Microsoft: Stock Hits Record Close at $543.45, Market Cap Back Above $4 Trillion
Summary
- • Microsoft closed at a record $543.45 on Oct 13, its first record close in nearly a year
- • Market cap reclaimed $4 trillion on Oct 12, first time above that level since October 2025
- • Shares are up over 54% and added about $1.4 trillion since a June 2026 low
- • Microsoft unveiled its third-generation Maia 300 AI chip, with wide deployment starting 2027
Details
Microsoft stock closed at a record high of $543.45 on October 13, 2026
It is the first record close in nearly a year. Shares rose about 0.4% on the day, capping a four-month rally.
Microsoft's market capitalization reclaimed $4 trillion on October 12
It is the first time above that level since October 2025, and the stock held it into the next day's record close.
The stock is up more than 54% and added about $1.4 trillion in value since a June 2026 low
The scale of the rebound shows how far sentiment has swung from the trough earlier this year.
Earlier in 2026 Microsoft lost about $1 trillion in market value at one point
The drop was attributed to investor concern over heavy AI capital spending; the recovery suggests those concerns have eased for now.
Microsoft says it is on pace for $190 billion in capex in calendar 2026
The spending goes to AI infrastructure such as data centers and chips, and is still being sustained despite earlier investor worry.
Microsoft unveiled its third-generation custom AI chip, Maia 300, on October 12
Wide data center deployment is slated to begin in 2027, aimed at reducing reliance on suppliers like Nvidia. Nadella called it the 'biggest bet yet on our own silicon.'
Details compiled via Grok live web research
Figures come from a research digest of Seattle Times, Bloomberg and Barron's coverage, since the original article text was unavailable.
Market Impact = stock movement, Financials = valuation, Stat = figure, Infrastructure = AI buildout, Product Launch = new product, Other = sourcing note
What This Means
Microsoft's stock has recovered from its AI-spending selloff and set a new high, suggesting investors are again willing to back its very large AI investments. The Maia 300 chip shows the company trying to lower dependence on Nvidia while keeping that spending pace. The payoff is still ahead, so the rally rests on expectations.