VLGSX vs. SSFEX

Last updated Jun 4, 2026

VLGSX (Vanguard Long-Term Treasury Index Fund Admiral Shares) and SSFEX (State Street Aggregate Bond Index Fund Class K) are both mutual funds - VLGSX is a Government Bonds fund managed by Vanguard, while SSFEX is a Total Bond Market fund managed by State Street. Over the past 10 years, VLGSX returned -1.06%/yr vs -19.31%/yr for SSFEX. Their correlation of 0.90 suggests significant overlap in exposure. VLGSX charges 0.07%/yr vs 0.03%/yr for SSFEX.

Performance

VLGSX vs. SSFEX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Vanguard Long-Term Treasury Index Fund Admiral Shares (VLGSX) and State Street Aggregate Bond Index Fund Class K (SSFEX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, VLGSX achieves a -0.22% return, which is significantly lower than SSFEX's 0.42% return. Over the past 10 years, VLGSX has outperformed SSFEX with an annualized return of -1.06%, while SSFEX has yielded a comparatively lower -19.31% annualized return.

VLGSX

• 1D: 0.16%
• 1M: 1.10%
• YTD: -0.22%
• 6M: -1.36%
• 1Y: 5.60%
• 3Y*: -0.48%
• 5Y*: -4.95%
• 10Y*: -1.06%

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%

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

VLGSX vs. SSFEX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
VLGSX Vanguard Long-Term Treasury Index Fund Admiral Shares	-0.22%	5.42%	-6.17%	3.66%	-29.48%	-4.99%	17.70%	14.31%	-1.62%	8.65%
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 VLGSX and SSFEX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.94
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.90
Correlation (All Time) Calculated using the full available price history since Sep 23, 2014	0.90

The correlation between VLGSX and SSFEX has been stable across timeframes, ranging from 0.90 to 0.94 - a consistent structural relationship.

Return for Risk

VLGSX vs. SSFEX — Risk / Return Rank

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

VLGSX

VLGSX Risk / Return Rank: 7
VLGSX Sharpe Ratio Rank: 7
VLGSX Sortino Ratio Rank: 7
VLGSX Omega Ratio Rank: 7
VLGSX Calmar Ratio Rank: 8
VLGSX Martin Ratio Rank: 7

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

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.

VLGSX vs. SSFEX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Vanguard Long-Term Treasury Index Fund Admiral Shares (VLGSX) 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.

	VLGSX	SSFEX	Difference
Sharpe ratio Return per unit of total volatility	0.62	1.44	-0.83
Sortino ratio Return per unit of downside risk	0.95	2.17	-1.22
Omega ratio Gain probability vs. loss probability	1.11	1.26	-0.15
Calmar ratio Return relative to maximum drawdown	0.79	1.96	-1.17
Martin ratio Return relative to average drawdown	2.05	6.01	-3.96
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

VLGSX vs. SSFEX - Sharpe Ratio Comparison

The current VLGSX Sharpe Ratio is 0.62, which is lower than the SSFEX Sharpe Ratio of 1.44. The chart below compares the historical Sharpe Ratios of VLGSX and SSFEX, 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

	VLGSX	SSFEX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.62	1.44	-0.83
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	-0.34	0.02	-0.36
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.08	-0.61	+0.53
Sharpe Ratio (All Time) Calculated using the full available price history	0.17	-0.55	+0.73

Drawdowns

VLGSX vs. SSFEX - Drawdown Comparison

The maximum VLGSX drawdown since its inception was -46.22%, smaller than the maximum SSFEX drawdown of -92.70%. Use the drawdown chart below to compare losses from any high point for VLGSX and SSFEX.

Drawdown Indicators

	VLGSX	SSFEX	Difference
Max Drawdown Largest peak-to-trough decline	-46.22%	-92.70%	+46.48%
Max Drawdown (1Y) Largest decline over 1 year	-6.99%	-2.75%	-4.24%
Max Drawdown (3Y) Largest decline over 3 years	-17.67%	-6.09%	-11.58%
Max Drawdown (5Y) Largest decline over 5 years	-41.02%	-17.99%	-23.03%
Max Drawdown (10Y) Largest decline over 10 years	-46.22%	-92.70%	+46.48%
Current Drawdown Current decline from peak	-36.45%	-90.05%	+53.60%
Average Drawdown Average peak-to-trough decline	-15.12%	-48.00%	+32.88%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.68%	0.90%	+1.78%

Volatility

VLGSX vs. SSFEX - Volatility Comparison

Vanguard Long-Term Treasury Index Fund Admiral Shares (VLGSX) has a higher volatility of 2.64% compared to State Street Aggregate Bond Index Fund Class K (SSFEX) at 1.30%. This indicates that VLGSX's price experiences larger fluctuations and is considered to be riskier than SSFEX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	VLGSX	SSFEX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.64%	1.30%	+1.34%
Volatility (6M) Calculated over the trailing 6-month period	6.08%	2.66%	+3.42%
Volatility (1Y) Calculated over the trailing 1-year period	8.94%	3.74%	+5.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.55%	5.93%	+8.62%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	13.71%	31.84%	-18.13%

VLGSX vs. SSFEX - Expense Ratio Comparison

VLGSX has a 0.07% expense ratio, which is higher than SSFEX's 0.03% 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

VLGSX vs. SSFEX - Dividend Comparison

VLGSX's dividend yield for the trailing twelve months is around 4.57%, more than SSFEX's 4.12% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
VLGSX Vanguard Long-Term Treasury Index Fund Admiral Shares	4.57%	4.41%	4.65%	3.30%	2.80%	1.85%	2.13%	2.45%	2.72%	2.55%	2.46%	2.80%

Frequently Asked Questions

Can I hold both VLGSX and SSFEX in my portfolio?

With a correlation of 0.94, VLGSX 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.

Which is riskier, VLGSX or SSFEX?

VLGSX has higher volatility (2.64%) compared to SSFEX (1.30%). In terms of maximum drawdown, VLGSX dropped -46.22% vs SSFEX's -92.70%.

Which has better risk-adjusted returns?

SSFEX currently has the higher Sharpe Ratio (1.44 vs 0.62), 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.