M. M. Warburg &amp; Co.M. M. Warburg &amp; Co. M. M. Warburg & Co. M.M.Warburg & CO (AG & Co.) KGaA is a German private bank, based in Hamburg. A family-owned bank, it was founded in 1798 by Banca Levi Kahana of Warburg and brothers Moses Marcus Warburg and Gerson Warburg, two members of the Warburg family. The Warburg family still owns the bank, continuing a more than 200-year legacy of private ownership. History. Among many notable Warburg descendants was Siegmund Warburg, who founded S. G. Warburg & Co. in London, in 1946, after fleeing nazi Germany to escape the Nazis. The bank rose to become one of the most powerful  investment banks in the City during the 60s, 70s, and 80s and Warburg himself one of London's most preeminent and influential financiers of the era. The London subsidiary was sold to Swiss Bank Corporation in 1995 and is today a part of UBS. Some descendants immigrated to the United States, for business reasons and to escape the persecution, and established themselves there. They include banker Paul Warburg and his nephew Eric M. Warburg, founder of Warburg Pincus. During recent years, the bank has grown through many acquisitions. It bought several German private banks such as "Marcard, Stein & Co." in  Hamburg, "Carl F. Plump & CO AG" in Bremen, "Bankhaus Hallbaum AG" in Hannover and "Bankhaus Löbbecke" in Berlin. Furthermore, there are the foreign subsidiaries "M. M. Warburg Bank (Switzerland) AG" and "M. M. Warburg & CO Luxembourg S.A.", as well as various mutual funds. Since 2009 the Schwäbische Bank AG in Stuttgart has been part of the Warburg Banking Group. In 2016 the former subsidiary banks Bankhaus Hallbaum, Bankhaus Löbbecke, Bankhaus Carl F. Plump & CO and Schwäbische Bank were amalgamated with M.M.Warburg & CO. The bank's headquarters are located at Ferdinandstraße 75 in Hamburg, with additional offices in Frankfurt, Berlin, Munich  and Cologne. The bank also maintains several offices in Zurich and Luxembourg. Today, M.M.Warburg & CO's core business is in private banking, asset management, and investment banking, serving private, corporate and institutional clients. Cum-Ex scandal. The bank has been implicated in the Cum-Ex scandal, accused of defrauding taxpayers in excess of over 50 million euro. One of the leading players in cum-ex transactions, Hanno Berger, advised M.M.Warburg & CO, or the two main shareholders at the time, the chairman of the supervisory board Christian Olearius and his deputy, Max Warburg, on cum-ex transactions. According to a Spiegel  report published in March 2021, Warburg paid 17.5 million euros to Hanno Berger and Benjamin Frey for advice on cum-ex deals. Warburg wired the money to Sarasin Bank, which routed it to an offshore firm owned by Berger and Frey in the British Virgin Islands. On January 12, 2022, the former managing director of a Warburg subsidiary in Luxembourg surprisingly confessed during a trial before the Bonn Regional Court ('third cum-ex criminal trial'). He is regarded as the Warburg Group's first confessed cum-ex actor. The lawyer Gerhard Strate filed a complaint against Olaf Scholz and Peter  Tschentscher in February 2022. The then mayor and now federal chancellor Scholz and the then finance senator and now mayor Tschentscher are accused of taking 47 million euros from M.M. Warburg & Co. not to have reclaimed. The sum had been reimbursed to the bank by the tax office in connection with cum-ex transactions. Strate accuses the politicians of aiding and abetting tax evasion. M. M. Warburg & Co. M.M.Warburg & CO (AG & Co.) KGaA is a German private bank, based in Hamburg. A family-owned bank, it was founded in 1798 by Banca Levi Kahana of Warburg and brothers Moses Marcus