The set of surveys, conducted in 2013, provides deep insights into small, medium-sized and large enterprises (n=625) in Ukraine. In addition to basic firm characterises such as legal form, ownership, financial indicators and workforce composition, the data sheds light on informality and corruption (various techniques, their frequencies and remedies) inside the companies – information that often remains hidden from the outsider’s perspective. The sample covers companies from the entire country. Some study outcomes suggest a significant heterogeneity in terms of regions.