Shares of Vistra Corp. (NYSE:VST – Get Free Report) traded down 8% on Tuesday . Approximately 11,458,143 shares traded hands during mid-day trading, an increase of 130% from the average session volume of 4,986,137 shares. Weiss Ratings raised shares of Vistra from a “hold (c)” rating to a “hold (c+)” rating in a report on Friday. Finally, Salomon & Ludwin LLC boosted its holdings in shares of Vistra by 74.8% during the 4th quarter. Vistra Company Profile(Get Free Report)Vistra (NYSE: VST) is an integrated power company that develops, owns and operates electricity generation and retail businesses in the United States.