SSFEX vs. DOXIX

Last updated Apr 1, 2026

Compare and contrast key facts about State Street Aggregate Bond Index Fund Class K (SSFEX) and Dodge & Cox Income Fund Class X (DOXIX).

SSFEX is managed by State Street. DOXIX is an actively managed fund by Dodge & Cox. It was launched on May 2, 2022.

Performance

SSFEX vs. DOXIX - 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 Dodge & Cox Income Fund Class X (DOXIX). The values are adjusted to include any dividend payments, if applicable.

SSFEX vs. DOXIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
SSFEX State Street Aggregate Bond Index Fund Class K	-0.17%	6.80%	1.35%	5.61%	-3.54%
DOXIX Dodge & Cox Income Fund Class X	-0.17%	8.39%	2.33%	7.75%	-2.35%

Returns By Period

As of year-to-date, both investments have demonstrated similar returns, with SSFEX at -0.17% and DOXIX at -0.17%.

SSFEX

• 1D: 0.53%
• 1M: -1.96%
• YTD: -0.17%
• 6M: 0.82%
• 1Y: 4.12%
• 3Y*: 3.42%
• 5Y*: 0.17%
• 10Y*: -19.27%

DOXIX

• 1D: 0.63%
• 1M: -2.30%
• YTD: -0.17%
• 6M: 1.13%
• 1Y: 5.17%
• 3Y*: 4.97%
• 5Y*: —
• 10Y*: —

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

SSFEX vs. DOXIX - Expense Ratio Comparison

SSFEX has a 0.03% expense ratio, which is lower than DOXIX's 0.33% expense ratio.

DOXIX

Dodge & Cox Income Fund Class X

SSFEX

State Street Aggregate Bond Index Fund Class K

Return for Risk

SSFEX vs. DOXIX — Risk / Return Rank

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

SSFEX

SSFEX Risk / Return Rank: 57
SSFEX Sharpe Ratio Rank: 55
SSFEX Sortino Ratio Rank: 54
SSFEX Omega Ratio Rank: 38
SSFEX Calmar Ratio Rank: 80
SSFEX Martin Ratio Rank: 56

DOXIX

DOXIX Risk / Return Rank: 67
DOXIX Sharpe Ratio Rank: 67
DOXIX Sortino Ratio Rank: 68
DOXIX Omega Ratio Rank: 53
DOXIX Calmar Ratio Rank: 84
DOXIX Martin Ratio Rank: 65

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. DOXIX - 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 Dodge & Cox Income Fund Class X (DOXIX). 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	DOXIX	Difference
Sharpe ratio Return per unit of total volatility	1.04	1.18	-0.14
Sortino ratio Return per unit of downside risk	1.49	1.68	-0.18
Omega ratio Gain probability vs. loss probability	1.18	1.21	-0.03
Calmar ratio Return relative to maximum drawdown	1.96	2.06	-0.10
Martin ratio Return relative to average drawdown	5.43	6.15	-0.72
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. DOXIX - Sharpe Ratio Comparison

The current SSFEX Sharpe Ratio is 1.04, which is comparable to the DOXIX Sharpe Ratio of 1.18. The chart below compares the historical Sharpe Ratios of SSFEX and DOXIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	SSFEX	DOXIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.04	1.18	-0.14
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.03	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.61	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	-0.56	0.68	-1.24

Correlation

The correlation between SSFEX and DOXIX is 0.96, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

SSFEX vs. DOXIX - Dividend Comparison

SSFEX's dividend yield for the trailing twelve months is around 4.04%, less than DOXIX's 4.36% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSFEX State Street Aggregate Bond Index Fund Class K	4.04%	3.66%	3.76%	3.14%	2.48%	3.32%	9.59%	3.56%	2.79%	2.43%	2.19%	4.67%
DOXIX Dodge & Cox Income Fund Class X	4.36%	4.30%	4.32%	3.92%	2.30%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Drawdowns

SSFEX vs. DOXIX - Drawdown Comparison

The maximum SSFEX drawdown since its inception was -92.70%, which is greater than DOXIX's maximum drawdown of -8.83%. Use the drawdown chart below to compare losses from any high point for SSFEX and DOXIX.

Drawdown Indicators

	SSFEX	DOXIX	Difference
Max Drawdown Largest peak-to-trough decline	-92.70%	-8.83%	-83.87%
Max Drawdown (1Y) Largest decline over 1 year	-2.52%	-2.92%	+0.40%
Max Drawdown (5Y) Largest decline over 5 years	-17.99%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-92.70%	—	—
Current Drawdown Current decline from peak	-90.11%	-2.30%	-87.81%
Average Drawdown Average peak-to-trough decline	-47.36%	-1.87%	-45.49%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.91%	0.98%	-0.07%

Volatility

SSFEX vs. DOXIX - Volatility Comparison

The current volatility for State Street Aggregate Bond Index Fund Class K (SSFEX) is 1.61%, while Dodge & Cox Income Fund Class X (DOXIX) has a volatility of 1.80%. This indicates that SSFEX experiences smaller price fluctuations and is considered to be less risky than DOXIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SSFEX	DOXIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.61%	1.80%	-0.19%
Volatility (6M) Calculated over the trailing 6-month period	2.50%	2.76%	-0.26%
Volatility (1Y) Calculated over the trailing 1-year period	4.20%	4.57%	-0.37%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	5.91%	5.92%	-0.01%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	31.83%	5.92%	+25.91%