MUNX vs. MFLX

Last updated Jun 7, 2026

MUNX (AMG GW&K Muni Income ETF) and MFLX (First Trust Flexible Municipal High Income ETF) are both Municipal Bonds funds. Both are actively managed. A 0.53 correlation means they provide meaningful diversification when combined. MUNX charges 0.29%/yr vs 0.88%/yr for MFLX.

Performance

MUNX vs. MFLX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG GW&K Muni Income ETF (MUNX) and First Trust Flexible Municipal High Income ETF (MFLX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MUNX achieves a 1.74% return, which is significantly lower than MFLX's 3.15% return.

MUNX

• 1D: -0.25%
• 1M: 0.36%
• YTD: 1.74%
• 6M: 1.97%
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

MFLX

• 1D: -0.23%
• 1M: 0.62%
• YTD: 3.15%
• 6M: 3.63%
• 1Y: 9.10%
• 3Y*: 5.61%
• 5Y*: -0.06%
• 10Y*: —

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

MUNX vs. MFLX - Yearly Performance Comparison

	2026 (YTD)	2025
MUNX AMG GW&K Muni Income ETF	1.74%	0.52%
MFLX First Trust Flexible Municipal High Income ETF	3.15%	0.18%

Correlation

The correlation between MUNX and MFLX is 0.53, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (All Time) Calculated using the full available price history since Oct 31, 2025	0.53

Return for Risk

MUNX vs. MFLX — Risk / Return Rank

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

MFLX

MFLX Risk / Return Rank: 71
MFLX Sharpe Ratio Rank: 70
MFLX Sortino Ratio Rank: 78
MFLX Omega Ratio Rank: 81
MFLX Calmar Ratio Rank: 60
MFLX Martin Ratio Rank: 66

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.

MUNX vs. MFLX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG GW&K Muni Income ETF (MUNX) and First Trust Flexible Municipal High Income ETF (MFLX). 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.

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

Sharpe Ratios by Period

	MUNX	MFLX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	—	2.14	—
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	-0.01	—
Sharpe Ratio (All Time) Calculated using the full available price history	1.12	0.19	+0.93

Drawdowns

MUNX vs. MFLX - Drawdown Comparison

The maximum MUNX drawdown since its inception was -2.95%, smaller than the maximum MFLX drawdown of -26.76%. Use the drawdown chart below to compare losses from any high point for MUNX and MFLX.

Drawdown Indicators

	MUNX	MFLX	Difference
Max Drawdown Largest peak-to-trough decline	-2.95%	-26.76%	+23.81%
Max Drawdown (1Y) Largest decline over 1 year	—	-3.11%	—
Max Drawdown (3Y) Largest decline over 3 years	—	-8.18%	—
Max Drawdown (5Y) Largest decline over 5 years	—	-25.88%	—
Current Drawdown Current decline from peak	-0.50%	-3.95%	+3.45%
Average Drawdown Average peak-to-trough decline	-0.64%	-8.17%	+7.53%
Ulcer Index Depth and duration of drawdowns from previous peaks	—	0.77%	—

Volatility

Volatility by Period

	MUNX	MFLX	Difference
Volatility (1M) Calculated over the trailing 1-month period	—	1.36%	—
Volatility (6M) Calculated over the trailing 6-month period	—	2.99%	—
Volatility (1Y) Calculated over the trailing 1-year period	3.47%	4.09%	-0.62%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.47%	10.35%	-6.88%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.47%	11.29%	-7.82%

MUNX vs. MFLX - Expense Ratio Comparison

MUNX has a 0.29% expense ratio, which is lower than MFLX's 0.88% expense ratio.

Dividends

MUNX vs. MFLX - Dividend Comparison

MUNX's dividend yield for the trailing twelve months is around 1.95%, less than MFLX's 4.08% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016
MFLX First Trust Flexible Municipal High Income ETF	4.08%	4.06%	3.81%	3.65%	4.27%	3.69%	3.21%	2.94%	3.74%	3.80%	0.98%
MUNX AMG GW&K Muni Income ETF	1.95%	0.55%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both MUNX and MFLX in my portfolio?

MUNX and MFLX have a correlation of 0.53, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which ETF is better, MUNX or MFLX?

On fees, MUNX is cheaper at 0.29% per year. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF is cheaper, MUNX or MFLX?

MUNX is cheaper with a 0.29% expense ratio, compared with 0.88% for MFLX.

Which ETF pays a higher dividend yield, MUNX or MFLX?

MFLX has the higher dividend yield at 4.08%, compared with 1.95% for MUNX.

What is the main difference between MUNX and MFLX?

They also come from different issuers: AMG and First Trust. Their fees differ too: 0.29% for MUNX and 0.88% for MFLX.