Piet Jan Heijboer

NN Equity Investment Fund NV acts as open-end investment fund/unit trust. It invests in relatively undervalued stocks and sectors. The company was founded on November 8, 1960 and is headquartered in Amsterdam, Netherlands.

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.

Synchroon BV engages in developing and realizing residential and retail projects. It focuses on inner city area construction; residential and mixed use buildings; reallocation and transformation of existing real estate; and special residential environments on the outskirts of the urban area. The company was founded in 2008 and is headquartered in Utrecht, Netherlands.

Part of NN Group NV, BeFrank NV is an online pension provider that offers pension schemes for employers with at least 25 employees. Based in Amsterdam, NL, BeFrank allows employers to determine the main aspects of the pension scheme, while employees can choose whether those choices fit their situation. The Dutch company's mission is to bring pensions closer to people. The company offers various investment options, and customers can choose their own risk profile. The CEO of the company is Anne Wilschut. In 2014, BeFrank was acquired by Delta Lloyd Levensverzekering NV for $26.34 million.

De Keizer Marine Engineering BV is an electrical system integrator in the field of super yacht construction. The head office is located in Zaandam, Netherlands, and there are project locations in Makkum, Aalsmeer, Monnickendam, Alblasserdam, Kaag, and Zwijndrecht. The Dutch company realizes projects and carry out maintenance and service work. The private company was declared bankrupt on October 15, 2020, but was relaunched on December 17, 2020, by Eekels, a subsidiary of TBI Holdings. The majority of the employees of De Keizer Marine Engineering kept their jobs after the relaunch. The company was founded in 1965 and has been a family business since then. The CEO of the company is Hendrik de Haan.