X0206 3 2021-05-26 0 0001167419 Riot Blockchain, Inc. RIOT 0001863502 Northern Data AG AN DER WELLE 3 FRANKFURT AM MAIN 2M 60322 GERMANY true Common Stock, no par value 11800000 D These securities were acquired by Northern Data AG, a German stock corporation ("Northern Data"), pursuant to that certain Stock Purchase Agreement, dated April 8, 2021, by and among Northern Data, Whinstone US, Inc., a corporation incorporated under the laws of the State of Delaware, and Riot Blockchain, Inc., a corporation incorporated under the laws of the State of Nevada. /s/ Aroosh Thillainathan, Chief Executive Officer 2021-05-27