Circle Internet Group (CRCL), Strategy (MSTR), and Bitmine Immersion Technologies (BMNR) are key stocks to watch in the crypto sector this September. Circle, known for issuing USDC, reported a 53% revenue increase in Q2 2025, despite a recent decline in its stock price. Strategy, the largest corporate holder of Bitcoin, currently holds 636,505 BTC and has seen its stock rise by 17.5% year-to-date. Meanwhile, Bitmine, which focuses on Ethereum, recently acquired 150,000 ETH, aiming to control 5% of the total Ethereum supply. These companies are poised for potential growth amid evolving market conditions.