ISHYX vs. AHMFX

Last updated Jun 4, 2026

ISHYX (Invesco Short Duration High Yield Municipal Fund) and AHMFX (American High-Income Municipal Bond Fund Class F-2) are both High Yield Muni funds. Over the past 10 years, ISHYX returned 2.86%/yr vs 3.48%/yr for AHMFX. Their correlation of 0.83 suggests significant overlap in exposure. ISHYX charges 0.59%/yr vs 0.42%/yr for AHMFX.

Performance

ISHYX vs. AHMFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Invesco Short Duration High Yield Municipal Fund (ISHYX) and American High-Income Municipal Bond Fund Class F-2 (AHMFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with ISHYX having a 2.40% return and AHMFX slightly lower at 2.33%. Over the past 10 years, ISHYX has underperformed AHMFX with an annualized return of 2.86%, while AHMFX has yielded a comparatively higher 3.48% annualized return.

ISHYX

• 1D: 0.21%
• 1M: 0.71%
• YTD: 2.40%
• 6M: 3.01%
• 1Y: 7.06%
• 3Y*: 4.92%
• 5Y*: 1.74%
• 10Y*: 2.86%

AHMFX

• 1D: 0.19%
• 1M: 0.99%
• YTD: 2.33%
• 6M: 2.83%
• 1Y: 8.64%
• 3Y*: 6.40%
• 5Y*: 1.91%
• 10Y*: 3.48%

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

ISHYX vs. AHMFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ISHYX Invesco Short Duration High Yield Municipal Fund	2.40%	3.92%	6.43%	3.58%	-8.99%	5.96%	-0.31%	7.84%	2.27%	8.04%
AHMFX American High-Income Municipal Bond Fund Class F-2	2.33%	6.03%	6.45%	7.04%	-12.44%	5.49%	4.61%	9.12%	1.80%	9.09%

Correlation

The correlation between ISHYX and AHMFX is 0.84, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.84
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.87
Correlation (10Y) Calculated over the trailing 10-year period	0.83
Correlation (All Time) Calculated using the full available price history since Jan 5, 2016	0.83

The correlation between ISHYX and AHMFX has been stable across timeframes, ranging from 0.83 to 0.87 - a consistent structural relationship.

Return for Risk

ISHYX vs. AHMFX — Risk / Return Rank

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

ISHYX

ISHYX Risk / Return Rank: 88
ISHYX Sharpe Ratio Rank: 92
ISHYX Sortino Ratio Rank: 97
ISHYX Omega Ratio Rank: 96
ISHYX Calmar Ratio Rank: 82
ISHYX Martin Ratio Rank: 75

AHMFX

AHMFX Risk / Return Rank: 78
AHMFX Sharpe Ratio Rank: 86
AHMFX Sortino Ratio Rank: 92
AHMFX Omega Ratio Rank: 92
AHMFX Calmar Ratio Rank: 65
AHMFX Martin Ratio Rank: 55

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.

ISHYX vs. AHMFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Invesco Short Duration High Yield Municipal Fund (ISHYX) and American High-Income Municipal Bond Fund Class F-2 (AHMFX). 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.

	ISHYX	AHMFX	Difference
Sharpe ratio: Return per unit of total volatility	3.10	2.82	+0.28
Sortino ratio: Return per unit of downside risk	5.70	4.63	+1.08
Omega ratio: Gain probability vs. loss probability	1.87	1.69	+0.18
Calmar ratio: Return relative to maximum drawdown	3.77	3.12	+0.65
Martin ratio: Return relative to average drawdown	14.18	11.16	+3.01
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ISHYX vs. AHMFX - Sharpe Ratio Comparison

The current ISHYX Sharpe Ratio is 3.10, which is comparable to the AHMFX Sharpe Ratio of 2.82. The chart below compares the historical Sharpe Ratios of ISHYX and AHMFX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	ISHYX	AHMFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.10	2.82	+0.28
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.56	0.39	+0.17
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.86	0.77	+0.09
Sharpe Ratio (All Time) Calculated using the full available price history	0.95	1.54	-0.59

Drawdowns

ISHYX vs. AHMFX - Drawdown Comparison

The maximum ISHYX drawdown since its inception was -13.64%, smaller than the maximum AHMFX drawdown of -17.65%. Use the drawdown chart below to compare losses from any high point for ISHYX and AHMFX.

Drawdown Indicators

	ISHYX	AHMFX	Difference
Max Drawdown Largest peak-to-trough decline	-13.64%	-17.65%	+4.01%
Max Drawdown (1Y) Largest decline over 1 year	-1.89%	-2.76%	+0.87%
Max Drawdown (3Y) Largest decline over 3 years	-4.03%	-6.20%	+2.17%
Max Drawdown (5Y) Largest decline over 5 years	-12.03%	-17.65%	+5.62%
Max Drawdown (10Y) Largest decline over 10 years	-13.64%	-17.65%	+4.01%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-2.64%	-2.37%	-0.27%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.50%	0.77%	-0.27%

Volatility

ISHYX vs. AHMFX - Volatility Comparison

The current volatility for Invesco Short Duration High Yield Municipal Fund (ISHYX) is 0.87%, while American High-Income Municipal Bond Fund Class F-2 (AHMFX) has a volatility of 1.11%. This indicates that ISHYX experiences smaller price fluctuations and is considered to be less risky than AHMFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ISHYX	AHMFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.87%	1.11%	-0.24%
Volatility (6M) Calculated over the trailing 6-month period	1.75%	2.22%	-0.47%
Volatility (1Y) Calculated over the trailing 1-year period	2.31%	3.06%	-0.75%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	3.10%	4.86%	-1.76%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	3.33%	4.55%	-1.22%

ISHYX vs. AHMFX - Expense Ratio Comparison

ISHYX has a 0.59% expense ratio, which is higher than AHMFX's 0.42% expense ratio.

Dividends

ISHYX vs. AHMFX - Dividend Comparison

ISHYX's dividend yield for the trailing twelve months is around 4.64%, more than AHMFX's 4.12% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AHMFX American High-Income Municipal Bond Fund Class F-2	4.12%	5.58%	4.04%	2.97%	2.71%	3.44%	3.60%	3.68%	3.88%	4.19%	3.74%	4.19%
ISHYX Invesco Short Duration High Yield Municipal Fund	4.64%	4.65%	4.40%	3.38%	3.99%	3.58%	3.58%	3.45%	3.59%	3.51%	3.60%	0.00%

Frequently Asked Questions

Can I hold both ISHYX and AHMFX in my portfolio?

ISHYX and AHMFX have a correlation of 0.84, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ISHYX or AHMFX?

AHMFX has higher volatility (1.11%) compared to ISHYX (0.87%). In terms of maximum drawdown, ISHYX dropped -13.64% vs AHMFX's -17.65%.

Which has better risk-adjusted returns?

ISHYX currently has the higher Sharpe Ratio (3.10 vs 2.82), meaning it's delivered slightly more return per unit of risk over the trailing 12 months. However, this ranking shifts over time - use the Risk/Return Score above for a more comprehensive view that combines Sharpe, Sortino, and other measures used by quantitative funds.