X0303 4/A 2011-02-07 2011-02-09 0000066740 3M CO MMM 0001348355 Lalor Angela S 3M CENTER ST. PAUL MN 55144-1000 1 VICE PRESIDENT HR Common Stock 2011-02-07 4 A 0 1268.242 0 A 5704.242 D Common Stock 2011-02-07 4 F 0 427.242 89.47 D 5277 D Common Stock 2011-02-07 4 A 0 2355.308 0 A 2355.308 I By Corporation Common Stock 2011-02-07 4 F 0 81.25 89.47 D 2274.058 I By Corporation On February 9, 2011, the reporting person reported the imminent delivery of a number of shares of 3M Common Stock earned as a result of the 2008 performance shares awarded to such person under the 3M Performance Unit Plan. The number of shares to be withheld from this delivery for the payment of withholding taxes was unknown. This amendment is being filed to update the Form 4 with the number of shares used for tax withholding, in addition to correcting the number of shares to be delivered. The amount reported on February 9, 2011 reflected a rounded whole number of shares, while the amount of shares actually earned includes a fractional share of stock. This updated Form 4 reflects the shares earned without rounding. On February 9, 2011, the reporting person reported the deferred receipt of a number of shares of 3M Common Stock earned as the result of the 2008 performance shares awarded to such person under the 3M Performance Unit Plan. The number of shares to be withheld for payment of FICA withholding taxes was unknown. This amendment is being filed to update the Form 4 with the number of shares used for FICA withholding. The amount reported on February 9, 2011 also reflected a rounded whole number of shares, while the amount actually earned includes a fractional share of stock. This updated Form 4 reflects the shares earned without rounding. Under the terms of the 3M Deferred Compensation Plan, the reporting person elected to defer receipt of these shares which become payable one year after the reporting person retires. There are no voting or investment powers with respect to these shares. Includes shares acquired under 3M's General Employee Stock Purchase Plan. George Ann Biros, attorney-in-fact for Angela Lalor 2011-02-23