BlockFi is one of them. They believed they were holding the Robinhood shares as collateral pledged for a large loan to Alameda Research. But when they went to l

BlockFi is one of them. They believed they were holding the Robinhood shares as collateral pledged for a large loan to Alameda Research. But when they went to liquidate the shares after the loan defaulted, the broker did not allow them to do so, as FTX/Alameda had just filed for bankruptcy and I believe the estate argued against it. See https://www.reuters.com/legal/ftx-opposes-blockfis-claim-bankman-frieds-robinhood-shares-2022-12-22/ https://www.reuters.com/legal/ftx-opposes-blockfis-claim-ban... I am not sure who the 4th party is.