Open innovation has received a lot of attention in the business management literature and recently also in policy discussions. Until now, most of the empirical evidence has been based on case study work offering detailed insights into some best practices of open innovation in companies’ innovation strategies. While existing large-scale data may offer interesting empirical evidence on open innovation, they have surprisingly not really been analysed in great detail. Especially the increasing importance of open innovation on a global scale in so-called global innovation networks, calls for internationally comparable data on open innovation. This paper presents different indicators using existing data on R&D investments, innovation survey data, patent data and data on licensing, illustrating the increasing importance and the different characteristics of open innovation across companies, industries and countries.