Some of the most active companies traded Monday on the Toronto Stock Exchange:Toronto Stock Exchange (16,510.82, up 22.70 points).CannTrust Holdings Inc. (TSX:TRST). Health care. Up 64 cents, or 19.16 per cent, to $3.98 on 8.3 million shares.Encana Corp. (TSX:ECA). Energy. Down 34 cents, or 5.21 per cent, to $6.18 on 6.4 million shares.The Toronto-Dominion Bank. (TSX:TD). Financials. Up three cents, or 0.04 per cent, to $76.56 on 4.6 million shares.Aurora Cannabis Inc. (TSX:ACB). Health care. Up 32 cents, or 3.63 per cent, to $9.13 on 4.4 million shares.Birchcliff Energy Ltd. (TSX:BIR). Energy. Up 15 cents, or 5.58 per cent, to $2.84 on 3.3 million shares.Bombardier Inc. (TSX:BBD.B). Industrials. Up one cent, or 0.45 per cent, to $2.21 on 3.2 million shares. The Canadian Press Companies in the news:Cameco Corp. (TSX:CCO). Down $1.13 or 7.8 per cent to $13.33. Uranium producer Cameco Corp.’s shares fell after the company received a smaller sum than it was seeking in an arbitration dispute. Cameco says a tribunal of international arbitrators ruled that a Japanese utility did not have the right to leave a supply agreement and awarded Cameco US$40.3 million, far less than the US$700 million in damages that it was seeking. The utility Tokyo Electric Power Co. said in 2017 that it would terminate a long-term contract because of measures the Japanese government took after the 2011 Fukushima Daiichi nuclear disaster.Stella Jones Inc. (TSX:SJ). Down $2.84 or 6.1 per cent to $44.03. Wood-products producer Stella Jones Inc. says company president and CEO Brian McManus will step down Oct. 11 after 18 years at the company. The Montreal-based company says senior vice-president and chief financial officer Eric Vachon, who’s been with the company for 12 years, will serve as interim CEO until a permanent replacement is found. The company, which did not state a reason for McManus’ departure, reaffirmed its guidance for the year.