Some of the most active companies traded Monday on the Toronto Stock Exchange:Toronto Stock Exchange (up 49.27 points to 16,002.78, a record high):Canopy Growth Corp. (TSX:WEED). Health care. Up $2.43, or 19.00 per cent, to $15.22 on 14.7 million shares. Alcoholic beverage company Constellation Brands has signed a deal to acquire a nearly 10 per cent stake in the Canadian marijuana company for $245 million.Precision Drilling Corp. (TSX:PD). Oil and gas. Up 45 cents, or 13.80 per cent, to $3.71 on 5.7 million shares.Aurora Cannabis Inc. (TSX:ACB). Health care. Up 15 cents, or 5.26 per cent, to $3.00 on 5.3 million shares.Crescent Point Energy (TSX:CPG). Oil and gas. Up 68 cents, or 7.18 per cent, to $10.15 on 5.2 million shares.Aphria Inc. (TSX:APH). Health care. Up 54 cents, or 8.00 per cent, to $7.29 on 5.1 million shares.Element Fleet Management Corp. (TSX:EFN). Financial Services. Up 87 cents, or 9.21 per cent, to $10.32 on 5.02 million shares.Companies reporting major news:Cenovus Energy Inc. (TSX:CVE). Oil and gas. Down one cent, or 0.08 per cent, to $12.38 on 4.2 million shares. The company is naming Alex Pourbaix as its new president and chief executive, replacing Brian Ferguson who is retiring after 33 years with Cenovus and its predecessor companies. Pourbaix retired from TransCanada Corp. earlier this year where he was most recently chief operating officer. He starts the new job on Nov. 6 and will also be a member of the Cenovus board of directors.