USMBX Performance — Columbia Ultra Short Duration Municipal Bond Fund, Class A
Data updated: 2026-09-30
USMBX returned +0.91% year to date and +2.72% over one year to May 2026. The annualised 3-year return is +3.05%. The fund trailed its Trading - Leveraged category average: $100 invested three years ago grew to $109, against $173 for the category, and to $103 over one year, against $137. Volatility over the past three years was 0.86% a year. In the 12 months to May 2026 the fund took in a net $2.5M, and assets reached $71.89M.
USMBX Growth of $100
What $100 invested in Columbia Ultra Short Duration Municipal Bond Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Trading - Leveraged category average over the same months.
| Period | USMBX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $103 | $137 |
| 3 years (Jun 2023 – May 2026) | $109 | $173 |
| Since data start (Dec 2021 – May 2026) | $110 | $156 |
USMBX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +0.91% |
| 1 year | +2.72% |
| 3 years (annualised) | +3.05% |
USMBX Annual Returns
Calendar-year total returns of Columbia Ultra Short Duration Municipal Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +0.91% |
| 2025 | +3.07% |
| 2024 | +2.81% |
| 2023 | +2.85% |
| 2022 | −0.02% |
| 2021 (Dec–Dec) | +0.01% |
USMBX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.5% | +0.4% | −0.4% | +0.2% | +0.2% | — | — | — | — | — | — | — |
| 2025 | +0.5% | +0.3% | +0.1% | −0.1% | +0.4% | +0.4% | +0.3% | +0.4% | +0.1% | 0.0% | +0.2% | +0.2% |
| 2024 | +0.2% | +0.1% | 0.0% | +0.2% | +0.2% | +0.5% | +0.6% | +0.6% | +0.3% | −0.1% | +0.4% | +0.1% |
| 2023 | +0.7% | −0.6% | +0.8% | −0.2% | −0.1% | +0.5% | +0.1% | +0.2% | −0.2% | +0.2% | +0.9% | +0.5% |
| 2022 | −0.4% | −0.1% | −0.3% | −0.4% | +0.3% | +0.1% | +0.2% | −0.2% | −0.3% | +0.1% | +0.7% | +0.1% |
| 2021 | — | — | — | — | — | — | — | — | — | — | — | 0.0% |
USMBX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 0.86%
- 3-year Sharpe ratio: -1.68 (vs 4.5% risk-free rate)
- Best month: +0.93% (Nov 2023)
- Worst month: −0.38% (Mar 2026)
USMBX Fund Flows
Monthly money in and out of Columbia Ultra Short Duration Municipal Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $2.5M
- 12-month gross sales (incl. reinvestments): $42.4M
- Sales ÷ redemptions: 1.06×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $696K | $1.4M | −$686K |
| Apr 2026 | $400K | $2.2M | −$1.8M |
| Mar 2026 | $500K | $7.0M | −$6.5M |
| Feb 2026 | $744K | $3.7M | −$2.9M |
| Jan 2026 | $29.6M | $3.8M | $25.7M |
| Dec 2025 | $456K | $1.9M | −$1.5M |
| Nov 2025 | $417K | $7.7M | −$7.2M |
| Oct 2025 | $314K | $1.4M | −$1.1M |
| Sep 2025 | $651K | $844K | −$193K |
| Aug 2025 | $1.9M | $5.1M | −$3.2M |
| Jul 2025 | $5.1M | $2.0M | $3.1M |
| Jun 2025 | $1.6M | $2.9M | −$1.3M |
USMBX Assets Under Management
Net assets of Columbia Ultra Short Duration Municipal Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $71.89M |
| 2026-02-28 | $81.37M |
| 2025-11-30 | $59.67M |
| 2025-08-31 | $68.37M |
| 2025-05-31 | $69.41M |
| 2025-02-28 | $73.84M |
| 2024-11-30 | $77.67M |
| 2024-08-31 | $87.11M |
| 2024-05-31 | $97.01M |
| 2024-02-29 | $101.46M |
| 2023-11-30 | $123.86M |
| 2023-08-31 | $131.25M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.