WFBIX vs. SSPIX
WFBIX (iShares U.S. Aggregate Bond Index Fund) and SSPIX (SEI Institutional Managed Trust S&P 500 Index Fund) are both mutual funds - WFBIX is a Intermediate Core Bond fund managed by BlackRock, while SSPIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, WFBIX returned 1.96%/yr vs 15.28%/yr for SSPIX. At a correlation of -0.13, they often move in opposite directions. WFBIX charges 0.05%/yr vs 0.25%/yr for SSPIX.
Performance
WFBIX vs. SSPIX - Performance Comparison
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Returns By Period
In the year-to-date period, WFBIX achieves a 0.43% return, which is significantly lower than SSPIX's 11.51% return. Over the past 10 years, WFBIX has underperformed SSPIX with an annualized return of 1.96%, while SSPIX has yielded a comparatively higher 15.28% annualized return.
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
- 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 vs. SSPIX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
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% |
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% |
Correlation
The correlation between WFBIX and SSPIX 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 WFBIX and SSPIX 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
WFBIX vs. SSPIX — Risk / Return Rank
WFBIX
SSPIX
WFBIX vs. SSPIX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for iShares U.S. Aggregate Bond Index Fund (WFBIX) and SEI Institutional Managed Trust S&P 500 Index Fund (SSPIX). 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.
| WFBIX | SSPIX | 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 | 1.25 | 1.45 | -0.21 |
| Calmar ratioReturn relative to maximum drawdown | 1.78 | 3.28 | -1.49 |
| Martin ratioReturn relative to average drawdown | 5.34 | 15.24 | -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
| WFBIX | SSPIX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.36 | 2.48 | -1.13 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.16 | 0.76 | -0.60 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.38 | 0.81 | -0.43 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.94 | 0.50 | +0.44 |
Drawdowns
WFBIX vs. SSPIX - Drawdown Comparison
The maximum WFBIX drawdown since its inception was -18.68%, smaller than the maximum SSPIX drawdown of -55.66%. Use the drawdown chart below to compare losses from any high point for WFBIX and SSPIX.
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Drawdown Indicators
| WFBIX | SSPIX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.68% | -55.66% | +36.98% |
Max Drawdown (1Y)Largest decline over 1 year | -3.02% | -8.96% | +5.94% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -25.65% | +19.56% |
Max Drawdown (5Y)Largest decline over 5 years | -17.84% | -25.65% | +7.81% |
Max Drawdown (10Y)Largest decline over 10 years | -18.68% | -33.82% | +15.14% |
Current DrawdownCurrent decline from peak | -1.50% | 0.00% | -1.50% |
Average DrawdownAverage peak-to-trough decline | -2.26% | -10.50% | +8.24% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 1.00% | 1.92% | -0.92% |
Volatility
WFBIX vs. SSPIX - Volatility Comparison
The current volatility for iShares U.S. Aggregate Bond Index Fund (WFBIX) is 1.34%, while SEI Institutional Managed Trust S&P 500 Index Fund (SSPIX) has a volatility of 2.83%. This indicates that WFBIX experiences smaller price fluctuations and is considered to be less risky than SSPIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.
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Volatility by Period
| WFBIX | SSPIX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.34% | 2.83% | -1.49% |
Volatility (6M)Calculated over the trailing 6-month period | 2.83% | 8.94% | -6.11% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.97% | 11.83% | -7.86% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 6.40% | 18.45% | -12.05% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 5.17% | 18.88% | -13.71% |
WFBIX vs. SSPIX - Expense Ratio Comparison
WFBIX has a 0.05% expense ratio, which is lower than SSPIX's 0.25% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.
Dividends
WFBIX vs. SSPIX - Dividend Comparison
WFBIX's dividend yield for the trailing twelve months is around 3.91%, less than SSPIX's 8.01% 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
WFBIX and SSPIX 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, WFBIX dropped -18.68% vs SSPIX's -55.66%.
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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