X0304 4 2012-02-10 0000066740 3M CO MMM 0001215821 BUCKLEY GEORGE W 3M CENTER ST. PAUL MN 55144-1000 1 1 CHAIRMAN OF THE BOARD & CEO Common Stock 2012-02-10 4 M 0 289044 54.11 A 479121 D Common Stock 2012-02-10 4 S 0 4109 86.755 D 475012 D Common Stock 2012-02-10 4 S 0 1800 86.76 D 473212 D Common Stock 2012-02-10 4 S 0 400 86.765 D 472812 D Common Stock 2012-02-10 4 S 0 1000 86.77 D 471812 D Common Stock 2012-02-10 4 S 0 9545 86.775 D 462267 D Common Stock 2012-02-10 4 S 0 200 86.7775 D 462067 D Common Stock 2012-02-10 4 S 0 3300 86.78 D 458767 D Common Stock 2012-02-10 4 S 0 100 86.7818 D 458667 D Common Stock 2012-02-10 4 S 0 6400 86.785 D 452267 D Common Stock 2012-02-10 4 S 0 100 86.789 D 452167 D Common Stock 2012-02-10 4 S 0 5000 86.79 D 447167 D Common Stock 2012-02-10 4 S 0 2300 86.795 D 444867 D Common Stock 2012-02-10 4 S 0 100 86.80 D 444767 D Common Stock 2012-02-10 4 S 0 300 86.8018 D 444467 D Common Stock 2012-02-10 4 S 0 4391 86.805 D 440076 D Common Stock 2012-02-10 4 S 0 400 86.8075 D 439676 D Common Stock 2012-02-10 4 S 0 309 86.81 D 439367 D Common Stock 2012-02-10 4 S 0 2000 86.815 D 437367 D Common Stock 2012-02-10 4 S 0 200 86.82 D 437167 D Common Stock 2012-02-10 4 S 0 2800 86.825 D 434367 D Common Stock 2012-02-10 4 S 0 1100 86.83 D 433267 D Common Stock 2012-02-10 4 S 0 7700 86.835 D 425567 D Common Stock 2012-02-10 4 S 0 400 86.8375 D 425167 D Common Stock 2012-02-10 4 S 0 100 86.839 D 425067 D Common Stock 2012-02-10 4 S 0 2600 86.84 D 422467 D Common Stock 2012-02-10 4 S 0 7698 86.845 D 414769 D Common Stock 2012-02-10 4 S 0 1800 86.85 D 412969 D Common Stock 2012-02-10 4 S 0 7232 86.855 D 405737 D Non-qualified Stock Option (Right to Buy) 54.11 2012-02-10 4 M 0 289044 0 D 2010-02-09 2019-02-08 Common Stock 289044 0 D George Ann Biros, attorney-in-fact for George W. Buckley 2012-02-13