Bookmark, which was founded in 1997, is one of the Netherlands' top digital agencies, specialising in eCRM, interactive media and customer loyalty.
The agency, which also offers consultancy, project management and web design and development services, had assets of €1.4m (£950,000) as of December 31.
Nigel Morris, CEO of Isobar, said: "Bookmark brings yet more outstanding talent into the Isobar network. We are building our data and CRM capabilities in many parts of the world and the Bookmark team form an important part of that global strategy.
"The Netherlands is also a very important market in digital and we now have an even stronger position. We have a crystal clear vision of what we want to do, and we're doing it."
Bookmark's current clients include leading domestic and international brands, such as Cadillac, Grolsch, Disney and ABN Amro bank.
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