BUZZ-Bellatrix Exploration Ltd: Seth Klarman takes 11.4 pct stake
** Canadian oil and gas company's U.S.-listed shares up 7 pct at $2.37 premarket
** Prominent hedge fund manager Seth Klarman bought 21.8 mln shares of company, representing a 11.4 pct stake, according to a regulatory filing on Tuesday (1.usa.gov/1ISluIa)
** Klarman is the founder of one of world's biggest hedge funds, Baupost Group
** Up to Tuesday's close, Bellatrix stock had fallen 70 pct this year
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