Ströer

Germany's largest OOH media owner and a top-tier digital publisher, with dominant market share in German DOOH and significant presence in online performance marketing

Ströer SE & Co. KGaA is Germany's leading out-of-home (OOH) and digital media company, operating more than 300,000 advertising touchpoints nationwide. Founded in 1990 and headquartered in Cologne, Ströer has evolved from a traditional billboard operator into a full-stack digital advertising powerhouse, encompassing digital out-of-home (DOOH) screens, high-traffic online content portals, and a sophisticated performance marketing network. The company reaches tens of millions of Germans monthly through properties including t-online.de, one of Germany's most visited news portals, alongside numerous other digital publishing assets. Ströer's AdTech infrastructure includes its own supply-side platform (SSP), a proprietary data management platform, and programmatic DOOH capabilities that allow advertisers to buy inventory across its vast physical and digital network in real time. Its performance marketing division handles lead generation, affiliate marketing, and direct response campaigns at scale, making Ströer a rare integrated media and technology company in the European market. The company has grown significantly through acquisitions, absorbing numerous German digital media and AdTech firms over the years. In the broader AdTech ecosystem, Ströer occupies a uniquely dominant position in the German market, effectively controlling a large share of premium OOH inventory while simultaneously competing with global digital publishers for online advertising budgets. Its ability to offer cross-channel campaigns spanning physical screens, desktop, and mobile — backed by first-party data — gives it a compelling proposition for German and European advertisers seeking brand-safe, GDPR-compliant reach at scale.