ST. LOUIS, MO--(Marketwire - Sep 29, 2011) - Stifel Financial Corp. (NYSE: SF) today announced the expansion of its Financial Sponsors Group with the addition of L.J. McKay and Thomas Prior as Managing Directors in the Investment Banking Group. Messrs. McKay and Prior, both of whom are based in New York, join Managing Directors Matthew Allard, Bob Kent, Steven Levy, and Keith Sipes, and report to Co-Heads of Investment Banking Patrick Keeley and Brad Raymond.