Saylor's company acquired 4,603 BTC for roughly $370 million, its first disclosed purchase in over two months, ending a stretch in which it had been selling coins to fund preferred stock buybacks and build cash. Bitcoin closed Monday at $78,549, up 1.13%, with September futures settling near $79,040 and no sign of liquidation cascades. Ethereum led the majors at $2,467, Solana reached $103.00 and XRP $1.379.