware | ​ | 1-9328 | ​ | 41-0231510
(State or other jurisdiction of incorporation) | ​ | (Commission File No.) | ​ | (IRS Employer Identification No.)

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1 Ecolab Place, Saint Paul, Minnesota | ​ | ​ | ​ | 55102
(Address of principal executive offices) | ​ | ​ | ​ | (Zip Code)

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Registrant’s telephone number, including area code 1-800-232-6522

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(Not applicable)

(Former name or former address, if changed since last report.)

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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):

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☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

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☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

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☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

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☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

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Securities registered pursuant to Section 12(b) of the Act:

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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 ​

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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 ☐

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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. ☐

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Item 2.02 Results of Operations and Financial Condition.

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On October 28, 2025, Ecolab Inc. (“Ecolab”) announced earnings for the third quarter ended September 30, 2025. A copy of the (i) News Release issued by Ecolab in connection with this report under Item 2.02 is furnished and attached as Exhibit (99.1) and (ii) Supplemental Data to be used in connection with the conference call to be held discussing the first quarter results is furnished and attached as Exhibit (99.2), each of which is incorporated by reference herein. Ecolab also will publish the attached exhibits on its website located at www.ecolab.com.

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Item 9.01 Financial Statements and Exhibits.

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(d) | Exhibits.

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The following exhibits are furnished pursuant to Item 2.02 of Form 8-K and should not be deemed to be “filed” under the Securities Exchange Act of 1934.

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Exhibit No. | ​ | Description | ​ | Method Of Filing | ​
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(99.1) | ​ | Ecolab Inc. News Release dated October 28, 2025. | ​ | Filed herewith electronically. | ​
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(99.2) | ​ | Supplemental Data for Third Quarter dated October 28, 2025. | ​ | Filed herewith electronically. | ​
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(104) | ​ | Cover Page Interactive Data File. | ​ | Embedded within the Inline XBRL document. | ​

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SIGNATURE

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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.

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​ | ECOLAB INC.
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Date: October 28, 2025 | By: | /s/ Youhao Dong
​ | ​ | Youhao Dong
​ | ​ | Assistant Secretary

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