There are widespread perceptions and countless documented cases of tight-knit networks of politicians and businessmen colluding for allocating public procurement contracts in return for political party donations. In the absence of systematic evidence, neither the magnitude of the problem nor the effectiveness of policies curbing such corruption is well-understood. In order to advance our understanding of these phenomena, this paper tests whether political financing regulations can contribute to controlling corruption in public procurement. We utilize aggregated official micro-level data on almost 3 million contracts awarded across 29 European countries in 2009-2014 to measure the risk of high-level institutionalised corruption using novel proxy indicators. Legislation regulating political finances are directly measured by coding national laws in 2009-2014.