Nielsen Holdings NV (NYSE: NLSN), a provider of market research and data, wrapped up the purchase of Nexium for an undisclosed price.

The deal includes all Nexium assets, such as data, intellectual property, analytic tools and a client list that spans 39 countries. The Madrid-based target, which also has offices in Mexico and Brazil, has 150 employees and will be folded into New York-based Nielsen. 

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