UMX launched an invitation-only beta combining crypto trading with real U.S. stocks, ETFs and options.Users can convert USDT into dollars or borrow against crypto to fund securities purchases directly.UMX says securities positions represent actual shares rather than CFDs or purely price-tracking tokenized products.Stock holdings can be converted into tokens and counted toward crypto account margin requirements directly.Avenir held 18.28 million IBIT shares at March 31, retaining Asia’s largest institutional holder ranking.