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What companies are in the energy sector?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
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The energy sector is one of the smallest stock market sectors, with just 22 companies and about 2.8% of the S&P 500’s weight as of early 2026. IIt focuses on traditional fossil fuels and includes companies involved in energy equipment and services, oil and gas production, refining and marketing, pipelines and transportation, and coal. Major energy stocks include ExxonMobil, Chevron, ConocoPhillips, Phillips 66, Valero, Williams, and Kinder Morgan. Renewable and alternative energy companies are generally classified in other Global Industry Classification System (GICS) sectors.