is a company in Turkey, operating four refineries with a total capacity to handle an annual 30 mn tons of crude.

Tupras also owns a majority stake (79.98%) in the shipping company DİTAŞ and, since 2006, a 40% ownership of petrol retailer Opet.

In 1983, İPRAŞ and three other publicly owned refineries were brought into state control under the Tüpraş umbrella.

Partial privatisation started in 1991, when an IPO sold 2.5% of shares to the public; by 2005 a number of secondary issues had taken this up to 49%.

In 2005, a consortium of Koç Holding and Shell bid over $4billion to acquire the 51% interest remaining; this was through a new joint venture company, Enerji Yatırımları A.Ş.