Source: Board of Governors of the Federal Reserve System (US)
Release: H.4.1 Factors Affecting Reserve Balances
The current face value of mortgage-backed obligations held by Federal Reserve Banks. These securities are guaranteed by Fannie Mae, Freddie Mac, or Ginnie Mae.
Board of Governors of the Federal Reserve System (US), Assets: Securities Held Outright: Mortgage-Backed Securities: Wednesday Level [WSHOMCB], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WSHOMCB, March 26, 2023.