FMUB vs. VUSB

Last updated Jun 14, 2026

FMUB (Fidelity Municipal Bond Opportunities ETF) and VUSB (Vanguard Ultra-Short Bond ETF) are both exchange-traded funds - FMUB is a Municipal Bonds fund actively managed by Fidelity, while VUSB is a Ultrashort Bond fund actively managed by Vanguard. Both are actively managed. Over the past year, FMUB returned 6.87% vs 4.47% for VUSB. At a 0.41 correlation, their price movements are largely independent. FMUB charges 0.30%/yr vs 0.10%/yr for VUSB.

Performance

FMUB vs. VUSB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Municipal Bond Opportunities ETF (FMUB) and Vanguard Ultra-Short Bond ETF (VUSB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FMUB achieves a 1.73% return, which is significantly higher than VUSB's 1.48% return.

FMUB

• 1D: -0.16%
• 1M: 0.67%
• YTD: 1.73%
• 6M: 2.11%
• 1Y: 6.87%
• 3Y*: —
• 5Y*: —
• 10Y*: —

VUSB

• 1D: 0.00%
• 1M: 0.31%
• YTD: 1.48%
• 6M: 1.78%
• 1Y: 4.47%
• 3Y*: 5.40%
• 5Y*: 3.45%
• 10Y*: —

*Multi-year figures are annualized to reflect compound growth (CAGR)

FMUB vs. VUSB - Yearly Performance Comparison

	2026 (YTD)	2025
FMUB Fidelity Municipal Bond Opportunities ETF	1.73%	4.69%
VUSB Vanguard Ultra-Short Bond ETF	1.48%	4.00%

Correlation

The correlation between FMUB and VUSB is 0.43, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.43
Correlation (All Time) Calculated using the full available price history since Apr 7, 2025	0.41

Return for Risk

FMUB vs. VUSB — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

FMUB

FMUB Risk / Return Rank: 80
FMUB Sharpe Ratio Rank: 88
FMUB Sortino Ratio Rank: 90
FMUB Omega Ratio Rank: 92
FMUB Calmar Ratio Rank: 62
FMUB Martin Ratio Rank: 67

VUSB

VUSB Risk / Return Rank: 99
VUSB Sharpe Ratio Rank: 99
VUSB Sortino Ratio Rank: 99
VUSB Omega Ratio Rank: 99
VUSB Calmar Ratio Rank: 98
VUSB Martin Ratio Rank: 98

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

FMUB vs. VUSB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Municipal Bond Opportunities ETF (FMUB) and Vanguard Ultra-Short Bond ETF (VUSB). Risk-adjusted metrics are performance indicators that assess an investment's returns in relation to its risk, enabling a more accurate comparison of different investment options.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	FMUB	VUSB	Difference
Sharpe ratio: Return per unit of total volatility	2.56	6.91	-4.34
Sortino ratio: Return per unit of downside risk	3.74	12.46	-8.72
Omega ratio: Gain probability vs. loss probability	1.54	3.34	-1.80
Calmar ratio: Return relative to maximum drawdown	2.73	12.12	-9.39
Martin ratio: Return relative to average drawdown	10.84	69.82	-58.99

FMUB vs. VUSB - Sharpe Ratio Comparison

The current FMUB Sharpe Ratio is 2.56, which is lower than the VUSB Sharpe Ratio of 6.91. The chart below compares the historical Sharpe Ratios of FMUB and VUSB, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

FMUB vs. VUSB - Drawdown Comparison

The maximum FMUB drawdown since its inception was -2.74%, which is greater than VUSB's maximum drawdown of -1.79%. Use the drawdown chart below to compare losses from any high point for FMUB and VUSB.

Drawdown Indicators

	FMUB	VUSB	Difference
Max Drawdown Largest peak-to-trough decline	-2.74%	-1.79%	-0.95%
Max Drawdown (1Y) Largest decline over 1 year	-2.49%	-0.37%	-2.12%
Max Drawdown (3Y) Largest decline over 3 years	—	-0.46%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-1.79%	—
Current Drawdown Current decline from peak	-0.26%	0.00%	-0.26%
Average Drawdown Average peak-to-trough decline	-0.48%	-0.27%	-0.21%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.63%	0.06%	+0.57%

Volatility

FMUB vs. VUSB - Volatility Comparison

Fidelity Municipal Bond Opportunities ETF (FMUB) has a higher volatility of 0.90% compared to Vanguard Ultra-Short Bond ETF (VUSB) at 0.19%. This indicates that FMUB's price experiences larger fluctuations and is considered to be riskier than VUSB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FMUB	VUSB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.90%	0.19%	+0.71%
Volatility (6M) Calculated over the trailing 6-month period	2.02%	0.53%	+1.49%
Volatility (1Y) Calculated over the trailing 1-year period	2.67%	0.65%	+2.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.65%	0.83%	+2.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.65%	0.82%	+2.83%

FMUB vs. VUSB - Expense Ratio Comparison

FMUB has a 0.30% expense ratio, which is higher than VUSB's 0.10% expense ratio.

Dividends

FMUB vs. VUSB - Dividend Comparison

FMUB's dividend yield for the trailing twelve months is around 3.43%, less than VUSB's 4.39% yield.

Position	TTM	2025	2024	2023	2022	2021
FMUB Fidelity Municipal Bond Opportunities ETF	3.43%	2.63%	0.00%	0.00%	0.00%	0.00%
VUSB Vanguard Ultra-Short Bond ETF	4.39%	4.63%	5.16%	4.45%	1.56%	0.26%

Frequently Asked Questions

Can I hold both FMUB and VUSB in my portfolio?

FMUB and VUSB have a correlation of 0.43, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FMUB or VUSB?

FMUB has higher volatility (0.90%) compared to VUSB (0.19%). In terms of maximum drawdown, FMUB dropped -2.74% vs VUSB's -1.79%.

Which ETF is better, FMUB or VUSB?

On 1-year performance, FMUB leads with 6.87% vs 4.47% for VUSB. On fees, VUSB is cheaper at 0.10% per year. On volatility, VUSB has been the lower-risk option at 0.19%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, FMUB or VUSB?

Over the 1-year period, FMUB has performed better with a 6.87% return vs 4.47%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, FMUB or VUSB?

VUSB is cheaper with a 0.10% expense ratio, compared with 0.30% for FMUB.

Which ETF pays a higher dividend yield, FMUB or VUSB?

VUSB has the higher dividend yield at 4.39%, compared with 3.43% for FMUB.

What is the main difference between FMUB and VUSB?

FMUB is categorized as Municipal Bonds, while VUSB is Ultrashort Bond. They also come from different issuers: Fidelity and Vanguard. Their fees differ too: 0.30% for FMUB and 0.10% for VUSB.

Which has better risk-adjusted returns?

VUSB currently has the higher Sharpe Ratio (6.91 vs 2.56), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.