Securitize has expanded institutional collateral support for BlackRock’s BUIDL fund across participating crypto prime brokerages, allowing qualified institutional traders to post BUIDL token shares as off-exchange collateral. The move gives tokenized Treasuries a more functional role in trading infrastructure by enabling their use in collateral, financing, margin management and liquidity strategies rather than limiting them to passive holdings. BUIDL remains restricted to qualified institutional users and is not a retail-access product. The development reflects a broader shift toward using tokenized Treasury funds as professional-market collateral, although legal rights, redemption timing, custody, transfer restrictions, smart-contract design and brokerage integration remain important considerations.