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Amazon and Microsoft added close to $445 billion in combined market value in a single morning on November 4, 2026.
The move came the day after the US midterm elections, in which Democrats won control of both the House and the Senate. Investors appear to have looked at the results and decided the two cloud giants were among the winners.
The numbers behind the morning
Amazon shares climbed between approximately 7% and 7.7% during the session. Microsoft rose by about 5% to 7%.
Both stocks traded near intraday records.
Microsoft accounted for the larger share of the gain, adding around $250 billion in market value on its own. The rest of the near-$445 billion total came from Amazon.
For context, Microsoft has been here before, and recently. In late July 2026, the company posted a record $450 billion market-cap increase after a strong earnings report.
Politics meets the data center
The election results went beyond Congress. Democrats also won key gubernatorial races in Texas, Ohio, and Georgia.
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Meanwhile, local voters in several states approved restrictions on building new data centers.
The expectation embedded in the rally is that a Democratic-controlled Congress could introduce regulatory measures favoring large tech companies that already operate extensive data-center networks.
The cloud tailwind was already blowing
Both companies came into November off strong earnings tied to cloud computing. Amazon Web Services, the company’s cloud division, grew by 39%. Microsoft said it anticipated growth in Azure, its own cloud platform, exceeding 45% for the next quarter.
Both companies have responded by spending heavily. Amazon raised its 2026 capital expenditure forecast to $220 billion.
What this means for investors and the tech landscape
Investors watching these names have a few clear things to track. The first is whether Microsoft actually delivers Azure growth above 45% in the coming quarter, as it anticipated.
The second is how the data-center restrictions approved by voters are implemented at the state and local level.
The third is whether the new Congress moves toward the kind of regulatory framework the market seems to be betting on.
Finally, there is the spending. Amazon’s capex plans reflect a belief that AI-driven cloud demand will keep accelerating.
