Top Energy Companies in USA List by Market Cap as of August 2026

MPLX owns and operates midstream energy infrastructure and logistics assets, and provides fuels distribution services. MPLX's assets include a network of crude oil and refined product pipelines; an inland marine business; light-product terminals; storage caverns; refinery tanks, docks, loading racks, and associated piping; and crude and light-product marine terminals. The company also owns crude oil and natural gas gathering systems and pipelines as well as natural gas and NGL processing and fractionation facilities in key U.S. supply basins.

ONEOK is Natural Gas Processing, transmission and Distribution ( Gas Utility ) company with headquarters is in Oklahoma, USA.

As on 2022, ONEOK has 2,966 employees.

ONEOK annual revenue generated for period ending Dec-2022 was 22,386 million USD.

ONEOK annual net income generated for period ending Dec-2022 was 1,721 million USD.

Targa Resources is a Midstream Energy Infrastructure company. The company own, operate, acquire, gathering, compressing, treating, processing and selling natural gas. Gathering, storing, terminaling and selling crude oil.
The headquarters is in USA.

As on 2022, Targa Resources has 2,850 employees.

Targa Resources annual revenue generated for period ending Dec-2022 was 20,929 million USD.

Oil and Gas Exploration and Production company with headquarters is in Texas, USA. As on 2018 they had around 11000 employees.

As on 2022, OCCIDENTAL PETROLEUM CORPORATION has 11,973 employees.

OCCIDENTAL PETROLEUM CORPORATION annual revenue generated for period ending Dec-2022 was 36,634 million USD.

OCCIDENTAL PETROLEUM CORPORATION annual net income generated for period ending Dec-2022 was 12,421 million USD.

Diamondback is an independent oil and natural gas company headquartered in Midland, Texas focused on the acquisition, development, exploration and exploitation of unconventional, onshore oil and natural gas reserves in the Permian Basin in West Texas. Diamondback's activities are primarily focused on the horizontal exploitation of multiple intervals within the Wolfcamp, Spraberry, Clearfork, Bone Spring and Cline formations.

As on 2022, DIAMONDBACK ENERGY has 972 employees.

CHENIERE ENERGY is liquefied natural gas company. It owns and operates LNG terminals, and develops, constructs, and operates liquefaction. The company operates through two segments: LNG terminal business, and LNG and natural gas marketing business. The company conducts its business through its subsidiaries, including the development, construction and operation of its LNG terminal business and natural gas marketing business. The headquarters is in USA.

Oil and Gas Exploration and Production company with headquarters is in Oklahoma, USA.

Electric Power Generation and Electricity Distribution (Electric Utility) company with headquarters is in USA.

As on 2022, ENTERGY CORPORATION has 11,707 employees.

ENTERGY CORPORATION annual revenue generated for period ending Dec-2022 was 13,764 million USD.

ENTERGY CORPORATION annual net income generated for period ending Dec-2022 was 1,103 million USD.

Xcel Energy is Electric Utility and Gas Utility company with headquarters is in USA.

PACIFIC GAS & ELECTRIC CORPORATION is Gas utility and electric utility company with headquarters is in California, USA.

As on 2022, PACIFIC GAS & ELECTRIC CORPORATION has 26,000 employees.

PACIFIC GAS & ELECTRIC CORPORATION annual revenue generated for period ending Dec-2022 was 21,680 million USD.

PACIFIC GAS & ELECTRIC CORPORATION annual net income generated for period ending Dec-2022 was 1,800 million USD.