"GameStop's stock has continued to make big moves, briefly crossing $450 a share on Thursday, fueled by Reddit users collectively taking on the Wall Street establishment. But individual investors looking to make trades have faced multiple issues on trading sites and apps over recent days, with many experiencing service disruptions, according to Bloomberg. The frenzy over GameStop stock has led to TD Ameritrade and Robinhood restricting new purchases of particular stocks (GameStop and AMC, among others). It also led to the Wall Street Bets subreddit temporarily getting locked and a Discord server getting shut down for violating terms of service.
Robinhood explained the move in a blog post Thursday morning, just before the stock exchanges opened: "In light of recent volatility, we are restricting transactions for certain securities to position closing only, including $AMC, $BB, $BBBY, $EXPR, $GME, $KOSS, $NAKD and $NOK."