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The Largest Companies by Market Cap in January 2026

Nvidia, Apple, and Alphabet are the biggest companies by market cap.

By Lyle DalyUpdated Jan 5, 2026 at 10:19 AM EST | Fact-checked by Parker Hicks
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Key Points

  • Nvidia leads as the most valuable company globally with a $4.5 trillion market cap.
  • Tech firms dominate, but sectors like oil and finance also feature in the top market caps.
  • 12 companies boast market caps over $1 trillion, reflecting significant investor trust.
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