https://techcrunch.com/2021/01/29/robinhood-limits-users-to-a-single-share-of-gamestop-and-other-stocks/

Robinhood has detailed its latest step in the complex quagmire of market manipulation that is this week’s GameStop hedge fund Reddit army debacle. Users will for the present be limited to holding a single share of GameStop and dozens of other stocks.

Several stocks were limited to five shares, and options contracts are likewise limited on many of the most-traded stocks this week, such as AMC and Blackberry. Positions exceeding these amounts will not be automatically sold, but they will apply if the user goes under them and tries to buy again. Fractional shares are also prohibited.