SPIIX vs. SDLAX

Last updated Jun 24, 2026

SPIIX (SEI S&P 500 Index Fund Class I) and SDLAX (SEI Institutional Investments Trust Dynamic Asset Allocation Fund) are both Large Cap Blend Equities funds from SEI. Over the past 10 years, SPIIX returned 15.03%/yr vs 15.45%/yr for SDLAX. With a 0.96 correlation, they move nearly in lockstep. SPIIX charges 0.65%/yr vs 0.67%/yr for SDLAX.

Performance

SPIIX vs. SDLAX - Performance Comparison

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

Returns By Period

In the year-to-date period, SPIIX achieves a 9.38% return, which is significantly higher than SDLAX's 8.32% return. Both investments have delivered pretty close results over the past 10 years, with SPIIX having a 15.03% annualized return and SDLAX not far ahead at 15.45%.

SPIIX

• 1D: -0.37%
• 1M: 0.04%
• YTD: 9.38%
• 6M: 8.37%
• 1Y: 24.51%
• 3Y*: 20.52%
• 5Y*: 12.80%
• 10Y*: 15.03%

SDLAX

• 1D: -0.43%
• 1M: -0.19%
• YTD: 8.32%
• 6M: 7.41%
• 1Y: 24.60%
• 3Y*: 21.00%
• 5Y*: 13.52%
• 10Y*: 15.45%

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

SPIIX vs. SDLAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SPIIX SEI S&P 500 Index Fund Class I	9.38%	16.97%	24.11%	25.49%	-18.84%	28.04%	17.66%	30.72%	-5.00%	21.06%
SDLAX SEI Institutional Investments Trust Dynamic Asset Allocation Fund	8.32%	20.37%	24.23%	22.00%	-16.10%	31.43%	20.70%	27.68%	-7.77%	19.77%

Correlation

The correlation between SPIIX and SDLAX 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 3, 2011	0.96

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

Return for Risk

SPIIX vs. SDLAX — Risk / Return Rank

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

SPIIX

SPIIX Risk / Return Rank: 60
SPIIX Sharpe Ratio Rank: 59
SPIIX Sortino Ratio Rank: 53
SPIIX Omega Ratio Rank: 55
SPIIX Calmar Ratio Rank: 62
SPIIX Martin Ratio Rank: 73

SDLAX

SDLAX Risk / Return Rank: 53
SDLAX Sharpe Ratio Rank: 51
SDLAX Sortino Ratio Rank: 46
SDLAX Omega Ratio Rank: 49
SDLAX Calmar Ratio Rank: 53
SDLAX 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.

SPIIX vs. SDLAX - Risk-Adjusted Trends Comparison

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

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	SPIIX	SDLAX	Difference
Sharpe ratio: Return per unit of total volatility	2.08	1.94	+0.14
Sortino ratio: Return per unit of downside risk	2.81	2.63	+0.19
Omega ratio: Gain probability vs. loss probability	1.38	1.35	+0.02
Calmar ratio: Return relative to maximum drawdown	2.87	2.67	+0.20
Martin ratio: Return relative to average drawdown	12.87	11.90	+0.97

SPIIX vs. SDLAX - Sharpe Ratio Comparison

The current SPIIX Sharpe Ratio is 2.08, which is comparable to the SDLAX Sharpe Ratio of 1.94. The chart below compares the historical Sharpe Ratios of SPIIX and SDLAX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

SPIIX vs. SDLAX - Drawdown Comparison

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

Drawdown Indicators

	SPIIX	SDLAX	Difference
Max Drawdown Largest peak-to-trough decline	-55.78%	-35.25%	-20.53%
Max Drawdown (1Y) Largest decline over 1 year	-9.02%	-9.76%	+0.74%
Max Drawdown (3Y) Largest decline over 3 years	-25.70%	-35.25%	+9.55%
Max Drawdown (5Y) Largest decline over 5 years	-25.70%	-35.25%	+9.55%
Max Drawdown (10Y) Largest decline over 10 years	-33.85%	-35.25%	+1.40%
Current Drawdown Current decline from peak	-1.75%	-2.22%	+0.47%
Average Drawdown Average peak-to-trough decline	-7.27%	-5.72%	-1.55%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.01%	2.18%	-0.17%

Volatility

SPIIX vs. SDLAX - Volatility Comparison

The current volatility for SEI S&P 500 Index Fund Class I (SPIIX) is 4.67%, while SEI Institutional Investments Trust Dynamic Asset Allocation Fund (SDLAX) has a volatility of 5.37%. This indicates that SPIIX experiences smaller price fluctuations and is considered to be less risky than SDLAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPIIX	SDLAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.67%	5.37%	-0.70%
Volatility (6M) Calculated over the trailing 6-month period	9.88%	10.94%	-1.06%
Volatility (1Y) Calculated over the trailing 1-year period	12.50%	13.47%	-0.97%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.53%	26.13%	-7.60%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.92%	22.76%	-3.84%

SPIIX vs. SDLAX - Expense Ratio Comparison

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

Dividends

SPIIX vs. SDLAX - Dividend Comparison

SPIIX's dividend yield for the trailing twelve months is around 7.70%, less than SDLAX's 12.75% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SDLAX SEI Institutional Investments Trust Dynamic Asset Allocation Fund	12.75%	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	7.70%	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 SPIIX and SDLAX in my portfolio?

With a correlation of 0.99, SPIIX and SDLAX 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, SPIIX or SDLAX?

SDLAX has higher volatility (5.37%) compared to SPIIX (4.67%). In terms of maximum drawdown, SPIIX dropped -55.78% vs SDLAX's -35.25%.

Which has better risk-adjusted returns?

SPIIX currently has the higher Sharpe Ratio (2.08 vs 1.94), 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.