SSAFX vs. SSFEX
SSAFX (State Street Aggregate Bond Index Portfolio) and SSFEX (State Street Aggregate Bond Index Fund Class K) are both mutual funds - SSAFX is a Intermediate Core Bond fund managed by State Street, while SSFEX is a Total Bond Market fund managed by State Street. Over the past 10 years, SSAFX returned 27.83%/yr vs -19.31%/yr for SSFEX. With a 0.99 correlation, they move nearly in lockstep. SSAFX charges 0.02%/yr vs 0.03%/yr for SSFEX.
Performance
SSAFX vs. SSFEX - Performance Comparison
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Returns By Period
As of year-to-date, both investments have demonstrated similar returns, with SSAFX at 0.42% and SSFEX at 0.42%. Over the past 10 years, SSAFX has outperformed SSFEX with an annualized return of 27.83%, while SSFEX has yielded a comparatively lower -19.31% annualized return.
SSAFX
- 1D
- 0.05%
- 1M
- 0.49%
- YTD
- 0.42%
- 6M
- 0.33%
- 1Y
- 5.39%
- 3Y*
- 3.90%
- 5Y*
- 0.09%
- 10Y*
- 27.83%
SSFEX
- 1D
- 0.05%
- 1M
- 0.49%
- YTD
- 0.42%
- 6M
- 0.33%
- 1Y
- 5.39%
- 3Y*
- 3.90%
- 5Y*
- 0.11%
- 10Y*
- -19.31%
SSAFX vs. SSFEX - Yearly Performance Comparison
| 2026 (YTD) | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | |
|---|---|---|---|---|---|---|---|---|---|---|
SSAFX State Street Aggregate Bond Index Portfolio | 0.42% | 6.81% | 1.34% | 5.61% | -13.30% | -1.72% | 978.57% | 8.69% | -0.12% | 3.38% |
SSFEX State Street Aggregate Bond Index Fund Class K | 0.42% | 6.80% | 1.35% | 5.61% | -13.19% | -1.78% | -89.22% | 9.45% | -0.10% | 3.30% |
Correlation
The correlation between SSAFX and SSFEX 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 | 0.99 |
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 Sep 23, 2014 | 0.99 |
The correlation between SSAFX and SSFEX has been stable across timeframes, ranging from 0.99 to 1.00 - a consistent structural relationship.
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Return for Risk
SSAFX vs. SSFEX — Risk / Return Rank
SSAFX
SSFEX
SSAFX vs. SSFEX - Risk-Adjusted Trends Comparison
This table presents a comparison of risk-adjusted performance metrics for State Street Aggregate Bond Index Portfolio (SSAFX) and State Street Aggregate Bond Index Fund Class K (SSFEX). 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.
| SSAFX | SSFEX | Difference | |
|---|---|---|---|
| Sharpe ratioReturn per unit of total volatility | 0.00 | ||
| Sortino ratioReturn per unit of downside risk | 0.00 | ||
| Omega ratioGain probability vs. loss probability | 1.26 | 1.26 | 0.00 |
| Calmar ratioReturn relative to maximum drawdown | 1.96 | 1.96 | 0.00 |
| Martin ratioReturn relative to average drawdown | 6.00 | 6.01 | -0.01 |
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
| SSAFX | SSFEX | Difference | |
|---|---|---|---|
Sharpe Ratio (1Y)Calculated over the trailing 1-year period | 1.45 | 1.44 | 0.00 |
Sharpe Ratio (5Y)Calculated over the trailing 5-year period | 0.01 | 0.02 | 0.00 |
Sharpe Ratio (10Y)Calculated over the trailing 10-year period | 0.10 | -0.61 | +0.71 |
Sharpe Ratio (All Time)Calculated using the full available price history | 0.09 | -0.55 | +0.65 |
Drawdowns
SSAFX vs. SSFEX - Drawdown Comparison
The maximum SSAFX drawdown since its inception was -18.74%, smaller than the maximum SSFEX drawdown of -92.70%. Use the drawdown chart below to compare losses from any high point for SSAFX and SSFEX.
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Drawdown Indicators
| SSAFX | SSFEX | Difference | |
|---|---|---|---|
Max DrawdownLargest peak-to-trough decline | -18.74% | -92.70% | +73.96% |
Max Drawdown (1Y)Largest decline over 1 year | -2.74% | -2.75% | +0.01% |
Max Drawdown (3Y)Largest decline over 3 years | -6.09% | -6.09% | 0.00% |
Max Drawdown (5Y)Largest decline over 5 years | -18.10% | -17.99% | -0.11% |
Max Drawdown (10Y)Largest decline over 10 years | -18.74% | -92.70% | +73.96% |
Current DrawdownCurrent decline from peak | -2.62% | -90.05% | +87.43% |
Average DrawdownAverage peak-to-trough decline | -4.41% | -48.00% | +43.59% |
Ulcer IndexDepth and duration of drawdowns from previous peaks | 0.90% | 0.90% | 0.00% |
Volatility
SSAFX vs. SSFEX - Volatility Comparison
State Street Aggregate Bond Index Portfolio (SSAFX) and State Street Aggregate Bond Index Fund Class K (SSFEX) have volatilities of 1.29% and 1.30%, 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
| SSAFX | SSFEX | Difference | |
|---|---|---|---|
Volatility (1M)Calculated over the trailing 1-month period | 1.29% | 1.30% | -0.01% |
Volatility (6M)Calculated over the trailing 6-month period | 2.65% | 2.66% | -0.01% |
Volatility (1Y)Calculated over the trailing 1-year period | 3.74% | 3.74% | 0.00% |
Volatility (5Y)Calculated over the trailing 5-year period, annualized | 5.95% | 5.93% | +0.02% |
Volatility (10Y)Calculated over the trailing 10-year period, annualized | 277.51% | 31.84% | +245.67% |
SSAFX vs. SSFEX - Expense Ratio Comparison
SSAFX has a 0.02% expense ratio, which is lower than SSFEX's 0.03% 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
SSAFX vs. SSFEX - Dividend Comparison
SSAFX's dividend yield for the trailing twelve months is around 4.16%, which matches SSFEX's 4.12% yield.
| Position | TTM | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
SSAFX State Street Aggregate Bond Index Portfolio | 4.16% | 3.70% | 3.76% | 3.16% | 2.49% | 1.90% | 2.41% | 2.88% | 2.82% | 2.42% | 2.21% | 3.21% |
SSFEX State Street Aggregate Bond Index Fund Class K | 4.12% | 3.66% | 3.76% | 3.14% | 2.48% | 3.32% | 9.59% | 3.56% | 2.79% | 2.43% | 2.19% | 4.67% |
Frequently Asked Questions
With a correlation of 1.00, SSAFX and SSFEX 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.
SSFEX has higher volatility (1.30%) compared to SSAFX (1.29%). In terms of maximum drawdown, SSAFX dropped -18.74% vs SSFEX's -92.70%.
SSAFX currently has the higher Sharpe Ratio (1.45 vs 1.44), 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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