Jo P. van Ham

TBI Holdings BV operates as a financial holding company with activities in the engineering, construction and development, and infrastructure industries. Its subsidiaries include Comfort Partners, Croon Elektrotechniek, Eekels Technology, Era Contour, Groothuis Wonen, Hazenberg Bouw, Hevo, J.P. van Eesteren, Koopmans Bouwgroep, MDB, Mobilis, Nico de Bont, Synchroon, Timmermans Infratechniek, Voorbij Funderingstechniek, Voorbij Prefab, Wolter and Dros, and WTH Vloerverwarming. The company was founded in 1981 and is headquartered in Rotterdam, the Netherlands.

Dura Vermeer Groep NV provides construction and infrastructure development services. The firm also engages in the design and maintenance of land sites, roads, bridge and tunnel structures, railways, underground cables, and pipelines. It serves clients in the housing, government, education, health and welfare, energy and industrial sectors. The company was founded on November 13, 1998 and is headquartered in Rotterdam, the Netherlands.

Deltares operates as an independent institute for applied research in the field of water and subsurface. It works on smart solutions, innovations and applications for people, environment and society. The firm focuses on deltas, coastal regions and river basins. The company was founded in 2008 and is headquartered in Delft, the Netherlands.

Timber & Building Supplies Holland NV operates as a financial holding company that supplies timber products and building materials. The company was founded on August 19, 1918 and is headquartered in Zaandam, the Netherlands.