Sec Form 4 Filing - COOK BRIAN J @ USG CORP - 2019-02-13

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

OMB APPROVAL OMB Number: 3235-0287 Expires: November 30, 2011 Estimated average burden hours per response... 0.5

1. Name and Address of Reporting Person COOK BRIAN J 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) Executive Vice President (Last) (First) (Middle) C/O USG CORPORATION, 550 WEST ADAMS STREET 3. Date of Earliest Transaction (MM/DD/YY) 02/13/2019 (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 02/13/2019 A 1,660 ( 1 ) ( 2 ) A $ 0 50,762 D Common Stock 02/13/2019 F 484 ( 3 ) D $ 43.17 50,278 D Common Stock 02/13/2019 M 3,392 ( 1 ) ( 4 ) A $ 0 53,670 D Common Stock 02/13/2019 F 1,096 ( 5 ) D $ 43.17 52,574 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 ( 1 ) ( 4 ) 02/13/2019 M 2,261 ( 1 )( 4 ) ( 1 )( 4 ) Common Stock ( 1 ) ( 4 ) $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other COOK BRIAN J C/O USG CORPORATION 550 WEST ADAMS STREET CHICAGO, IL60661 Executive Vice President Signatures /s/ Jonathan Dorfman, Attorney-In-Fact 02/14/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As previously disclosed, on November 8, 2018, the Board of Directors (the "Board") of USG Corporation (the "Company") approved the acceleration of the vesting of 90% of the Market Share Units and Performance Shares granted to the reporting person in 2016, as determined based on achievement of specified performance metrics, that were otherwise scheduled to vest between January 1, 2019 and March 30, 2019. Such accelerated Market Share Units and Performance Shares vested on December 26, 2018. The Board approved the accelerated vesting of such grants in order to mitigate the potential impact of Section 280G of the Internal Revenue Code of 1986, as amended, on the Company and the reporting person in connection with the pending merger of an indirect wholly-owned subsidiary of Gebr. Knauf KG with and into the Company. The transactions reported in this Form 4 represent the vesting of the remaining 10% of the Market Share Units and Performance Shares granted to the reporting person in 2016. ( 2 )These Performance Shares were granted on February 10, 2016. The Board certified performance of these Performance Shares on February 13, 2019. ( 3 )Shares withheld to satisfy tax withholding obligation with respect to Performance Shares that became earned. ( 4 )These Market Share Units were granted on February 10, 2016. The Board certified performance of these Market Share Units on February 13, 2019 and the Company issued to the reporting person 1.5 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 2019. ( 5 )Shares withheld to satisfy tax withholding obligation with respect to Market Share Units that became earned.

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).

** 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.