UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )*
CompoSecure, Inc.
(Name of Issuer)
Class A Common Stock, $0.0001 par value per share
(Title of Class of Securities)
77584N200
(CUSIP Number)
March 28, 2022
(Date of event which requires filing of this statement)
Check the appropriate box to designate the rule pursuant to which this Schedule 13G is filed:
☐	Rule 13d-1(b)
☒	Rule 13d-1(c)
☐	Rule 13d-1(d)

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	LMR Master Fund Ltd
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			580,213 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			580,213 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	580,213 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	3.7% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO

(1)	Includes 580,213 shares of Class A Common Stock of CompoSecure, Inc. (the “Issuer”) issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the Securities and Exchange Commission (the “SEC”) on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	LMR CCSA Master Fund Ltd
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	Cayman Islands
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			580,213 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			580,213 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	580,213 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	3.7% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO

(1)	Includes 580,213 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	LMR Partners LLP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	United Kingdom
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			1,160,426 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			1,160,426 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,160,426 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	7.2% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	PN, IA

(1)	Includes 1,160,426 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	LMR Partners Limited
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	Hong Kong
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			1,160,426 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			1,160,426 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,160,426 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	7.2% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO, IA

(1)	Includes 1,160,426 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	LMR Partners LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	State of Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			1,160,426 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			1,160,426 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,160,426 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	7.2% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	OO, IA

(1)	Includes 1,160,426 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	LMR Partners AG
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	Switzerland
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			1,160,426 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			1,160,426 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,160,426 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	7.2% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	CO, IA

(1)	Includes 1,160,426 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	Ben Levine
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	United Kingdom
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			1,160,426 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			1,160,426 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,160,426 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	7.2% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	IN, HC

(1)	Includes 1,160,426 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

CUSIP No. 77584N200

13G

1	NAMES OF REPORTING PERSONS
	Stefan Renold
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
	(a)☐
	(b)☐
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION
	Switzerland
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER
			0
		6	SHARED VOTING POWER
			1,160,426 (1)
		7	SOLE DISPOSITIVE POWER
			0
		8	SHARED DISPOSITIVE POWER
			1,160,426 (1)
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
	1,160,426 (1)
10	CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)
	☐
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
	7.2% (1)(2)
12	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
	IN, HC

(1)	Includes 1,160,426 shares of Class A Common Stock of the Issuer issuable upon the exercise of warrants.

(2)	Based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the SEC on March 23, 2022.

Item 1(a).	NAME OF ISSUER:
	The name of the issuer is CompoSecure, Inc. (the "Issuer").

Item 1(b).	ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
	The Issuer's principal executive offices are located at 309 Pierce Street Somerset, New Jersey 08873.

Item 2(a).

NAME OF PERSON FILING:

This statement is filed by:

	(i)	LMR Master Fund Ltd ("LMR Master Fund"), with respect to the shares of Class A Common Stock (as defined in Item 2(d)) held by it;
	(ii)	LMR CCSA Master Fund Ltd ("LMR CCSA Master Fund"), with respect to the shares of Class A Common Stock (as defined in Item 2(d)) held by it;
	(iii)	LMR Partners LLP, LMR Partners Limited, LMR Partners LLC and LMR Partners AG (collectively, the "LMR Investment Managers"), which serve as the investment managers to certain funds, including, without limitation, LMR Master Fund and LMR CCSA Master Fund, with respect to the shares of Class A Common Stock held by LMR Master Fund and LMR CCSA Master Fund; and
	(iv)	Ben Levine and Stefan Renold, who are ultimately in control of the investment and voting decisions of the LMR Investment Managers with respect to the securities held by LMR Master Fund and LMR CCSA Master Fund.

The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons."

Item 2(b).	ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
	The address of the principal business office of each of the Reporting Persons is c/o LMR Partners LLP, 9th Floor, Devonshire House, 1 Mayfair Place, London, W1J 8AJ, United Kingdom.

Item 2(c).	CITIZENSHIP:
	LMR Master Fund is a Cayman Islands exempted company. LMR CCSA Master Fund is a Cayman Islands exempted company. LMR Partners LLP is a United Kingdom limited liability partnership. LMR Partners Limited is a Hong Kong corporation. LMR Partners LLC is a Delaware limited liability company. LMR Partners AG is a Swiss corporation.  Ben Levine is a citizen of the United Kingdom. Stefan Renold is a citizen of Switzerland.

Item 2(d).	TITLE OF CLASS OF SECURITIES:
	Class A Common Stock, $0.0001 par value per share ("Class A Common Stock").

Item 2(e).	CUSIP NUMBER:
	77584N200

Item 3.

IF THIS STATEMENT IS FILED PURSUANT TO RULES 13d-1(b) OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A:   Not Applicable

Item 4.	OWNERSHIP.
	The information required by Items 4(a) - (c) is set forth in Rows 5 - 11 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	Each of LMR Master Fund and LMR CCSA Master Fund directly holds warrants to purchase 580,213 shares of Class A Common Stock (“Warrants”). The shares of Class A Common Stock held by each of LMR Master Fund and LMR CCSA Master Fund represent approximately 3.7% and the shares of Class A Common Stock held by LMR Master Fund and LMR CCSA Master Fund in the aggregate represent approximately 7.2% of the outstanding shares of Class A Common Stock, based on 14,929,982 shares of Class A Common Stock of the Issuer outstanding as of March 11, 2022, as reported in the Issuer’s Form 424B3 filed with the Securities and Exchange Commission on March 23, 2022, and shares that may be owned by such Reporting Persons within 60 days.

Item 5.	OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
	Not applicable.

Item 7.	IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.
	Not applicable.

Item 8.	IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
	Not applicable.

Item 9.	NOTICE OF DISSOLUTION OF GROUP.
	Not applicable.

Item 10.

CERTIFICATION.

	Each of the Reporting Persons hereby makes the following certification:
	By signing below each Reporting Person certifies that, to the best of his or its knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.