John O’Rourke of Riot Blockchain and Robert Ladd of MGT Capital have both been named as defendants in a U.S. Securities and Exchange Commission (SEC) complaint related to $27 million of alleged "pump-and-dump" schemes. Neither Riot Blockchain nor MGT Capital were named in the complaint though it appears MGT shares might have been involved. O’Rourke has officially resigned from Riot while Ladd announced a leave of absence from MGT.