GameStop drops 44% after Robinhood and others restrict trading

Retail brokerages restricted trading on Thursday in GameStop and other stocks caught in a frenzy that has captivated Wall Street and caused big losses for hedge funds.

Free-stock trading pioneer Robinhood and Interactive Brokers said that in some cases, investors would be able to sell only their positions and not open new ones. Both brokerages raised margin requirements on certain securities.

Robinhood told clients in a blog post that it would close out some positions automatically if the client was at risk of not having the necessary collateral. The Menlo-Park, CA based said it plans to allow limited buys of these securities on Friday.

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