SPAXX - Fidelity Government Money Market Fund
7-day yield, assets, and how it ranks - from the September 2026 month-end N-MFP filing.
Data: September 2026 month-end SEC filings
All figures are from the September 2026 month-end Form N-MFP filings (report date ) - money-market funds must file within five business days of month-end. Regulatory data, not live quotes.
- As of the Form N-MFP filing (September 2026 month-end), SPAXX (Fidelity Government Money Market Fund) has a 7-day net yield of 3.48%.
- SPAXX's 7-day yield ranks #530 of 886 US money-market fund ticker share classes reporting a yield for September 2026.
- SPAXX is a Government money-market fund share class with $433.8B in net assets (#1 of 886 ticker classes by size).
- The fund's series-level 7-day gross yield was 3.90% - the 0.42-point gap to this class's net yield reflects fund expenses.
- At September 2026 month-end the fund's portfolio had a weighted average maturity (WAM) of 38 days and a weighted average life (WAL) of 111 days, with 58.0% of assets in daily liquid assets and 74.0% in weekly liquid assets (SEC minimums: 25% daily, 50% weekly).
- Twelve months earlier (September 2025) SPAXX's 7-day yield was 3.80% - it has moved down 0.32 points over the year.
- SPAXX's highest month-end 7-day yield in the SEC's structured data (since April 2016) is 5.01%, reported for December 2023.
Yield history
Portfolio (series level)
Other share classes of this fund
| Class | Ticker | 7-day yield | Net assets | Min. investment |
|---|---|---|---|---|
| Fidelity Government Money Market Fund - Premium Class | FZCXX | 3.58% | $14.1B | $100,000 |
| Fidelity Government Money Market Fund - Daily Money Class | FZBXX | 3.20% | $8.8B | None |
| Fidelity Government Money Market Fund - Class K6 | FNBXX | 3.65% | $5.1B | None |
| Fidelity Government Money Market Fund - Capital Reserves Class | FZAXX | 2.94% | $3.6B | None |
| Fidelity Government Money Market Fund - Class M | FZGXX | 3.20% | $219.7M | None |
| Fidelity Government Money Market Fund - Class S | FZSXX | 3.48% | $180.7M | None |
Compare
VMFXX vs SPAXX · SWVXX vs SPAXX · SPAXX vs FDLXX · SPAXX vs SPRXX · SPAXX vs FZFXX · SPAXX vs SNVXX · FDRXX vs SPAXX · SPAXX vs SNSXX · SPAXX vs VMRXX · SPAXX vs VUSXX · SPAXX vs SNOXX · SPAXX vs FZDXX · SPAXX vs SNAXX · SPAXX vs VMSXX · SPAXX vs SWOXX · SPAXX vs TSCXX · SPAXX vs GABXX
Fund context & source
Fidelity Government Money Market Fund is a series of Fidelity Hereford Street Trust (SEC series ID S000007051). The whole series held $465.9B across all share classes at September 2026 month-end.
This page shows the class's month-end regulatory filing, not a live quote - 7-day yields move daily. For today's yield, check Fidelity. Verify the filing itself on EDGAR: N-MFP filings for this series.
State-tax note (2025 tax year)
Fidelity reports that 50.90% of SPAXX's 2025 dividend income came from US government obligations - the portion most states exempt from income tax. The fund did not meet the 50%-of-assets test that California, Connecticut, and New York require (source). Figures change each tax year. Full table and calculator: tax-equivalent yield.
FAQ
What is SPAXX's 7-day yield?
As of the September 2026 month-end SEC Form N-MFP filing (September 30, 2026), SPAXX (Fidelity Government Money Market Fund) has a 7-day net yield of 3.48%.
Is SPAXX a government money market fund?
Yes - SPAXX is classified as a Government money-market fund in its own September 2026 Form N-MFP filing.
What is the minimum initial investment for SPAXX?
SPAXX reports a minimum initial investment of None on its September 2026 Form N-MFP filing.