Most actively traded companies on the TSX

Some of the most active companies traded Wednesday on the Toronto Stock Exchange:

Toronto Stock Exchange (15,524.82, up 78.27 points):

Penn West Petroleum Ltd. (TSX:PWT). Oil and gas. Down $1.37, or 13.78 per cent, to $8.57 on 11.7 million shares. Shares in the company fell sharply Wednesday after it announced it's reviewing its accounting practices going back several years and will have to restate some of its past financial reports.

Athabasca Oil Corp. (TSX:ATH). Oil and gas. Up 26 cents, or 4.37 per cent, to $6.21 on 7.9 million shares

Yamana Gold Inc. (TSX:YRI). Miner. Down six cents, or 0.66 per cent, to $9.08 on 7 million shares.

Bombardier Inc. (TSX:BBD.B). Aerospace. Up seven cents, or 1.94 per cent, to $3.67 on 5.4 million shares

Nuinsco Resources Ltd. (TSX:NWI). Miner. Unchanged at two cents on 5.1 million shares.

Trevali Mining Corp. (TSX:TV). Miner. Up two cents, or 1.52 per cent, to $1.34 on 5 million shares.

Companies reporting major news:

Amaya Gaming Group Inc. (TSX:AYA). Gaming. Down 12 cents, or 0.41 per cent, to $29.49 on 2.2 million shares. The company says its shareholders have approved a financing that's key to its proposed acquisition of the world's largest online poker company, operator of PokerStars and Full Tilt Poker.Amaya said Wednesday it has now obtained all the required shareholder and regulatory approvals and will move to close the deal.

Cenovus Energy Inc. (TSX:CVE). Up 80 cents, or 2.44 per cent, to $33.61 on 3 million shares. The Calgary-based company has appointed a vice president of rail to its leadership team, as the major oilsands producer moves more of its crude by train. The company made its announcement as it posted a more than threefold increase in second-quarter profits and a 33 per cent jump in oilsands production.

CGI Group Inc. (TSX:GIB.A). Information technology. Up 37 cents, or 0.96 per cent, to $38.82 on 1.8 million shares. The company saw its third-quarter net profit jump 26 per cent to $225.1 million, or 71 cents per share diluted. That compares with $178.2 million, or 56 cents per share diluted, in the same quarter of 2013.

Sherritt International Inc. (TSX:S). Miner. Up 25 cents, or 5.73 per cent, to $4.61 on 2.3 million shares. The company reported a loss of $30.1 million in its latest quarter, mainly due to its Ambatovy joint venture nickel and cobalt mine in Madagascar. The loss amounted to 10 cents per share in the quarter. That compared with a loss of $10.7 million, or four cents per share, in the same quarter of 2013.

Torstar Corp. (TSX:TS.B). Publishing. Down 45 cents, or 5.45 per cent, to $7.81 on 264,118 shares. The publisher of the country's largest newspaper, the Toronto Star, reported a slightly higher profit in its latest quarter as it continued to feel pressure from falling print advertising revenues. The media company said Wednesday it had a profit of $19.7 million, up from $18.1 million a year ago, but revenue was lower due to a drop in print ads.