Microsoft Stock Surges 17%, Adds $480 Billion Market Value

Microsoft's stock price surged by as much as 17% on Thursday, reaching over $455 and marking the largest single-day gain for the company in nearly two decades. This significant increase followed the release of the tech giant's fourth-quarter results for the 2026 fiscal year on Wednesday, which appear to have reassured investors about the efficacy of CEO Satya Nadella and CFO Amy Hood's strategy. This strategy aims to convert an estimated $190 billion in AI spending for the current year into substantial revenue growth. Prior to these results, Microsoft's stock had experienced a decline of nearly 30% from its October 2025 high of $555. This downturn was attributed to investor concerns regarding the long-term returns on massive investments in AI infrastructure, with total expected spending across hyperscalers and cloud providers now projected to exceed $850 billion. The stock had closed at $390.54 on Wednesday before its Thursday rally, which saw it briefly touch $456 in afternoon trading, thereby adding approximately $483 billion in market value within a single day. According to Jefferies, Thursday's rally represents the most substantial one-day increase since 2008, when Microsoft's stock saw a 19% rise. The positive market reaction was driven by Microsoft's fourth-quarter and fiscal year-end financial results, which surpassed analyst expectations across nearly all key metrics. Furthermore, the company provided stronger-than-anticipated forward guidance, delivered by CFO Amy Hood during the earnings call. Quarterly revenue reached $90 billion, exceeding the analyst consensus of $87.6 billion by approximately $2.4 billion, and representing a year-over-year increase of $13.6 billion, or 17.7%. Earnings per share were reported at $4.74, surpassing the consensus estimate of $4.24, contributing to a total quarterly net income of $35.8 billion. Microsoft's cloud computing service, Azure, was highlighted as a central focus, with Nadella presenting an annual overview of the company's cloud strategy. The strong performance indicates that the substantial investments made in AI infrastructure and cloud services are beginning to translate into tangible financial gains, alleviating previous investor anxieties about the profitability of these large-scale technology buildouts.