Bitcoin rallied to $78,000 on Friday, lifting MicroStrategy (NASDAQ: MSTR) stock 9% to above $180 per share. The stock surge reflects investor appetite for Bitcoin proxy plays when spot prices climb. MicroStrategy holds one of the largest corporate Bitcoin treasuries in the world. Executive Chairman Michael Saylor fueled momentum days earlier with a keynote at Bitcoin 2026 in Las Vegas. The company has aggressively accumulated BTC through equity offerings and debt issuance, betting that Bitcoin appreciation will compound shareholder returns. This strategy ties MSTR performance directly to Bitcoin price action. Investors treat the stock as leveraged Bitcoin exposure with corporate governance overhead. The $78,000 level represents a recovery from recent weakness. MicroStrategy trades at a premium to net asset value when Bitcoin rallies hard, as fund flows into the stock amplify spot price gains. The stock remains volatile relative to Bitcoin itself.