Huo Xing Finance reports that, on July 31, according to BIT (bit.com) market data, Microsoft rose 15.5% in its closing price on Thursday in U.S. after-hours trading, marking the fourth-largest single-day gain in the company’s history and the largest single-day market capitalization increase ever recorded for a U.S. stock. Investors welcomed the strong earnings report, which reversed the recent market pessimism surrounding AI-related companies. The stock’s year-to-date decline narrowed from approximately 19.3% at Wednesday’s close to 5.8%. Data analysis shows that this rally added $450 billion to Microsoft’s market capitalization, surpassing NVIDIA’s $440 billion single-day gain on April 9, 2025, to become the largest single-day market cap increase in U.S. stock history.
Microsoft's market cap surges $450 billion in a single day, setting a historical record.
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Summary
Microsoft's market sentiment reached a high as its stock surged 15.5% on July 31, adding $450 billion to its valuation. This jump marked the largest single-day market cap increase in U.S. history, surpassing NVIDIA’s previous record. Strong earnings boosted investor confidence, lifting Microsoft even as broader AI-linked stocks declined. The company closed at a new peak, reflecting renewed confidence in its growth prospects.
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