ST. LOUIS, MO--(Marketwired - Jan 20, 2015) - Leumi Partners Ltd. ("LP"), the investment & merchant banking arm of Bank Leumi le-Israel B.M. ("Leumi"), Israel's first and largest banking group, recently signed an exclusive investment banking collaboration agreement with Stifel, Nicolaus & Company, Incorporated (NYSE: SF) ("Stifel"), one of North America's leading middle-market investment banks.