Some of the most active companies traded Friday on the Toronto Stock Exchange:Toronto Stock Exchange (15,807.17, up 64.97 points):Tethys Petroleum Ltd. (TSX:TPL). Oil and gas. Unchanged at two cents on 10.5 million shares.Eastmain Resources Inc. (TSX:ER). Miner. Up 1.5 cents, or 4.84 per cent, to 32.5 cents on 4.6 million shares.Canopy Growth Corp. (TSX:WEED). Healthcare. Down 20 cents, or 1.53 per cent, to $12.87 on 4.4 million shares.Hydro One Ltd. Instalment Receipts (TSX:H.IR). Utilities. Up 36 cents, or 0.94 per cent, to $38.49 on 3.2 million shares.New Gold Inc. (TSX:NGD). Miner. Down nine cents, or 1.91 per cent, to $4.61 on 3.1 million shares.B2Gold Corp. (TSX:BTO). Miner. Up two cents, or 0.58 per cent, to $3.44 on 2.9 million shares.