X0508 4 2025-07-21 0001167419 Riot Platforms, Inc. RIOT 0001721702 Les Jason C/O RIOT PLATFORMS, INC. 3855 AMBROSIA STREET, SUITE 301 CASTLE ROCK CO 80109 true true false false CEO 1 Common Stock 2025-07-21 4 S 0 100000 15.12 D 919911 I See Footnote Common Stock 7253244 D The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2024. These shares were sold on the indicated date in a series of multiple transactions at prices ranging from $15.00 to $15.245, inclusive, per share. The price reported above reflects the weighted average sales price. The Reporting Person undertakes to provide, upon request by the SEC staff, the Issuer, or a security holder of the Issuer, full information regarding the number of shares and prices at which the transactions were effected. Shares held in trust by Jason M. Les, as Trustee of The Jason M. Les Trust dated March 8, 2021. /s/ Tanya McGill, Attorney-in-Fact for Jason Les 2025-07-23