TORONTO, April 12 (Reuters) - Canada's main stock index ended lower on Wednesday, weighed down by losses among its heavyweight financial and natural resource sectors, while BlackBerry Ltd BB.TO surged after a favorable arbitration ruling.
The Toronto Stock Exchange's S&P/TSX composite index .GSPTSE unofficially closed down 78.71 points, or 0.50 percent, at 15,648.40. Half of its 10 main industry groups fell.