Sec Form 4 Filing - Martin Mary A. @ USG CORP - 2017-02-08

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Martin Mary A. 2. Issuer Name and Ticker or Trading Symbol USG CORP [ USG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Vice President (Last) (First) (Middle) C/O USG CORPORATION, 550 WEST ADAMS STREET 3. Date of Earliest Transaction (MM/DD/YY) 02/08/2017 (Street) CHICAGO, IL60661 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 02/08/2017 A 5,000 ( 1 ) A $ 0 26,211 D Common Stock 02/08/2017 M 2,556 ( 2 ) A $ 0 28,767 D Common Stock 02/08/2017 F 931 ( 3 ) D $ 31.49 27,836 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Market Share Units ( 2 ) 02/08/2017 M 2,904 ( 2 ) ( 2 ) Common Stock ( 2 ) $ 0 0 D Market Share Units ( 4 ) 02/08/2017 A 3,224 ( 5 ) ( 5 ) Common Stock 3,224 $ 0 3,224 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Martin Mary A. C/O USG CORPORATION 550 WEST ADAMS STREET CHICAGO, IL60661 Vice President Signatures /s/ Jonathan Dorfman, Attorney-In-Fact 02/09/2017 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Restricted stock units that vest on the earlier of (a) the third anniversary of the date of grant, or (b) retirement (provided that retirement is no earlier than the second anniversary of the date of the grant). Each unit represents the right to receive one share of common stock. ( 2 )These Market Share Units were granted on February 12, 2014. The Board of Directors (the "Board") certified performance of these Market Share Units on February 8, 2017 and USG Corporation (the "Company") issued to the reporting person .88 shares of the Company's common stock for the Market Share Units originally granted, based on the closing prices of shares of the Company's common stock on the New York Stock Exchange for the first fifteen trading days in January 2017. ( 3 )Shares withheld to satisfy tax withholding obligation with respect to Market Share Units that became earned. ( 4 )Each Market Share Unit represents the right to receive one share of common stock assuming certain market price targets are achieved. The Market Share Units vesting and the actual number of shares received are contingent on the Company's common stock achieving certain pre-defined market price levels during the performance period and continued employment. ( 5 )Generally, the Market Share Units will be earned, if at all, once the Board certifies that pre-determined market price targets of the Company's common stock are attained, provided that the reporting person remains continuously employed by the Company or a subsidiary through December 31, 2019.

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 4(b)(v).

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