The tie-up will extend Adconion's advertising and agency partnerships into central and Eastern European markets, including Switzerland, the Czech Republic, Austria, Poland and Russia.
Through the partnership, Adconion will increase its audience reach by more than 25% to nearly 400 million unique users.
The announcement follows the departure last week of the company's managing director Mike James, who left after three years without a job to go to. He will be replaced in due course.
In the interim, James' responsibilities will be handled by Arndt Groth, the company's president of Europe; commercial director Mark Connolly; vice-president, network operations Veerle de Lombaerde; and global marketing director Joanne Cox.