09/11/2013 05:30 EDT | Updated 11/11/2013 05:12 EST

Most actively traded companies on the TSX, TSX Venture Exchange markets

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

Toronto Stock Exchange (12,806.47 down 120.31 points):

Osisko Mining Corp. (TSX:OSK). Miner. Down 15 cents, or 2.70 per cent, at $5.41 on 32.19 million shares. The gold sector led the subgroups, sliding 5.45 per cent as the price of bullion fell $36.80 to US$1,332.50 an ounce on the New York Mercantile Exchange.

Iamgold Corp. (TSX:IMG). Miner. Down 69 cents, or 11.69 per cent, at $5.21 on 23.55 million shares.

Alacer Gold Corp. (TSX:ASR). Miner. Down 26 cents, or 7.41 per cent, at $3.25 on 20.59 million shares.

Semafo Inc. (TSX:SMF). Miner. Down nine cents, or 3.69 per cent, at $2.35 on 17.8 million shares.

CGI Group Inc. (TSX:GIB.A). Information technology services. Up 17 cents, or 0.47 per cent, at $36.53 on 16.33 million shares.

Toronto Venture Exchange (946.10 down 6.78 points):

Macusani Yellowcake Inc. (TSXV:YEL). Miner. Unchanged at six cents on 5.6 million shares.

Americas Petrogas Inc. (TSXV:BOE). Oil and gas. Up 14 cents, or 12.96 per cent, at $1.22 on 3.07 million shares. The Calgary-based company announced a strategic review Thursday, which may include a sale or merger of the company.

Company reporting major news:

BlackBerry (TSX:BB). Wireless technology. Down $1.74, or 16.08 per cent, at $9.08 on 13.30 million shares. Poor smartphone sales have forced the company to take a massive writedown on the devices and slash 4,500 jobs across its operations. It says it expects to post a loss of between US$950 million and US$995 million when it reports its second-quarter earnings next Friday.