Media research and publishing company VNU NV, the Netherlands-based owner of the U.S. Nielsen television ratings, said Monday it had received a buyout offer worth up to $8.87 billion from a group of private equity firms.

The bid was for between $34-$34.60 per share, VNU said.

The consortium of bidders includes AlpInvest Partners, The Blackstone Group, The Carlyle Group, Hellman & Friedman, Kohlberg Kravis Roberts & Co., Permira and Thomas H. Lee Partners.

The company said the bid was nonbinding, but that it was “not continuing discussions with any other party.”