Oranje-Nassau Groep B.V. is a principal investment firm focusing on energy and real estate activities including exploration, development, and production of oil and gas and purchase, renovation, development, and management of medium-sized offices and commercial buildings. The company has energy interests in Europe, Africa and the Middle East and real-estate interests in the Netherlands and in Belgium. It also invests through its private equity arm in internationally oriented companies. Oranje-Nassau Groep is based in Amsterdam, Netherlands. Oranje-Nassau Groep B.V. operates as a subsidiary of Wendel.

Oranje -Nassau Participations BV (ONP) focuses primarily on investment situations with larger industrial or service companies arising from a strategy focused on international growth. ONP also participates in transactions where the emphasis is on a restructuring of the shareholder relationships , as in a management buyout financing primarily or in succession . Such investments may be more temporary. However, here is the willingness to lengthy involvement in principle present.