Following its acquisition of 52% of NetValue, NetRatings will make a tender offer to buy the remaining outstanding shares.
NetValue provides online audience measurement in Europe, with more than 200,000 panelists in nine countries. Clients include Time Warner AOL Inc., Amazon.com Inc., Terra Networks, France Telecom, Deutsche Telekom and Deutsche Bank.
The acquisition should help efforts to establish global standards for online audience measurement.
In May, NetRatings acquired the AdRelevance Internet ad measurement service from Jupiter Media Metrix Inc. and the eRatings audience measurement service from AC Nielsen.