CGSM vs. ZMUN

Last updated Jun 5, 2026

CGSM (Capital Group Short Duration Municipal Income ETF) and ZMUN (F/m Ultrashort Tax-Free Municipal ETF) are both Municipal Bonds funds. CGSM is actively managed, while ZMUN is passively managed. At a 0.00 correlation, their price movements are largely independent. CGSM charges 0.25%/yr vs 0.30%/yr for ZMUN.

Performance

CGSM vs. ZMUN - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Capital Group Short Duration Municipal Income ETF (CGSM) and F/m Ultrashort Tax-Free Municipal ETF (ZMUN). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, CGSM achieves a 1.37% return, which is significantly lower than ZMUN's 1.61% return.

CGSM

• 1D: 0.08%
• 1M: 0.46%
• YTD: 1.37%
• 6M: 1.64%
• 1Y: 4.67%
• 3Y*: —
• 5Y*: —
• 10Y*: —

ZMUN

• 1D: 0.04%
• 1M: 0.31%
• YTD: 1.61%
• 6M: 1.88%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

CGSM vs. ZMUN - Yearly Performance Comparison

	2026 (YTD)	2025
CGSM Capital Group Short Duration Municipal Income ETF	1.37%	0.73%
ZMUN F/m Ultrashort Tax-Free Municipal ETF	1.61%	0.73%

Correlation

The correlation between CGSM and ZMUN is 0.00, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 1, 2025	0.00

Return for Risk

CGSM vs. ZMUN — Risk / Return Rank

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

CGSM

CGSM Risk / Return Rank: 87
CGSM Sharpe Ratio Rank: 94
CGSM Sortino Ratio Rank: 96
CGSM Omega Ratio Rank: 96
CGSM Calmar Ratio Rank: 79
CGSM Martin Ratio Rank: 71

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.

CGSM vs. ZMUN - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Capital Group Short Duration Municipal Income ETF (CGSM) and F/m Ultrashort Tax-Free Municipal ETF (ZMUN). 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.

	CGSM	ZMUN	Difference
Sharpe ratio: Return per unit of total volatility	3.52	—	—
Sortino ratio: Return per unit of downside risk	5.44	—	—
Omega ratio: Gain probability vs. loss probability	1.82	—	—
Calmar ratio: Return relative to maximum drawdown	3.98	—	—
Martin ratio: Return relative to average drawdown	13.02	—	—
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

Sharpe Ratios by Period

	CGSM	ZMUN	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.52	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.89	6.54	-3.65

Drawdowns

CGSM vs. ZMUN - Drawdown Comparison

The maximum CGSM drawdown since its inception was -1.42%, which is greater than ZMUN's maximum drawdown of -0.09%. Use the drawdown chart below to compare losses from any high point for CGSM and ZMUN.

Drawdown Indicators

	CGSM	ZMUN	Difference
Max Drawdown Largest peak-to-trough decline	-1.42%	-0.09%	-1.33%
Max Drawdown (1Y) Largest decline over 1 year	-1.18%	—	—
Current Drawdown Current decline from peak	-0.14%	0.00%	-0.14%
Average Drawdown Average peak-to-trough decline	-0.24%	-0.01%	-0.23%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.36%	—	—

Volatility

Volatility by Period

	CGSM	ZMUN	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.43%	—	—
Volatility (6M) Calculated over the trailing 6-month period	0.98%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	1.33%	0.54%	+0.79%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.79%	0.54%	+1.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.79%	0.54%	+1.25%

CGSM vs. ZMUN - Expense Ratio Comparison

CGSM has a 0.25% expense ratio, which is lower than ZMUN's 0.30% expense ratio.

Dividends

CGSM vs. ZMUN - Dividend Comparison

CGSM's dividend yield for the trailing twelve months is around 2.99%, more than ZMUN's 2.28% yield.

Position	TTM	2025	2024	2023
CGSM Capital Group Short Duration Municipal Income ETF	2.99%	3.05%	3.11%	0.84%
ZMUN F/m Ultrashort Tax-Free Municipal ETF	2.28%	0.70%	0.00%	0.00%

Frequently Asked Questions

Can I hold both CGSM and ZMUN in my portfolio?

CGSM and ZMUN have a correlation of 0.00, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, CGSM or ZMUN?

On fees, CGSM is cheaper at 0.25% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, CGSM or ZMUN?

CGSM is cheaper with a 0.25% expense ratio, compared with 0.30% for ZMUN.

Which ETF pays a higher dividend yield, CGSM or ZMUN?

CGSM has the higher dividend yield at 2.99%, compared with 2.28% for ZMUN.

What is the main difference between CGSM and ZMUN?

They also come from different issuers: Capital Group and F/m Investments. Their fees differ too: 0.25% for CGSM and 0.30% for ZMUN.