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. 

According to Nielsen, the Nexium transaction will assist in strengthening the company's ability to service clients when it comes to shopper marketing, in-store retail initiatives, product assortment and space optimization.

This is the first acquisition for Nielsen since it closed a $1.3 billion acquisition of Arbitron Inc., a New York media and marketing research firm, in September. In January, the company sold certain assets related to cross-platform audience measurement services to ComScore Inc.