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Can’t confirm first hand but there were definitely reports of TastyWorks halting GME https://www.reddit.com/r/wallstreetbets/comments/l70ysa/tastyworks_has_halt

• calmworm 6y ago
  Thanks for the link. “Halted” doesn’t mean blocked though. Maybe bad wording by the OP on that thread. It was halted multiple times this week throughout each day. Multiple short interest stocks were many times. Looks like it was briefly blocked on TW, though.
• misframer 6y ago
  Here’s the email I got from Tastyworks: > Apex Clearing, who acts as the custodian of all tastyworks accounts, has informed us that the following symbols (AMC, GME, & KOSS) will be set to closing only order status immediately. You will only be able to submit orders to close out any open positions that you have in these symbols. > New opening orders will not be accepted at this time. We will update our clients should the clearing firm lift the Closing Only status in the near future.