Stocks making the biggest moves after hours: GameStop, Boot Barn, Blackberry and more - CNBC

GameStop — Shares of the video game retailer jumped 6% in extended trading, continuing its recent trend of volatile moves amid a frenzy of retail trading.

During Monday's regular trading hours, the stock traded up more than 100% and in negative territory within hours.

Boot Barn — Shares of the retailer slipped more than 2% after the company declined to give forward guidance within its quarterly earnings report, citing uncertainty regarding the pandemic.