Microsoft’s $450 Billion Jump Is Biggest in Stock Market …

Microsoft Corp. made market history by adding approximately $450 billion to its market capitalization in one day, following a 16% surge in its stock price—its largest gain since October 2008. This performance surpassed Nvidia Corp.’s previous record of $440 billion, marking the biggest single-day gain for any stock. The surge occurred on July 30, 2026.

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A Microsoft store in New York. Photographer: Adam Gray/Bloomberg

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By Subrat Patnaik

July 30, 2026 at 12:55 PM EDT

Updated on July 30, 2026 at 4:08 PM EDT

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Microsoft Corp. made market history on Thursday, adding nearly half a trillion dollars to its value, the most by any stock in a single day.

Shares of the Redmond, Washington-based company soared 16%, their biggest gain since October 2008, to add roughly $450 billion to its market capitalization. The move eclipses Nvidia Corp.’s $440 billion addition, following President Donald Trump’s announcement of a 90-day tariff pause last year, as the biggest ever, according to data compiled by Bloomberg.

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Microsoft’s $450 Billion Jump Is Biggest in Stock Market History