Riot Platforms, Inc.

During the three months ended December 31, 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 , except as follows:

On October 31, 2025, Jason Les, the Company’s Chief Executive Officer, terminated a 10b5-1 Plan established September 10, 2024, in accordance with the terms of the plan.

On December 2, 2025, Ryan Werner, the Company’s Chief Accounting Officer, adopted a 10b5-1 Plan providing for the potential sale of up to 469,434 shares of the Company’s common stock, subject to sales occurring only when the market price of our common stock is greater than certain minimum threshold prices during the period beginning on the first potential sale date of March 3, 2026 and ending on the scheduled expiration date of the 10b5-1 Plan on February 16, 2027.

On December 6, 2025, Mr. Werner terminated a 10b5-1 Plan established December 13, 2024, in accordance with the terms of the plan.