CIECO UK is a London based oil and gas E&P group company established in 2018 and is a subsidiary of ITOCHU Corporation (ITOCHU).

ITOCHU is foundation in 1856, has been one of the largest international trading conglomerates headquartered in Tokyo and Osaka, having approximately 110 bases in more than 60 countries with over 100,000 group employees. As an integrated cross-industry company, ITOCHU is not only engaged in the E&P sector, but also synergies with other businesses i.e. trading/crude marketing, plant and pipeline business. ITOCHU is also participating in the ACG and BTC Pipeline Project in Azerbaijan, Sakhalin 1 Project in East Siberia, the West Qurna 1 Project in Iraq, Ras Laffan LNG Project in Qatar, the Qalhat LNG project in Oman and the Oman LNG project through an equity share holding. ITOCHU is also a LNG off-taker for the Oman LNG project. ITOCHU also has a crude oil trading hub in Singapore.

CIECO UK acts as the base office for ITOCHU's oil and gas E&P business, covering activities in the UKCS, Europe, Africa, Middle East and CIS. Currently, ITOCHU's worldwide net production has been approximately 36,000 boepd and ITOCHU is seeking to increase its net production by acquiring quality assets as well as excellent companies.

CIECO is a U.K. multinational energy corporation, it is headquartered in London, and active in more than 180 countries. CIECO is engaged in every aspect of the oil and natural gas industries, including hydrocarbon exploration and production; refining, marketing and transport; and power generation.
CIECO is one of the largest companies in the world and the sixth largest oil company in the United Kingdom.