SDLAX vs. SPIIX

Last updated Jun 5, 2026

SDLAX (SEI Institutional Investments Trust Dynamic Asset Allocation Fund) and SPIIX (SEI S&P 500 Index Fund Class I) are both Large Cap Blend Equities funds from SEI. Over the past 10 years, SDLAX returned 15.28%/yr vs 14.81%/yr for SPIIX. With a 0.96 correlation, they move nearly in lockstep. SDLAX charges 0.67%/yr vs 0.65%/yr for SPIIX.

Performance

SDLAX vs. SPIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SEI Institutional Investments Trust Dynamic Asset Allocation Fund (SDLAX) and SEI S&P 500 Index Fund Class I (SPIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SDLAX achieves a 9.83% return, which is significantly lower than SPIIX's 10.51% return. Both investments have delivered pretty close results over the past 10 years, with SDLAX having a 15.28% annualized return and SPIIX not far behind at 14.81%.

SDLAX

• 1D: -0.85%
• 1M: 3.86%
• YTD: 9.83%
• 6M: 9.63%
• 1Y: 27.42%
• 3Y*: 22.16%
• 5Y*: 13.71%
• 10Y*: 15.28%

SPIIX

• 1D: -0.74%
• 1M: 4.10%
• YTD: 10.51%
• 6M: 10.27%
• 1Y: 27.01%
• 3Y*: 21.57%
• 5Y*: 13.09%
• 10Y*: 14.81%

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

SDLAX vs. SPIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SDLAX SEI Institutional Investments Trust Dynamic Asset Allocation Fund	9.83%	20.37%	24.23%	22.00%	-16.10%	31.43%	20.70%	27.68%	-7.77%	19.77%
SPIIX SEI S&P 500 Index Fund Class I	10.51%	16.97%	24.11%	25.49%	-18.84%	28.04%	17.66%	30.72%	-5.00%	21.06%

Correlation

The correlation between SDLAX and SPIIX is 0.99 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.99
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.98
Correlation (All Time) Calculated using the full available price history since Jan 4, 2011	0.96

The correlation between SDLAX and SPIIX has been stable across timeframes, ranging from 0.96 to 0.99 - a consistent structural relationship.

Return for Risk

SDLAX vs. SPIIX — Risk / Return Rank

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

SDLAX

SDLAX Risk / Return Rank: 56
SDLAX Sharpe Ratio Rank: 54
SDLAX Sortino Ratio Rank: 51
SDLAX Omega Ratio Rank: 52
SDLAX Calmar Ratio Rank: 55
SDLAX Martin Ratio Rank: 68

SPIIX

SPIIX Risk / Return Rank: 63
SPIIX Sharpe Ratio Rank: 61
SPIIX Sortino Ratio Rank: 57
SPIIX Omega Ratio Rank: 58
SPIIX Calmar Ratio Rank: 63
SPIIX Martin Ratio Rank: 75

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.

SDLAX vs. SPIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SEI Institutional Investments Trust Dynamic Asset Allocation Fund (SDLAX) and SEI S&P 500 Index Fund Class I (SPIIX). 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.

	SDLAX	SPIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.18	2.29	-0.11
Sortino ratio: Return per unit of downside risk	3.00	3.13	-0.13
Omega ratio: Gain probability vs. loss probability	1.39	1.42	-0.02
Calmar ratio: Return relative to maximum drawdown	2.82	3.01	-0.19
Martin ratio: Return relative to average drawdown	13.05	13.94	-0.89
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SDLAX vs. SPIIX - Sharpe Ratio Comparison

The current SDLAX Sharpe Ratio is 2.18, which is comparable to the SPIIX Sharpe Ratio of 2.29. The chart below compares the historical Sharpe Ratios of SDLAX and SPIIX, 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

	SDLAX	SPIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.18	2.29	-0.11
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.53	0.71	-0.18
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.68	0.79	-0.11
Sharpe Ratio (All Time) Calculated using the full available price history	0.69	0.57	+0.12

Drawdowns

SDLAX vs. SPIIX - Drawdown Comparison

The maximum SDLAX drawdown since its inception was -35.25%, smaller than the maximum SPIIX drawdown of -55.78%. Use the drawdown chart below to compare losses from any high point for SDLAX and SPIIX.

Drawdown Indicators

	SDLAX	SPIIX	Difference
Max Drawdown Largest peak-to-trough decline	-35.25%	-55.78%	+20.53%
Max Drawdown (1Y) Largest decline over 1 year	-9.76%	-9.02%	-0.74%
Max Drawdown (3Y) Largest decline over 3 years	-35.25%	-25.70%	-9.55%
Max Drawdown (5Y) Largest decline over 5 years	-35.25%	-25.70%	-9.55%
Max Drawdown (10Y) Largest decline over 10 years	-35.25%	-33.85%	-1.40%
Current Drawdown Current decline from peak	-0.85%	-0.74%	-0.11%
Average Drawdown Average peak-to-trough decline	-5.73%	-7.28%	+1.55%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.10%	1.94%	+0.16%

Volatility

SDLAX vs. SPIIX - Volatility Comparison

SEI Institutional Investments Trust Dynamic Asset Allocation Fund (SDLAX) has a higher volatility of 3.57% compared to SEI S&P 500 Index Fund Class I (SPIIX) at 2.92%. This indicates that SDLAX's price experiences larger fluctuations and is considered to be riskier than SPIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SDLAX	SPIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.57%	2.92%	+0.65%
Volatility (6M) Calculated over the trailing 6-month period	9.80%	8.96%	+0.84%
Volatility (1Y) Calculated over the trailing 1-year period	12.63%	11.86%	+0.77%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	26.04%	18.44%	+7.60%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.70%	18.87%	+3.83%

SDLAX vs. SPIIX - Expense Ratio Comparison

SDLAX has a 0.67% expense ratio, which is higher than SPIIX's 0.65% expense ratio.

Dividends

SDLAX vs. SPIIX - Dividend Comparison

SDLAX's dividend yield for the trailing twelve months is around 12.57%, more than SPIIX's 7.62% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SDLAX SEI Institutional Investments Trust Dynamic Asset Allocation Fund	12.57%	13.81%	32.97%	12.32%	14.88%	17.50%	12.09%	12.85%	1.86%	3.79%	1.60%	6.89%
SPIIX SEI S&P 500 Index Fund Class I	7.62%	8.42%	12.20%	4.10%	10.27%	7.03%	5.78%	4.04%	3.90%	2.08%	4.34%	1.53%

Frequently Asked Questions

Can I hold both SDLAX and SPIIX in my portfolio?

With a correlation of 0.99, SDLAX and SPIIX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, SDLAX or SPIIX?

SDLAX has higher volatility (3.57%) compared to SPIIX (2.92%). In terms of maximum drawdown, SDLAX dropped -35.25% vs SPIIX's -55.78%.

Which has better risk-adjusted returns?

SPIIX currently has the higher Sharpe Ratio (2.29 vs 2.18), 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.