X0306 4 2020-02-21 0 0000031462 ECOLAB INC. ECL 0001433832 Berger Larry L 1 ECOLAB PLACE SAINT PAUL MN 55102 0 1 0 0 EVP & CTO Common Stock 2020-02-21 4 M 0 4000 103.265 A 33432 D Common Stock 2020-02-21 4 M 0 12235 107.685 A 45667 D Common Stock 2020-02-21 4 S 0 16235 207.748 D 29432 D Common Stock 71.536 I By Ecolab Savings Plan Employee Stock Option (Right to Buy) 103.265 2020-02-21 4 M 0 4000 0 D 2014-12-04 2023-12-04 Common Stock 4000 0 D Employee Stock Option (Right to Buy) 107.685 2020-02-21 4 M 0 12235 0 D 2015-12-03 2024-12-03 Common Stock 12235 0 D This transaction was executed in multiple trades at prices ranging from $207.600 to $207.880, inclusive. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of January 31, 2020. Includes 0.172 UNITS acquired since the reporting person's last report. (The 71.536 UNITS are the equivalent of approximately 131 SHARES of the issuer's Common Stock.) The option became 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 reflected in the Date Exercisable column is the first anniversary of the date of grant. /s/ David F. Duvick, as Attorney-in-Fact for Larry L. Berger 2020-02-25