Asset tokenization firm Securitize, in partnership with Mantle, has launched a new institutional crypto index fund, Mantle Index Four (MI4), with Mantle committing $400 million as the fund's anchor investment. MI4 will provide exposure to major crypto assets such as BTC, ETH, SOL, and U.S. dollar stablecoins, with allocations based on market capitalization and risk. Additionally, MI4 surpasses Securitize's previous $148 million BCAP fund, making it the largest tokenized institutional fund.