144 0001801537 XXXXXXXX LIVE 0000031462 ECOLAB INC. 001-09328 1 ECOLAB PLACE ST. PAUL MN 55102 651-250-3323 Machiel Duijser Officer Common Stock Merrill Lynch, Pierce, Fenner & Smith Inc.

10400 NE 4th Street Suite 2500 Bellevue WA 98004

5721 1499074 283161817 02/13/2025 NYSE Common Stock 02/26/2021 Restricted stock unit vesting Issuer N 1453 02/26/2021 N/A Common Stock 02/26/2022 Restricted stock unit vesting Issuer N 2903 02/26/2022 N/A Common Stock 02/26/2023 Restricted stock unit vesting Issuer N 1365 02/26/2023 N/A Y 02/13/2025 /s/ Youhao Duijser, as Attorney-in-Fact for Machiel Duijser