Microsoft posted a record $450 billion single-day gain in market value after its stock surged 16% on a fiscal fourth-quarter earnings beat, setting the largest one-day market cap increase for any U.S. company in history. The software giant’s shares jumped on July 30 after the company reported earnings per share of $4.81, up 32%, and quarterly revenue of $90 billion, both handily topping Wall Street expectations.
The earnings report was anchored by Azure, Microsoft’s cloud computing division, which crossed $100 billion in annual revenue for the first time in fiscal 2026. Azure revenue grew 43% year-over-year in the quarter, accelerating from 40% growth in the prior quarter and beating analyst expectations of roughly 40%.
Microsoft’s fiscal 2026 full-year revenue reached $331.8 billion, up 18% from the prior year, driven by sustained demand for cloud and artificial intelligence services. The company’s market capitalization rose to approximately $3.35 trillion following the surge, making it the world’s most valuable company by market cap.
The $450 billion gain surpassed the previous single-day record set by Nvidia on April 9, 2025, when the chip maker added $441 billion in market value. That earlier gain had held the record for over a year before Microsoft’s surge displaced it, underscoring the magnitude of investor enthusiasm for the software giant’s cloud and AI prospects.
Microsoft’s shares had traded down nearly 30% from an October 2025 high of $555 in the months leading up to earnings, as investors grappled with concerns about the company’s massive capital spending on AI infrastructure. The earnings beat and upbeat Azure forecast appeared to ease those concerns, with the company reaffirming its capital expenditure guidance for the year.
The company also reported that Microsoft 365 Copilot, its AI assistant suite, had reached over 30 million paid seats, reflecting growing enterprise adoption of AI tools. These figures underscore Microsoft’s success in converting strong demand for cloud and AI services into revenue growth that is outpacing broader market expectations.
Sources
- Wall Street Journal — confirmed $450 billion single-day market cap gain as largest ever for a U.S. company, 16% stock surge, and prior record context
- Reuters — verified $450 billion gain, Nvidia’s previous $441 billion record on April 9, 2025, and market cap of $3.35 trillion
- Bloomberg — reported 16% share surge, $450 billion market value addition, and largest gain since October 2008
- Financial Times — confirmed $450 billion gain displacing Nvidia’s $440 billion April 2025 record
- Microsoft Investor Relations — official earnings data: $4.81 GAAP EPS (up 32%), $4.74 non-GAAP EPS, $90 billion revenue (up 18%), Azure $100 billion annual revenue milestone, 43% Azure growth
- CNBC — reported Q4 earnings details, Azure acceleration to 43%, and analyst expectations
- Fortune — provided context on stock decline from October 2025 high and earnings beat impact
- Redmond Magazine — confirmed Azure $100 billion milestone, 43% cloud growth, and 30 million Microsoft 365 Copilot paid seats
