ECOLAB INC. (ECL) · Initial Holdings (Form 3) SEC Filing

=== SEC Form 3 — Statement of Changes in Beneficial Ownership === Document Type: 3 Period of Report: 2026-08-07 --- Issuer --- Name: ECOLAB INC. (ECL) CIK: 0000031462 --- Reporting Owner --- Name: Mewhorter Bryce L CIK: 0002142701 Role: Officer (SVP & Corporate Controller) --- Holdings --- [Holding #1] Security: Common Stock Ownership: D (Direct) [Holding #2] Security: Common Stock Ownership: I (Indirect) Footnotes: [F1] Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of July 31, 2026. (The 292.826 UNITS are the equivalent of approximately 537 SHARES of the issuer's Common Stock.) [Holding #3] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #4] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #5] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #6] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #7] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #8] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #9] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #10] Security: Employee Stock Option (Right to Buy) Ownership: D (Direct) Footnotes: [F2] The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. [Holding #11] Security: Restricted Stock Units Ownership: D (Direct) Footnotes: [F3] Each restricted stock unit represents a contingent right to receive one share of Ecolab Inc. common stock. The units will vest, subject to continued employment, as to 100% of the units on the 3rd anniversary of the date of grant. The date listed in the "Date Exercisable" column is the third anniversary of the date of grant. --- Footnotes (Complete Index) --- F1: Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of July 31, 2026. (The 292.826 UNITS are the equivalent of approximately 537 SHARES of the issuer's Common Stock.) F2: The option became or becomes exercisable, on a cumulative basis, as to one-third of the option shares (excluding any fractional portion less than one share), on each of the first and second anniversaries of the date of grant and as to the remaining shares on the third anniversary of the date of grant. The date listed in the "Date Exercisable" column is the first anniversary of the date of grant. F3: Each restricted stock unit represents a contingent right to receive one share of Ecolab Inc. common stock. The units will vest, subject to continued employment, as to 100% of the units on the 3rd anniversary of the date of grant. The date listed in the "Date Exercisable" column is the third anniversary of the date of grant. --- Signature --- /s/ /s/ Corinne Lawson, as Attorney-in-Fact for Bryce L. Mewhorter (2026-08-07)