"Market Movers: GameStop, Robinhood, and More Pre and Post-Market Surges"

TL;DR
GameStop and Concentrix are among the stocks making significant moves after hours, with GameStop's shares rising and Concentrix's falling. The after-hours trading activity reflects the ongoing volatility in the market, impacting various companies' stock prices.
- Stocks making the biggest moves after hours: GameStop, Concentrix and more CNBC
- Stocks making the biggest moves premarket: Robinhood, GameStop, Merck and more CNBC
- GameStop falls premarket; Merck, Robinhood and Moderna rise Investing.com
- GameStop, Trump Media, Merck, Shockwave Medical, nCino, Carnival, and More Market Movers Barron's
- 5 Things to Know Before the Stock Market Opens Investopedia
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