Robinhood has announced this restriction on their blog here: https://blog.robinhood.com/news/2021/1/28/keeping-customers-informed-through-market-volatility http

Robinhood has announced this restriction on their blog here: https://blog.robinhood.com/news/2021/1/28/keeping-customers-informed-through-market-volatility https://blog.robinhood.com/news/2021/1/28/keeping-customers-... . > We continuously monitor the markets and make changes where necessary. In light of recent volatility, we are restricting transactions for certain securities to position closing only, including $AAL, $AMC, $BB, $BBY, $CTRM, $EXPR, $GME, $KOSS, $NAKD, $NOK, $SNDL, $TR, and $TRVG. We also raised margin requirements for certain securities.