Microsoft stock closes at a record, topping $4 trillion in value after a $1.4 trillion rebound

Microsoft shares closed at a record $543.45 on Tuesday, giving the company a market value just above $4 trillion and capping a gain of about $1.4 trillion since June 25, when the stock closed at $352.83, its lowest in more than a year.

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The rally reverses a rough start to the year. In January, Microsoft lost $357 billion in a single day, the biggest one-day drop in its history, as investors worried about its AI spending and its reliance on OpenAI, and by midsummer it was the worst performer among the so-called Magnificent Seven tech stocks.

The rebound picked up in late July, when Microsoft reported that Azure grew 43% and topped $100 billion in annual revenue, sending the stock up 15.5% the next day. It has mostly kept climbing as the company rolled out a revamped Copilot app, a new AI push for Windows and new AI chips.

The broader market has also been setting records, with the S&P 500 closing above 7,800 for the first time last week. CEO Satya Nadella has been urging businesses to keep control of their own data and avoid tying themselves to a single AI model, a pitch that favours companies like Microsoft that run the cloud and workplace software where that data lives.