Sec Form 3 Filing - HOLLIN MITCHELL L @ CompoSecure, Inc. - 2021-12-27

FORM 3 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 HOLLIN MITCHELL L 2. Issuer Name and Ticker or Trading Symbol CompoSecure, Inc. [ CMPO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O COMPOSECURE, INC., 309 PIERCE STREET 3. Date of Earliest Transaction (MM/DD/YY) 12/27/2021 (Street) SOMERSET, NJ08873 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

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 Class B Common Stock, $0.0001 par value ( 1 ) ( 1 ) ( 1 ) Class A Common Stock, $0.0001 par value 33,071,603 I By LLR Equity Partners IV, L.P.( 2 ) Class B Common Stock, $0.0001 par value ( 1 ) ( 1 ) ( 1 ) Class A Common Stock, $0.0001 par value 1,454,805 I By LLR Equity Partners Parallel IV, L.P.( 3 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other HOLLIN MITCHELL L C/O COMPOSECURE, INC. 309 PIERCE STREET SOMERSET, NJ08873 X X Signatures /s/ Mitchell Hollin, by attorney-in-fact Steven J. Feder 12/29/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Consists of shares of Class B Common Stock (which are unregistered), and a corresponding number of Class B Common Units issued by CompoSecure Holdings, L.L.C. (a subsidiary of the Issuer) (which are also unregistered) that are exchangeable for Class A Common Stock on a share-for-share basis, subject to adjustment, and a corresponding cancellation of the Class B Common Stock, held by the Reporting Person. ( 2 )Securities held directly by LLR Equity Partners IV, L.P. LLR Capital IV, L.P. is the general partner of LLR Equity Partners IV, L.P. LLR Capital IV, LLC is the general partner of LLR Capital IV, L.P. The Reporting Person is a member of LLR Capital IV, LLC, and may be deemed to share beneficial ownership of the securities held by LLR Capital IV, LLC. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for the purposes of Section 16 or for any other purpose. ( 3 )Securities held directly by LLR Equity Partners Parallel IV, L.P. LLR Capital IV, L.P. is the general partner of LLR Equity Partners Parallel IV, L.P. LLR Capital IV, LLC is the general partner of LLR Capital IV, L.P. The Reporting Person is a member of LLR Capital IV, LLC, and may be deemed to share beneficial ownership of the securities held by LLR Capital IV, LLC. The Reporting Person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for the purposes of Section 16 or for any other purpose.

Remarks: Exhibit 24 - Power of Attorney

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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