Most actively traded companies on the TSX

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

Toronto Stock Exchange (13,828.97, down 46.36 points):

Niko Resources Ltd. (TSX:NKO). Oil and gas. Up 9.5 cents, or 190 per cent, to 14.5 cents on 21.7 million shares.

Carlisle Goldfields Ltd. (TSX:CGJ). Miner. Up 26 cents, or 70.27 per cent, to 63 cents on 10.5 million shares.

First Quantum Minerals Ltd. (TSX:FM). Miner. Up 30 cents, or 3.99 per cent, to $7.81 on 5.9 million shares.

Bombardier Inc. (TSX:BBD.B). Aerospace, rail equipment. Down two cents, or 1.18 per cent, to $1.68 on 5.4 million shares.

Yamana Gold Inc. (TSX:YRI). Miner. Down five cents, or 1.51 per cent, to $3.27 on 4.5 million shares.

Penn West Petroleum Ltd. (TSX:PWT). Oil and gas. Down two cents, or 1.34 per cent, to $1.47 on 4.1 million shares.

Companies reporting major news:

Valeant Pharmaceuticals International Inc. (TSX:VRX). Pharmaceutical. Down $12.35, or 5.39 per cent, to $216.73 on 1.2 million shares. Valeant, already in the crosshairs of U.S. politicians, now is under scrutiny by U.S. federal prosecutors in two states who are seeking information on its drug pricing, distribution and patient assistance program. Canada’s largest drugmaker said late Wednesday that it had recently received subpoenas from the U.S. Attorney’s offices in Massachusetts and New York.