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Ströer SE & Co. KGaA
Ströer sells advertising space on billboards, street furniture, and digital screens, and also runs online marketing and data services.
Ströer is one of Europe's biggest out-of-home advertising companies. It owns or manages the physical spaces where ads appear in public — billboards, the sides of bus stops, digital screens in train stations and shopping streets — and rents those spaces to brands that want to reach people while they are out and about. In Germany in particular, its footprint is huge, and that scale is the core of the business.
The company runs two broad operations. The advertising side sells space on those physical and digital displays. The other side is a collection of online marketing and data businesses: helping advertisers target audiences on the web, measure how campaigns perform, and connect what people see on a billboard with what they do on their phones. That second part matters because it turns a traditional poster business into something more like a modern, data-driven ad platform. Out-of-home advertising has a quiet advantage in the digital age. Unlike a pop-up ad you can skip or block, a big bright screen on a busy street is hard to ignore. As more ad money has moved online — and as privacy rules have made online tracking harder — advertisers have grown more interested in real-world screens that reach lots of people at once. Ströer sits right in the middle of that shift, converting plain billboards into digital displays that can change messages by time of day.
The company is based in Cologne, Germany, and its shares trade on the Frankfurt exchange. It has grown partly by buying up smaller advertising and tech firms to widen its reach and its data tools. The main risks are familiar: ad spending rises and falls with the economy, the business is capital-intensive because screens and sites cost money to build and maintain, and it faces competition from other outdoor advertisers and from the giant online platforms that want the same marketing budgets.
Saved answer · last researched 12 Nov 2026