PetroChina Company Limited is a major state-owned oil and gas corporation in China. It is engaged in the exploration, production, and sales of crude oil and natural gas, as well as refining, chemicals, and marketing.

Petro Gas is a leading company in the field of natural gas and petroleum products, providing a range of services including exploration, extraction, and distribution.

With over 65 years of experience in petroleum products and heating, Léger Énergie is among the leaders in Quebec.

Petróleos Sudamericanos S.A. is an energy company with more than 30 years of experience, developing oil and gas exploration and production activities.

The Petroleum Oil and Gas Corporation of South Africa (PetroSA) is a wholly state-owned company of the Government of South Africa.

PETROSUR is a consulting engineering company specializing in the design and implementation of petroleum, chemical, and gas projects, operating since 1988.

The Engineering Technology Development Center of the China Electromechanical Integration Technology Application Association (referred to as the Engineering Center) is a subordinate department of the association. The Engineering Center aims to wholeheartedly serve China's industry by providing research, plans, and recommendations for government departments in major decision-making processes related to the petroleum, petrochemical, chemical, coal chemical, pharmaceutical, electric power, metallurgy, steel, papermaking, textile, and automotive manufacturing sectors. It utilizes industry resources to organize technical exchanges, training, and establish relevant group standards, offering one-stop, specialized, and customized equipment, electrical, and instrumentation technology solutions for upstream and downstream enterprises in the industry.

Prairie Provident Resources is a Calgary-based company engaged in the exploration and development of oil and natural gas properties in Alberta.

PTT Exploration and Production Public Company Limited (PTTEP) conducts business in petroleum exploration, development and production, renewable energy, new forms of energy, and advanced technology emphasizing greenhouse gas emissions reduction toward the low-carbon and sustainable future.

PTT Public Company Limited is a Thai state-owned oil and gas company. It is involved in the exploration, production, refining, and distribution of oil products, as well as petrochemicals and other related industries.