SSFEX vs. VBMPX
SSFEX (State Street Aggregate Bond Index Fund Class K) and VBMPX (Vanguard Total Bond Market Index Fund Institutional Plus Shares) are both Total Bond Market funds. Over the past 10 years, SSFEX returned -19.32%/yr vs 1.56%/yr for VBMPX. Their correlation of 0.93 suggests significant overlap in exposure. Both charge a 0.03% expense ratio.
Performance
SSFEX vs. VBMPX - Performance Comparison
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Returns By Period
The year-to-date returns for both investments are quite close, with SSFEX having a 0.21% return and VBMPX slightly higher at 0.22%. Over the past 10 years, SSFEX has underperformed VBMPX with an annualized return of -19.32%, while VBMPX has yielded a comparatively higher 1.56% annualized return.
SSFEX
- 1D
- -0.21%
- 1M
- 0.08%
- YTD
- 0.21%
- 6M
- 0.32%
- 1Y
- 4.54%
- 3Y*
- 3.82%
- 5Y*
- -0.01%
- 10Y*
- -19.32%
VBMPX
- 1D
- -0.21%
- 1M
- 0.14%
- YTD
- 0.22%
- 6M
- 0.35%
- 1Y
- 4.49%
- 3Y*
- 3.99%
- 5Y*
- 0.11%
- 10Y*
- 1.56%
SSFEX vs. VBMPX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SSFEX State Street Aggregate Bond Index Fund Class K | 0.21% | 6.80% | 1.35% | 5.61% | -13.19% | -1.78% | -89.22% | 9.45% | -0.10% | 3.30% |
VBMPX Vanguard Total Bond Market Index Fund Institutional Plus Shares | 0.22% | 7.18% | 1.27% | 5.75% | -13.14% | -1.95% | 7.75% | 8.74% | -0.24% | 3.58% |
Correlation
The correlation between SSFEX and VBMPX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.
| Correlation | |
|---|---|
Correlation (1Y) Calculated over the trailing 1-year period | 0.92 |
Correlation (3Y) Calculated over the trailing 3-year period | 0.95 |
Correlation (5Y) Calculated over the trailing 5-year period | 0.96 |
Correlation (10Y) Calculated over the trailing 10-year period | 0.93 |
Correlation (All Time) Calculated using the full available price history since Sep 23, 2014 | 0.93 |
The correlation between SSFEX and VBMPX has been stable across timeframes, ranging from 0.92 to 0.96 - a consistent structural relationship.
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Return for Risk
SSFEX vs. VBMPX — Risk / Return Rank
SSFEX
VBMPX
SSFEX vs. VBMPX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for State Street Aggregate Bond Index Fund Class K (SSFEX) and Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX). 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.
| SSFEX | VBMPX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | +0.09 | ||
| Sortino ratioReturn per unit of downside risk | +0.12 | ||
| Omega ratioGain probability vs. loss probability | 1.25 | 1.23 | +0.01 |
| Calmar ratioReturn relative to maximum drawdown | 1.89 | 1.79 | +0.10 |
| Martin ratioReturn relative to average drawdown | 5.75 | 5.35 | +0.40 |
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
| SSFEX | VBMPX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.39 | 1.30 | +0.09 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | -0.00 | 0.02 | -0.02 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | -0.61 | 0.31 | -0.92 |
Sharpe Ratio (All Time)Calculated using the full available price history | -0.55 | 0.52 | -1.07 |
Drawdowns
SSFEX vs. VBMPX - Drawdown Comparison
The maximum SSFEX drawdown since its inception was -92.70%, which is greater than VBMPX's maximum drawdown of -18.90%. Use the drawdown chart below to compare losses from any high point for SSFEX and VBMPX.
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Drawdown Indicators
| SSFEX | VBMPX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -92.70% | -18.90% | -73.80% |
Max Drawdown (1Y)Largest decline over 1 year | -2.75% | -2.89% | +0.14% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -5.99% | -0.10% |
Max Drawdown (5Y)Largest decline over 5 years | -17.99% | -18.12% | +0.13% |
Max Drawdown (10Y)Largest decline over 10 years | -92.70% | -18.90% | -73.80% |
Current DrawdownCurrent decline from peak | -90.07% | -2.44% | -87.63% |
Average DrawdownAverage peak-to-trough decline | -48.01% | -3.53% | -44.48% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.90% | 0.96% | -0.06% |
Volatility
SSFEX vs. VBMPX - Volatility Comparison
State Street Aggregate Bond Index Fund Class K (SSFEX) and Vanguard Total Bond Market Index Fund Institutional Plus Shares (VBMPX) have volatilities of 1.27% and 1.33%, 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
| SSFEX | VBMPX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.27% | 1.33% | -0.06% |
Volatility (6M)Calculated over the trailing 6-month period | 2.63% | 2.78% | -0.15% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.74% | 3.96% | -0.22% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.93% | 6.02% | -0.09% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 31.83% | 4.98% | +26.85% |
SSFEX vs. VBMPX - Expense Ratio Comparison
Both SSFEX and VBMPX have an expense ratio of 0.03%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.
Dividends
SSFEX vs. VBMPX - Dividend Comparison
SSFEX's dividend yield for the trailing twelve months is around 4.13%, more than VBMPX's 4.01% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SSFEX State Street Aggregate Bond Index Fund Class K | 4.13% | 3.66% | 3.76% | 3.14% | 2.48% | 3.32% | 9.59% | 3.56% | 2.79% | 2.43% | 2.19% | 4.67% |
VBMPX Vanguard Total Bond Market Index Fund Institutional Plus Shares | 4.01% | 3.88% | 3.69% | 3.11% | 2.61% | 1.81% | 2.41% | 2.75% | 2.58% | 2.58% | 2.55% | 2.85% |
Frequently Asked Questions
With a correlation of 0.92, SSFEX and VBMPX 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.
VBMPX has higher volatility (1.33%) compared to SSFEX (1.27%). In terms of maximum drawdown, SSFEX dropped -92.70% vs VBMPX's -18.90%.
SSFEX currently has the higher Sharpe Ratio (1.39 vs 1.30), 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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