Some of the most active companies traded Friday on the Toronto Stock Exchange:Toronto Stock Exchange (14,952.33, down 81.31 points):Bombardier Inc. (TSX:BBD.B). Aerospace, rail equipment. Up three cents, or 1.14 per cent, to $2.66 on 6.1 million shares. Brazil says it will ask the World Trade Organization to establish a dispute settlement panel after consultations with Canada failed to resolve its complaint about government subsidies to aircraft manufacturer Bombardier. The South American country said it will ask the WTO to examine more than 20 subsidy programs granted to the Montreal-based company for the development of its CSeries aircraft.Hydro One Ltd. Instalment Receipts (TSX:H.IR). Utilities. Down 15 cents, or 0.41 per cent, to $36.85 on 5.7 million shares.Yamana Gold Inc. (TSX:YRI). Miner. Down 10 cents, or 2.88 per cent, to $3.37 on 5.2 million shares.Encana Corp. (TSX:ECA). Oil and gas. Up five cents, or 0.44 per cent, to $11.54 on 4.3 million shares.Manulife Financial Corp. (TSX:MFC). Financial Services. Down 80 cents, or 3.16 per cent, to $24.50 on 4.1 million shares.Kinross Gold Corp. (TSX:K). Miner. Down 20 cents, or 3.61 per cent, to $5.34 on 3.6 million shares.