X0303 4 2011-06-30 0000066740 3M CO MMM 0001215821 BUCKLEY GEORGE W 3M CENTER ST. PAUL MN 55144-1000 1 1 CHAIRMAN OF THE BOARD & CEO Common Stock 2011-06-30 4 M 0 48118 78.15 A 185536.113 D Common Stock 2011-06-30 4 S 0 44918 95.00 D 140618.113 D Common Stock 2011-06-30 4 S 0 1200 95.01 D 139418.113 D Common Stock 2011-06-30 4 S 0 1500 95.02 D 137918.113 D Common Stock 2011-06-30 4 S 0 500 95.03 D 137418.113 D Common Stock 2011-07-01 4 M 0 118632 78.15 A 256050.113 D Common Stock 2011-07-01 4 S 0 109992 95.00 D 146058.113 D Common Stock 2011-07-01 4 S 0 3231 95.01 D 142827.113 D Common Stock 2011-07-01 4 S 0 4009 95.02 D 138818.113 D Common Stock 2011-07-01 4 S 0 900 95.03 D 137918.113 D Common Stock 2011-07-01 4 S 0 400 95.04 D 137518.113 D Common Stock 2011-07-01 4 S 0 100 95.05 D 137418.113 D Non-qualified Stock Option (Right to Buy) 78.15 2011-06-30 4 M 0 48118 0 D 2006-12-06 2015-12-06 Common Stock 48118 118632 D Non-qualified Stock Option (Right to Buy) 78.15 2011-07-01 4 M 0 118632 0 D 2006-12-06 2015-12-06 Common Stock 118632 0 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2011. Patricia L. Meagher, attorney-in-fact for George W. Buckley 2011-07-05