Sec Form 4 Filing - SANDBROOK WILLIAM J @ U.S. CONCRETE, INC. - 2021-03-11

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 SANDBROOK WILLIAM J 2. Issuer Name and Ticker or Trading Symbol U.S. CONCRETE, INC. [ USCR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O U.S. CONCRETE, INC., 331 N. MAIN ST. 3. Date of Earliest Transaction (MM/DD/YY) 03/11/2021 (Street) EULESS, TX76039 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 03/11/2021 M 11,720 ( 1 ) A $ 0 408,804 D Common stock 1,512 I By Reporting Person as UGMA custodian for granddaughter

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 Restricted stock units ( 2 ) 03/11/2021( 1 ) M 11,720 ( 3 ) ( 3 ) Common stock 11,720 $ 0 11,720 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other SANDBROOK WILLIAM J C/O U.S. CONCRETE, INC. 331 N. MAIN ST. EULESS, TX76039 X Signatures /s/ CiCi S. Sepehri, as Attorney-in-Fact for William J. Sandbrook 03/15/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The March 1, 2019 stock award's third performance-based target of a 20-day consecutive trading day threshold of $54.10 per share, as set forth in footnote 3, was achieved. ( 2 )Each Restricted Stock Unit was granted from the U.S. Concrete, Inc. Long Term Incentive Plan and represents the right to receive one share of common stock upon vesting. ( 3 )Pursuant to the Mr. Sandbrook's executive transition agreement filed with the SEC via Form 8-K on February 14, 2020, the Performance-Based portion of the March 1, 2019 Restricted Stock Units would result in his vesting into shares if the average of the daily volume weighted average share price (VWAP) over any period of 20 consecutive trading days attains (i) $54.10 per share (resulting in his vesting into 11,720 shares) and (ii) $58.60 per share (resulting in his further vesting into 11,720 shares) within the three-year period from the date of grant.

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).

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