Platinum Equity lists 52,829,757 CompoSecure shares

PE Titan CS Holdings, L.P., an affiliate of Platinum Equity, is reported as the record holder of 52,829,757 shares of CompoSecure, Inc. Class A common stock as of 01/12/2026, shown as indirectly owned on a Form 3 initial statement of beneficial ownership.

Rhea-AI Filing Summary

PE Titan CS Holdings, L.P., an affiliate of Platinum Equity, is reported as the record holder of 52,829,757 shares of CompoSecure, Inc. Class A common stock as of 01/12/2026, shown as indirectly owned on a Form 3 initial statement of beneficial ownership.

The filing explains that PE Titan CS Holdings, L.P. is controlled through a chain of Platinum Equity entities, and that, by virtue of these relationships, those entities and Tom Gores may be deemed to share beneficial ownership of the shares held by PE Titan CS Holdings, L.P. The filing does not reflect a new transaction, but rather discloses an existing ownership position in CompoSecure (CMPO).

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider PLATINUM EQUITY, LLC, Platinum Equity Investment Holdings, LLC, Platinum Equity Investment Holdings IC (Cayman), LLC, Platinum Equity InvestCo, L.P., Platinum Equity Investment Holdings IV, LLC, Platinum Equity Investment Holdings IV (Cayman), LLC, Platinum Equity Partners International IV (Cayman), L.P., PE Titan CS Holdings, L.P., Gores Tom

Role 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner | 10% Owner

Type	Security	Shares	Price	Value
holding	Class A Common Stock	--	--	--

Holdings After Transaction: Class A Common Stock — 52,829,757 shares (Indirect, See footnote)

Footnotes (1)

1. F1. PE Titan CS Holdings, L.P. (the "Platinum Stockholder") is the record holder of the securities reported herein. Tom Gores is the manager of Platinum Equity, LLC, which is the sole member of Platinum Equity Investment Holdings, LLC, which is the sole member of Platinum Equity Investment Holdings IC (Cayman), LLC, which is the general partner of Platinum Equity InvestCo, L.P., which is the sole member of Platinum Equity Investment Holdings IV, LLC, which is the sole member of Platinum Equity Investment Holdings IV (Cayman), LLC, which is the general partner of Platinum Equity Partners International IV (Cayman), L.P., which is the general partner of the Platinum Stockholder. By virtue of these relationships, each of these entities and Mr. Gores may be deemed to share beneficial ownership of the securities held of record by the Platinum Stockholder.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many CompoSecure (CMPO) shares are reported on this Form 3?

The Form 3 reports that 52,829,757 shares of CompoSecure, Inc. Class A common stock are beneficially owned, all shown under indirect ownership.

Who is the record holder of the CompoSecure (CMPO) shares on this Form 3?

The filing states that PE Titan CS Holdings, L.P. (the "Platinum Stockholder") is the record holder of the 52,829,757 CompoSecure Class A shares reported.

What is the relationship between Platinum Equity and the CompoSecure (CMPO) holdings?

The Form 3 explains that PE Titan CS Holdings, L.P. is controlled through a chain of entities affiliated with Platinum Equity, and that each of these entities and Tom Gores may be deemed to share beneficial ownership of the shares held by PE Titan CS Holdings, L.P.

Does this CompoSecure (CMPO) Form 3 show a new insider transaction?

No specific purchase or sale amount is reported. The Form 3 identifies an existing beneficial ownership position of 52,829,757 Class A shares rather than detailing a new transaction.

Why are multiple Platinum Equity entities and Tom Gores listed as reporting persons for CMPO?

Because of the described ownership chain, the filing states that each entity and Tom Gores may be deemed to share beneficial ownership of the shares held of record by PE Titan CS Holdings, L.P., so they are listed as reporting persons on the Form 3.

Is the ownership of CompoSecure (CMPO) shares direct or indirect on this Form 3?

The 52,829,757 CompoSecure Class A shares are reported in Table I as indirect (I) ownership, with the nature of ownership described in the accompanying footnote.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 01/20/2026 - 04:30 PM Learn about SEC filing dates

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

PLATINUM EQUITY, LLC

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/12/2026

3. Issuer Name and Ticker or Trading Symbol
CompoSecure, Inc. [ CMPO ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock	52,829,757	I	See footnote(1)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person^*

PLATINUM EQUITY, LLC

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Platinum Equity Investment Holdings, LLC

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Platinum Equity Investment Holdings IC (Cayman), LLC

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Platinum Equity InvestCo, L.P.

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Platinum Equity Investment Holdings IV, LLC

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Platinum Equity Investment Holdings IV (Cayman), LLC

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Platinum Equity Partners International IV (Cayman), L.P.

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

PE Titan CS Holdings, L.P.

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

1. Name and Address of Reporting Person^*

Gores Tom

(Last) (First) (Middle)

C/O PLATINUM EQUITY ADVISORS, LLC

360 NORTH CRESCENT DRIVE, SOUTH BUILDING

(Street)

BEVERLY HILLS CA 90210

(City) (State) (Zip)

Relationship of Reporting Person(s) to Issuer

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

Explanation of Responses:

1. PE Titan CS Holdings, L.P. (the "Platinum Stockholder") is the record holder of the securities reported herein. Tom Gores is the manager of Platinum Equity, LLC, which is the sole member of Platinum Equity Investment Holdings, LLC, which is the sole member of Platinum Equity Investment Holdings IC (Cayman), LLC, which is the general partner of Platinum Equity InvestCo, L.P., which is the sole member of Platinum Equity Investment Holdings IV, LLC, which is the sole member of Platinum Equity Investment Holdings IV (Cayman), LLC, which is the general partner of Platinum Equity Partners International IV (Cayman), L.P., which is the general partner of the Platinum Stockholder. By virtue of these relationships, each of these entities and Mr. Gores may be deemed to share beneficial ownership of the securities held of record by the Platinum Stockholder.

Remarks:

Exhibit 24 - Power of Attorney.

	Platinum Equity, LLC, By: /s/ Mary Ann Sigler, Executive Vice President, Chief Financial Officer and Treasurer	01/20/2026
	Platinum Equity Investment Holdings, LLC, By: /s/ Mary Ann Sigler, Vice President, Secretary and Treasurer	01/20/2026
	Platinum Equity Investment Holdings IC (Cayman), LLC, By: /s/ Mary Ann Sigler, President	01/20/2026
	Platinum Equity InvestCo, L.P., By: Platinum Equity Investment Holdings IC (Cayman), LLC, its general partner, By: /s/ Mary Ann Sigler, President	01/20/2026
	Platinum Equity Investment Holdings IV, LLC, By: /s/ Ty Renbarger, Vice President	01/20/2026
	Platinum Equity Investment Holdings IV (Cayman), LLC, By: /s/ Ty Renbarger, Vice President	01/20/2026
	Platinum Equity Partners International IV (Cayman), L.P., By: Platinum Equity Investment Holdings IV (Cayman), LLC, its general partner, By: /s/ Ty Renbarger, Vice President	01/20/2026
	PE Titan CS Holdings, L.P., By: Platinum Equity Partners International IV (Cayman), L.P., its GP, By Platinum Equity Investment Holdings IV (Cayman), LLC, its GP, By: /s/ Ty Renbarger, Vice President	01/20/2026
	Tom Gores, By: /s/ Mary Ann Sigler, Attorney-in-Fact	01/20/2026
	** Signature of Reporting Person	Date
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 5 (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.