CompoSecure Inc

Rule 10b5-1 Trading Plans.

During the quarter ended September 30, 2024, the following officers of the Company entered into and/or terminated trading plans intended to satisfy the affirmative defense conditions of Rule 10b5-1(c):

•On August 14, 2024, Adam Lowe, Chief Product & Innovation Officer of the Company, terminated his pre-existing trading plan (adopted on June 12, 2024); and then on September 12, 2024, Mr. Lowe entered into a new plan covering the potential sale of 178,923 shares of Common Stock, all of which would be acquired upon exercise of stock options. This plan is scheduled to commence on December 13, 2024 and terminate on the earlier of December 31, 2025 or the date all shares subject to the plan have been sold.

•On August 14, 2024, Amanda Gourbault, Chief Revenue Officer of the Company, terminated her pre-existing trading plan (adopted June 14, 2024).

Transactions under each of these plans are based upon pre-established stock price thresholds and will only occur upon the expiration of the applicable mandatory cooling-off period.

Other than the plans described above, during the quarter ended September 30, 2024, none of the Company’s directors or officers informed the Company of theadoption ortermination of a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Regulation S-K, Item 408.