Mortgage finance company Freddie Mac is to pay a $125m penalty to settle allegations of cooking the books.
Freddie Mac is one of America's largest mortgage lenders
US regulators had accused the firm of ignoring accounting rules and of making transactions for the sole purpose of masking its earnings volatility.
The company's board was also criticised for complacency and not supervising its managers properly, by the Office of Federal Housing Enterprise Oversight.
The agency described the firm's whole accountancy practice as weak.
In addition to the $125m (£72m) penalty, Freddie Mac has agreed to separate the functions of chairman and chief executive, consider setting time limits for board members, and submit a plan to improve corporate governance.
Freddie Mac chairman Shaun O'Malley said the settlement was a step towards restoring investor confidence in the company.
But he added that the firm "strongly disagrees" with parts of the agency's investigation into its accounting problems.
Mr O'Malley said: "The board and management are working tirelessly to implement our remediation program to ensure that nothing like this ever happens again."
Last month Freddie Mac said it had under-reported earnings by $4.4bn (£2.5bn) between 2000 and 2002.
Back in June it replaced its chief executive Leland Brendsel, and then in August agreed to remove his replacement Gregory Parseghian, because of their roles in the accountancy problems.