ZMUN — F/m Ultrashort Tax-Free Municipal ET
Data updated: 2026-07-28
ZMUN — F/m Ultrashort Tax-Free Municipal ET data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Short Municipal - National Bond · $27.03M AUM · 0.30% expense ratio. From SEC regulatory filings.
ZMUN Fund Overview
ZMUN — F/m Ultrashort Tax-Free Municipal ET is a US mutual fund managed by Rbb Fund, Inc., categorised as Short Municipal - National Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Rbb Fund, Inc.
- Category: Short Municipal - National Bond
- Assets under management: $27.03M
- Ticker: ZMUN
- SEC CIK: 0000831114
- SEC series ID: S000091541
- Share class ID: C000259209
ZMUN Holdings
Top 10 holdings of F/m Ultrashort Tax-Free Municipal ET by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| BlackRock Liquidity Funds Muni | 10.13% |
| South Dakota St Hlth & Eductnl | 3.70% |
| New York St Dorm Auth St Perso | 2.79% |
| Univ Of Kentucky Ky Gen Recpts | 2.72% |
| Great Lakes Mi Wtr Auth Wtr Sp | 2.60% |
| Lee Cnty Fl Sch Brd Cops | 2.39% |
| Illinois St | 2.23% |
| North Carolina St Muni Pwr Agy | 2.17% |
| Washington St | 1.86% |
| Los Angeles Cnty Ca Public Wks | 1.85% |
ZMUN Portfolio Allocation
Asset-class allocation of F/m Ultrashort Tax-Free Municipal ET by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 96.0% |
| Cash & Equivalents | 10.1% |
ZMUN Performance
Total returns for ZMUN (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.6% |
ZMUN Costs and Fees
ZMUN costs about $30 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.30%
- Gross expense ratio: 0.30%
- Portfolio turnover: 0%
ZMUN Cashflows
Over the 12 months to 2026-02, F/m Ultrashort Tax-Free Municipal ET had net inflows of $11.50M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | −$1.51M |
| 2026-01 | $0 |
| 2025-12 | $2.01M |
| 2025-11 | $0 |
| 2025-10 | $10.00M |
| 2025-09 | $1.00M |
ZMUN Debt Constituents
Largest debt holdings of F/m Ultrashort Tax-Free Municipal ET by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| South Dakota St Hlth & Eductnl | 3.70% |
| New York St Dorm Auth St Perso | 2.79% |
| Univ Of Kentucky Ky Gen Recpts | 2.72% |
| Great Lakes Mi Wtr Auth Wtr Sp | 2.60% |
| Lee Cnty Fl Sch Brd Cops | 2.39% |
| Illinois St | 2.23% |
| North Carolina St Muni Pwr Agy | 2.17% |
| Washington St | 1.86% |
| Los Angeles Cnty Ca Public Wks | 1.85% |
| Wisconsin St Hlth & Eductnl Fa | 1.85% |
ZMUN Prospectus and SEC Filings
Official F/m Ultrashort Tax-Free Municipal ET filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Short Municipal - National Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.