AHMFX vs. AMHIX

Last updated Jun 4, 2026

AHMFX (American High-Income Municipal Bond Fund Class F-2) and AMHIX (American High-Income Municipal Bond Fund) are both High Yield Muni funds. Over the past 10 years, AHMFX returned 3.48%/yr vs 3.29%/yr for AMHIX. With a 1.00 correlation, they move nearly in lockstep. AHMFX charges 0.42%/yr vs 0.63%/yr for AMHIX.

Performance

AHMFX vs. AMHIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American High-Income Municipal Bond Fund Class F-2 (AHMFX) and American High-Income Municipal Bond Fund (AMHIX). 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 AHMFX having a 2.33% return and AMHIX slightly lower at 2.23%. Over the past 10 years, AHMFX has outperformed AMHIX with an annualized return of 3.48%, while AMHIX has yielded a comparatively lower 3.29% annualized return.

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%

AMHIX

• 1D: 0.19%
• 1M: 0.97%
• YTD: 2.23%
• 6M: 2.71%
• 1Y: 8.39%
• 3Y*: 6.13%
• 5Y*: 1.74%
• 10Y*: 3.29%

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

AHMFX vs. AMHIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
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%
AMHIX American High-Income Municipal Bond Fund	2.23%	5.70%	6.19%	7.18%	-12.59%	5.28%	4.39%	8.88%	1.59%	8.89%

Correlation

The correlation between AHMFX and AMHIX is 1.00 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	1.00
Correlation (3Y) Calculated over the trailing 3-year period	1.00
Correlation (5Y) Calculated over the trailing 5-year period	1.00
Correlation (10Y) Calculated over the trailing 10-year period	1.00
Correlation (All Time) Calculated using the full available price history since Jan 5, 2009	1.00

The correlation between AHMFX and AMHIX has been stable across timeframes, ranging from 1.00 to 1.00 - a consistent structural relationship.

Return for Risk

AHMFX vs. AMHIX — Risk / Return Rank

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

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

AMHIX

AMHIX Risk / Return Rank: 76
AMHIX Sharpe Ratio Rank: 85
AMHIX Sortino Ratio Rank: 91
AMHIX Omega Ratio Rank: 91
AMHIX Calmar Ratio Rank: 62
AMHIX Martin Ratio Rank: 52

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.

AHMFX vs. AMHIX - Risk-Adjusted Trends Comparison

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

	AHMFX	AMHIX	Difference
Sharpe ratio Return per unit of total volatility	2.82	2.77	+0.06
Sortino ratio Return per unit of downside risk	4.63	4.49	+0.13
Omega ratio Gain probability vs. loss probability	1.69	1.67	+0.02
Calmar ratio Return relative to maximum drawdown	3.12	3.02	+0.09
Martin ratio Return relative to average drawdown	11.16	10.73	+0.44
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AHMFX vs. AMHIX - Sharpe Ratio Comparison

The current AHMFX Sharpe Ratio is 2.82, which is comparable to the AMHIX Sharpe Ratio of 2.77. The chart below compares the historical Sharpe Ratios of AHMFX and AMHIX, 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

	AHMFX	AMHIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.82	2.77	+0.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.39	0.36	+0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.77	0.73	+0.04
Sharpe Ratio (All Time) Calculated using the full available price history	1.54	1.40	+0.14

Drawdowns

AHMFX vs. AMHIX - Drawdown Comparison

The maximum AHMFX drawdown since its inception was -17.65%, smaller than the maximum AMHIX drawdown of -21.74%. Use the drawdown chart below to compare losses from any high point for AHMFX and AMHIX.

Drawdown Indicators

	AHMFX	AMHIX	Difference
Max Drawdown Largest peak-to-trough decline	-17.65%	-21.74%	+4.09%
Max Drawdown (1Y) Largest decline over 1 year	-2.76%	-2.76%	0.00%
Max Drawdown (3Y) Largest decline over 3 years	-6.20%	-6.25%	+0.05%
Max Drawdown (5Y) Largest decline over 5 years	-17.65%	-17.81%	+0.16%
Max Drawdown (10Y) Largest decline over 10 years	-17.65%	-17.81%	+0.16%
Current Drawdown Current decline from peak	0.00%	-0.02%	+0.02%
Average Drawdown Average peak-to-trough decline	-2.37%	-2.12%	-0.25%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.77%	0.78%	-0.01%

Volatility

AHMFX vs. AMHIX - Volatility Comparison

American High-Income Municipal Bond Fund Class F-2 (AHMFX) and American High-Income Municipal Bond Fund (AMHIX) have volatilities of 1.11% and 1.10%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AHMFX	AMHIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.11%	1.10%	+0.01%
Volatility (6M) Calculated over the trailing 6-month period	2.22%	2.20%	+0.02%
Volatility (1Y) Calculated over the trailing 1-year period	3.06%	3.03%	+0.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.86%	4.84%	+0.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.55%	4.53%	+0.02%

AHMFX vs. AMHIX - Expense Ratio Comparison

AHMFX has a 0.42% expense ratio, which is lower than AMHIX's 0.63% expense ratio.

Dividends

AHMFX vs. AMHIX - Dividend Comparison

AHMFX's dividend yield for the trailing twelve months is around 4.12%, more than AMHIX's 3.88% 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%
AMHIX American High-Income Municipal Bond Fund	3.88%	5.26%	3.80%	3.10%	2.53%	3.23%	3.40%	3.46%	3.67%	4.01%	3.55%	4.03%

Frequently Asked Questions

Can I hold both AHMFX and AMHIX in my portfolio?

With a correlation of 1.00, AHMFX and AMHIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, AHMFX or AMHIX?

AHMFX has higher volatility (1.11%) compared to AMHIX (1.10%). In terms of maximum drawdown, AHMFX dropped -17.65% vs AMHIX's -21.74%.

Which has better risk-adjusted returns?

AHMFX currently has the higher Sharpe Ratio (2.82 vs 2.77), 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.