X0304 4/A 2012-02-15 2012-02-17 0 0000277135 GRAINGER W W INC GWW 0001451437 Macpherson Donald G 100 GRAINGER PARKWAY LAKE FOREST IL 60045-5201 0 1 0 0 Sr. VP, Global Supply Chain Common Stock 2012-02-15 4 F 0 1496 187.19 D 27224 D The reason for the amendment is to report correctly the price associated with the number of shares withheld to cover tax liability as well as the number of shares withheld for the Reporting Person as reported on the Form 4 filed on 2/17/2012. John L. Howard, as attorney-in-fact 2012-02-24