Nielsen Holdings N.V. is an American global information and measurement company with headquarters in New York (USA) and Diemen, the Netherlands. Nielsen is active in over 100 countries and employs approximately 40,000 people worldwide. Total revenues were $6.3 billion in 2014.Company informationNielsen is a leading global information and measurement company that enables companies to understand consumers and consumer behavior. Nielsen measures and monitors what consumers watch (programming, advertising) and what consumers buy (categories, brands, products) on a global and local basis. The company has a presence in approximately 100 countries spread across Africa, Asia, Australia, Europe, Middle East, North America, South America and Russia.David L. Calhoun is Nielsen's Executive Chairman and Mitch Barns is Nielsen's Chief Executive Officer. Prior to joining Nielsen in 2006, Dave Calhoun served as Vice Chairman of The General Electric Company and President and Chief Executive Officer of GE Infrastructure, the largest of six GE business units.While the Nielsen brand is most often associated with television ratings, those TV ratings services comprise approximately one-quarter of the company's business and revenues. After substantial work to simplify the company over the last several years, Nielsen today aligns their business into two divisions: What Consumers Buy and What Consumers WatchWhat consumers buyNielsen's Buy division primarily helps packaged goods companies and retailers understand what consumers are buying in terms of categories, brands and products. For example, it is Nielsen's data that measures how much Diet Coke vs. Diet Pepsi is sold in stores, or how much Crest versus Colgate toothpaste is sold. They accomplish this by purchasing and analyzing huge amounts of retail data that measures what is being sold in the store, and they combine it with household panel data that captures everything that is brought into the home. They also can provide insights into how changes in product offerings, pricing or marketing would change sales. Major clients include The Coca-Cola Company, Nestle S.A., The Procter & Gamble Company, Unilever Group and Walmart.