Philip Alberdingk Thijm

Keesing Group BV provides publishing services. It offers puzzle magazines in the Netherlands, France, Belgium, Denmark, Germany, Spain, Italy, Sweden, Norway, Hungary, and the United Kingdom. The firm's brands include Denksport, Sport Cérébral, Tankesport, Megastar, Jan Meulendijks, 10 voor Taal, and Win. The company was founded by Isaäc Keesing in 1911 and is headquartered in Amsterdam, the Netherlands.

Eye To Eye Puzzles Ltd. provides puzzle magazine portfolio. It supplies tailored puzzles to third parties for use in their marketing, sales promotion, editorial and advertising activities. The company was incorporated on October 17, 2009 and is headquartered in London, the United Kingdom.

Keesing France SA publishes puzzle magazines. The company is headquartered in Levallois-Perret, France.

Sky Radio BV operates an online radio station. The company is headquartered in Hilversum, Netherlands.

PCM Uitgevers BV provides publishing services. It publishes daily newspapers, educational publications including dictionaries, general fiction, fantasy, Dutch language software for children & adults, travel guides and trade books. The firm operates business through its subsidiaries. The company was founded in December 1995 and is headquartered in Amsterdam, the Netherlands.

Foreign Media BV is a holding publishing group operating in various media fields. It focuses in a range of media products including reading, watching, gaming and listening, in all genres, from classical to contemporary and aimed at both children and adults. The company is headquartered in Leeuwarden, the Netherlands

FD Mediagroep BV provides news and media services. It offers information in the financial-economic sector through print, radio, online materials and events. The firm also provides media and marketing solutions. The company was founded in 1997 and is headquartered in Amsterdam, the Netherlands.