2. Chevron: Chevron is another major player in the natural gas industry. They have extensive natural gas operations, from exploration and production to the distribution of natural gas products, including liquefied natural gas (LNG).
3. ConocoPhillips: ConocoPhillips is a prominent American energy company with substantial natural gas assets. They engage in natural gas exploration, production, and transportation, contributing to the nation's energy supply.
4. EOG Resources: EOG Resources is known for its focus on shale gas production. They have played a significant role in the shale revolution, particularly in regions like the Permian Basin and Eagle Ford.
5. Kinder Morgan: Kinder Morgan is a major natural gas pipeline and infrastructure company in the U.S. They are essential for transporting natural gas from production areas to end-users, facilitating the distribution of this energy source.
Please note that the rankings and companies in the natural gas industry may have changed since then, so it's a good idea to verify the current status from a reliable and up-to-date source.