Frank Monstrey

Nostrum Oil & Gas LP is an exploration company. The firm engages in the exploration, production and sale of oil and gas. Its products include crude oil, stabilized condensate, Liquefied Petroleum Gas and dry gas. The company was founded in 1997 and is headquartered in Amsterdam, the Netherlands.

Ruspetro Ltd. operates as an Independent oil and gas development and production company, with assets in the Western Siberia region of the Russian Federation. It holds three licenses for exploration for and extraction of crude oil and natural gas in the Khanty-Mansiysk region of the Russian Federation. The company was founded on October 20, 2011 and is headquartered in Moscow, Russia.

Ex'tent BV (Ex'tent) is the venture capital subsidiary of Extent Holding BV, itself a subsidiary of Wintzen Management Co. BV in the Netherlands. Founded by Dutch IT entrepreneur Eckart Wintzen in 1996, the name of the firm derives from 'Eck's shack'. Ex'tent is located in Austerlitz in the province of Utrecht in the central Netherlands. The firm aspires to sway the correlation between the growing wealth of the western world and the depletion of natural resources worldwide, the impoverishment of poor populations and the global environmental crisis. A self-described 'company with a conscience', Ex'tent aims to contribute to orienting the western free-market economy towards increased global fairness and environmental sustainability. The firm supports both commercial enterprises and non-profit organizations in which Ex'tent is not a shareholder. Ex'tent operates in close relationship with Probel Capital Management NV, a Belgian corporate finance advisory and venture capital partnership, as well as with Probel's wholly-owned subsidiary Bosschuur Capital Management BV. Boschuur manages the green venture capital fund Ex'tent BV and shares premises with Ex'tent.

Part of Thyler Holdings Ltd., Claremont Holdings Ltd. is a British company that provides investment services. The company is based in London, UK.

Nostrum Services NV operates as an investment advisory and private equity management firm. The firm advises corporate clients on direct investments. The company was founded by Frank Monstrey in 1991 and is headquartered in Brussels, Belgium.

Nostrum Oil & Gas Group Ltd. produces, develops and explores oil and gas. The company is headquartered in Douglas, the United Kingdom.