In 2017, Frankfurt prosecutors, together with federal crime police and tax officials, conducted searches of Commerzbank offices as well as the flats of three suspects in Frankfurt and nearby Hanau.[18] The police raid is about a "tax evasion probe in which several current and former managers are suspected of evading €40 million in taxes via dividend stripping, also known as "cum-ex" transactions".[19] The investigation also extends to trades in 2008 at Dresdner Bank, which was taken over by Commerzbank in 2009.[19] Commerzbank said "it proactively notified the authorities with the preliminary results of that investigation and is cooperating fully".[19]