; and (2) resulted in increased participation in credit risk-transfer transactions by bank or non-bank mortgage originators having under $10,000,000,000 in assets. (c) Extension of program Based on the assessments in the report required under subsection (b), the Director may extend the program beyond its fifth year of operation if the Director determines that such extension would be in the public interest. 4. Pilot program for mortgage insurance risk transfer (a) In General Not later than one year after the date of the enactment of this Act, the Director shall require each enterprise to establish a pilot program to increase the amount of risk that is shared by the enterprise using private mortgage insurance. (b) Program requirements Each pilot program established pursuant to subsection (a) shall meet the following requirements: (1) Duration The pilot program shall have a duration of 5 years. (2) Amount of mortgage purchases (A) In general Except as provided in subparagraph (B), in each year each enterprise shall purchase under its pilot program sufficient qualifying loans or pools of qualifying loans such that the aggregate unpaid principal balance of all qualifying loans or loan pools purchased by the enterprise is not less than $25,000,000,000. (B) Exception The amount of qualifying loans that each enterprise is required to purchase each year under paragraph (1) may be reduced if the Director and the Secretary of the Treasury jointly— (i) make a determination that such a reduction is necessary to prevent an adverse impact to the housing market