Tether, well-known as the issuer of the major stablecoin USDT, is actively expanding its presence in the cryptocurrency mining market. A recent report filed with the U.S. Securities and Exchange Commission (SEC) reveals that Tether has increased its stake in Singapore-based Bitdeer. Currently, Tether owns 21.4% of the miner's shares, achieved through the acquisition of over 1.8 million shares within the last two months.