The Financial Post reports in its Tuesday, July 11, edition that uninsured mortgages, a new target of federal regulators, represent the greatest risk to the financial industry, especially Canada's largest banks, says a report out Monday from DBRS. The Post's Garry Marr writes that DBRS says about 46 per cent of total mortgages in Canada are now uninsured with the big six banks holding 32 percentage points of that total. Credit unions have eight percentage points and six percentage points held by small to medium-sized institutions, including mortgage investment corporations. "It should help," says DBRS's Sohail Ahmer about changes announced last week from the Office of the Superintendent of Financial Institutions that will require stress tests for uninsured mortgages. "When we talk to financial institutions we find some of the uninsured mortgages, they tend to have reduced scrutiny when it comes to lending standards." The OSFI rule will make the qualifying rate for all mortgages the contract rate plus two percentage points, a move if finalized later this year in its current form, could slow growth in mortgage originations by a full percentage point to about 4.5 per cent, says CIBC's Benjamin Tal.