Microsoft was set for a record one-day jump in its stock market value on July 30, 2026, after giving an upbeat forecast for its cloud business, Azure, alongside its latest earnings report, Reuters reported. A company's "market value" is what all its shares together are worth — think of it as the total price tag the stock market puts on the whole company. The stock gained $65.23, or 16.70%, during the trading day, building on a July 29 closing price of $390.54.

The earnings, released after the market closed on July 29, showed revenue (total sales) of $90.0 billion, up 18% from the same period a year earlier Microsoft Investor Relations. Operating income — profit after paying the costs of running the business, but before taxes and some other items — came in at $40.6 billion, also up 18%. Net income, the bottom-line profit after everything is accounted for, reached $35.8 billion, a 31% increase, with earnings of $4.81 per share Microsoft News. The results were published in a press release and discussed on a call with investors that same evening Microsoft Investor Events.

The day before, trading in options — special contracts that let investors bet on where a stock price is headed — had already signaled a big move was coming. Reuters reported on July 29 that options data pointed to a roughly $190 billion swing in Microsoft's market value after the results Reuters. The actual gain on July 30 appears to have been even larger than that.

This record gain comes exactly six months after Microsoft suffered what was then the second-largest single-day drop in market value for any U.S. stock. On January 29, 2026, the company lost $357 billion in value in one trading day Bloomberg. So the two biggest single-day swings in Microsoft's history happened within the same calendar year.

The broader context here is that several giant technology companies have had massive single-day market-value moves in 2026. Alphabet, Google's parent company, added $421 billion in market value on April 30, 2026, the second-biggest one-day jump on record Bloomberg. In February 2024, Meta Platforms added $204.5 billion in one day, which was the largest such gain for any U.S. company at the time WSJ. Microsoft's July 30 move, if it holds at the record levels Reuters flagged, would top all of these.

Microsoft was not the only giant tech company reporting earnings on the evening of July 29. Meta Platforms, which owns Facebook and Instagram, also reported its Q2 2026 results that night, and the contrast could not be starker CNBC. Meta's earnings per share fell short of what analysts had predicted CNBC, and shares dropped as much as 10% in after-hours trading Fortune. On July 30, Meta stock kept falling BBC.

What weighed on Meta was spending. Total costs jumped 55% from a year earlier in Q2 2026 Fortune. The company had previously raised its 2026 forecast for artificial intelligence spending to between $125 billion and $145 billion, and investors reacted negatively to that heavy commitment Yahoo Finance BBC.

The side-by-side comparison tells you a lot about the current debate over AI spending. Both companies are pouring enormous sums into the technology and the infrastructure behind it. Microsoft's spending is being rewarded by investors because its cloud business, Azure, is growing fast enough to justify it. Meta's spending is being punished because investors cannot yet see enough new revenue coming in to match those costs, and expenses are growing faster than sales. Whether that gap closes in coming quarters is the central question for anyone holding Meta stock. What is known today is that Microsoft's results delivered 18% revenue growth, 18% operating-income growth, and 31% net-income growth all at once, while Meta's costs surged 55%.

What this means for everyday investors is that when a single company can add or lose more than $350 billion in value in one day, the fortunes of a few giant tech firms are driving the overall stock market more than interest rates or economic data. The Microsoft-Meta split on the same evening is a clear example: two huge tech companies, two different AI stories, and completely opposite reactions from investors.