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core position

an account that is automatically established when a Fidelity account is opened; used for processing cash transactions and holding uninvested cash; when a security is sold, the proceeds are deposited into the account; when a security is bought, cash in the account is used to pay for the trade

Types of Fidelity Money Market Funds & Core Eligibility

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.

Retail funds
Government Fidelity Treasury Only Money Market Fund (FDLXX)
Fidelity Treasury Money Market Fund (FLTXX)*
Fidelity Government Money Market Fund (SPAXX)* 
Fidelity U.S. Government Reserves (FGRXX)
General purpose/prime Fidelity Cash Reserves (FDRXX)*
Fidelity Select Money Market Portfolio (FSLXX)
Fidelity Money Market Fund (SPRXX) 
Institutional portfolios (class I)
Treasury only Fidelity Institutional Money Market Treasury Only – Class I (FSIXX)
Treasury Fidelity Institutional Money Market Treasury Portfolio – Class I (FISXX) 
Government Fidelity Institutional Money Market Government Portfolio – Class I (FIGXX) 
General purpose/prime Fidelity Institutional Money Market Prime Money Market Portfolio – Class I (FIDXX)
Fidelity Institutional Money Market – Money Market Portfolio – Class I (FMPXX)
Institutional portfolios (institutional classes)
General purpose/prime Fidelity Institutional Money Market Prime Money Market Portfolio – Institutional Class (FIPXX) 
Fidelity Institutional Money Market – Money Market Portfolio – Institutional Class (FNSXX) 
Other
Government Fidelity Money Market Trust Retirement Government Money Market Portfolio (FGMXX) 
General purpose/prime Fidelity Money Market Trust Retirement Money Market Portfolio (FRTXX) 
*Taxable money market funds are eligible for use as the core position in retirement accounts. For non-retirement accounts, Fidelity Government Money Market Fund (SPAXX) and Fidelity Treasury Money Market Fund (FLTXX), can also be used as a core position.

Questions?

Fidelity Learning Center

Before investing, consider the investment objectives, risks, charges, and expenses of the fund or annuity and its investment options. Call or write to Fidelity or visit Fidelity.com for a free prospectus and, if available, a summary prospectus containing this information. Read it carefully.

An investment in a money market fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Although the fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the fund.
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