Jos C. van Winkelen

Douma Staal BV operates as a a trading company in the field of steel, pipes, bright steel, stainless steel and pipe components. Its products include plates, cold-rolled profiles, tubes and round tube, transport, sawing and drilling. The company was founded in 1989 and is headquartered in Sneek, the Netherlands.

Water- en Energiebedrijf Bonaire NV operates as Water treatment plant. The company was founded in 1963 and is headquartered in Kralendijk, Netherlands.

Alliander NV engages electricity and gas networks. It engages in the distribution of energy such as electricity, bio gas, and heat to commercial and residential clients. The firm operates through the following segments: Network Operator Liander and Other. The Network Operator Liander segment provides gas and electricity connections and for distributing gas and electricity in Gelderland and parts of Noord-Holland, Flevoland, Friesland and Zuid-Holland. The Others segment contains activities of Qirion, Stam and Alliander AG, new activities, the corporate staff departments and the service units. It specializes in the management of electricity, gas, and grid-related services. The company was founded in 1994 and is headquartered in Arnhem, the Netherlands.

Vitens NV supplies and delivers drinking water to various domestic and industrial consumers and users. The company was founded in 2006 and is headquartered in Utrecht, the Netherlands.