TORONTO (Bloomberg) — Canadian stocks fell for a second day, led by Suncor Energy Inc. and Cameco Corp., as the price of crude oil retreated, dragging down energy producers, the second-biggest industry group in the nation's main equity index.The Standard & Poor's/TSX Composite Index dropped 114.54, or 0.8 percent, to 14,468.33 in Toronto. The benchmark has declined 1.1 percent in two days, after reaching a record on July 19 when crude oil rose, heading toward an 11 month high the next day.

Materials and energy stocks, accounting for more than two- fifths of the S&P/TSX, have helped the index rally 12 percent this year as rising prices for metals and energy boosted companies' profits and cashflows, spurring record take-overs in the global metals and mining industry.

"It might be the end of the cycle for energy stocks," said Andre Chabot, who helps manage about $287 million at Triasima Portfolio Management Inc. in Montreal. "Commodities may have peaked or are no longer going up at a rate that will boost profits by a lot. We're in a bull market but we're cautious: the market may be vulnerable to going sideways for a while."

Suncor Energy, the second-biggest oil-sands miner, dropped C$1.74 to C$98.35. Petro-Canada, the country's third-largest oil and gas company, fell C$1.50 to C$59.75 after reaching the highest ever on July 20. EnCana Corp., Canada's biggest natural-gas producer, lost C$1.01 to C$65 74.

Nexen Inc. retreated 87 cents, or 2.5 percent, to C$34.68. Ontario Teachers' Pension Plan, Canada's third-biggest pension fund manager, said on July 20 in a regulatory filing that it sold 6.5 million shares at C$33.75 apiece on July 18, or about 11 percent of its stake in the oil and gas producer. The sale is part of a "rebalancing" of its portfolio, Teachers' spokeswoman Deborah Allan said.

Oil for September delivery fell 1.2 percent to $74.89 a barrel in New York, after Reuters reported that the Organisation of Petroleum Exporting Countries may pump more oil to increase supplies, on concern that high prices may hurt the world economy. Futures reached $76.13 on July 20, the highest since August 10. Prices are up 23 percent this year.

Shares of Cameco slid C$3.19, or 6.5 percent, to C$46.13, the most in nine months.