SSFEX vs. BND

Last updated Jun 4, 2026

SSFEX (State Street Aggregate Bond Index Fund Class K) and BND (Vanguard Total Bond Market ETF) are both Total Bond Market funds. Over the past 10 years, SSFEX returned -19.31%/yr vs 1.58%/yr for BND. Their correlation of 0.94 suggests significant overlap in exposure. Both charge a 0.03% expense ratio.

Performance

SSFEX vs. BND - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Aggregate Bond Index Fund Class K (SSFEX) and Vanguard Total Bond Market ETF (BND). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SSFEX achieves a 0.42% return, which is significantly higher than BND's 0.27% return. Over the past 10 years, SSFEX has underperformed BND with an annualized return of -19.31%, while BND has yielded a comparatively higher 1.58% annualized return.

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%

BND

• 1D: -0.19%
• 1M: 0.27%
• YTD: 0.27%
• 6M: 0.12%
• 1Y: 5.11%
• 3Y*: 3.96%
• 5Y*: 0.09%
• 10Y*: 1.58%

*Multi-year figures are annualized to reflect compound growth (CAGR)

SSFEX vs. BND - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
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%
BND Vanguard Total Bond Market ETF	0.27%	7.08%	1.38%	5.65%	-13.11%	-1.86%	7.71%	8.84%	-0.12%	3.57%

Correlation

The correlation between SSFEX and BND is 0.98 - 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	0.98
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.98
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Sep 23, 2014	0.94

The correlation between SSFEX and BND has been stable across timeframes, ranging from 0.94 to 0.98 - a consistent structural relationship.

Return for Risk

SSFEX vs. BND — Risk / Return Rank

Compare risk-adjusted metric ranks to identify better-performing investments over the past 12 months.

SSFEX

SSFEX Risk / Return Rank: 26
SSFEX Sharpe Ratio Rank: 26
SSFEX Sortino Ratio Rank: 27
SSFEX Omega Ratio Rank: 24
SSFEX Calmar Ratio Rank: 28
SSFEX Martin Ratio Rank: 24

BND

BND Risk / Return Rank: 37
BND Sharpe Ratio Rank: 37
BND Sortino Ratio Rank: 39
BND Omega Ratio Rank: 35
BND Calmar Ratio Rank: 38
BND Martin Ratio Rank: 36

The rank (0–100) shows how this investment's returns compare to the risk taken. Higher = better. Based on the past 12 months of data, combining Sharpe, Sortino, and other metrics used by quantitative funds and institutional investors.

SSFEX vs. BND - 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 ETF (BND). 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	BND	Difference
Sharpe ratio: Return per unit of total volatility	1.44	1.36	+0.09
Sortino ratio: Return per unit of downside risk	2.17	2.03	+0.13
Omega ratio: Gain probability vs. loss probability	1.26	1.24	+0.02
Calmar ratio: Return relative to maximum drawdown	1.96	1.92	+0.04
Martin ratio: Return relative to average drawdown	6.01	5.80	+0.21
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SSFEX vs. BND - Sharpe Ratio Comparison

The current SSFEX Sharpe Ratio is 1.44, which is comparable to the BND Sharpe Ratio of 1.36. The chart below compares the historical Sharpe Ratios of SSFEX and BND, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	SSFEX	BND	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.44	1.36	+0.09
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.02	0.01	0.00
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.61	0.29	-0.89
Sharpe Ratio (All Time) Calculated using the full available price history	-0.55	0.59	-1.14

Drawdowns

SSFEX vs. BND - Drawdown Comparison

The maximum SSFEX drawdown since its inception was -92.70%, which is greater than BND's maximum drawdown of -18.58%. Use the drawdown chart below to compare losses from any high point for SSFEX and BND.

Drawdown Indicators

	SSFEX	BND	Difference
Max Drawdown Largest peak-to-trough decline	-92.70%	-18.58%	-74.12%
Max Drawdown (1Y) Largest decline over 1 year	-2.75%	-2.68%	-0.07%
Max Drawdown (3Y) Largest decline over 3 years	-6.09%	-5.92%	-0.17%
Max Drawdown (5Y) Largest decline over 5 years	-17.99%	-17.91%	-0.08%
Max Drawdown (10Y) Largest decline over 10 years	-92.70%	-18.58%	-74.12%
Current Drawdown Current decline from peak	-90.05%	-2.37%	-87.68%
Average Drawdown Average peak-to-trough decline	-48.00%	-3.06%	-44.94%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.90%	0.88%	+0.02%

Volatility

SSFEX vs. BND - Volatility Comparison

State Street Aggregate Bond Index Fund Class K (SSFEX) has a higher volatility of 1.30% compared to Vanguard Total Bond Market ETF (BND) at 1.23%. This indicates that SSFEX's price experiences larger fluctuations and is considered to be riskier than BND based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SSFEX	BND	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.30%	1.23%	+0.07%
Volatility (6M) Calculated over the trailing 6-month period	2.66%	2.66%	0.00%
Volatility (1Y) Calculated over the trailing 1-year period	3.74%	3.78%	-0.04%
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	31.84%	5.53%	+26.31%

SSFEX vs. BND - Expense Ratio Comparison

Both SSFEX and BND 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. BND - Dividend Comparison

SSFEX's dividend yield for the trailing twelve months is around 4.12%, more than BND's 3.97% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BND Vanguard Total Bond Market ETF	3.97%	3.86%	3.67%	3.09%	2.60%	2.12%	2.38%	2.72%	2.81%	2.54%	2.51%	2.57%
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

Can I hold both SSFEX and BND in my portfolio?

With a correlation of 0.98, SSFEX and BND 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.

Which is riskier, SSFEX or BND?

SSFEX has higher volatility (1.30%) compared to BND (1.23%). In terms of maximum drawdown, SSFEX dropped -92.70% vs BND's -18.58%.

Which has better risk-adjusted returns?

SSFEX currently has the higher Sharpe Ratio (1.44 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.