SSPIX vs. WFBIX
SSPIX (SEI Institutional Managed Trust S&P 500 Index Fund) and WFBIX (iShares U.S. Aggregate Bond Index Fund) are both mutual funds - SSPIX is a S&P 500 fund tracking the S&P 500 Index, while WFBIX is a Intermediate Core Bond fund managed by BlackRock. Over the past 10 years, SSPIX returned 15.28%/yr vs 1.96%/yr for WFBIX. At a correlation of -0.13, they often move in opposite directions. SSPIX charges 0.25%/yr vs 0.05%/yr for WFBIX.
Performance
SSPIX vs. WFBIX - Performance Comparison
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Returns By Period
In the year-to-date period, SSPIX achieves a 11.51% return, which is significantly higher than WFBIX's 0.43% return. Over the past 10 years, SSPIX has outperformed WFBIX with an annualized return of 15.28%, while WFBIX has yielded a comparatively lower 1.96% annualized return.
SSPIX
- 1D
- 0.13%
- 1M
- 5.76%
- YTD
- 11.51%
- 6M
- 11.44%
- 1Y
- 28.48%
- 3Y*
- 22.36%
- 5Y*
- 13.92%
- 10Y*
- 15.28%
WFBIX
- 1D
- 0.00%
- 1M
- 0.45%
- YTD
- 0.43%
- 6M
- 0.32%
- 1Y
- 5.35%
- 3Y*
- 5.33%
- 5Y*
- 0.99%
- 10Y*
- 1.96%
SSPIX vs. WFBIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SSPIX SEI Institutional Managed Trust S&P 500 Index Fund | 11.51% | 17.44% | 24.60% | 26.00% | -18.52% | 28.56% | 18.13% | 31.25% | -4.61% | 20.83% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 0.43% | 7.16% | 1.43% | 9.65% | -13.03% | -1.79% | 7.40% | 8.72% | -0.08% | 3.39% |
Correlation
The correlation between SSPIX and WFBIX is 0.24, which is low. Their price movements are largely independent, making them effective diversification partners.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.24 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.21 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.14 |
Correlation (10Y) Calculated over the trailing 10-year period | -0.00 |
Correlation (All Time) Calculated using the full available price history since Jan 3, 1997 | -0.13 |
The correlation between SSPIX and WFBIX shifts across timeframes, from -0.13 (all time) to 0.24 (1 year), reflecting how their relationship changes across market environments.
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Return for Risk
SSPIX vs. WFBIX — Risk / Return Rank
SSPIX
WFBIX
SSPIX vs. WFBIX - 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 U.S. Aggregate Bond Index Fund (WFBIX). 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.
| SSPIX | WFBIX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +1.13 | ||
| Sortino ratioReturn per unit of downside risk | +1.33 | ||
| Omega ratioGain probability vs. loss probability | 1.45 | 1.25 | +0.21 |
| Calmar ratioReturn relative to maximum drawdown | 3.28 | 1.78 | +1.49 |
| Martin ratioReturn relative to average drawdown | 15.24 | 5.34 | +9.90 |
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month. | |||
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Sharpe Ratios by Period
| SSPIX | WFBIX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 2.48 | 1.36 | +1.13 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.76 | 0.16 | +0.60 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.81 | 0.38 | +0.43 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.50 | 0.94 | -0.44 |
Drawdowns
SSPIX vs. WFBIX - Drawdown Comparison
The maximum SSPIX drawdown since its inception was -55.66%, which is greater than WFBIX's maximum drawdown of -18.68%. Use the drawdown chart below to compare losses from any high point for SSPIX and WFBIX.
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Drawdown Indicators
| SSPIX | WFBIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -55.66% | -18.68% | -36.98% |
Max Drawdown (1Y)Largest decline over 1 year | -8.96% | -3.02% | -5.94% |
Max Drawdown (3Y)Largest decline over 3 years | -25.65% | -6.09% | -19.56% |
Max Drawdown (5Y)Largest decline over 5 years | -25.65% | -17.84% | -7.81% |
Max Drawdown (10Y)Largest decline over 10 years | -33.82% | -18.68% | -15.14% |
Current DrawdownCurrent decline from peak | 0.00% | -1.50% | +1.50% |
Average DrawdownAverage peak-to-trough decline | -10.50% | -2.26% | -8.24% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.92% | 1.00% | +0.92% |
Volatility
SSPIX vs. WFBIX - Volatility Comparison
SEI Institutional Managed Trust S&P 500 Index Fund (SSPIX) has a higher volatility of 2.83% compared to iShares U.S. Aggregate Bond Index Fund (WFBIX) at 1.34%. This indicates that SSPIX's price experiences larger fluctuations and is considered to be riskier than WFBIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| SSPIX | WFBIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 2.83% | 1.34% | +1.49% |
Volatility (6M)Calculated over the trailing 6-month period | 8.94% | 2.83% | +6.11% |
Volatility (1Y)Calculated over the trailing 1-year period | 11.83% | 3.97% | +7.86% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 18.45% | 6.40% | +12.05% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 18.88% | 5.17% | +13.71% |
SSPIX vs. WFBIX - Expense Ratio Comparison
SSPIX has a 0.25% expense ratio, which is higher than WFBIX's 0.05% 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. WFBIX - Dividend Comparison
SSPIX's dividend yield for the trailing twelve months is around 8.01%, more than WFBIX's 3.91% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SSPIX SEI Institutional Managed Trust S&P 500 Index Fund | 8.01% | 8.91% | 12.73% | 4.51% | 10.84% | 7.47% | 6.18% | 4.46% | 4.37% | 1.96% | 4.62% | 1.77% |
WFBIX iShares U.S. Aggregate Bond Index Fund | 3.91% | 3.78% | 3.68% | 6.82% | 2.60% | 2.04% | 2.43% | 2.88% | 2.71% | 2.24% | 2.25% | 2.20% |
Frequently Asked Questions
SSPIX and WFBIX have a correlation of 0.24, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.
SSPIX has higher volatility (2.83%) compared to WFBIX (1.34%). In terms of maximum drawdown, SSPIX dropped -55.66% vs WFBIX's -18.68%.
SSPIX currently has the higher Sharpe Ratio (2.48 vs 1.36), 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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