Some of the most active companies traded Thursday on the Toronto Stock Exchange:Toronto Stock Exchange (15,776.30, up 55.30 points):Aurora Cannabis Inc. (TSX:ACB). Healthcare. Up 21 cents, 7.24 per cent, to $3.11 on 8.3 million shares.Canopy Growth Corp. (TSX:WEED). Healthcare. Up 80 cents, or 6.74 per cent, to $12.67 on 5.9 million shares.Hydro One Ltd. Instalment Receipts (TSX:H.IR). Utilities. Up 10 cents, or 0.27 per cent, to $37.00 on 4.6 million shares.Manulife Financial Corp. (TSX:MFC). Financial Services. Up nine cents, or 0.36 per cent, to $25.43 on 4.5 million shares.Toronto-Dominion Bank (TSX:TD). Bank. Down 72 cents, or 1.01 per cent, to $70.68 on 3.9 million shares.Teck Resources Ltd. (TSX:TECK.B). Miner. Up $1.18, or 4.26 per cent, to $28.91 on 3.6 million shares.Companies reporting major news:Shopify Inc. (TSX:SHOP). E-Commerce. Down $2.76, or 2.14 per cent, to $126.19 on 1.9 million shares. Stock prices fell for a second day, following a prominent short-seller’s claim that it’s running an overvalued get-rich-quick scheme. The Canadian technology company issued a defence of its business early Thursday but didn’t specifically refer to allegations published by Andrew Left of Citron Research.TransCanada Corp. (TSX:TRP). Oil and gas. Up 66 cents, or 1.08 per cent, to $61.55 on 1.3 million shares. TransCanada has cancelled its $15.7-billion proposed Energy East pipeline, cutting off a potential conduit to bring more western Canadian oil to eastern refineries and overseas export markets. CEO Russ Girling cited non-specific “changed circumstances” for the decision in a brief news release Thursday morning. The Calgary-based company refused to give further explanation. TransCanada said it will record a non-cash charge of about $1 billion in its fourth-quarter financial results, reflecting the reduced carrying value of the projects. It said there would be no costs recovered from third parties.