Some of the most active companies traded Thursday on the Toronto Stock Exchange:Toronto Stock Exchange (15,074.25, down 143.08 points):Aimia Inc. (TSX:AIM). Loyalty programs. Up 32 cents, or 20.13 per cent, to $1.91 on 6.4 million shares. The Montreal-based loyalty program operator swung to a loss of $25.1 million in its latest quarter as it said it’s in talks with a number of potential partners to replace its departing Aeroplan partner Air Canada. CEO David Johnson wouldn’t provide many details of the company’s plans for replacing Air Canada, but said the Aimia will continue to be a multi-airline program. The company expects to reduce annualized costs by $70 million by the end of 2019, in part by cutting its workforce.Primero Mining Corp. (TSX:P). Miner. Down 24.5 cents, or 46.74 per cent, to 21.5 cents on 5.6 million shares.Element Fleet Management Corp. (TSX:EFN). Financial Services. Down 83 cents, or 8.9 per cent, to $8.50 on 5.5 million shares.Manulife Financial Corp. (TSX:MFC). Financial Services. Down $1.21, or 4.72 per cent, to $24.42 on 5.2 million shares.BetaPro Crude Oil. (TSX:HOU). Oil and gas. Down 29 cents, or 4.68 per cent, to $5.91 on 4.7 million shares.Encana Corp. (TSX:ECA). Oil and gas. Down 22 cents, or 1.77 per cent, to $12.20 on 4 million shares.Companies reporting major news:CI Financial Corp. (TSX:CIX). Financial Services. The company has agreed to buy Sentry Investments Corp. in a friendly deal worth about $780 million, adding to its portfolio of mutual funds. CI’s assets under management will rise by 16 per cent to $140 billion when the deal closes, subject to regulatory approvals.