Strategy (formerly MicroStrategy) said Monday that it quietly added another 850 BTC to its mammoth corporate stash, the latest chapter in Michael Saylor’s long-running experiment of turning a software company into the world’s biggest Bitcoin treasury. In a post on X, Saylor wrote that “Strategy has acquired 850 BTC for ~$99.7 million at ~$117,344 per Bitcoin and has achieved BTC Yield of 26.0% YTD 2025,” and noted that, as of September 21, 2025, the company holds 639,835 BTC purchased for roughly $47.33 billion at an average cost of about $73,971 per coin.