Calgary Top Companies List by Market Cap as of August 2026

Oil and Gas company with headquarters is in Canada.

KEYERA provides services to Oil and Gas sector companies to store and transport oil and gas. This company provides essential services to oil and gas producers in the Western Canada Sedimentary Basin, including NGL gathering and processing, fractionation, storage, transportation, logistics and marketing services. They also provide diluent logistics services for oil sands customer. Headquarters is in Canada.

AltaGas, a Canadian corporation, is a North American energy infrastructure business with a focus on owning and operating assets to provide clean and affordable energy to its customers. They had businesses in midstream and natural gas distribution. Headquarters is in Canada.

Canada Based Utility Company with approximately 5,200 employees and assets of $21 billion, is an ATCO Company. Generates Electricity, distributes and transmission of natural gas and electricity is core business.

TransAlta Corporation is a Electrical Power Generation company. It produces wind, hydro-electric power, solar, gas, coal plants, affordable and reliable power. The company operate more than 70 generation facilities across Canada. The headquarters is in Canada.

Baytex Energy Corp is engaged in the acquisition, development and production of crude oil and natural gas company in the Western Canadian Sedimentary Basin and in the Eagle Ford in the United States. The headquarters is in Canada.