SSPIX vs. WFSPX
SSPIX (SEI Institutional Managed Trust S&P 500 Index Fund) and WFSPX (iShares S&P 500 Index Fund Class K) are both S&P 500 funds from BlackRock tracking the S&P 500 Index. Both are passively managed. Over the past 10 years, SSPIX returned 15.41%/yr vs 15.68%/yr for WFSPX. With a 0.99 correlation, they move nearly in lockstep. SSPIX charges 0.25%/yr vs 0.03%/yr for WFSPX.
Performance
SSPIX vs. WFSPX - Performance Comparison
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Returns By Period
The year-to-date returns for both investments are quite close, with SSPIX having a 9.58% return and WFSPX slightly higher at 9.77%. Both investments have delivered pretty close results over the past 10 years, with SSPIX having a 15.41% annualized return and WFSPX not far ahead at 15.68%.
SSPIX
- 1D
- -0.37%
- 1M
- 0.08%
- YTD
- 9.58%
- 6M
- 8.58%
- 1Y
- 25.01%
- 3Y*
- 20.99%
- 5Y*
- 13.24%
- 10Y*
- 15.41%
WFSPX
- 1D
- -0.36%
- 1M
- 0.10%
- YTD
- 9.77%
- 6M
- 8.77%
- 1Y
- 25.45%
- 3Y*
- 21.35%
- 5Y*
- 13.57%
- 10Y*
- 15.68%
SSPIX vs. WFSPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SSPIX SEI Institutional Managed Trust S&P 500 Index Fund | 9.58% | 17.44% | 24.60% | 26.00% | -18.52% | 28.56% | 18.13% | 31.25% | -4.61% | 20.83% |
WFSPX iShares S&P 500 Index Fund Class K | 9.77% | 17.83% | 24.94% | 26.25% | -18.14% | 28.63% | 18.43% | 31.45% | -4.83% | 21.27% |
Correlation
The correlation between SSPIX and WFSPX 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 | 0.98 |
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 Jan 2, 1997 | 0.99 |
The correlation between SSPIX and WFSPX has been stable across timeframes, ranging from 0.98 to 0.99 - a consistent structural relationship.
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Return for Risk
SSPIX vs. WFSPX — Risk / Return Rank
SSPIX
WFSPX
SSPIX vs. WFSPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for SEI Institutional Managed Trust S&P 500 Index Fund (SSPIX) and iShares S&P 500 Index Fund Class K (WFSPX). 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.
| SSPIX | WFSPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | -0.03 | ||
| Sortino ratioReturn per unit of downside risk | -0.04 | ||
| Omega ratioGain probability vs. loss probability | 1.38 | 1.39 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 2.95 | 3.01 | -0.06 |
| Martin ratioReturn relative to average drawdown | 13.24 | 13.58 | -0.34 |
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Drawdowns
SSPIX vs. WFSPX - Drawdown Comparison
The maximum SSPIX drawdown since its inception was -55.66%, roughly equal to the maximum WFSPX drawdown of -58.21%. Use the drawdown chart below to compare losses from any high point for SSPIX and WFSPX.
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Drawdown Indicators
| SSPIX | WFSPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.66% | -58.21% | +2.55% |
Max Drawdown (1Y)Largest decline over 1 year | -8.96% | -8.90% | -0.06% |
Max Drawdown (3Y)Largest decline over 3 years | -25.65% | -18.74% | -6.91% |
Max Drawdown (5Y)Largest decline over 5 years | -25.65% | -24.51% | -1.14% |
Max Drawdown (10Y)Largest decline over 10 years | -33.82% | -33.74% | -0.08% |
Current DrawdownCurrent decline from peak | -1.73% | -1.72% | -0.01% |
Average DrawdownAverage peak-to-trough decline | -10.48% | -12.76% | +2.28% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.99% | 1.97% | +0.02% |
Volatility
SSPIX vs. WFSPX - Volatility Comparison
SEI Institutional Managed Trust S&P 500 Index Fund (SSPIX) and iShares S&P 500 Index Fund Class K (WFSPX) have volatilities of 4.67% 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.
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Volatility by Period
| SSPIX | WFSPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 4.67% | 4.67% | 0.00% |
Volatility (6M)Calculated over the trailing 6-month period | 9.88% | 9.83% | +0.05% |
Volatility (1Y)Calculated over the trailing 1-year period | 12.50% | 12.49% | +0.01% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 18.54% | 16.97% | +1.57% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.93% | 18.07% | +0.86% |
SSPIX vs. WFSPX - Expense Ratio Comparison
SSPIX has a 0.25% expense ratio, which is higher than WFSPX's 0.03% expense ratio. However, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
SSPIX vs. WFSPX - Dividend Comparison
SSPIX's dividend yield for the trailing twelve months is around 8.15%, more than WFSPX's 1.59% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SSPIX SEI Institutional Managed Trust S&P 500 Index Fund | 8.15% | 8.91% | 12.73% | 4.51% | 10.84% | 7.47% | 6.18% | 4.46% | 4.37% | 1.96% | 4.62% | 1.77% |
WFSPX iShares S&P 500 Index Fund Class K | 1.59% | 1.72% | 1.41% | 1.50% | 2.02% | 1.82% | 1.66% | 1.99% | 2.00% | 1.62% | 2.37% | 2.49% |
Frequently Asked Questions
With a correlation of 0.99, SSPIX and WFSPX 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.
WFSPX has higher volatility (4.67%) compared to SSPIX (4.67%). In terms of maximum drawdown, SSPIX dropped -55.66% vs WFSPX's -58.21%.
WFSPX currently has the higher Sharpe Ratio (2.15 vs 2.12), 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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