X0306 4 2017-02-22 0 0000031462 ECOLAB INC. ECL 0001275967 HANDLEY THOMAS W 1 ECOLAB PLACE SAINT PAUL MN 55102 0 1 0 0 President and COO Common Stock 2017-02-22 4 A 0 9470 0.00 A 17231.664 D Common Stock 2017-02-22 4 F 0 3402 122.89 D 13829.664 D Common Stock 27675 I By 2015 GRAT Common Stock 75556.155 I By 2016 GRAT Common Stock 717 I By child #1 trust Common Stock 717 I By child #2 trust Common Stock 556.470 I By Ecolab Savings Plan Reflects the reporting person's payment of minimum statutory tax obligations by withholding shares of Ecolab Common Stock incident to the vesting of performance-based restricted stock units in accordance with Rule 16b-3. Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of January 31, 2017. Includes 1.703 UNITS acquired since the reporting person's last report. (The 556.470 UNITS are the equivalent of approximately 1,025 SHARES of the issuer's Common Stock.) /s/ David F. Duvick, as Attorney-in-Fact for Thomas W. Handley 2017-02-24