DFABX vs. ATOIX

Last updated Apr 1, 2026

Compare and contrast key facts about DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) and abrdn Ultra Short Municipal Income Fund (ATOIX).

DFABX is managed by Dimensional. It was launched on Apr 11, 2022. ATOIX is managed by Aberdeen. It was launched on Dec 4, 2002.

Performance

DFABX vs. ATOIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) and abrdn Ultra Short Municipal Income Fund (ATOIX). The values are adjusted to include any dividend payments, if applicable.

DFABX vs. ATOIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
DFABX DFA Short-Term Selective State Municipal Bond Portfolio	0.58%	2.46%	2.90%	2.87%	0.55%
ATOIX abrdn Ultra Short Municipal Income Fund	0.35%	3.33%	3.14%	3.27%	1.15%

Returns By Period

In the year-to-date period, DFABX achieves a 0.58% return, which is significantly higher than ATOIX's 0.35% return.

DFABX

• 1D: 0.05%
• 1M: -0.05%
• YTD: 0.58%
• 6M: 1.12%
• 1Y: 2.73%
• 3Y*: 2.60%
• 5Y*: —
• 10Y*: —

ATOIX

• 1D: 0.00%
• 1M: -0.10%
• YTD: 0.35%
• 6M: 1.37%
• 1Y: 2.95%
• 3Y*: 3.07%
• 5Y*: 2.17%
• 10Y*: 1.73%

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

DFABX vs. ATOIX - Expense Ratio Comparison

DFABX has a 0.25% expense ratio, which is lower than ATOIX's 0.44% expense ratio.

ATOIX

abrdn Ultra Short Municipal Income Fund

DFABX

DFA Short-Term Selective State Municipal Bond Portfolio

Return for Risk

DFABX vs. ATOIX — Risk / Return Rank

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

DFABX

DFABX Risk / Return Rank: 99
DFABX Sharpe Ratio Rank: 99
DFABX Sortino Ratio Rank: 99
DFABX Omega Ratio Rank: 99
DFABX Calmar Ratio Rank: 98
DFABX Martin Ratio Rank: 99

ATOIX

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

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.

DFABX vs. ATOIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) and abrdn Ultra Short Municipal Income Fund (ATOIX). 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.

	DFABX	ATOIX	Difference
Sharpe ratio Return per unit of total volatility	3.90	3.51	+0.39
Sortino ratio Return per unit of downside risk	7.13	18.38	-11.25
Omega ratio Gain probability vs. loss probability	3.50	11.59	-8.09
Calmar ratio Return relative to maximum drawdown	4.84	32.23	-27.39
Martin ratio Return relative to average drawdown	26.76	93.42	-66.66
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

DFABX vs. ATOIX - Sharpe Ratio Comparison

The current DFABX Sharpe Ratio is 3.90, which is comparable to the ATOIX Sharpe Ratio of 3.51. The chart below compares the historical Sharpe Ratios of DFABX and ATOIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	DFABX	ATOIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.90	3.51	+0.39
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	2.69	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	2.24	—
Sharpe Ratio (All Time) Calculated using the full available price history	2.44	2.45	-0.01

Correlation

The correlation between DFABX and ATOIX is 0.01, which is considered to be low. This implies their price changes are not closely related. A low correlation is generally favorable for portfolio diversification, as it helps to reduce overall risk by spreading it across multiple assets with different performance patterns.

Dividends

DFABX vs. ATOIX - Dividend Comparison

DFABX's dividend yield for the trailing twelve months is around 2.70%, less than ATOIX's 2.90% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
DFABX DFA Short-Term Selective State Municipal Bond Portfolio	2.70%	2.33%	2.86%	2.52%	1.25%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
ATOIX abrdn Ultra Short Municipal Income Fund	2.90%	3.27%	3.09%	3.02%	1.07%	0.06%	0.88%	1.39%	1.42%	2.20%	0.61%	0.52%

Drawdowns

DFABX vs. ATOIX - Drawdown Comparison

The maximum DFABX drawdown since its inception was -2.46%, which is greater than ATOIX's maximum drawdown of -1.46%. Use the drawdown chart below to compare losses from any high point for DFABX and ATOIX.

Drawdown Indicators

	DFABX	ATOIX	Difference
Max Drawdown Largest peak-to-trough decline	-2.46%	-1.46%	-1.00%
Max Drawdown (1Y) Largest decline over 1 year	-0.50%	-0.10%	-0.40%
Max Drawdown (5Y) Largest decline over 5 years	—	-0.37%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-0.43%	—
Current Drawdown Current decline from peak	-0.06%	-0.10%	+0.04%
Average Drawdown Average peak-to-trough decline	-0.25%	-0.06%	-0.19%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.09%	0.03%	+0.06%

Volatility

DFABX vs. ATOIX - Volatility Comparison

DFA Short-Term Selective State Municipal Bond Portfolio (DFABX) has a higher volatility of 0.18% compared to abrdn Ultra Short Municipal Income Fund (ATOIX) at 0.10%. This indicates that DFABX's price experiences larger fluctuations and is considered to be riskier than ATOIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	DFABX	ATOIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.18%	0.10%	+0.08%
Volatility (6M) Calculated over the trailing 6-month period	0.40%	0.65%	-0.25%
Volatility (1Y) Calculated over the trailing 1-year period	0.71%	0.92%	-0.21%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	0.97%	0.81%	+0.16%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	0.97%	0.78%	+0.19%