Robinhood no longer allows users to buy GameStop, AMC, BlackBerry shares

Users can't buy GameStop shares, or shares of AMC, BlackBerry, or Nokia, on Robinhood anymore.  The company said Thursday it has restricted transactions for certain securities "amid significant market volatility." Numerous Robinhood users have confirmed this on Twitter. When they tried to open one of the stocks, they got a message that said, "You can close out your position in this stock, but you cannot purchase additional shares." The complete list of shares that currently cannot be bought thr...