BUZZ-BlackBerry Ltd: Reverse course after company denies sale talks
** Canadian smartphone maker's U.S.-listed shares down 15 pct at $10.61 in extended trading
** Says late on Wednesday not engaged in discussions with Samsung Electronics Co Ltd with respect to "any possible offer" for the company
** Reuters earlier reported that Samsung recently approached BlackBerry to buy the company for as much as $7.5 bln
** U.S.-listed shares closed up 29.71 pct at $12.59; Toronto-listed shares closed up 15.02 pct at C$29.48
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