Tether Overtakes Citigroup with $132.22 Billion Market Cap Tether (USDT), the world’s leading stablecoin, has achieved a monumental milestone in the financial sector. On November 23, 2024, Tether surpassed the global investment banking giant Citigroup, reaching a market cap of $132.22 billion, according to data from 8MarketCap. This development positions Tether as the 142nd largest