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The Largest Energy Companies by Market Cap in October 2025

Saudi Aramco, ExxonMobil, and Chevron command the energy sector.

By Lyle DalyUpdated May 21, 2025 at 4:00 PM | Fact-checked by Frank Bass

Key Points

  • Saudi Aramco leads as the largest energy company and is the top oil producer in the world.
  • ExxonMobil and Chevron are major U.S. oil producers with significant market presence.
  • Top energy firms are mostly oil-based but are shifting toward renewable investments.

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