TORONTO - Some of the most active companies traded Monday on the Toronto Stock Exchange and the TSX Venture Exchange:

Toronto Stock Exchange (12,215.43 down 52.58points):

Talisman Energy Ltd. (TSX:TLM). Oil and gas. Up 22 cents, or 1.59 per cent, at $14.09 on 4,704,138 shares. Industry veteran Hal Kvisle has come out of retirement to take the reins at the oil and gas company. Talisman, which has been dogged by operational issues and repeatedly missed production targets, said it needs a different leadership approach as it shifts strategic direction. Kvisle replaces John Manzoni.

Yellow Media Inc. (TSX:YLO). Directory publisher. Down a penny, or 13.33 per cent, at 6.5 cents on 5,512,263 shares. A majority of its debtholders and shareholders approved Yellow Media’s plan last week to transform itself into a digital company and reduce its $1.8-billion debt.

Eldorado Gold Corp. (TSX:ELD). Miner. Down 52 cents, or 3.62 per cent, at $13.85 on 5,135,141 shares. The gold sector dropped 6.33 points, or 1.93 per cent, to 322.34 points. The December bullion lost US$8.70 to $1,731 an ounce on the New York Mercantile Exchange.

Excellon Resources Inc. (TSX:EXN). Miner. Up nine cents, or 24.66 per cent, at 45.5 cents on 3,484,790 shares. The metals and mining sector dropped 4.27 points, or 0.46 per cent, to 915.06 points.

Lundin Mining Corp. (TSX:LUN). Miner. Down seven cents, or 1.42 per cent, at $4.85 on 3,159,435 shares.

Westaim Corp. (TSX:WED). Investment firm. Unchanged at 77 cents on 3,015,081 shares.

TSX Venture Exchange (1,270.71 down six points):

Zodiac Exploration Inc. (TSXV:ZEX). Oil exploration. Up half a cent, or 9.09 per cent, at six cents on 15,303,500 shares.

Online Energy Inc. (TSXV:ONL). Oil and gas exploration. Unchanged at 33.5 cents on 4,846,900 shares.

Companies reporting major news:

BCE Inc. (TSX:BCE). Communications and media. Up $12, or 0.27 per cent, at $44.26 on 750,217 shares. Canada's biggest communication company said it will launch a TV-and-movie service that will rival Netflix and other big U.S. entertainment providers.

Nordion Inc. (TSX:NDN). Nuclear medicine. Down $3.82, or 36.52 per cent, at $6.64 on 452,474 shares. The Ottawa-based nuclear medicine company's stock price dropped to its lowest level since late 2009 on news it lost a three-year battle with Atomic Energy of Canada Ltd. Nordion suspended its quarterly dividend and announced that it will stop buying back shares on its stock buyback plan.