J. J.J. Mulder

Houdstermaatschappij Dekker BV is a family-owned business that has been active for over 100 years in winning sand, gravel, and clay for construction, landscape development, logistics, land for redesign, and concrete. The private company is based in IJzendoorn, Netherlands. The Dutch company's core business is nature-inclusive and sustainable sand and gravel extraction along the rivers, transforming agricultural floodplains into water-rich nature with opportunities for biodiversity, high water safety, energy transition, and recreation.

Dekker Groep BV operates as a financial holding company with activities in the countertop market. The company was founded by Gijsbert Dekker in 1930 and is headquartered in Zevenhuizen, the Netherlands.

Part of Ampelmann Operations BV, Ampelmann Netherlands BV functions as an investment holding Dutch company. The company is based in Delft, 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.

Boskalis Nederland BV provides dredging and maritime services. The company is headquartered in Rotterdam, the Netherlands.

IHC Merwede Holding BV engages in the development of design and construction activities for the specialist maritime sector. It constructs dredging and mining vessels and equipment. The firm is a supplier of innovative ships and supplies for offshore construction. The company’s broad customer base includes dredging operators, oil and gas corporations, offshore contractors and government authorities. The company was founded in 1902 and is headquartered in Sliedrecht, 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.