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

Toronto Stock Exchange (11,582.21 down 256.08 points):

Banro Corp. (TSX:BAA). Miner. Down eight cents, or 4.21 per cent, at $1.82 on 13,294,208 shares. The metals and mining sector led the decliners on the main index, dropping 4.41 per cent.

Manulife Financial Corp. (TSX:MFC). Insurer. Down 60 cents, or 4.28 per cent, at $13.41 on 10,446,995 shares. Canada's largest insurer's saw its stock close at its lowest level since March 2009 a day after credit rating agency DBRS downgraded it to AA (low) from AA. Manulife reported "extremely disappointing" second-quarter results last week.

OPTI Canada Inc. (TSX:OPC). Oilsands. Down 26 cents, or 18.31 per cent, at $1.16 on 5,883,142 shares. The oilsands junior announced it will raise US$400 million in debt to get it through the ramp up of its Long Lake project and an ongoing strategic review. Its shares settled at a 17-month low.

Suncor Energy Inc. (TSX:SU). Oilsands. Down $1.39, or four per cent, at $33.34 on 5,783,858 shares. The energy sector dropped 2.84 per cent on the TSX, as the price of oil on the New York Mercantile Exchange dropped $2.23 to US$78.02 a barrel.

Canadian Natural Resources Ltd. (TSX:CNQ). Oil and gas. Down $1.42, or 3.93 per cent, at $34.71 on 4,906,375 shares.

Timminco Ltd. (TSX:TIM). Metals producer. Up seven cents, or 12.28 per cent, at 64 cents on 4,840,180 shares. The company narrowed its second-quarter loss to $9.7 million from $24 million a year ago as sales roared back to life following a dismal 2009.

TSX Venture Exchange (1,464.15 down 4.88 points):

Petrodorado Energy Ltd. (TSXV:PDQ). Oil and gas. Down 1.5 cents, or 4.41 per cent, at 32.5 cents on 5,958,528 shares.

Centric Energy Corp. (TSXV:CTE). Junior natural resource. Up a penny, or 4.55 per cent, at 23 cents on 2,136,000 shares.

Companies reporting major news:

CAE (TSX:CAE). Flight simulators. Down 10 cents, or 0.99 per cent, at $9.96 on 598,963 shares. The Montreal-based company earned $39.4 million in its fiscal 2011 first quarter, up from profits of $27.2 million in the comparable 2010 period, but revenue dropped four per cent to $366.7 million. CAE also announced it would increase its quarterly dividend to four cents per share from three cents.

Iamgold (TSX:IMG). Miner. Down 46 cents, or 2.48 per cent, at $18.08 on 3,476,495 shares. The mid-tier gold miner posted a 19 per cent decline in second-quarter profits to US$35.7 million while revenue was down to $214 million from $225.3 million.

Metro Inc. (TSX:MRU.A). Grocer. Down 46 cents, or 1.05 per cent, at $43.35 on 307,588 shares. The supermarket chain's net quarterly earnings increased 6.6 per cent to $120 million while sales inched up to $3.56 billion from $3.51 billion. Same-store sales were down 0.6 per cent.

Rona Inc. (TSX:RON). Hardware retailer. Down 80 cents, or 5.61 per cent, at $13.45 on 4,324,388 shares. Its second-quarter profits increased to $67.8 million from $60.8 million while sales rose 2.1 per cent. Rona's president and chief executive offered a cautious outlook for the coming months.