Earnings

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. ​ Cautionary Statements Regarding Forward Looking Information . ​ Statements contained in this Current Report on Form 8-K, including statements…

Results of Operations and Financial Condition . ​ Ecolab Inc. (“Ecolab” or the “Company”) is providing as an exhibit to this Current Report on Form 8-K a table (Exhibit 99.1) with supplemental unaudited reportable segment information for the years ended December 31, 2025 and December 31, 2024 reflecting international operations at the fixed currency exchange rates established by Company management at the beginning of 2026. The exhibit also reflects changes to the Company’s segment reporting s…

of Form 8-K and should not be deemed to be “filed” under the Securities Exchange Act of 1934. Exhibit No. Description Method Of Filing (99.1) Ecolab Inc. News Release dated March 20, 2026. Filed herewith electronically. (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.…

of Form 8-K and should not be deemed to be “filed” under the Securities Exchange Act of 1934. ​ ​ ​ ​ ​ ​ ​ ​ Exhibit No. ​ Description ​ Method Of Filing ​ ​ ​ ​ ​ ​ ​ (99.1) ​ Ecolab Inc. News Release dated February 10, 2026. ​ Filed herewith electronically. ​ ​ ​ ​ ​ ​ ​ (99.2) ​ Supplemental Data for Fourth Quarter dated February 10, 2026. ​ Filed herewith electronically. ​ ​ ​ ​ ​ ​ ​ (104) ​ Cover Page Interactive Data File. ​ Embedded within the Inline XBRL document. ​ ​ ​ 2 ​ SIGNATUR…