Mario Gabelli, a major Viacom and CBS shareholder, wants the media giants separate for now By: CNBC.com News September 21, 2018 at 14:23 PM EDT "CBS is a loaded laggard," the billionaire value investor says. "Viacom is an even doubly loaded laggard." Read More >> Related Stocks: CBS Corp Gamco Investors Via Renewables Inc Viacom