** B. Riley Financial's shares RILY.O surge nearly 15% premarket
** Beleaguered investment bank RILY gets $160 mln debt facility from Oaktree Capital, uses $118 mln to repay debt to Nomura and rest for working capital
** Stock has been in tailspin since August when it forecast huge losses due to exposure to Vitamin Shoppe-owner
** Stock has plunged 66% since then, despite a recent surge
** Stock regained Nasdaq compliance after filing delayed Q3 earlier this week; prelim FY results due Monday
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com;))