X0306 4 2012-12-07 0 0000031462 ECOLAB INC ECL 0001198756 FRITZE STEVEN L ECOLAB INC. 370 WABASHA STREET N. ST. PAUL MN 55102 0 1 0 0 Former Chief Financial Officer Common Stock 2012-12-07 4 M 0 83200 34.075 A 223599 D Common Stock 2012-12-07 4 F 0 57975 72.36 D 165624 D Common Stock 12742.703 I By Ecolab Savings Plan Employee Stock Option (Right to Buy) 34.075 2012-12-07 4 M 0 83200 0.00 D 2006-12-07 2015-12-07 Common Stock 83200 83200 D Reflects the reporting person's payment of the exercise price and witholding taxes for a stock option issued in accordance with Rule 16b-3 by delivering or withholding shares of Ecolab common stock. Number of UNITS in the Ecolab Stock Fund of the Ecolab Savings Plan (401(k) Plan) as of November 30, 2012. (The 12,742.703 UNITS are the equivalent of approximately 23,672 SHARES of the issuer's Common Stock.) Option granted under the Ecolab Inc. 2005 Stock Incentive Plan on December 7, 2005. 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 option shares on the third anniversary of the date of grant. /s/David F. Duvick, Attorney-in-Fact for Steven L. Fritze 2012-12-10