SPINX vs. SPIIX

Last updated Jun 24, 2026

SPINX (SEI Institutional Investments Trust S&P 500 Index Fund) and SPIIX (SEI S&P 500 Index Fund Class I) are both mutual funds - SPINX is a S&P 500 fund tracking the S&P 500 Index, while SPIIX is a Large Cap Blend Equities fund tracking the S&P 500 Index. Both are passively managed. Over the past 10 years, SPINX returned 15.64%/yr vs 15.03%/yr for SPIIX. With a 0.99 correlation, they move nearly in lockstep. SPINX charges 0.12%/yr vs 0.65%/yr for SPIIX.

Performance

SPINX vs. SPIIX - Performance Comparison

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

Returns By Period

The year-to-date returns for both stocks are quite close, with SPINX having a 9.73% return and SPIIX slightly lower at 9.38%. Both investments have delivered pretty close results over the past 10 years, with SPINX having a 15.64% annualized return and SPIIX not far behind at 15.03%.

SPINX

• 1D: -0.39%
• 1M: 0.09%
• YTD: 9.73%
• 6M: 8.74%
• 1Y: 25.53%
• 3Y*: 21.05%
• 5Y*: 13.36%
• 10Y*: 15.64%

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%

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

SPINX vs. SPIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SPINX SEI Institutional Investments Trust S&P 500 Index Fund	9.73%	17.89%	24.02%	26.24%	-18.27%	28.62%	18.35%	31.42%	-4.46%	21.74%
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%

Correlation

The correlation between SPINX and SPIIX is 1.00 - 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	1.00
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (10Y) Calculated over the trailing 10-year period	0.99
Correlation (All Time) Calculated using the full available price history since Dec 19, 2013	0.99

The correlation between SPINX and SPIIX has been stable across timeframes, ranging from 0.98 to 1.00 - a consistent structural relationship.

Return for Risk

SPINX vs. SPIIX — Risk / Return Rank

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

SPINX

SPINX Risk / Return Rank: 65
SPINX Sharpe Ratio Rank: 64
SPINX Sortino Ratio Rank: 57
SPINX Omega Ratio Rank: 60
SPINX Calmar Ratio Rank: 68
SPINX Martin Ratio Rank: 78

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

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.

SPINX vs. SPIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SEI Institutional Investments Trust S&P 500 Index Fund (SPINX) 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.

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.

	SPINX	SPIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.16	2.08	+0.08
Sortino ratio: Return per unit of downside risk	2.91	2.81	+0.09
Omega ratio: Gain probability vs. loss probability	1.39	1.38	+0.01
Calmar ratio: Return relative to maximum drawdown	3.02	2.87	+0.15
Martin ratio: Return relative to average drawdown	13.63	12.87	+0.76

SPINX vs. SPIIX - Sharpe Ratio Comparison

The current SPINX Sharpe Ratio is 2.16, which is comparable to the SPIIX Sharpe Ratio of 2.08. The chart below compares the historical Sharpe Ratios of SPINX 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.

Drawdowns

SPINX vs. SPIIX - Drawdown Comparison

The maximum SPINX drawdown since its inception was -33.82%, smaller than the maximum SPIIX drawdown of -55.78%. Use the drawdown chart below to compare losses from any high point for SPINX and SPIIX.

Drawdown Indicators

	SPINX	SPIIX	Difference
Max Drawdown Largest peak-to-trough decline	-33.82%	-55.78%	+21.96%
Max Drawdown (1Y) Largest decline over 1 year	-8.92%	-9.02%	+0.10%
Max Drawdown (3Y) Largest decline over 3 years	-32.91%	-25.70%	-7.21%
Max Drawdown (5Y) Largest decline over 5 years	-32.91%	-25.70%	-7.21%
Max Drawdown (10Y) Largest decline over 10 years	-33.82%	-33.85%	+0.03%
Current Drawdown Current decline from peak	-1.76%	-1.75%	-0.01%
Average Drawdown Average peak-to-trough decline	-5.20%	-7.27%	+2.07%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.97%	2.01%	-0.04%

Volatility

SPINX vs. SPIIX - Volatility Comparison

SEI Institutional Investments Trust S&P 500 Index Fund (SPINX) and SEI S&P 500 Index Fund Class I (SPIIX) have volatilities of 4.68% and 4.67%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SPINX	SPIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.68%	4.67%	+0.01%
Volatility (6M) Calculated over the trailing 6-month period	9.92%	9.88%	+0.04%
Volatility (1Y) Calculated over the trailing 1-year period	12.53%	12.50%	+0.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.57%	18.53%	+4.04%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.00%	18.92%	+2.08%

SPINX vs. SPIIX - Expense Ratio Comparison

SPINX has a 0.12% expense ratio, which is lower than SPIIX's 0.65% expense ratio.

Dividends

SPINX vs. SPIIX - Dividend Comparison

SPINX's dividend yield for the trailing twelve months is around 10.86%, more than SPIIX's 7.70% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
SPINX SEI Institutional Investments Trust S&P 500 Index Fund	10.86%	11.90%	26.02%	9.77%	9.59%	6.58%	3.58%	3.01%	4.94%	2.32%	1.97%	2.29%

Frequently Asked Questions

Can I hold both SPINX and SPIIX in my portfolio?

With a correlation of 1.00, SPINX 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, SPINX or SPIIX?

SPINX has higher volatility (4.68%) compared to SPIIX (4.67%). In terms of maximum drawdown, SPINX dropped -33.82% vs SPIIX's -55.78%.

Which has better risk-adjusted returns?

SPINX currently has the higher Sharpe Ratio (2.16 vs 2.08), 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.