Some of the most active companies traded Friday on the Toronto Stock Exchange:Toronto Stock Exchange (15,454.23, down 0.69 of a point):Bombardier Inc. (TSX:BBD.B). Aerospace, rail equipment. Down 14 cents, or 5.91 per cent, to $2.23 on 9.6 million shares.Pembina Pipeline Corp. (TSX:PPL). Oil and gas. Down 71 cents, or 1.66 per cent, to $42.12 on 5.2 million shares.Cenovus Energy Inc. (TSX:CVE). Oil and gas. Up 24 cents, or 1.93 per cent, to $12.69 on 4.6 million shares.Polaris Materials Corp. (TSX:PLS). Building Materials. Up 84 cents, or 30.43 per cent, to $3.60 on 4.5 million shares.Air Canada (TSX:AC). Airline. Up $1.11, or 4.20 per cent, to $27.51 on 3.8 million shares.ECN Capital Corp. (TSX:ECN). Financial Services. Up 19 cents, or 5.04 per cent, to $3.96 on 3.7 million shares.Companies reporting major news:Restaurant Brands International Inc. (TSX:QSR). Fast food restaurants. Down 22 cents, or 0.27 per cent, to $79.97 on 227,813 shares. A group representing frustrated Tim Hortons franchisees says its board members have been accused by the company of helping leak confidential information. The Great White North Franchisee Association said its board members have been served with notices of default.