Coinbase stock jumps in Nasdaq debut

Shares of the San Francisco-based cryptocurrency exchange, which trade under the ticker COIN, opened for trading at $381 apiece, giving the company a valuation of about $99.5 billion. 

GameStop stock price frenzy: What to know

Trading volume has surged in shares of GameStop, AMC Entertainment, as well as Bed Bath & Beyond and BlackBerry, stunning Wall Street firms betting that those stocks would fall.