Shares of AMC hit new highs Wednesday amid a volatile trading day, which triggered several brief trading halts. The surge has been fueled by retail investors, who account for 80% of AMC's investor base. JJ Kinahan, chief market strategist at T.D. Ameritrade, and Gunjan Banerji, markets reporter at the Wall Street Journal's Money & Investing Team, joined "Squawk Box" on Thursday to discuss. For access to live and exclusive video from CNBC subscribe to CNBC PRO: https://cnb.cx/2NGeIvi

» Subscribe to CNBC TV: https://cnb.cx/SubscribeCNBCtelevision