Klaus Umek agreed to acquire 35% stake in Wiener Privatbank SE (WBAG:WPB) from Günter Kerbler and Johann Kowar in 2012. Klaus Umek signed stock purchase contracts to acquire 35% stake in Wiener Privatbank on April 26, 2013. Günter Kerbler remains a main shareholder with a stake of approximately 25%. Johann Kowar sells his Wiener Privatbank shares of approximately 22% and will continue to participate in the bank as advisor as well as with real estate investment products in the bank. The deal has to be approved by the financial market body.

Klaus Umek cancelled the acquisition of 35% stake in Wiener Privatbank SE (WBAG:WPB) from Günter Kerbler and Johann Kowar on November 27, 2013. The transaction was terminated because the regulatory proceedings were not completed within the contractually agreed deadline.