Based on results of the monitoring of banks' transactions carried out by the National Bank of Ukraine in the interbank foreign exchange market as of September 30, 2014, evidence was revealed that certain banks were engaged in forex rigging practices. These banks (14 financial institutions) were warned about possible suspension from participation in a foreign exchange auction for the sale of foreign exchange at a fixed exchange rate, which had been announced by the National Bank of Ukraine for October 2, 2014. As a result, 4 banks have been suspended from participating in an auction.