Microsoft recorded the largest single-day increase in market value ever achieved by a company on Thursday, adding nearly $450bn as investors celebrated accelerating cloud growth and signs that its enormous artificial intelligence investments are beginning to deliver financial returns.
A record-breaking session
Microsoft shares surged 15.5% to close at $451.10, producing the company’s strongest one-day percentage advance since October 2008.
The rally lifted Microsoft’s total market capitalisation to approximately $3.35tn and added about $449.7bn in a single trading session.
That surpassed the previous record set by Nvidia, which gained approximately $441bn in market value on 9 April 2025. Microsoft’s one-day increase was larger than the entire market value of most companies listed on Wall Street.
The scale of the move was particularly striking because Microsoft had underperformed several other members of the so-called Magnificent Seven earlier in the year as investors questioned whether rising expenditure on data centres and AI infrastructure would produce adequate returns.
Azure changes the mood
Those concerns were temporarily swept aside by Microsoft’s fiscal fourth-quarter results.
Revenue increased by 18% to $90bn, while operating income rose by the same percentage to $40.6bn. Net income climbed 31% to $35.8bn on a reported basis, and diluted earnings per share increased 32% to $4.81.
The most important figure for investors came from Azure, Microsoft’s cloud computing platform. Azure and other cloud services revenue grew by 43%, exceeding market expectations of approximately 40%.
Azure’s annual revenue surpassed $100bn for the first time, marking a major milestone for a business that has become central to Microsoft’s position in artificial intelligence.
Total Microsoft Cloud revenue rose 27% to $59.3bn, while the company’s remaining contracted commercial business increased 84% to $678bn. Microsoft also said that its Microsoft 365 Copilot service had passed 30 million paid users.
Stronger growth expected
Microsoft forecast that Azure could grow by approximately 45% in constant currencies during the opening quarter of its new financial year, significantly higher than analysts had expected.
The forecast reassured investors that demand for cloud computing, AI models and data-centre capacity remains strong despite growing concerns that the technology industry is investing too aggressively.
Microsoft spent approximately $41bn on capital projects during the quarter and expects that figure to approach $50bn in the following three months. Much of the money is being directed towards data centres, advanced chips, power infrastructure and the computing capacity needed to operate AI services.
The market’s reaction suggested that investors are prepared to accept exceptionally high expenditure when it is accompanied by strong revenue growth and cash generation.
Microsoft lifts the entire market
The rally spread across Wall Street. The S&P 500 gained 1.66%, the Nasdaq Composite advanced 2.78% and the Dow Jones Industrial Average rose 1.19%.
Microsoft alone contributed an estimated 360 points to the Dow’s 614-point increase. Semiconductor companies also rallied as the results restored confidence in demand for the chips used in AI data centres.
The Philadelphia Semiconductor Index surged more than 8%, while Micron gained approximately 18%, Sandisk rose 26% and AMD advanced around 13%.
A new test for the AI boom
Thursday’s record demonstrated the extraordinary influence that a small number of technology companies now exercise over global stock markets.
It also showed that the AI investment boom is entering a more demanding phase. Investors are no longer rewarding companies simply for announcing larger data-centre budgets. They increasingly expect evidence that those investments are producing revenue, profit and sustainable cash flow.
Microsoft delivered that evidence strongly enough to create almost half a trillion dollars in shareholder value in one day.
The company must now prove that Azure’s acceleration can continue as infrastructure costs rise and competition from Amazon, Google and other AI providers intensifies. For one historic session, however, Wall Street’s doubts were replaced by one of the largest bursts of corporate value creation ever recorded.
Newshub Editorial in North America – 31 July 2026
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