X0306 4 2018-02-02 0000066740 3M CO MMM 0001577544 Roman Michael F 3M CENTER ST. PAUL MN 55144-1000 1 Executive Vice President Common Stock 2018-02-02 4 M 0 4146 77.18 A 16208.159 D Common Stock 2018-02-02 4 S 0 100 246.59 D 16108.159 D Common Stock 2018-02-02 4 S 0 100 246.61 D 16008.159 D Common Stock 2018-02-02 4 S 0 200 246.62 D 15808.159 D Common Stock 2018-02-02 4 S 0 300 246.63 D 15508.159 D Common Stock 2018-02-02 4 S 0 100 246.64 D 15408.159 D Common Stock 2018-02-02 4 S 0 300 246.65 D 15108.159 D Common Stock 2018-02-02 4 S 0 2146 246.6575 D 12962.159 D Common Stock 2018-02-02 4 S 0 800 246.66 D 12162.159 D Common Stock 2018-02-02 4 S 0 100 246.69 D 12062.159 D Common Stock 2018-02-02 4 M 0 2458 77.18 A 14520.159 D Non-qualified Stock Option (Right to Buy) 77.18 2018-02-02 4 M 0 4146 0 D 2009-05-13 2018-05-13 Common Stock 4146 2458 D Non-qualified Stock Option (Right to Buy) 77.18 2018-02-02 4 M 0 2458 0 D 2009-05-13 2018-05-13 Common Stock 2458 0 D This form is being filed to report the exercise of a 3M stock option by means of a cashless-sell-to-cover method (selling enough shares to cover option share purchase price, fee and taxes, then retaining the remaining shares). Includes shares acquired under 3M's General Employee Stock Purchase Plan. /s/ Sheila B. Claugherty, attorney-in-fact for Michael F. Roman 2018-02-05