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The Largest Stock Market Companies in 2026

By Matthew Frankel, CFPUpdated Mar 17, 2026 at 1:33 PM EST | Fact-checked by Robin Hartill, CFP

Key Points

  • Over 12,000 stocks trade in the U.S., but only 2,500 have a market cap over $1 billion.
  • Nvidia leads as the largest Nasdaq company with a $4.5 trillion market cap by 2026.
  • Private firms like Cargill and Koch Industries focus on diverse sectors, remaining unlisted.

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