MSTRStrategy

On December, 5, 2025, Thomas C. Chow, our Executive Vice President, General Counsel and Secretary, entered into a Rule 10b5-1 trading arrangement (as defined in Item 408 of Regulation S-K) intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) of the Exchange Act. This Rule 10b5-1 trading arrangement is intended to qualify as an “eligible sell-to-cover transaction” (as described in Rule 10b5-1(c)(1)(ii)(D)(3) under the Exchange Act). This sell-to-cover arrangement applies to restricted stock units and performance stock units that have been granted or may be granted in the future to Mr. Chow (other than those that (a) by their terms require the Company to withhold shares for tax withholding obligations in connection with vesting and settlement or (b) from which the Company elects to withhold shares to satisfy tax withholding obligations in connection with vesting and settlement), and provide for the automatic sale of a number of shares of class A common stock as is necessary to cover tax withholding obligations incurred in connection with the vesting or settlement of such awards, with the proceeds of the sale delivered to the Company in satisfaction of the applicable withholding obligation. This arrangement will remain in effect indefinitely until terminated by Mr. Chow. The total number of shares of class A common stock that may be sold pursuant to this instruction is not determinable, and will vary based on the extent to which vesting conditions are satisfied, the market price of the Company’s class A common stock at the time of settlement, applicable tax rates and the potential future grant of additional equity awards subject to such arrangement.