One of the most important business databases in Bulgaria, the Commercial Register, has finally joined the list of open databases! The published database covers the period between January 2008 and March 2016 and can be downloaded here as a 1.6 GB zip file. Data dictionaries and more information are available here. The data is presented as XML files and contains the changes in company files at the Registry Agency for each day in the period. This opens a lot of exciting opportunities for data mining, for example using graph analysis to find clusters of related companies by common owners, representatives, address. We will keep you posted about any interesting developments.