AYes they do: the Adidas Group (AG) purchased Runtastic in 2015 for a sum believed to be in the region of £150 million. The Adidas Group (AG) is a holding company that operates a range of sportswear companies; such as Reebok and Taylormade. Runtastic was founded in 2009 by Christian Kaar, Florian Gschwandtner, Rene Giretzlehner, and Alfred Luger.
Runtastic is an Austrian company that started by developing fitness apps for mobile phones and mobile devices. The most obvious devices that Runtastic apps run upon are: Android smartphones, the Apple iPhone and the Apple iPad. In 2012, Runtastic began developing it's own mobile hardware: the most popular device that Runtastic has developed is the Orbit fitness tracking device. Adidas has always been at the forefront on sportswear technology - they were the first company to implement a CPU into a sneaker - and it is no surprise that they would want to implement Runtastic's mobile technology into their own products. Adidas is the sole owner of Runtastic; purchasing 100% of it's shares in 2015.