SSEYX vs. VIIIX
SSEYX (State Street Equity 500 Index II Portfolio) and VIIIX (Vanguard Institutional Index Fund Institutional Plus Shares) are both mutual funds - SSEYX is a Large Cap Blend Equities fund managed by State Street, while VIIIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, SSEYX returned 15.70%/yr vs 15.87%/yr for VIIIX. With a 1.00 correlation, they move nearly in lockstep. Both charge a 0.02% expense ratio.
Performance
SSEYX vs. VIIIX - Performance Comparison
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Returns By Period
As of year-to-date, both investments have demonstrated similar returns, with SSEYX at 9.78% and VIIIX at 9.78%. Both investments have delivered pretty close results over the past 10 years, with SSEYX having a 15.70% annualized return and VIIIX not far ahead at 15.87%.
SSEYX
- 1D
- -0.36%
- 1M
- 0.10%
- YTD
- 9.78%
- 6M
- 8.79%
- 1Y
- 25.17%
- 3Y*
- 21.28%
- 5Y*
- 13.52%
- 10Y*
- 15.70%
VIIIX
- 1D
- -0.37%
- 1M
- 0.10%
- YTD
- 9.78%
- 6M
- 8.78%
- 1Y
- 25.51%
- 3Y*
- 21.80%
- 5Y*
- 13.75%
- 10Y*
- 15.87%
SSEYX vs. VIIIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SSEYX State Street Equity 500 Index II Portfolio | 9.78% | 17.52% | 25.01% | 26.29% | -18.18% | 28.58% | 18.28% | 31.42% | -4.54% | 21.72% |
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares | 9.78% | 17.87% | 26.29% | 25.79% | -18.14% | 28.69% | 18.41% | 31.48% | -4.41% | 21.82% |
Correlation
The correlation between SSEYX and VIIIX 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 | 1.00 |
Correlation (5Y) Calculated over the trailing 5-year period | 1.00 |
Correlation (10Y) Calculated over the trailing 10-year period | 1.00 |
Correlation (All Time) Calculated using the full available price history since Aug 14, 2014 | 1.00 |
The correlation between SSEYX and VIIIX has been stable across timeframes, ranging from 1.00 to 1.00 - a consistent structural relationship.
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Return for Risk
SSEYX vs. VIIIX — Risk / Return Rank
SSEYX
VIIIX
SSEYX vs. VIIIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for State Street Equity 500 Index II Portfolio (SSEYX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX). 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.
| SSEYX | VIIIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.02 | ||
| Sortino ratioReturn per unit of downside risk | -0.03 | ||
| Omega ratioGain probability vs. loss probability | 1.39 | 1.39 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 2.98 | 3.02 | -0.03 |
| Martin ratioReturn relative to average drawdown | 13.47 | 13.62 | -0.16 |
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Drawdowns
SSEYX vs. VIIIX - Drawdown Comparison
The maximum SSEYX drawdown since its inception was -33.75%, smaller than the maximum VIIIX drawdown of -55.18%. Use the drawdown chart below to compare losses from any high point for SSEYX and VIIIX.
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Drawdown Indicators
| SSEYX | VIIIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -33.75% | -55.18% | +21.43% |
Max Drawdown (1Y)Largest decline over 1 year | -8.88% | -8.90% | +0.02% |
Max Drawdown (3Y)Largest decline over 3 years | -18.74% | -18.75% | +0.01% |
Max Drawdown (5Y)Largest decline over 5 years | -24.52% | -24.50% | -0.02% |
Max Drawdown (10Y)Largest decline over 10 years | -33.75% | -33.79% | +0.04% |
Current DrawdownCurrent decline from peak | -1.71% | -1.72% | +0.01% |
Average DrawdownAverage peak-to-trough decline | -4.08% | -10.00% | +5.92% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.96% | 1.97% | -0.01% |
Volatility
SSEYX vs. VIIIX - Volatility Comparison
State Street Equity 500 Index II Portfolio (SSEYX) and Vanguard Institutional Index Fund Institutional Plus Shares (VIIIX) have volatilities of 4.67% and 4.68%, 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.
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Volatility by Period
| SSEYX | VIIIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.67% | 4.68% | -0.01% |
Volatility (6M)Calculated over the trailing 6-month period | 9.82% | 9.84% | -0.02% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.48% | 12.50% | -0.02% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 17.00% | 16.98% | +0.02% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.11% | 18.11% | 0.00% |
SSEYX vs. VIIIX - Expense Ratio Comparison
Both SSEYX and VIIIX have an expense ratio of 0.02%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.
Dividends
SSEYX vs. VIIIX - Dividend Comparison
SSEYX's dividend yield for the trailing twelve months is around 1.26%, less than VIIIX's 2.45% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SSEYX State Street Equity 500 Index II Portfolio | 1.26% | 1.38% | 1.93% | 1.46% | 1.57% | 2.48% | 3.63% | 2.36% | 5.91% | 5.37% | 2.29% | 3.47% |
VIIIX Vanguard Institutional Index Fund Institutional Plus Shares | 2.45% | 2.11% | 3.66% | 2.66% | 3.39% | 4.79% | 3.07% | 2.86% | 2.45% | 1.84% | 2.38% | 2.47% |
Frequently Asked Questions
With a correlation of 1.00, SSEYX and VIIIX 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.
VIIIX has higher volatility (4.68%) compared to SSEYX (4.67%). In terms of maximum drawdown, SSEYX dropped -33.75% vs VIIIX's -55.18%.
VIIIX currently has the higher Sharpe Ratio (2.15 vs 2.13), 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.
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