Teekay Tankers Ltd. engages in the provision of crude oil and refined petroleum products through the operation of its oil and product tankers. It operates through the Tanker and Ship-to-Ship (STS) Transfer segment. The Tanker segment includes the operations of all the tankers, including those employed on full service lightering contracts. The STS Transfer segment offers lightering support services provided to conventional tanker segment as part of the full service lightering operations. The company was founded in October 2007 and is headquartered in Vancouver, Canada.