ASTEX vs. DFCMX

Last updated Jun 3, 2026

ASTEX (American Funds Short-Term Tax Exempt Bond Fund) and DFCMX (DFA California Short Term Municipal Bond Portfolio) are both Municipal Bonds funds. Over the past 10 years, ASTEX returned 1.57%/yr vs 1.19%/yr for DFCMX. At a 0.35 correlation, their price movements are largely independent. ASTEX charges 0.53%/yr vs 0.19%/yr for DFCMX.

Performance

ASTEX vs. DFCMX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Short-Term Tax Exempt Bond Fund (ASTEX) and DFA California Short Term Municipal Bond Portfolio (DFCMX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ASTEX achieves a 0.90% return, which is significantly higher than DFCMX's 0.83% return. Over the past 10 years, ASTEX has outperformed DFCMX with an annualized return of 1.57%, while DFCMX has yielded a comparatively lower 1.19% annualized return.

ASTEX

• 1D: 0.00%
• 1M: 0.22%
• YTD: 0.90%
• 6M: 1.28%
• 1Y: 3.92%
• 3Y*: 3.76%
• 5Y*: 1.56%
• 10Y*: 1.57%

DFCMX

• 1D: 0.00%
• 1M: 0.19%
• YTD: 0.83%
• 6M: 1.04%
• 1Y: 2.60%
• 3Y*: 2.61%
• 5Y*: 1.54%
• 10Y*: 1.19%

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

ASTEX vs. DFCMX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ASTEX American Funds Short-Term Tax Exempt Bond Fund	0.90%	5.34%	2.46%	2.91%	-3.25%	-0.29%	2.91%	3.26%	0.94%	1.63%
DFCMX DFA California Short Term Municipal Bond Portfolio	0.83%	2.55%	2.84%	2.53%	-0.76%	-0.13%	0.67%	1.84%	1.24%	1.07%

Correlation

The correlation between ASTEX and DFCMX is 0.25, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.25
Correlation (3Y) Calculated over the trailing 3-year period	0.37
Correlation (5Y) Calculated over the trailing 5-year period	0.44
Correlation (10Y) Calculated over the trailing 10-year period	0.38
Correlation (All Time) Calculated using the full available price history since Aug 6, 2012	0.35

The correlation between ASTEX and DFCMX shifts across timeframes, from 0.25 (1 year) to 0.44 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

ASTEX vs. DFCMX — Risk / Return Rank

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

ASTEX

ASTEX Risk / Return Rank: 80
ASTEX Sharpe Ratio Rank: 87
ASTEX Sortino Ratio Rank: 95
ASTEX Omega Ratio Rank: 97
ASTEX Calmar Ratio Rank: 71
ASTEX Martin Ratio Rank: 52

DFCMX

DFCMX Risk / Return Rank: 99
DFCMX Sharpe Ratio Rank: 99
DFCMX Sortino Ratio Rank: 99
DFCMX Omega Ratio Rank: 100
DFCMX Calmar Ratio Rank: 99
DFCMX Martin Ratio Rank: 99

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.

ASTEX vs. DFCMX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Short-Term Tax Exempt Bond Fund (ASTEX) and DFA California Short Term Municipal Bond Portfolio (DFCMX). 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.

	ASTEX	DFCMX	Difference
Sharpe ratio Return per unit of total volatility	2.81	4.46	-1.65
Sortino ratio Return per unit of downside risk	5.08	10.44	-5.36
Omega ratio Gain probability vs. loss probability	1.95	4.85	-2.90
Calmar ratio Return relative to maximum drawdown	3.26	12.90	-9.64
Martin ratio Return relative to average drawdown	10.70	44.40	-33.70
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ASTEX vs. DFCMX - Sharpe Ratio Comparison

The current ASTEX Sharpe Ratio is 2.81, which is lower than the DFCMX Sharpe Ratio of 4.46. The chart below compares the historical Sharpe Ratios of ASTEX and DFCMX, 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

	ASTEX	DFCMX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.81	4.46	-1.65
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.89	1.73	-0.84
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.96	1.36	-0.40
Sharpe Ratio (All Time) Calculated using the full available price history	1.10	1.31	-0.21

Drawdowns

ASTEX vs. DFCMX - Drawdown Comparison

The maximum ASTEX drawdown since its inception was -5.73%, which is greater than DFCMX's maximum drawdown of -2.20%. Use the drawdown chart below to compare losses from any high point for ASTEX and DFCMX.

Drawdown Indicators

	ASTEX	DFCMX	Difference
Max Drawdown Largest peak-to-trough decline	-5.73%	-2.20%	-3.53%
Max Drawdown (1Y) Largest decline over 1 year	-1.28%	-0.20%	-1.08%
Max Drawdown (3Y) Largest decline over 3 years	-1.90%	-0.68%	-1.22%
Max Drawdown (5Y) Largest decline over 5 years	-5.62%	-2.20%	-3.42%
Max Drawdown (10Y) Largest decline over 10 years	-5.73%	-2.20%	-3.53%
Current Drawdown Current decline from peak	-0.41%	0.00%	-0.41%
Average Drawdown Average peak-to-trough decline	-0.70%	-0.26%	-0.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.39%	0.06%	+0.33%

Volatility

ASTEX vs. DFCMX - Volatility Comparison

American Funds Short-Term Tax Exempt Bond Fund (ASTEX) has a higher volatility of 0.46% compared to DFA California Short Term Municipal Bond Portfolio (DFCMX) at 0.13%. This indicates that ASTEX's price experiences larger fluctuations and is considered to be riskier than DFCMX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ASTEX	DFCMX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.46%	0.13%	+0.33%
Volatility (6M) Calculated over the trailing 6-month period	1.06%	0.41%	+0.65%
Volatility (1Y) Calculated over the trailing 1-year period	1.40%	0.59%	+0.81%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	1.77%	0.89%	+0.88%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	1.65%	0.88%	+0.77%

ASTEX vs. DFCMX - Expense Ratio Comparison

ASTEX has a 0.53% expense ratio, which is higher than DFCMX's 0.19% expense ratio.

Dividends

ASTEX vs. DFCMX - Dividend Comparison

ASTEX's dividend yield for the trailing twelve months is around 2.75%, more than DFCMX's 2.48% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ASTEX American Funds Short-Term Tax Exempt Bond Fund	2.75%	3.66%	2.53%	1.73%	0.78%	0.68%	1.31%	1.62%	1.44%	1.32%	0.97%	1.03%
DFCMX DFA California Short Term Municipal Bond Portfolio	2.48%	2.23%	2.61%	1.70%	0.71%	0.36%	0.87%	1.43%	1.04%	0.87%	0.86%	0.82%

Frequently Asked Questions

Can I hold both ASTEX and DFCMX in my portfolio?

ASTEX and DFCMX have a correlation of 0.25, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ASTEX or DFCMX?

ASTEX has higher volatility (0.46%) compared to DFCMX (0.13%). In terms of maximum drawdown, ASTEX dropped -5.73% vs DFCMX's -2.20%.

Which has better risk-adjusted returns?

DFCMX currently has the higher Sharpe Ratio (4.46 vs 2.81), 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.