On November 25, 2008, the Federal Reserve announced a program to purchase mortgage-backed securities guaranteed by Fannie Mae, Freddie Mac, and Ginnie Mae. The goal of the program is to provide support to mortgage and housing markets and to foster improved conditions in financial markets. Purchases of these securities began on January 5, 2009. Additional information on System transactions in mortgage-backed securities is available at www.newyorkfed.org/markets/mbs/.
Board of Governors of the Federal Reserve System (US), Factors Supplying Reserve Balances - Securities Held Outright - Mortgage-Backed Securities [WSHOMBSL], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/WSHOMBSL/, August 5, 2015.