BUZZ-Tekmira Pharmaceuticals Corp: Files for common stock offering
** Canadian drugmaker's U.S.-listed shares down 3.9 pct at $15.50 premarket
** Company files for offering of shares worth up to $150 mln
** Tekmira had 22.3 mln shares outstanding as of Oct. 30, according to Thomson Reuters data
** Up to Wednesday's close, stock had fallen nearly 49 pct from its year-high of $31.48 hit on March 13
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