Freddie’s charter calls for the company to make home loans more accessible. Its chief executive, Charles Haldeman Jr., recently told Congress that his company is “helping financially strapped families reduce their mortgage costs through refinancing their mortgages.”

But the trades, uncovered for the first time in an investigation by ProPublica and NPR, give Freddie a powerful incentive to do the opposite, highlighting a conflict of interest at the heart of the company.null