ZTAX vs. AMUN

Last updated Apr 1, 2026

Compare and contrast key facts about X-Square Municipal Income Tax Free ETF (ZTAX) and abrdn Ultra Short Municipal Income Active ETF (AMUN).

ZTAX and AMUN are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. ZTAX is an actively managed fund by X-Square. It was launched on May 18, 2023. AMUN is an actively managed fund by abrdn. It was launched on Oct 20, 2025.

Performance

ZTAX vs. AMUN - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in X-Square Municipal Income Tax Free ETF (ZTAX) and abrdn Ultra Short Municipal Income Active ETF (AMUN). The values are adjusted to include any dividend payments, if applicable.

ZTAX vs. AMUN - Yearly Performance Comparison

	2026 (YTD)	2025
ZTAX X-Square Municipal Income Tax Free ETF	0.90%	4.08%
AMUN abrdn Ultra Short Municipal Income Active ETF	0.54%	0.14%

Returns By Period

In the year-to-date period, ZTAX achieves a 0.90% return, which is significantly higher than AMUN's 0.54% return.

ZTAX

• 1D: -2.16%
• 1M: 1.00%
• YTD: 0.90%
• 6M: 4.68%
• 1Y: 5.44%
• 3Y*: —
• 5Y*: —
• 10Y*: —

AMUN

• 1D: 0.02%
• 1M: -0.04%
• YTD: 0.54%
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

ZTAX vs. AMUN - Expense Ratio Comparison

ZTAX has a 1.14% expense ratio, which is higher than AMUN's 0.25% expense ratio.

ZTAX

X-Square Municipal Income Tax Free ETF

AMUN

abrdn Ultra Short Municipal Income Active ETF

Return for Risk

ZTAX vs. AMUN — Risk / Return Rank

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

ZTAX

ZTAX Risk / Return Rank: 19
ZTAX Sharpe Ratio Rank: 17
ZTAX Sortino Ratio Rank: 18
ZTAX Omega Ratio Rank: 21
ZTAX Calmar Ratio Rank: 21
ZTAX Martin Ratio Rank: 20

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.

ZTAX vs. AMUN - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for X-Square Municipal Income Tax Free ETF (ZTAX) and abrdn Ultra Short Municipal Income Active ETF (AMUN). 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.

	ZTAX	AMUN	Difference
Sharpe ratio Return per unit of total volatility	0.21	—	—
Sortino ratio Return per unit of downside risk	0.49	—	—
Omega ratio Gain probability vs. loss probability	1.08	—	—
Calmar ratio Return relative to maximum drawdown	0.43	—	—
Martin ratio Return relative to average drawdown	1.15	—	—
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

	ZTAX	AMUN	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.21	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.22	1.39	-1.17

Correlation

The correlation between ZTAX and AMUN is -0.16. This indicates that the assets' prices tend to move in opposite directions. Negative correlation can be particularly beneficial for diversification and risk management, as one asset may offset the losses of the other during market fluctuations.

Dividends

ZTAX vs. AMUN - Dividend Comparison

ZTAX's dividend yield for the trailing twelve months is around 4.52%, more than AMUN's 1.14% yield.

	TTM	2025	2024	2023
ZTAX X-Square Municipal Income Tax Free ETF	4.52%	4.58%	4.55%	2.14%
AMUN abrdn Ultra Short Municipal Income Active ETF	1.14%	0.66%	0.00%	0.00%

Drawdowns

ZTAX vs. AMUN - Drawdown Comparison

The maximum ZTAX drawdown since its inception was -15.33%, which is greater than AMUN's maximum drawdown of -0.61%. Use the drawdown chart below to compare losses from any high point for ZTAX and AMUN.

Drawdown Indicators

	ZTAX	AMUN	Difference
Max Drawdown Largest peak-to-trough decline	-15.33%	-0.61%	-14.72%
Max Drawdown (1Y) Largest decline over 1 year	-10.47%	—	—
Current Drawdown Current decline from peak	-5.92%	-0.05%	-5.87%
Average Drawdown Average peak-to-trough decline	-6.88%	-0.11%	-6.77%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.91%	—	—

Volatility

Volatility by Period

	ZTAX	AMUN	Difference
Volatility (1M) Calculated over the trailing 1-month period	9.50%	—	—
Volatility (6M) Calculated over the trailing 6-month period	24.09%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	25.95%	1.12%	+24.83%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	27.27%	1.12%	+26.15%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	27.27%	1.12%	+26.15%