AONIX vs. STDAX

Last updated Jun 4, 2026

AONIX (American Century Investments One Choice Portfolio: Very Conservative) and STDAX (SEI Asset Allocation Trust Defensive Strategy Allocation Fund) are both Diversified Portfolio funds. Over the past 10 years, AONIX returned 4.55%/yr vs 2.40%/yr for STDAX. A 0.68 correlation means they provide meaningful diversification when combined. AONIX charges 0.00%/yr vs 0.35%/yr for STDAX.

Performance

AONIX vs. STDAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Investments One Choice Portfolio: Very Conservative (AONIX) and SEI Asset Allocation Trust Defensive Strategy Allocation Fund (STDAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AONIX achieves a 2.84% return, which is significantly higher than STDAX's 1.30% return. Over the past 10 years, AONIX has outperformed STDAX with an annualized return of 4.55%, while STDAX has yielded a comparatively lower 2.40% annualized return.

AONIX

• 1D: 0.16%
• 1M: 1.25%
• YTD: 2.84%
• 6M: 2.77%
• 1Y: 8.41%
• 3Y*: 6.97%
• 5Y*: 2.86%
• 10Y*: 4.55%

STDAX

• 1D: 0.00%
• 1M: 0.36%
• YTD: 1.30%
• 6M: 1.61%
• 1Y: 3.99%
• 3Y*: 4.49%
• 5Y*: 2.89%
• 10Y*: 2.40%

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

AONIX vs. STDAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AONIX American Century Investments One Choice Portfolio: Very Conservative	2.84%	7.52%	5.92%	7.60%	-11.35%	6.63%	9.43%	11.96%	-0.93%	6.46%
STDAX SEI Asset Allocation Trust Defensive Strategy Allocation Fund	1.30%	4.46%	5.35%	4.45%	-1.58%	1.56%	-19.54%	19.83%	-3.32%	9.70%

Correlation

The correlation between AONIX and STDAX is 0.54, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.54
Correlation (3Y) Calculated over the trailing 3-year period	0.44
Correlation (5Y) Calculated over the trailing 5-year period	0.49
Correlation (10Y) Calculated over the trailing 10-year period	0.53
Correlation (All Time) Calculated using the full available price history since Oct 4, 2004	0.68

The correlation between AONIX and STDAX shifts across timeframes, from 0.44 (3 years) to 0.68 (all time), reflecting how their relationship changes across market environments.

Return for Risk

AONIX vs. STDAX — Risk / Return Rank

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

AONIX

AONIX Risk / Return Rank: 55
AONIX Sharpe Ratio Rank: 57
AONIX Sortino Ratio Rank: 60
AONIX Omega Ratio Rank: 60
AONIX Calmar Ratio Rank: 42
AONIX Martin Ratio Rank: 54

STDAX

STDAX Risk / Return Rank: 99
STDAX Sharpe Ratio Rank: 99
STDAX Sortino Ratio Rank: 99
STDAX Omega Ratio Rank: 99
STDAX Calmar Ratio Rank: 99
STDAX 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.

AONIX vs. STDAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Investments One Choice Portfolio: Very Conservative (AONIX) and SEI Asset Allocation Trust Defensive Strategy Allocation Fund (STDAX). 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.

	AONIX	STDAX	Difference
Sharpe ratio Return per unit of total volatility	2.22	4.78	-2.56
Sortino ratio Return per unit of downside risk	3.25	8.56	-5.31
Omega ratio Gain probability vs. loss probability	1.43	2.74	-1.31
Calmar ratio Return relative to maximum drawdown	2.46	11.47	-9.01
Martin ratio Return relative to average drawdown	10.95	48.94	-37.99
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AONIX vs. STDAX - Sharpe Ratio Comparison

The current AONIX Sharpe Ratio is 2.22, which is lower than the STDAX Sharpe Ratio of 4.78. The chart below compares the historical Sharpe Ratios of AONIX and STDAX, 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

	AONIX	STDAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.22	4.78	-2.56
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.53	1.48	-0.95
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.87	0.36	+0.51
Sharpe Ratio (All Time) Calculated using the full available price history	0.87	0.00	+0.87

Drawdowns

AONIX vs. STDAX - Drawdown Comparison

The maximum AONIX drawdown since its inception was -15.27%, smaller than the maximum STDAX drawdown of -76.81%. Use the drawdown chart below to compare losses from any high point for AONIX and STDAX.

Drawdown Indicators

	AONIX	STDAX	Difference
Max Drawdown Largest peak-to-trough decline	-15.27%	-76.81%	+61.54%
Max Drawdown (1Y) Largest decline over 1 year	-3.51%	-0.36%	-3.15%
Max Drawdown (3Y) Largest decline over 3 years	-5.08%	-1.68%	-3.40%
Max Drawdown (5Y) Largest decline over 5 years	-15.27%	-2.91%	-12.36%
Max Drawdown (10Y) Largest decline over 10 years	-15.27%	-26.89%	+11.62%
Current Drawdown Current decline from peak	0.00%	-8.71%	+8.71%
Average Drawdown Average peak-to-trough decline	-1.98%	-31.77%	+29.79%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.79%	0.08%	+0.71%

Volatility

AONIX vs. STDAX - Volatility Comparison

American Century Investments One Choice Portfolio: Very Conservative (AONIX) has a higher volatility of 1.32% compared to SEI Asset Allocation Trust Defensive Strategy Allocation Fund (STDAX) at 0.34%. This indicates that AONIX's price experiences larger fluctuations and is considered to be riskier than STDAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AONIX	STDAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.32%	0.34%	+0.98%
Volatility (6M) Calculated over the trailing 6-month period	3.06%	0.68%	+2.38%
Volatility (1Y) Calculated over the trailing 1-year period	3.90%	0.86%	+3.04%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.40%	1.96%	+3.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.25%	6.64%	-1.39%

AONIX vs. STDAX - Expense Ratio Comparison

AONIX has a 0.00% expense ratio, which is lower than STDAX's 0.35% expense ratio.

Dividends

AONIX vs. STDAX - Dividend Comparison

AONIX's dividend yield for the trailing twelve months is around 3.54%, less than STDAX's 4.56% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AONIX American Century Investments One Choice Portfolio: Very Conservative	3.54%	3.82%	3.10%	2.80%	7.19%	6.36%	3.46%	3.57%	5.83%	3.08%	2.16%	2.79%
STDAX SEI Asset Allocation Trust Defensive Strategy Allocation Fund	4.56%	4.49%	4.97%	4.77%	3.54%	0.87%	1.71%	5.19%	8.53%	6.92%	10.19%	3.84%

Frequently Asked Questions

Can I hold both AONIX and STDAX in my portfolio?

AONIX and STDAX have a correlation of 0.54, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AONIX or STDAX?

AONIX has higher volatility (1.32%) compared to STDAX (0.34%). In terms of maximum drawdown, AONIX dropped -15.27% vs STDAX's -76.81%.

Which has better risk-adjusted returns?

STDAX currently has the higher Sharpe Ratio (4.78 vs 2.22), 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.