ZMUN vs. AUSM

Last updated Jul 12, 2026

ZMUN (F/m Ultrashort Tax-Free Municipal ETF) and AUSM (Allspring Ultra Short Municipal ETF) are both Municipal Bonds funds. ZMUN is passively managed, while AUSM is actively managed. At a correlation of -0.03, they often move in opposite directions. ZMUN charges 0.30%/yr vs 0.18%/yr for AUSM.

Performance

ZMUN vs. AUSM - Performance Comparison

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

Returns By Period

In the year-to-date period, ZMUN achieves a 1.88% return, which is significantly higher than AUSM's 1.34% return.

ZMUN

• 1D: 0.05%
• 1M: 0.20%
• 6M: 1.76%
• YTD: 1.88%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

AUSM

• 1D: 0.04%
• 1M: 0.22%
• 6M: 1.20%
• YTD: 1.34%
• 1Y: 2.89%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

ZMUN vs. AUSM - Yearly Performance Comparison

	2026 (YTD)	2025
ZMUN F/m Ultrashort Tax-Free Municipal ETF	1.88%	0.67%
AUSM Allspring Ultra Short Municipal ETF	1.34%	0.74%

Correlation

The correlation between ZMUN and AUSM is -0.03, 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 Sep 30, 2025	-0.03

Return for Risk

ZMUN vs. AUSM — Risk / Return Rank

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

ZMUN

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

AUSM

AUSM Risk / Return Rank: 97
AUSM Sharpe Ratio Rank: 98
AUSM Sortino Ratio Rank: 98
AUSM Omega Ratio Rank: 98
AUSM Calmar Ratio Rank: 96
AUSM Martin Ratio Rank: 94

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.

ZMUN vs. AUSM - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for F/m Ultrashort Tax-Free Municipal ETF (ZMUN) and Allspring Ultra Short Municipal ETF (AUSM). 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.

	ZMUN	AUSM	Difference
Sharpe ratio: Return per unit of total volatility	—	4.03	—
Sortino ratio: Return per unit of downside risk	—	7.00	—
Omega ratio: Gain probability vs. loss probability	—	2.29	—
Calmar ratio: Return relative to maximum drawdown	—	7.09	—
Martin ratio: Return relative to average drawdown	—	20.97	—

Drawdowns

ZMUN vs. AUSM - Drawdown Comparison

The maximum ZMUN drawdown since its inception was -0.13%, smaller than the maximum AUSM drawdown of -0.42%. Use the drawdown chart below to compare losses from any high point for ZMUN and AUSM.

Drawdown Indicators

	ZMUN	AUSM	Difference
Max Drawdown Largest peak-to-trough decline	-0.13%	-0.42%	+0.29%
Max Drawdown (1Y) Largest decline over 1 year	—	-0.42%	—
Current Drawdown Current decline from peak	-0.07%	-0.00%	-0.07%
Average Drawdown Average peak-to-trough decline	-0.02%	-0.08%	+0.06%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.14%	—

Volatility

Volatility by Period

	ZMUN	AUSM	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	0.23%	—
Volatility (6M) Calculated over the trailing 6-month period	—	0.45%	—
Volatility (1Y) Calculated over the trailing 1-year period	0.54%	0.74%	-0.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.54%	0.73%	-0.19%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.54%	0.73%	-0.19%

ZMUN vs. AUSM - Expense Ratio Comparison

ZMUN has a 0.30% expense ratio, which is higher than AUSM's 0.18% expense ratio.

Dividends

ZMUN vs. AUSM - Dividend Comparison

ZMUN's dividend yield for the trailing twelve months is around 2.60%, which matches AUSM's 2.61% yield.

Position	TTM	2025
AUSM Allspring Ultra Short Municipal ETF	2.61%	1.26%
ZMUN F/m Ultrashort Tax-Free Municipal ETF	2.60%	0.70%

Frequently Asked Questions

Can I hold both ZMUN and AUSM in my portfolio?

ZMUN and AUSM have a correlation of -0.03, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, ZMUN or AUSM?

On fees, AUSM is cheaper at 0.18% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, ZMUN or AUSM?

AUSM is cheaper with a 0.18% expense ratio, compared with 0.30% for ZMUN.

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

AUSM has the higher dividend yield at 2.61%, compared with 2.60% for ZMUN.

What is the main difference between ZMUN and AUSM?

They also come from different issuers: F/m Investments and Allspring. Their fees differ too: 0.30% for ZMUN and 0.18% for AUSM.