BUZZ-Man Group: Surprise CEO departure hits stock
** Hedge fund Man Group (LSE: EMG.L - news) 's shares down 3.3 pct, largest FTSE mid-250 losers, after saying CEO Manny Roman will join PIMCO as its new CEO on Nov 1
** Co appoints Luke Ellis to succeed Roman as chief executive officer
** Citi analysts say departure is a material event, add some investors may view departure as taking place before his job at Man Group is done
** Shares (Berlin: DI6.BE - news) near the bottom of the Stoxx 600 and worst performers on the Stoxx 600 Financial Services Index (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)