PLATINUM EQUITY, LLC - 12 Jan 2026 SCHEDULE 13D Report for CompoSecure, Inc. Class A Common Stock, par value $0.0001 per share (CMPO)

Filing Manager
PLATINUM EQUITY, LLC
Reporting Manager
Platinum Equity, LLC
Security
CompoSecure, Inc. Class A Common Stock, par value $0.0001 per share
Symbol
CMPO
Shares outstanding
288,687,197 shares
Disclosed Ownership
52,829,757 shares
Ownership
18%
Form type
SCHEDULE 13D
Filing time
20 Jan 2026, 16:30:10 UTC
Date of event
12 Jan 2026
SEC
View on sec.gov

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Quoteable Key Fact

"PLATINUM EQUITY, LLC disclosed 18% ownership in CompoSecure, Inc. Class A Common Stock, par value $0.0001 per share (CMPO) on 12 Jan 2026."

Quick Takeaways

  • PLATINUM EQUITY, LLC filed SCHEDULE 13D for CompoSecure, Inc. Class A Common Stock, par value $0.0001 per share (CMPO).
  • Disclosed ownership: 18%.
  • Date of event: 12 Jan 2026.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 20 Jan 2026, 16:30.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (9)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Platinum Equity, LLC 18% 52,829,757 0 52,829,757 /s/ Mary Ann Sigler Mary Ann Sigler, Executive Vice President, Chief Financial Officer and Treasurer 0001228754
Platinum Equity Investment Holdings, LLC 18% 52,829,757 0 52,829,757 /s/ Mary Ann Sigler Mary Ann Sigler, Vice President, Secretary and Treasurer 0001634372
Platinum Equity Investment Holdings IC (Cayman), LLC 18% 52,829,757 0 52,829,757 /s/ Mary Ann Sigler Mary Ann Sigler, President 0001756330
Platinum Equity InvestCo, L.P. 18% 52,829,757 0 52,829,757 By: Platinum Equity Investment Holdings IC (Cayman), LLC, its general partner, /s/ Mary Ann Sigler Mary Ann Sigler, President 0001756331
Platinum Equity Investment Holdings IV, LLC 18% 52,829,757 0 52,829,757 /s/ Ty Renbarger Ty Renbarger, Vice President 0001756333
Platinum Equity Investment Holdings IV (Cayman), LLC 18% 52,829,757 0 52,829,757 /s/ Ty Renbarger Ty Renbarger, Vice President 0001785531
Platinum Equity Partners International IV (Cayman), L.P. 18% 52,829,757 0 52,829,757 By: Platinum Equity Investment Holdings IV (Cayman), LLC, its general partner, /s/ Ty Renbarger Ty Renbarger, Vice President 0001785528
PE Titan CS Holdings, L.P. 18% 52,829,757 0 52,829,757 By: Platinum Equity Partners International IV (Cayman), L.P., its GP, Platinum Equity Investment Holdings IV (Cayman), LLC, its GP, /s/ Ty Renbarger Ty Renbarger, Vice President 0002104295
Tom Gores 18% 52,829,757 0 52,829,757 /s/ Mary Ann Sigler Mary Ann Sigler, Attorney-in-Fact 0001471783

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