Shock jock Howard Stern’s manager and production company are suing SiriusXM radio claiming Howard was cheated out of stock awards SiriusXM promised him. According to the suit, Sirius courted Howard to move to their company promising him a share “in any success that the company achieved” but once Sirius bought out its chief competitor, XM and acquired more than 20 million subscribers, it decided Howard had been paid enough. The suit seeks unspecified damages.