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

Toronto Stock Exchange (15,081.26, up 124.05 points):

Orbite Aluminae Inc. (TSX:ORT). Miner. Down 8.5 cents, or 21.25 per cent, to 31.5 cents on 11.6 million shares.

Trican Well Service Ltd. (TSX:TCW). Oil and gas. Down 28 cents, or 7.20 per cent, to $3.61 on 8.6 million shares.

Essential Energy Services Ltd. (TSX:ESN). Oil and gas. Up eight cents, or 7.84 per cent, to $1.10 on 6.7 million shares.

Orosur Mining Inc. (TSX:OMI). Miner. Down 1.5 cents, or 8.57 per cent, to 16 cents on 4.6 million shares.

Pacific Rubiales Energy Corp. (TSX:HNU). Oil and gas. Down one cent, or 0.31 per cent, to $3.22 on 4.6 million shares.

Spartan Energy Corp. (TSX:SPE). Oil and gas. Down four cents, or 1.88 per cent, to $2.09 on 3.1 million shares.

Companies reporting major news:

Genworth MI Canada Inc. (TSX:MIC) Insurance. Down 12 cents, or 0.40 per cent, to $30.09 on 280,020 shares. The mortgage insurer is making changes to its underwriting practices in Alberta as it braces for an increase in delinquencies in the region. President and chief executive Stuart Levings said Genworth is exercising “heightened vigilance” in underwriting home purchases in Western Canada in light of the sharp decline in oil prices.