USMBX — Columbia Ultra Short Duration Municipal Bond Fund
Data updated: 2026-07-29
USMBX — Columbia Ultra Short Duration Municipal Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Leveraged · $71.89M AUM · 0.47% expense ratio · 3.2% 1-yr return. From SEC regulatory filings.
USMBX Fund Overview
USMBX — Columbia Ultra Short Duration Municipal Bond Fund is a US mutual fund managed by Columbia Funds Series Trust II, categorised as Leveraged. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Columbia Funds Series Trust II
- Category: Leveraged
- Assets under management: $71.89M
- 1-year return: 3.2%
- Ticker: USMBX
- SEC CIK: 0001352280
- SEC series ID: S000074124
- Share class ID: C000231692
USMBX Holdings
Top 10 holdings of Columbia Ultra Short Duration Municipal Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| BlackRock Liquidity Funds MuniCash | 4.97% |
| State of Maryland | 2.93% |
| Fairfax County Redevelopment & Housing Authority | 2.84% |
| Port Authority Of New York And New Jersey | 2.80% |
| Colorado Housing and Finance Authority | 2.79% |
| State of Minnesota | 2.66% |
| City of Fall River MA | 2.22% |
| State of Wisconsin | 2.13% |
| Missouri (state Of) | 2.11% |
| PMA Levy & Aid Anticipation Notes Program | 2.10% |
USMBX Portfolio Allocation
Asset-class allocation of Columbia Ultra Short Duration Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 94.0% |
| Equity | 5.0% |
USMBX Performance
Total returns for USMBX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.9% |
| 1 year | 3.2% |
| 3 years (annualised) | 3.2% |
USMBX Risk Information
Risk metrics for USMBX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 0.6%
USMBX Costs and Fees
USMBX costs about $47 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.47%
- Gross expense ratio: 0.66%
- Portfolio turnover: 38%
- Brokerage commissions: 0.00 bps of average net assets (SEC N-CEN)
USMBX Cashflows
Over the 12 months to 2026-02, Columbia Ultra Short Duration Municipal Bond Fund had net inflows of $7.29M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-02 | −$2.91M |
| 2026-01 | $25.73M |
| 2025-12 | −$1.45M |
| 2025-11 | −$7.23M |
| 2025-10 | −$1.11M |
| 2025-09 | −$193.18K |
USMBX Debt Constituents
Largest debt holdings of Columbia Ultra Short Duration Municipal Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| State of Maryland | 2.93% |
| Fairfax County Redevelopment & Housing Authority | 2.84% |
| Port Authority Of New York And New Jersey | 2.80% |
| Colorado Housing and Finance Authority | 2.79% |
| State of Minnesota | 2.66% |
| City of Fall River MA | 2.22% |
| State of Wisconsin | 2.13% |
| Missouri (state Of) | 2.11% |
| PMA Levy & Aid Anticipation Notes Program | 2.10% |
| City of Los Angeles Department of Airports | 2.09% |
USMBX Prospectus and SEC Filings
Official Columbia Ultra Short Duration Municipal Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Leveraged 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.