FDLXX - Fidelity Treasury Only 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), FDLXX (Fidelity Treasury Only Money Market Fund) has a 7-day net yield of 3.48%.
- FDLXX's 7-day yield ranks #533 of 886 US money-market fund ticker share classes reporting a yield for September 2026.
- FDLXX is a Government money-market fund share class with $14.9B in net assets (#89 of 886 ticker classes by size).
- The fund's series-level 7-day gross yield was 3.91% - the 0.43-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 45 days and a weighted average life (WAL) of 98 days, with 100.0% of assets in daily liquid assets and 100.0% in weekly liquid assets (SEC minimums: 25% daily, 50% weekly).
- Twelve months earlier (September 2025) FDLXX's 7-day yield was 3.74% - it has moved down 0.26 points over the year.
- FDLXX's highest month-end 7-day yield in the SEC's structured data (since April 2016) is 5.01%, reported for October 2023.
- 98.67% of FDLXX's 2025 dividend income came from US government obligations per Fidelity - generally exempt from state income tax, and the fund met the CA/NY/CT 50%-asset test.
Yield history
Portfolio (series level)
Other share classes of this fund
| Class | Ticker | 7-day yield | Net assets | Min. investment |
|---|---|---|---|---|
| Fidelity Treasury Only Money Market Fund - Class OUS | FYIXX | 3.53% | $5.1B | None |
Compare
SPAXX vs FDLXX · FDLXX vs VUSXX · FDLXX vs SNSXX · FDLXX vs FZFXX · FDRXX vs FDLXX · VMFXX vs FDLXX · SWVXX vs FDLXX · FDLXX vs VMRXX · FDLXX vs SPRXX · FDLXX vs SNVXX · FDLXX vs SNOXX · FDLXX vs FZDXX · FDLXX vs SNAXX · FDLXX vs VMSXX · FDLXX vs SWOXX · FDLXX vs TSCXX · FDLXX vs GABXX
Fund context & source
Fidelity Treasury Only Money Market Fund is a series of Fidelity Hereford Street Trust (SEC series ID S000007053). The whole series held $20.0B 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 98.67% of FDLXX's 2025 dividend income came from US government obligations - the portion most states exempt from income tax. The fund met 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 FDLXX's 7-day yield?
As of the September 2026 month-end SEC Form N-MFP filing (September 30, 2026), FDLXX (Fidelity Treasury Only Money Market Fund) has a 7-day net yield of 3.48%.
Is FDLXX a government money market fund?
Yes - FDLXX is classified as a Government money-market fund in its own September 2026 Form N-MFP filing.
What is the minimum initial investment for FDLXX?
FDLXX reports a minimum initial investment of None on its September 2026 Form N-MFP filing.