X0306 4 2013-05-02 0 0000031462 ECOLAB INC ECL 0001189430 LEVIN JERRY W J. W. LEVIN PARTNERS, LLC 9 WEST 57TH STREET, 26TH FLOOR NEW YORK NY 10019 1 0 0 0 Common Stock 2013-05-03 4 S 0 5421 84.9070 D 28286.19 D Common Stock 2013-05-03 4 M 0 6700 29.29 A 34986.19 D Common Stock 2013-05-03 4 F 0 2303 85.205 D 32683.19 D Common Stock 2013-05-03 4 M 0 5600 32.57 A 38283.19 D Common Stock 2013-05-03 4 F 0 2140 85.205 D 36143.19 D Common Stock 2013-05-03 4 M 0 5086 31.945 A 41229.19 D Common Stock 2013-05-03 4 F 0 1906 85.205 D 39323.19 D Common Stock 2013-05-03 4 M 0 4800 37.905 A 44123.19 D Common Stock 2013-05-03 4 F 0 2135 85.205 D 41988.19 D Common Stock 2013-05-03 4 M 0 4300 42.905 A 46288.19 D Common Stock 2013-05-03 4 F 0 2165 85.205 D 44123.19 D Stock Option (Right to Buy) 84.265 2013-05-02 4 A 0 3200 0.00 A 2013-08-02 2023-05-02 Common Stock 3200 3200 D Stock Option (Right to Buy) 29.29 2013-05-03 4 M 0 6700 0.00 D 2004-05-07 2014-05-07 Common Stock 6700 0 D Stock Option (Right to Buy) 32.57 2013-05-03 4 M 0 5600 0.00 D 2005-05-06 2015-05-06 Common Stock 5600 0 D Stock Option (Right to Buy) 31.945 2013-05-03 4 M 0 5086 0.00 D 2005-08-30 2014-05-07 Common Stock 5086 0 D Stock Option (Right to Buy) 37.905 2013-05-03 4 M 0 4800 0.00 D 2006-05-12 2016-05-12 Common Stock 4800 0 D Stock Option (Right to Buy) 42.905 2013-05-03 4 M 0 4300 0.00 D 2007-05-04 2017-05-04 Common Stock 4300 0 D This transaction was executed in multiple trades at prices ranging from $84.90 to $84.95. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Reflects the reporting person's payment of the exercise price for a stock option issued in accordance with Rule 16b-3 by delivering or withholding shares of Ecolab common stock. The option will become exercisable, on a cumulative basis, as to 25% of the option shares (excluding any fractional portion less than one share), on the last day of each of the first, second and third three-month periods following its date of grant and as to the remaining shares on the last day of the fourth three-month period following its date of grant; provided, however, that if a Change in Control of the Company (as that term is defined in the Ecolab Inc. 2001 Non-Employee Director Stock Option and Deferred Compensation Plan) will occur, then the option will become immediately exercisable in full. /s/David F. Duvick, Attorney-in-Fact for Jerry Levin 2013-05-06