According to the European Commission estimations, over 250 000 public authorities in the EU spend around €2 trillion per year (14% of EU GDP) through public procurement for services, works and supplies. Construction, Wholesale of fuels and Wholesale of pharmaceutical products have been identified as one of the most risky sectors in terms of possible misuse and mismanagement of public spending. Risks assessment of the above three sectors in Bulgaria, Italy, Romania and Spain, based on big-data analytics of integrated procurement and company data, shows that public procurement in Bulgaria and Romania is more vulnerable to suspicious behaviour – both on the side of suppliers (companies) and buyers (contracting authorities). Assessment is done on the basis of combination of “red flags”, each of them indicating a risk situation, which might be result of corruption or conflict of interests. Single “red flag” is not a compulsory sign of suspicious behaviour but the accumulation of red flags for a particular company, contracting authority, sector or country indicates serious concerns about existing problems in the procurement processes respectively on micro (single entity) or macro (sector, country) level.