What are some major corporations in Texas?

* Exxon Mobil: One of the world's largest oil and gas companies, Exxon Mobil is headquartered in Irving, Texas.

* AT&T: A leading telecommunications company, AT&T is headquartered in Dallas, Texas.

* Valero Energy: One of the world's largest independent oil refiners, Valero Energy is headquartered in San Antonio, Texas.

* Occidental Petroleum: An international oil and gas exploration and production company, Occidental Petroleum is headquartered in Houston, Texas.

* Phillips 66: A diversified energy company, Phillips 66 is headquartered in Houston, Texas.

* ConocoPhillips: A global energy company, ConocoPhillips is headquartered in Houston, Texas.

* Chevron: One of the world's largest oil and gas companies, Chevron is headquartered in San Ramon, California, but has a major presence in Houston, Texas.

* Enterprise Products Partners: A midstream energy company, Enterprise Products Partners is headquartered in Houston, Texas.

* H-E-B Grocery: A regional supermarket chain, H-E-B Grocery is headquartered in San Antonio, Texas.

* Whataburger: A regional fast-food chain, Whataburger is headquartered in San Antonio, Texas.