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 S 0 100 86.9375 D 285087 D Common Stock 2012-02-10 4 S 0 3800 86.94 D 281287 D Common Stock 2012-02-10 4 S 0 1300 86.945 D 279987 D Common Stock 2012-02-10 4 S 0 3929 86.95 D 276058 D Common Stock 2012-02-10 4 S 0 7645 86.96 D 268413 D Common Stock 2012-02-10 4 S 0 6700 86.965 D 261713 D Common Stock 2012-02-10 4 S 0 400 86.9675 D 261313 D Common Stock 2012-02-10 4 S 0 100 86.969 D 261213 D Common Stock 2012-02-10 4 S 0 3386 86.97 D 257827 D Common Stock 2012-02-10 4 S 0 850 86.98 D 256977 D Common Stock 2012-02-10 4 S 0 1428 86.99 D 255549 D Common Stock 2012-02-10 4 S 0 200 86.995 D 255349 D Common Stock 2012-02-10 4 S 0 20976 87.00 D 234373 D Common Stock 2012-02-10 4 S 0 100 87.002 D 234273 D Common Stock 2012-02-10 4 S 0 5211 87.01 D 229062 D Common Stock 2012-02-10 4 S 0 100 87.015 D 228962 D Common Stock 2012-02-10 4 S 0 3707 87.02 D 225255 D Common Stock 2012-02-10 4 S 0 5205 87.03 D 220050 D Common Stock 2012-02-10 4 S 0 3834 87.04 D 216216 D Common Stock 2012-02-10 4 S 0 3510 87.05 D 212706 D Common Stock 2012-02-10 4 S 0 2699 87.06 D 210007 D Common Stock 2012-02-10 4 S 0 1300 87.065 D 208707 D Common Stock 2012-02-10 4 S 0 1571 87.07 D 207136 D Common Stock 2012-02-10 4 S 0 100 87.0702 D 207036 D Common Stock 2012-02-10 4 S 0 100 87.0703 D 206936 D Common Stock 2012-02-10 4 S 0 1256 87.08 D 205680 D Common Stock 2012-02-10 4 S 0 900 87.09 D 204780 D Common Stock 2012-02-10 4 S 0 3200 87.095 D 201580 D Common Stock 2012-02-10 4 S 0 2677 87.10 D 198903 D Common Stock 2012-02-10 4 S 0 2300 87.105 D 196603 D George Ann Biros, attorney-in-fact for George W. Buckley 2012-02-13