Daan Sperling

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.

Part of Stichting TBI, TBI Bouw BV is a Dutch company that provides engineering and construction services. The company is based in Rotterdam, Netherlands.

Part of Stichting TBI, TBI Techniek BV offers real estate, construction and engineering services. The company is based in Rotterdam, Netherlands.

Royal Haskoning DHV provides engineering services. The firm offers acoustics consultancy, engineering, building, architecture, asset management and aviation services. It serves to the aviation, buildings, mining, energy, rural, mining, urban, maritime, water and development markets. The company was founded by Johan van Hasselt, Jacobus de Koning, Adrian Dwars, Arie Heederik and Bastiaan Verhey in 1881 and is headquartered in Amersfoort, the Netherlands.

Royal Boskalis Westminster NV engages in the provision of maritime services. It operates through the following segments: Dredging and Inland Infra, Offshore Energy, and Salvage, Towage, and Holding. The Dredging and Inland Infra segment is involved in all activities required to remove silt, sand, and other layers from the seabed and river bed and in some cases in coastal protection and land reclamation. The Offshore Energy segment focuses on offshore contracting capabilities and services of the group in international energy sector, including oil and gas companies and providers of renewable energy, such as wind power. Salvage, Towage, and Holding segment provides assistance to incoming and outgoing ocean-going vessels through the joint ventures of the group, Keppel Smith, Saam Smit Towage, and Kotug Smit Towage. The company was founded in 1910 and is headquartered in Papendrecht, the Netherlands.

Part of MISTRAS Group, Inc., GMB Holding BV is a Dutch company that specializes in water quality and safety, bio-energy, and construction and infrastructure. The company is based in Opheusden, Netherlands. GMB is committed to promoting safety, a cleaner world, and efficient use of resources and energy. The company strives to make a difference for their clients and society by working closely with their partners and achieving excellent results.

Stadsherstel Historisch Rotterdam NV operates and leases monumental buildings. The private company is based in Rotterdam, Netherlands.