Twenty One Capital has successfully raised an additional $100 million through convertible senior secured notes, increasing its total funding to $685 million. This latest financing round involved existing investors and sponsors exercising an option to purchase more notes, initially granted during an April funding round, as per SEC filings. The company, launched via a SPAC by Cantor's Brandon Lutnick, counts iFinex and Tether among its notable owners and is led by Strike CEO Jack Mallers.