DDX vs. USAF

Last updated Apr 1, 2026

Compare and contrast key facts about Defined Duration 10 ETF (DDX) and Atlas America Fund (USAF).

DDX and USAF are both exchange-traded funds (ETFs), meaning they are traded on stock exchanges and can be bought and sold throughout the day. DDX is an actively managed fund by Discipline Funds. It was launched on Sep 21, 2021. USAF is an actively managed fund by Atlas. It was launched on Nov 19, 2024.

Performance

DDX vs. USAF - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Defined Duration 10 ETF (DDX) and Atlas America Fund (USAF). The values are adjusted to include any dividend payments, if applicable.

DDX vs. USAF - Yearly Performance Comparison

	2026 (YTD)	2025	2024
DDX Defined Duration 10 ETF	0.74%	12.02%	-0.90%
USAF Atlas America Fund	2.11%	9.09%	0.23%

Returns By Period

In the year-to-date period, DDX achieves a 0.74% return, which is significantly lower than USAF's 2.11% return.

DDX

• 1D: 1.02%
• 1M: -3.21%
• YTD: 0.74%
• 6M: 2.79%
• 1Y: 9.41%
• 3Y*: 6.77%
• 5Y*: —
• 10Y*: —

USAF

• 1D: 0.82%
• 1M: -2.75%
• YTD: 2.11%
• 6M: 2.70%
• 1Y: 7.94%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

DDX vs. USAF - Expense Ratio Comparison

DDX has a 0.25% expense ratio, which is lower than USAF's 0.89% expense ratio.

USAF

Atlas America Fund

DDX

Defined Duration 10 ETF

Return for Risk

DDX vs. USAF — Risk / Return Rank

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

DDX

DDX Risk / Return Rank: 79
DDX Sharpe Ratio Rank: 80
DDX Sortino Ratio Rank: 82
DDX Omega Ratio Rank: 77
DDX Calmar Ratio Rank: 79
DDX Martin Ratio Rank: 78

USAF

USAF Risk / Return Rank: 63
USAF Sharpe Ratio Rank: 67
USAF Sortino Ratio Rank: 62
USAF Omega Ratio Rank: 59
USAF Calmar Ratio Rank: 70
USAF Martin Ratio Rank: 56

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.

DDX vs. USAF - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Defined Duration 10 ETF (DDX) and Atlas America Fund (USAF). 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.

	DDX	USAF	Difference
Sharpe ratio Return per unit of total volatility	1.54	1.21	+0.33
Sortino ratio Return per unit of downside risk	2.17	1.62	+0.55
Omega ratio Gain probability vs. loss probability	1.30	1.22	+0.07
Calmar ratio Return relative to maximum drawdown	2.21	1.85	+0.37
Martin ratio Return relative to average drawdown	8.58	5.64	+2.94
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

DDX vs. USAF - Sharpe Ratio Comparison

The current DDX Sharpe Ratio is 1.54, which is comparable to the USAF Sharpe Ratio of 1.21. The chart below compares the historical Sharpe Ratios of DDX and USAF, 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

	DDX	USAF	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.54	1.21	+0.33
Sharpe Ratio (All Time) Calculated using the full available price history	0.26	1.45	-1.19

Correlation

The correlation between DDX and USAF is 0.30, 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

DDX vs. USAF - Dividend Comparison

DDX's dividend yield for the trailing twelve months is around 3.53%, more than USAF's 2.45% yield.

	TTM	2025	2024	2023	2022	2021
DDX Defined Duration 10 ETF	3.53%	3.17%	3.11%	2.41%	1.38%	1.14%
USAF Atlas America Fund	2.45%	2.50%	0.00%	0.00%	0.00%	0.00%

Drawdowns

DDX vs. USAF - Drawdown Comparison

The maximum DDX drawdown since its inception was -21.27%, which is greater than USAF's maximum drawdown of -4.46%. Use the drawdown chart below to compare losses from any high point for DDX and USAF.

Drawdown Indicators

	DDX	USAF	Difference
Max Drawdown Largest peak-to-trough decline	-21.27%	-4.46%	-16.81%
Max Drawdown (1Y) Largest decline over 1 year	-4.41%	-4.46%	+0.05%
Current Drawdown Current decline from peak	-3.21%	-3.38%	+0.17%
Average Drawdown Average peak-to-trough decline	-7.36%	-0.85%	-6.51%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.14%	1.46%	-0.32%

Volatility

DDX vs. USAF - Volatility Comparison

Defined Duration 10 ETF (DDX) has a higher volatility of 2.75% compared to Atlas America Fund (USAF) at 2.07%. This indicates that DDX's price experiences larger fluctuations and is considered to be riskier than USAF based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	DDX	USAF	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.75%	2.07%	+0.68%
Volatility (6M) Calculated over the trailing 6-month period	3.84%	5.31%	-1.47%
Volatility (1Y) Calculated over the trailing 1-year period	6.13%	6.58%	-0.45%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	7.50%	5.92%	+1.58%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	7.50%	5.92%	+1.58%