Riot Platforms, Inc.

During the three months ended September 30, 2025, none of our directors or officers (as defined in Rule 16a-1(f) under the Exchange Act) adopted, modified, or terminated any contract, instruction or written plan for the purchase or sale of our securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act or any “non-Rule 10b5-1 arrangement” as defined in Item 408(c) of Regulation S-K (“10b5-1 Plan”), except as follows:

On August 25, 2025, Jason Les, Chief Executive Officer of the Company, entered into a 10b5-1 Plan providing for the potential sale of up to 1,050,000 shares of our common stock, subject to sales only when the market price of our common stock is higher than certain minimum threshold prices between the first potential sale date of December 1, 2025 and the scheduled expiration date of the 10b5-1 Plan of November 2, 2026.

On September 4, 2025, Colin Yee, Chief Financial Officer of the Company, entered into a 10b5-1 Plan providing for the potential sale of up to 48,577 shares of our common stock. The first sale date shall be April 1, 2026, and the 10b5-1 Plan shall remain in effect until the earlier of the scheduled expiration date of April 1, 2027, or such time as the 10b5-1 Plan is otherwise terminated according to its terms.