The types of debt securities held by money market mutual funds are required by federal regulation to be very short in maturity and high in credit quality in order to improve their ability to maintain a stable share price even during times of financial market stress.
Investments can include short-term U.S. Treasury securities, federal agency notes, Eurodollar deposits, repurchase agreements, certificates of deposit (CDs), corporate commercial paper, and obligations of states, cities, or other types of municipal agencies—depending on the focus of the fund.
|Fund type||Primary types of instruments held|
|Treasury||U.S. Treasury securities and repurchase agreements collateralized by U.S. Treasury securities|
|Government||U.S. Treasury and other U.S. government securities and repurchase agreements collateralized by U.S. Treasury or other U.S. government securities|
|General purpose (also known as prime)||Any eligible money market instruments (as defined by applicable regulations) including all types listed above, as well as commercial paper, certificates of deposit (CDs), corporate notes, and other private instruments|
|Municipal||Tax-exempt securities issued by agencies of the federal government, state and local governments, and non-profit entities|
Fidelity money market mutual funds are listed below by the focus of the fund and the types of securities in which it primarily invests.