144 0001052192 XXXXXXXX LIVE 0000031462 ECOLAB INC. 001-09328 1 Ecolab Place Saint Paul MN 55102 1-800-232-6522 Cascade Investment, L.L.C. (1) 10% Stockholder Common Stock Morgan Stanley & Co. LLC

1999 Avenue of the Stars Los Angeles CA 90067

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock BofA Securities, Inc.

One Bryant Park New York NY 10036

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Watermill Institutional Trading, LLC

111 Town Square Suite 1520 Jersey City NJ 07310

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Liquidnet, Inc.

620 8th Avenue 20th Floor New York NY 10018

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Luminex Trading & Analytics LLC

99 Summer Street Suite 1700 Boston MA 02210

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Instinet, LLC (Blockcross/Instinet)

309 West 49th Street New York NY 10282

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Virtu Americas LLC

1633 Broadway 41st Floor New York NY 10019

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Williams Trading LLC

450 Post Road East Suite 120 Westport CT 06880

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock Bernstein Institutional Services LLC

245 Park Ave New York NY 10167

856692 210515006.71 283161817 10/31/2024 NYSE Common Stock 08/16/2022 Open Market Purchase Open Market N 76927 08/18/2022 Cash Common Stock 08/15/2022 Open Market Purchase Open Market N 66952 08/17/2022 Cash Common Stock 08/18/2022 Open Market Purchase Open Market N 24855 08/20/2022 Cash Common Stock 08/18/2022 Open Market Purchase Open Market N 21043 08/20/2022 Cash Common Stock 08/17/2022 Open Market Purchase Open Market N 66427 08/19/2022 Cash Common Stock 08/12/2022 Open Market Purchase Open Market N 35939 08/14/2022 Cash Common Stock 08/19/2022 Open Market Purchase Open Market N 37255 08/21/2022 Cash Common Stock 08/11/2022 Open Market Purchase Open Market N 79738 08/13/2022 Cash Common Stock 08/11/2022 Open Market Purchase Open Market N 69452 08/13/2022 Cash Common Stock 08/22/2022 Open Market Purchase Open Market N 21412 08/24/2022 Cash Common Stock 03/16/2018 Open Market Purchase Open Market N 15000 03/18/2018 Cash Common Stock 03/16/2018 Open Market Purchase Open Market N 60800 03/18/2018 Cash Common Stock 03/14/2018 Open Market Purchase Open Market N 87460 03/16/2018 Cash Common Stock 03/13/2018 Open Market Purchase Open Market N 150641 03/15/2018 Cash Common Stock 03/13/2018 Open Market Purchase Open Market N 42791 03/15/2018 Cash Y (1) Neither the filing of this Form 144 nor anything herein shall be construed as an admission that the seller is an affiliate of the issuer. (2) It is intended that the 856,692 shares will be allocated between one or more of the brokers listed on this Form 144 above. 10/31/2024 Cascade Investment, L.L.C. by /s/ Alan Heuberger, attorney-in-fact for Michael Larson, Business Manager