We are a company with integrated and specialized operations in the oil, natural gas and energy industry. We are recognized worldwide for our oil and natural gas exploration and production technology in ultra-deep waters. We operate in the transport of oil and gas to our refineries and natural gas treatment units, which must be equipped and in constant evolution to supply the best products.
We have a large base of proven reserves, and we operate and produce most of Brazil's oil and gas, as well as most of the country's refining capacity. We are also involved in the production of petrochemicals through holdings in other companies and are responsible for the largest natural gas-fired thermoelectric plant in Brazil.
As of December 31, 2021, our staff totaled 45,532 employees (parent company and subsidiaries in Brazil and abroad). Our net revenue was BRL 452,668 million in 2021 and our market value was USD 69.2 billion. Our 22 company owned units in Brazil include seven Exploration & Production units and 15 Refining & Natural Gas units.
As of December 31, 2021, we had activities in seven countries, in addition to Brazil. In Latin America, our operations are exploration and production and distribution of oil products. In North America we produce oil and gas through a joint venture. We have subsidiaries in The Netherlands (Rotterdam), USA (Houston) and Singapore that support our commercial and financial activities. These units are responsible for market intelligence and trading of oil, oil products, and natural gas, in addition to storage (tankage) and chartering operations.
We are controlled by the Federal Government, which, on Monday, February 28, 2022, directly held 50.26% of our common shares and 28.67% of our total share capital. The Federal Government also held an indirect interest of 18.48% of our preferred shares; and 7.94% of our total share capital, through the following shareholders: Brazilian National Economic and Social Development Bank (BNDES) and BNDES Participações S.A. (BNDESPAR.) We don't currently have a shareholder agreement.