This paper presents usage of Supervizor, an online application that provides information on financial transactions of the public sector bodies. Supervizor contains by now 50 mio. transactions from both government and local agencies to government contractors from 2003 to 2014 and matches such transactions to company records from the Business Register including director lists and corporate leadership. The application, which has been designed and developed by the Commission for the Prevention of Corruption, won the UN Public Service Award in 2013, an important recognition of excellence in public service. The data on transactions from Supervizor are also provided in machine readable form.