PMIO vs. ZMUN

Last updated Jun 4, 2026

PMIO (PGIM Municipal Income Opportunities ETF) and ZMUN (F/m Ultrashort Tax-Free Municipal ETF) are both Municipal Bonds funds. PMIO is actively managed, while ZMUN is passively managed. At a 0.13 correlation, their price movements are largely independent. PMIO charges 0.25%/yr vs 0.30%/yr for ZMUN.

Performance

PMIO vs. ZMUN - Performance Comparison

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

Returns By Period

The year-to-date returns for both investments are quite close, with PMIO having a 1.54% return and ZMUN slightly higher at 1.57%.

PMIO

• 1D: -0.06%
• 1M: 0.84%
• YTD: 1.54%
• 6M: 1.81%
• 1Y: 6.80%
• 3Y*: —
• 5Y*: —
• 10Y*: —

ZMUN

• 1D: -0.02%
• 1M: 0.21%
• YTD: 1.57%
• 6M: 1.86%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

PMIO vs. ZMUN - Yearly Performance Comparison

	2026 (YTD)	2025
PMIO PGIM Municipal Income Opportunities ETF	1.54%	1.33%
ZMUN F/m Ultrashort Tax-Free Municipal ETF	1.57%	0.73%

Correlation

The correlation between PMIO and ZMUN is 0.13, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 1, 2025	0.13

Return for Risk

PMIO vs. ZMUN — Risk / Return Rank

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

PMIO

PMIO Risk / Return Rank: 79
PMIO Sharpe Ratio Rank: 89
PMIO Sortino Ratio Rank: 93
PMIO Omega Ratio Rank: 94
PMIO Calmar Ratio Rank: 62
PMIO Martin Ratio Rank: 58

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.

PMIO vs. ZMUN - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for PGIM Municipal Income Opportunities ETF (PMIO) 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.

	PMIO	ZMUN	Difference
Sharpe ratio: Return per unit of total volatility	3.04	—	—
Sortino ratio: Return per unit of downside risk	4.55	—	—
Omega ratio: Gain probability vs. loss probability	1.69	—	—
Calmar ratio: Return relative to maximum drawdown	3.05	—	—
Martin ratio: Return relative to average drawdown	10.15	—	—
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

	PMIO	ZMUN	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.04	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.57	6.46	-4.88

Drawdowns

PMIO vs. ZMUN - Drawdown Comparison

The maximum PMIO drawdown since its inception was -3.39%, which is greater than ZMUN's maximum drawdown of -0.09%. Use the drawdown chart below to compare losses from any high point for PMIO and ZMUN.

Drawdown Indicators

	PMIO	ZMUN	Difference
Max Drawdown Largest peak-to-trough decline	-3.39%	-0.09%	-3.30%
Max Drawdown (1Y) Largest decline over 1 year	-2.24%	—	—
Current Drawdown Current decline from peak	-0.47%	-0.02%	-0.45%
Average Drawdown Average peak-to-trough decline	-0.66%	-0.01%	-0.65%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.67%	—	—

Volatility

Volatility by Period

	PMIO	ZMUN	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.73%	—	—
Volatility (6M) Calculated over the trailing 6-month period	1.58%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	2.25%	0.54%	+1.71%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.08%	0.54%	+2.54%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.08%	0.54%	+2.54%

PMIO vs. ZMUN - Expense Ratio Comparison

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

Dividends

PMIO vs. ZMUN - Dividend Comparison

PMIO's dividend yield for the trailing twelve months is around 3.92%, more than ZMUN's 2.28% yield.

Position	TTM	2025	2024
PMIO PGIM Municipal Income Opportunities ETF	3.92%	4.00%	2.11%
ZMUN F/m Ultrashort Tax-Free Municipal ETF	2.28%	0.70%	0.00%

Frequently Asked Questions

Can I hold both PMIO and ZMUN in my portfolio?

PMIO and ZMUN have a correlation of 0.13, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, PMIO or ZMUN?

On fees, PMIO 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, PMIO or ZMUN?

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

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

PMIO has the higher dividend yield at 3.92%, compared with 2.28% for ZMUN.

What is the main difference between PMIO and ZMUN?

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