UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 18, 2023

CompoSecure, Inc.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (908) 518-0500

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company x

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

CompoSecure, Inc. (the “Company”) held its 2023 Annual Meeting of Stockholders (the “Annual Meeting”) on May 18, 2023. At the Annual Meeting, the following matters were submitted to a vote of stockholders:

At the close of business on March 24, 2023, the record date for the determination of stockholders entitled to vote at the Annual Meeting, there were 18,367,859 shares of the Company’s Class A Common Stock outstanding and entitled to vote at the Annual Meeting, and there were 59,958,422 shares of the Company’s Class B Common Stock outstanding and entitled to vote at the Annual Meeting. Under the Company’s Second Amended and Restated Certificate of Incorporation, the holders of the Company’s Class A Common Stock and Class B Common Stock (collectively, “Common Stock”) at all times vote together as one class on all matters submitted to a vote of the stockholders. The holders of 72,836,464 shares of Common Stock were represented virtually or by proxy at the Annual Meeting, constituting a quorum.

At the Annual Meeting, (i) the two Class II directors were elected and (ii) the appointment of the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023 was ratified.

Proposal No. 1 — Election of the Class II Directors

The vote with respect to the election of each of the directors was as follows:

Proposal No. 2 — Ratification of the Appointment of Independent Registered Public Accounting Firm

The vote with respect to the ratification of the appointment of Grant Thornton LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2023 was as follows:

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.