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BUZZ-IWG: top of FTSE 250 as Prime Opportunities mulls another bid

** British serviced office provider's shares up 2.4 pct, top riser on FTSE 250 in decent volume

** Prime Opportunities Investment Group said IWG (LSE: IWG.L - news) had rejected its offer approach and that it was considering making another offer

** Co is the fourth bidder for IWG which has also received takeover approaches from U.S. property investment firm Starwood Capital (Other OTC: CGHC - news) , British private equity fund TDR Capital and American buyout house Lone Star

** Stock has fallen 6.3 pct in the last twelve months