(Bloomberg) -- Microsoft Corp. is on track to record the largest one-day increase in market value for any stock in history. Most Read from BloombergShares of the Redmond, Washington-based company soared as much as 17%, adding $490 billion to its market capitalization as of 12:55 p.m. in New York. The nearly $500 billion jump is larger than the market capitalization of roughly 96% of S&P 500 stocks, data compiled by Bloomberg show. South Africa, Turkey, Finland and Vietnam all have total stock market values that are less than what the software maker is set to add on Thursday. Most Read from Bloomberg Businessweek©2026 Bloomberg L.P.