Sec Form 4 Filing - Swinbank Christian T. @ NRC GROUP HOLDINGS CORP. - 2019-11-01

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 Swinbank Christian T. 2. Issuer Name and Ticker or Trading Symbol NRC GROUP HOLDINGS CORP. [ NRCG] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Principal Executive Officer (Last) (First) (Middle) C/O NRC GROUP HOLDINGS CORP., 952 ECHO LANE, SUITE 460 3. Date of Earliest Transaction (MM/DD/YY) 11/01/2019 (Street) HOUSTON, TX77024 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 11/01/2019 D 206,476 ( 1 ) ( 2 ) D 0 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Swi nbank Christian T. C/O NRC GROUP HOLDINGS CORP. 952 ECHO LANE, SUITE 460 HOUSTON, TX77024 Principal Executive Officer Signatures /s/ Joseph Peterson, attorney-in-fact 11/01/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Pursuant to the merger agreement between NRC Group Holdings Corp. (the "Issuer"), US Ecology, Inc., US Ecology Parent, Inc. ("Holdco"), Rooster Merger Sub, Inc. and ECOL Merger Sub, Inc. (the "Merger Agreement"), each share of the Issuer's common stock issued and outstanding immediately prior to the effective time of the mergers (the "Effective Time") was converted into the right to receive, and became exchangeable for, (1) 0.196 of a share of Holdco common stock for each share of the Issuer's common stock and (2) any cash in lieu of fractional shares of Holdco common stock. The Holdco common stock had a market value of approximately $62.23 per share at the close of market immediately prior to the Effective Time. ( 2 )Includes unvested restricted stock units representing a contingent right to receive 152,742 shares of NRCG common stock upon vesting and settlement of such restricted stock units. The restricted stock units vest in three equal annual installments with the first tranche having vested on October 17, 2019 and the next tranches vesting on October 17, 2020 and October 17, 2021, respectively, subject to the satisfaction of the terms and conditions in the restricted stock unit agreement. The unvested restricted stock units were assumed by Holdco in the mergers and replaced with restricted stock units to receive shares of Holdco common stock as set forth in the Merger Agreement.

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