** Canadian smartphone maker’s U.S.-listed shares down 16.2 pct at $10.55 premarket
** BlackBerry says not engaged in discussions with Samsung Electronics Co Ltd with respect to any possible offer to purchase the company
** BlackBerry shares soared nearly 30 pct on Wednesday following a Reuters report that Samsung Electronics offered to buy it for as much as $7.5 bln. The report cited a person familiar with the matter and documents seen by Reuters.
** Samsung tells Reuters in Seoul that it has no plans to acquire BlackBerry
** Up to Wednesday’s close, shares had risen nearly 47 pct in the past 12 months