USAF vs. DDX

Last updated Jun 3, 2026

USAF (Atlas America Fund) and DDX (Defined Duration 10 ETF) are both Diversified Portfolio funds. Both are actively managed. Over the past year, USAF returned 6.27% vs 13.15% for DDX. At a 0.29 correlation, their price movements are largely independent. USAF charges 0.89%/yr vs 0.25%/yr for DDX.

Performance

USAF vs. DDX - Performance Comparison

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

Returns By Period

In the year-to-date period, USAF achieves a 2.46% return, which is significantly lower than DDX's 5.11% return.

USAF

• 1D: -0.04%
• 1M: -0.31%
• YTD: 2.46%
• 6M: 3.19%
• 1Y: 6.27%
• 3Y*: —
• 5Y*: —
• 10Y*: —

DDX

• 1D: 0.36%
• 1M: 1.72%
• YTD: 5.11%
• 6M: 5.95%
• 1Y: 13.15%
• 3Y*: 8.24%
• 5Y*: —
• 10Y*: —

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

USAF vs. DDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024
USAF Atlas America Fund	2.46%	9.09%	0.23%
DDX Defined Duration 10 ETF	5.11%	12.02%	-0.90%

Correlation

The correlation between USAF and DDX is 0.35, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.35
Correlation (All Time) Calculated using the full available price history since Nov 21, 2024	0.29

Return for Risk

USAF vs. DDX — Risk / Return Rank

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

USAF

USAF Risk / Return Rank: 28
USAF Sharpe Ratio Rank: 29
USAF Sortino Ratio Rank: 26
USAF Omega Ratio Rank: 29
USAF Calmar Ratio Rank: 31
USAF Martin Ratio Rank: 27

DDX

DDX Risk / Return Rank: 70
DDX Sharpe Ratio Rank: 72
DDX Sortino Ratio Rank: 78
DDX Omega Ratio Rank: 76
DDX Calmar Ratio Rank: 59
DDX Martin Ratio Rank: 64

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.

USAF vs. DDX - Risk-Adjusted Trends Comparison

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

	USAF	DDX	Difference
Sharpe ratio Return per unit of total volatility	1.05	2.42	-1.37
Sortino ratio Return per unit of downside risk	1.40	3.59	-2.19
Omega ratio Gain probability vs. loss probability	1.20	1.46	-0.26
Calmar ratio Return relative to maximum drawdown	1.55	2.98	-1.43
Martin ratio Return relative to average drawdown	3.74	12.00	-8.27
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

USAF vs. DDX - Sharpe Ratio Comparison

The current USAF Sharpe Ratio is 1.05, which is lower than the DDX Sharpe Ratio of 2.42. The chart below compares the historical Sharpe Ratios of USAF and DDX, 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

	USAF	DDX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.05	2.42	-1.37
Sharpe Ratio (All Time) Calculated using the full available price history	1.37	0.37	+1.00

Drawdowns

USAF vs. DDX - Drawdown Comparison

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

Drawdown Indicators

	USAF	DDX	Difference
Max Drawdown Largest peak-to-trough decline	-4.46%	-21.27%	+16.81%
Max Drawdown (1Y) Largest decline over 1 year	-4.46%	-4.41%	-0.05%
Max Drawdown (3Y) Largest decline over 3 years	—	-6.17%	—
Current Drawdown Current decline from peak	-3.05%	0.00%	-3.05%
Average Drawdown Average peak-to-trough decline	-1.08%	-7.13%	+6.05%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.85%	1.09%	+0.76%

Volatility

USAF vs. DDX - Volatility Comparison

The current volatility for Atlas America Fund (USAF) is 1.02%, while Defined Duration 10 ETF (DDX) has a volatility of 2.10%. This indicates that USAF experiences smaller price fluctuations and is considered to be less risky than DDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	USAF	DDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.02%	2.10%	-1.08%
Volatility (6M) Calculated over the trailing 6-month period	4.73%	4.46%	+0.27%
Volatility (1Y) Calculated over the trailing 1-year period	6.01%	5.46%	+0.55%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.69%	7.48%	-1.79%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.69%	7.48%	-1.79%

USAF vs. DDX - Expense Ratio Comparison

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

Dividends

USAF vs. DDX - Dividend Comparison

USAF's dividend yield for the trailing twelve months is around 2.44%, less than DDX's 3.38% yield.

Position	TTM	2025	2024	2023	2022	2021
DDX Defined Duration 10 ETF	3.38%	3.17%	3.11%	2.41%	1.38%	1.14%
USAF Atlas America Fund	2.44%	2.50%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both USAF and DDX in my portfolio?

USAF and DDX have a correlation of 0.35, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, USAF or DDX?

DDX has higher volatility (2.10%) compared to USAF (1.02%). In terms of maximum drawdown, USAF dropped -4.46% vs DDX's -21.27%.

Which ETF is better, USAF or DDX?

On 1-year performance, DDX leads with 13.15% vs 6.27% for USAF. On fees, DDX is cheaper at 0.25% per year. On volatility, USAF has been the lower-risk option at 1.02%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, USAF or DDX?

Over the 1-year period, DDX has performed better with a 13.15% return vs 6.27%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, USAF or DDX?

DDX is cheaper with a 0.25% expense ratio, compared with 0.89% for USAF.

Which ETF pays a higher dividend yield, USAF or DDX?

DDX has the higher dividend yield at 3.38%, compared with 2.44% for USAF.

What is the main difference between USAF and DDX?

They also come from different issuers: Atlas and Discipline Funds. Their fees differ too: 0.89% for USAF and 0.25% for DDX.

Which has better risk-adjusted returns?

DDX currently has the higher Sharpe Ratio (2.42 vs 1.05), 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.