144 0001779234 XXXXXXXX LIVE 0000031462 ECOLAB INC. 001-09328 1 ECOLAB PLACE ST. PAUL MN 55102 1-800-232-6522 KIRKLAND SCOTT D. Officer Common Stock Morgan Stanley Smith Barney LLC - Executive Services 200 W Civic Center Drive 4th Floor Sandy UT 84070 3357 952381 281437502 07/30/2026 NYSE Common Stock 07/30/2026 Employee stock option exercise Issuer N 3972 07/30/2026 Broker-assisted cashless exercise Y 07/30/2026 /s/ Corinne Lawson, as Attorney-in-Fact for Scott D. Kirkland