Source: Board of Governors of the Federal Reserve System (US)
Release: H.6 Money Stock Measures
The retail money funds component of M2 is constructed from weekly data collected by the Investment Company Institute (ICI), a trade association for the investment company industry. The retail money funds component of M2 excludes IRA and Keogh balances held at MMMFs, which are reported by ICI on a quarterly basis.
Board of Governors of the Federal Reserve System (US), Retail Money Market Funds [WRMFNS], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/WRMFNS, June 7, 2023.