SPAXX vs FZDXX
Side-by-side 7-day yields from the September 2026 month-end N-MFP filings.
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 September 2026 month-end filings, FZDXX's 7-day yield of 3.68% is 0.20 points above SPAXX's 3.48%.
| SPAXX | FZDXX | |
|---|---|---|
| Fund | Fidelity Government Money Market Fund | Fidelity Money Market Fund |
| Category | Government | Prime |
| 7-day net yield | 3.48% | 3.68% |
| Yield as of | ||
| Net assets (class) | $433.8B | $121.1B |
| Series gross 7-day yield | 3.90% | 3.98% |
| Implied expense gap (gross − net) | 0.42% | 0.30% |
| WAM / WAL (days) | 38 / 111 | 14 / 24 |
| Daily / weekly liquid assets | 58.0% / 74.0% | 63.0% / 78.0% |
| Minimum initial investment | None | $100,000 |
| 2025 USGO income (state tax) | 50.90% | - |
| Manager | Fidelity Hereford Street Trust | Fidelity Hereford Street Trust |
Five-year yield history
FAQ
Which has a higher 7-day yield, SPAXX or FZDXX?
FZDXX - as of the September 2026 month-end SEC Form N-MFP filings, FZDXX's 7-day net yield of 3.68% is 0.20 percentage points above SPAXX's 3.48%.
Numbers only - this site makes no recommendation between funds. Both rows come from each fund's own September 2026 month-end Form N-MFP filing; yields move daily, so check each fund company for live figures (links on the SPAXX and FZDXX pages).