The story
Adtech was founded in 1998 in Frankfurt, Germany, by Michael Stusch and Michael Schultheiß. In 2000, the American Internet holding company CMGI acquired a controlling interest (80%) in Adtech. During the same year, Adtech became a private limited company.
Based on AdForce Inc.’s technology, Adtech opened its first data center in Frankfurt (Germany) in 1998. By 2001, Adtech had delivered its ten billionth banner ad. In 2002 Adtech supplied its 100,000th advertising campaign and delivered more than 100 million banners every day. In 2004, the AdForce technology was replaced by Adtech's own ad serving technology. Shortly after, the second ad serving data center was launched in Frankfurt.
On May 16, 2007, AOL announced its acquisition of Adtech AG. Adtech was acquired to provide AOL with an ad serving platform enabling website publishers to manage, traffic and report on their online advertising campaigns. After operating as an independent and wholly owned subsidiary of AOL's Advertising.com division, as the ad-serving platform for AOL Advertising (previously Platform-A), the company as of November 2018 is part of Oath Inc., owned by Verizon Communications.
From Wikipedia’s article on Adtech, shared under CC BY-SA 4.0.3