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American Water Works is the largest investor-owned US water and wastewater utility, serving nearly 4 million customers in 14 states. It provides water and wastewater services to residential, commercial, and industrial customers and operates predominantly in regulated markets. The company's nonregulated business is water services for military bases, which operates under long-term contracts with regulated-like returns. The proposed Essential Utilities acquisition would add regulated water and wastewater utilities in Ohio, North Carolina, and Texas while increasing its presence in Illinois, Indiana, Pennsylvania, New Jersey, and Virginia.

CenterPoint Energy owns a portfolio of businesses. Its regulated electric utilities provide transmission and distribution services to more than 2.5 million customers in the Houston area, southern Indiana, and west central Ohio.

Edison International is the parent company of Southern California Edison, an electric utility that distributes electricity to 5 million customers in a 50,000-square-mile area of Southern California, excluding Los Angeles. Edison Energy owns interests in nonutility businesses that deal in energy-related products and services. In 2014, Edison International sold its wholesale power generation subsidiary Edison Mission Energy out of bankruptcy to NRG Energy.

New Jersey Resources is an energy infrastructure company that provides retail and wholesale energy services to customers in New Jersey and other states, from the Gulf Coast to New England, as well as in Canada. The company is located in Wall, New Jersey, and has about 1,400 employees.