144 0001721702 XXXXXXXX LIVE 0001167419 Riot Platforms, Inc. 001-33675 3855 Ambrosia Street, Suite 301 Castle Rock CO 80109 303-794-2000 Jason Les CEO Director Common Stock JP Morgan Securities LLC

390 Madison Avenue 6th Floor New York NY 10017

50000 567500 175078000 05/25/2023 NASDAQ Common Stock 05/20/2021 Transfer Jason Les, who acquired from Issuer on 04/26/21 N 4375 05/20/2021 N/A Common Stock 12/07/2021 Transfer Jason Les, who acquired from Issuer on 12/07/21 N 31250 12/07/2021 N/A Common Stock 02/17/2022 Transfer Jason Les, who acquired from Issuer on 02/17/22 N 14375 02/17/2022 N/A Y The shares filed today will be sold by the Jason M. Les Trust, Jason Les as Trustee 05/25/2023 /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Jason Les