BRUSSELS: Gimv, a European investment company, has increased its interest in GPNZ (Gesellschaft für Praxisnachfolge in der Zahnmedizin), a fast-growing, high-quality dental platform in Germany, a news release said. In addition to a significant capital increase into the company, Gimv has acquired the shares of co-investors Cannonball and co-founder Marcus Geier. The founder and CEO…