WEUSX vs. SPIIX

Last updated Jun 4, 2026

WEUSX (SEI Institutional Investments Trust World Equity Ex-US Fund) and SPIIX (SEI S&P 500 Index Fund Class I) are both mutual funds - WEUSX is a Foreign Large Cap Equities fund managed by SEI, while SPIIX is a Large Cap Blend Equities fund tracking the S&P 500 Index. Over the past 10 years, WEUSX returned 10.13%/yr vs 14.89%/yr for SPIIX. A 0.74 correlation means they provide meaningful diversification when combined. WEUSX charges 0.63%/yr vs 0.65%/yr for SPIIX.

Performance

WEUSX vs. SPIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SEI Institutional Investments Trust World Equity Ex-US Fund (WEUSX) 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, WEUSX achieves a 13.48% return, which is significantly higher than SPIIX's 11.33% return. Over the past 10 years, WEUSX has underperformed SPIIX with an annualized return of 10.13%, while SPIIX has yielded a comparatively higher 14.89% annualized return.

WEUSX

• 1D: 0.58%
• 1M: 5.92%
• YTD: 13.48%
• 6M: 15.80%
• 1Y: 28.37%
• 3Y*: 19.84%
• 5Y*: 8.37%
• 10Y*: 10.13%

SPIIX

• 1D: 0.12%
• 1M: 5.72%
• YTD: 11.33%
• 6M: 11.21%
• 1Y: 27.96%
• 3Y*: 21.87%
• 5Y*: 13.46%
• 10Y*: 14.89%

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

WEUSX vs. SPIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
WEUSX SEI Institutional Investments Trust World Equity Ex-US Fund	13.48%	29.41%	7.19%	16.95%	-16.61%	7.36%	14.61%	23.74%	-16.01%	29.52%
SPIIX SEI S&P 500 Index Fund Class I	11.33%	16.97%	24.11%	25.49%	-18.84%	28.04%	17.66%	30.72%	-5.00%	21.06%

Correlation

The correlation between WEUSX and SPIIX is 0.77, 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	0.77
Correlation (3Y) Calculated over the trailing 3-year period	0.64
Correlation (5Y) Calculated over the trailing 5-year period	0.68
Correlation (10Y) Calculated over the trailing 10-year period	0.70
Correlation (All Time) Calculated using the full available price history since Sep 5, 2007	0.74

The correlation between WEUSX and SPIIX shifts across timeframes, from 0.64 (3 years) to 0.77 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

WEUSX vs. SPIIX — Risk / Return Rank

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

WEUSX

WEUSX Risk / Return Rank: 47
WEUSX Sharpe Ratio Rank: 49
WEUSX Sortino Ratio Rank: 47
WEUSX Omega Ratio Rank: 47
WEUSX Calmar Ratio Rank: 44
WEUSX Martin Ratio Rank: 46

SPIIX

SPIIX Risk / Return Rank: 68
SPIIX Sharpe Ratio Rank: 70
SPIIX Sortino Ratio Rank: 62
SPIIX Omega Ratio Rank: 63
SPIIX Calmar Ratio Rank: 69
SPIIX Martin Ratio Rank: 79

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.

WEUSX vs. SPIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SEI Institutional Investments Trust World Equity Ex-US Fund (WEUSX) 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.

	WEUSX	SPIIX	Difference
Sharpe ratio: Return per unit of total volatility	2.08	2.44	-0.36
Sortino ratio: Return per unit of downside risk	2.88	3.31	-0.43
Omega ratio: Gain probability vs. loss probability	1.38	1.44	-0.07
Calmar ratio: Return relative to maximum drawdown	2.52	3.20	-0.67
Martin ratio: Return relative to average drawdown	9.54	14.82	-5.27
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

WEUSX vs. SPIIX - Sharpe Ratio Comparison

The current WEUSX Sharpe Ratio is 2.08, which is comparable to the SPIIX Sharpe Ratio of 2.44. The chart below compares the historical Sharpe Ratios of WEUSX 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

	WEUSX	SPIIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.08	2.44	-0.36
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	0.73	-0.30
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.57	0.79	-0.23
Sharpe Ratio (All Time) Calculated using the full available price history	0.19	0.57	-0.38

Drawdowns

WEUSX vs. SPIIX - Drawdown Comparison

The maximum WEUSX drawdown since its inception was -67.47%, which is greater than SPIIX's maximum drawdown of -55.78%. Use the drawdown chart below to compare losses from any high point for WEUSX and SPIIX.

Drawdown Indicators

	WEUSX	SPIIX	Difference
Max Drawdown Largest peak-to-trough decline	-67.47%	-55.78%	-11.69%
Max Drawdown (1Y) Largest decline over 1 year	-11.11%	-9.02%	-2.09%
Max Drawdown (3Y) Largest decline over 3 years	-14.22%	-25.70%	+11.48%
Max Drawdown (5Y) Largest decline over 5 years	-39.17%	-25.70%	-13.47%
Max Drawdown (10Y) Largest decline over 10 years	-39.17%	-33.85%	-5.32%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-23.05%	-7.28%	-15.77%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.93%	1.94%	+0.99%

Volatility

WEUSX vs. SPIIX - Volatility Comparison

SEI Institutional Investments Trust World Equity Ex-US Fund (WEUSX) has a higher volatility of 3.97% compared to SEI S&P 500 Index Fund Class I (SPIIX) at 2.83%. This indicates that WEUSX'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

	WEUSX	SPIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.97%	2.83%	+1.14%
Volatility (6M) Calculated over the trailing 6-month period	10.90%	8.94%	+1.96%
Volatility (1Y) Calculated over the trailing 1-year period	13.52%	11.83%	+1.69%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.29%	18.44%	+0.85%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.97%	18.87%	-0.90%

WEUSX vs. SPIIX - Expense Ratio Comparison

WEUSX has a 0.63% expense ratio, which is lower than SPIIX's 0.65% expense ratio.

Dividends

WEUSX vs. SPIIX - Dividend Comparison

WEUSX's dividend yield for the trailing twelve months is around 11.04%, more than SPIIX's 7.57% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SPIIX SEI S&P 500 Index Fund Class I	7.57%	8.42%	12.20%	4.10%	10.27%	7.03%	5.78%	4.04%	3.90%	2.08%	4.34%	1.53%
WEUSX SEI Institutional Investments Trust World Equity Ex-US Fund	11.04%	12.53%	4.12%	2.99%	5.00%	23.87%	1.68%	2.48%	5.75%	2.27%	2.00%	2.62%

Frequently Asked Questions

Can I hold both WEUSX and SPIIX in my portfolio?

WEUSX and SPIIX have a correlation of 0.77, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, WEUSX or SPIIX?

WEUSX has higher volatility (3.97%) compared to SPIIX (2.83%). In terms of maximum drawdown, WEUSX dropped -67.47% vs SPIIX's -55.78%.

Which has better risk-adjusted returns?

SPIIX currently has the higher Sharpe Ratio (2.44 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.