SUB vs. FUMB

Last updated Jun 20, 2026

SUB (iShares Short-Term National Muni Bond ETF) and FUMB (First Trust Ultra Short Duration Municipal ETF) are both Municipal Bonds funds. SUB is passively managed, while FUMB is actively managed. Over the past 5 years, SUB returned 1.50%/yr vs 1.99%/yr for FUMB. At a 0.20 correlation, their price movements are largely independent. SUB charges 0.07%/yr vs 0.45%/yr for FUMB.

Performance

SUB vs. FUMB - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Short-Term National Muni Bond ETF (SUB) and First Trust Ultra Short Duration Municipal ETF (FUMB). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SUB achieves a 0.93% return, which is significantly lower than FUMB's 1.27% return.

SUB

• 1D: 0.12%
• 1M: 0.56%
• YTD: 0.93%
• 6M: 1.09%
• 1Y: 3.02%
• 3Y*: 3.12%
• 5Y*: 1.50%
• 10Y*: 1.48%

FUMB

• 1D: -0.02%
• 1M: 0.27%
• YTD: 1.27%
• 6M: 1.27%
• 1Y: 2.68%
• 3Y*: 2.98%
• 5Y*: 1.99%
• 10Y*: —

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

SUB vs. FUMB - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018
SUB iShares Short-Term National Muni Bond ETF	0.93%	3.64%	2.17%	2.91%	-2.05%	0.03%	2.51%	2.93%	1.34%
FUMB First Trust Ultra Short Duration Municipal ETF	1.27%	2.78%	3.05%	2.84%	-0.03%	0.38%	1.25%	1.76%	0.35%

Correlation

The correlation between SUB and FUMB is 0.24, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.24
Correlation (3Y) Calculated over the trailing 3-year period	0.22
Correlation (5Y) Calculated over the trailing 5-year period	0.28
Correlation (All Time) Calculated using the full available price history since Nov 5, 2018	0.20

Return for Risk

SUB vs. FUMB — Risk / Return Rank

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

SUB

SUB Risk / Return Rank: 84
SUB Sharpe Ratio Rank: 92
SUB Sortino Ratio Rank: 93
SUB Omega Ratio Rank: 94
SUB Calmar Ratio Rank: 77
SUB Martin Ratio Rank: 62

FUMB

FUMB Risk / Return Rank: 97
FUMB Sharpe Ratio Rank: 95
FUMB Sortino Ratio Rank: 96
FUMB Omega Ratio Rank: 96
FUMB Calmar Ratio Rank: 98
FUMB Martin Ratio Rank: 97

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.

SUB vs. FUMB - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Short-Term National Muni Bond ETF (SUB) and First Trust Ultra Short Duration Municipal ETF (FUMB). 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.

	SUB	FUMB	Difference
Sharpe ratio: Return per unit of total volatility	3.00	3.52	-0.51
Sortino ratio: Return per unit of downside risk	4.34	5.53	-1.20
Omega ratio: Gain probability vs. loss probability	1.66	1.80	-0.15
Calmar ratio: Return relative to maximum drawdown	3.76	12.29	-8.53
Martin ratio: Return relative to average drawdown	10.63	46.28	-35.65

SUB vs. FUMB - Sharpe Ratio Comparison

The current SUB Sharpe Ratio is 3.00, which is comparable to the FUMB Sharpe Ratio of 3.52. The chart below compares the historical Sharpe Ratios of SUB and FUMB, 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

SUB vs. FUMB - Drawdown Comparison

The maximum SUB drawdown since its inception was -9.46%, which is greater than FUMB's maximum drawdown of -2.68%. Use the drawdown chart below to compare losses from any high point for SUB and FUMB.

Drawdown Indicators

	SUB	FUMB	Difference
Max Drawdown Largest peak-to-trough decline	-9.46%	-2.68%	-6.78%
Max Drawdown (1Y) Largest decline over 1 year	-0.81%	-0.22%	-0.59%
Max Drawdown (3Y) Largest decline over 3 years	-1.23%	-0.60%	-0.63%
Max Drawdown (5Y) Largest decline over 5 years	-4.35%	-1.25%	-3.10%
Max Drawdown (10Y) Largest decline over 10 years	-9.46%	—	—
Current Drawdown Current decline from peak	0.00%	-0.12%	+0.12%
Average Drawdown Average peak-to-trough decline	-0.91%	-0.19%	-0.72%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.28%	0.06%	+0.22%

Volatility

SUB vs. FUMB - Volatility Comparison

iShares Short-Term National Muni Bond ETF (SUB) has a higher volatility of 0.25% compared to First Trust Ultra Short Duration Municipal ETF (FUMB) at 0.20%. This indicates that SUB's price experiences larger fluctuations and is considered to be riskier than FUMB based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SUB	FUMB	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.25%	0.20%	+0.05%
Volatility (6M) Calculated over the trailing 6-month period	0.80%	0.54%	+0.26%
Volatility (1Y) Calculated over the trailing 1-year period	1.01%	0.77%	+0.24%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.64%	1.17%	+0.47%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	2.59%	1.76%	+0.83%

SUB vs. FUMB - Expense Ratio Comparison

SUB has a 0.07% expense ratio, which is lower than FUMB's 0.45% expense ratio.

Dividends

SUB vs. FUMB - Dividend Comparison

SUB's dividend yield for the trailing twelve months is around 2.52%, less than FUMB's 2.79% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FUMB First Trust Ultra Short Duration Municipal ETF	2.79%	2.90%	2.86%	2.24%	1.02%	0.43%	0.94%	1.74%	0.15%	0.00%	0.00%	0.00%
SUB iShares Short-Term National Muni Bond ETF	2.52%	2.42%	2.10%	1.73%	0.86%	0.72%	1.23%	1.58%	1.32%	0.95%	0.75%	0.77%

Frequently Asked Questions

Can I hold both SUB and FUMB in my portfolio?

SUB and FUMB have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SUB or FUMB?

SUB has higher volatility (0.25%) compared to FUMB (0.20%). In terms of maximum drawdown, SUB dropped -9.46% vs FUMB's -2.68%.

Which ETF is better, SUB or FUMB?

On 5-year performance, FUMB leads with 1.99% vs 1.50% for SUB. On fees, SUB is cheaper at 0.07% per year. Their volatility is very similar. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, SUB or FUMB?

Over the 5-year period, FUMB has performed better with a 1.99% return vs 1.50%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, SUB or FUMB?

SUB is cheaper with a 0.07% expense ratio, compared with 0.45% for FUMB.

Which ETF pays a higher dividend yield, SUB or FUMB?

FUMB has the higher dividend yield at 2.79%, compared with 2.52% for SUB.

What is the main difference between SUB and FUMB?

They also come from different issuers: iShares and First Trust. Their fees differ too: 0.07% for SUB and 0.45% for FUMB.

Which has better risk-adjusted returns?

FUMB currently has the higher Sharpe Ratio (3.52 vs 3.00), 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.