BUZZ-Concordia Healthcare: Blackstone mulling buyout - Bloomberg
** Canadian drug developer's stock up 25.2 pct at C$38.65 in afternoon trading
** U.S.-listed shares halted for news pending; were last up 25 pct at $30.50
** Blackstone Group said to be in takeover talks with company, Bloomberg reports, citing people familiar with the matter
** Talks at an early stage and deal may not happen, Bloomberg reports
** More than 2 mln U.S. shares traded until 10:52 a.m. ET, 8.6x 25-day moving avg volume
** Up to Wednesday's close, U.S. stock had fallen 68 pct in 12 months
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