SEC Form 3
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
McGrath Marlene Mary

(Last) (First) (Middle)
3M CENTER

(Street)
ST. PAUL MN 55144-1000

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
04/04/2012
3. Issuer Name and Ticker or Trading Symbol
3M CO [ MMM ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Sr VP - Human Resources
5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock 1,949 D
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (2) (2) Common Stock 911 (1) D
Non-qualified Stock Option (Right to Buy) 05/12/2005 05/09/2014 Common Stock 2,020 84.4 D
Non-qualified Stock Option (Right to Buy) 05/09/2007 05/09/2016 Common Stock 2,236 87.35 D
Non-qualified Stock Option (Right to Buy) 05/08/2008 05/08/2017 Common Stock 2,560 84.78 D
Non-qualified Stock Option (Right to Buy) 05/13/2009 05/13/2018 Common Stock 1,131 77.18 D
Non-qualified Stock Option (Right to Buy) 02/09/2010 02/08/2019 Common Stock 1,335 54.11 D
Non-qualified Stock Option (Right to Buy)(3) 02/09/2011 02/07/2020 Common Stock 4,100 78.72 D
Non-qualified Stock Option (Right to Buy)(4) 02/08/2012 02/08/2021 Common Stock 3,573 89.47 D
Non-qualified Stock Option (Right to Buy)(5) 02/07/2013 02/07/2022 Common Stock 5,360 87.89 D
Explanation of Responses:
1. Each restricted stock unit represents a contingent right to receive one share of 3M common stock.
2. The restricted stock units will vest on 2/9/2013.
3. This option becomes exercisable in equal installments on each of the first three anniversaries of the grant date (2/9/2010).
4. This option becomes exercisable in equal installments on each of the first three anniversaries of the grant date (2/8/2011).
5. This option becomes exercisable in equal installments on each of the first three anniversaries of the grant date (2/7/2012).
/s/ George Ann Biros, attorney-in-fact for Marlene M. McGrath 04/11/2012
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.