The agency says the slip followed two quarterly increases.
Operating profits decreased in 15 of 22 industries tracked in the second quarter, with manufacturing, the oil and gas and the insurance industry leading the decline.
In the non-financial sector, operating profits declined five per cent to $52.2 billion, following a 5.1 per cent decrease in the first quarter.
In the financial sector, operating profits decreased 4.6 per cent to $19.7 billion, following a 20.1 per cent gain in the first quarter.
Meanwhile, on a year-over-year basis, operating profits for Canadian corporations were 1.5 per cent higher in the second quarter this year than in the second quarter of 2011.