SIOXX — UBS Select 100% US Treasury Institutional Fund
7-day yield, assets, and how it ranks — from the June 2026 month-end N-MFP filing.
Data: June 2026 month-end SEC filings
All figures are from the June 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 (June 2026 month-end), SIOXX (UBS Select 100% US Treasury Institutional Fund) has a 7-day net yield of 3.52%.
- SIOXX's 7-day yield ranks #233 of 873 US money-market fund ticker share classes reporting a yield for June 2026.
- SIOXX is a Government money-market fund share class with $7.9B in net assets (#133 of 873 ticker classes by size).
- The fund's series-level 7-day gross yield was 3.70% — the 0.18-point gap to this class's net yield reflects fund expenses.
- At June 2026 month-end the fund's portfolio had a weighted average maturity (WAM) of 1 days and a weighted average life (WAL) of 1 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 (June 2025) SIOXX's 7-day yield was 4.11% — it has moved down 0.59 points over the year.
- SIOXX's highest month-end 7-day yield in the SEC's structured data (since April 2016) is 5.18%, reported for March 2024.
Yield history
Portfolio (series level)
Other share classes of this fund
| Class | Ticker | 7-day yield | Net assets | Min. investment |
|---|---|---|---|---|
| Token-Enabled Shares | TOKXX | 3.52% | $100,654 | None |
Fund context & source
UBS Select 100% US Treasury Institutional Fund is a series of UBS Series Funds (SEC series ID S000084282). The whole series held $7.9B across all share classes at June 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 UBS Asset Management. Verify the filing itself on EDGAR: N-MFP filings for this series.
FAQ
What is SIOXX's 7-day yield?
As of the June 2026 month-end SEC Form N-MFP filing (June 30, 2026), SIOXX (UBS Select 100% US Treasury Institutional Fund) has a 7-day net yield of 3.52%.
Is SIOXX a government money market fund?
Yes — SIOXX is classified as a Government money-market fund in its own June 2026 Form N-MFP filing.
What is the minimum initial investment for SIOXX?
SIOXX reports a minimum initial investment of None on its June 2026 Form N-MFP filing.