Christiaan Hendrik de Ruyter van Steveninick

Part of Capricorn Energy Plc, Capricorn Oil & Gas Ltd. is a British company that provides oil and gas exploration services. The company is based in Edinburgh, UK.

SHV Energy Holdings UK Ltd. operates as fuel dealers. The company is headquartered in Warwick, GB.

One-Dyas BV engages in the exploration and production of oil and gas. The firm focuses primarily on developing and exploiting gas fields in the North Sea. The company is headquartered in Amsterdam, the Netherlands.

Discover Exploration Ltd. operates as an oil and gas exploration and production company. It has assets in Europe, Africa, and Australasia. The company was founded by Michael Henry Nolan, John Edward Craven, Frantisek Michael Josef Blaha, Paul Michael Griggs, and Alexander Mollinger in 2012 and is headquartered in London, the United Kingdom.

Delta Hydrocarbons BV invests in field development and production enhancement of oil and gas assets. It engages in exploration and production of oil and gas reserves for oil companies. The firm offers deal structuring, field development and operations, financial and commercial management services. The company was founded by Walter van de Vijver and Maarten Reinder Scholten in 2004 and is headquartered in Utrecht, the Netherlands.

Part of SHV Holdings NV, One-Dyas Petroleum Ltd. is a British company that engages in the extraction of oil and natural gas. The company is based in London, UK. Founded in 2014.

One-Dyas UK Ltd. engages in the exploration for oil and natural gas. The company is headquartered in Westhill, the United Kingdom.

Part of SHV Holdings NV, Dyon E & P Ltd. is a holding British company that operates subsidiaries engaged in the exploration of oil and gas. The company is based in London, UK. Dyon E&P Ltd. was founded in 2005.

Part of SHV Holdings NV, One-Dyas Mariner Ltd. is a British company that explores oil and gas. The company is based in Edinburgh, UK. Founded in 2013.