Foreign ownership of companies of Canada has long been a controversial political issue in Canada. Concerns regarding foreign ownership generally pertain to ownership of previously 'Canadian' assets by individuals or companies based in countries outside of Canada. The exact definition of "foreign-owned" is the subject of debate. This article uses the working definition for foreign ownership. Some estimates state that more than 50% of the petroleum and gas industry and more than 50% of all manufacturing in Canada is foreign-owned and foreign-controlled.