Source: Board of Governors of the Federal Reserve System (US)
Release: H.4.1 Factors Affecting Reserve Balances
The amount of securities held by Federal Reserve Banks. This quantity is the cumulative result of permanent open market operations: outright purchases or sales of securities, conducted by the Federal Reserve. Section 14 of the Federal Reserve Act defines the securities that the Federal Reserve is authorized to buy and sell.
Board of Governors of the Federal Reserve System (US), Assets: Securities Held Outright: Securities Held Outright: Wednesday Level [WSHOSHO], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WSHOSHO, June 2, 2023.