ELFNX vs. SSFDX

Last updated Jun 24, 2026

ELFNX (Elfun Trusts) and SSFDX (State Street Aggregate Bond Index Fund) are both mutual funds - ELFNX is a Large Cap Growth Equities fund managed by State Street, while SSFDX is a Intermediate Core Bond fund managed by State Street. Over the past 10 years, ELFNX returned 16.65%/yr vs 1.39%/yr for SSFDX. At a correlation of -0.05, they often move in opposite directions. ELFNX charges 0.18%/yr vs 0.23%/yr for SSFDX.

Performance

ELFNX vs. SSFDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Elfun Trusts (ELFNX) and State Street Aggregate Bond Index Fund (SSFDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ELFNX achieves a 3.81% return, which is significantly higher than SSFDX's 0.33% return. Over the past 10 years, ELFNX has outperformed SSFDX with an annualized return of 16.65%, while SSFDX has yielded a comparatively lower 1.39% annualized return.

ELFNX

• 1D: -1.12%
• 1M: -1.78%
• YTD: 3.81%
• 6M: 3.06%
• 1Y: 19.39%
• 3Y*: 20.53%
• 5Y*: 12.50%
• 10Y*: 16.65%

SSFDX

• 1D: -0.29%
• 1M: 0.61%
• YTD: 0.33%
• 6M: 0.47%
• 1Y: 4.22%
• 3Y*: 3.76%
• 5Y*: -0.14%
• 10Y*: 1.39%

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

ELFNX vs. SSFDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ELFNX Elfun Trusts	3.81%	16.64%	26.91%	34.50%	-19.91%	24.46%	25.18%	35.57%	-3.25%	25.60%
SSFDX State Street Aggregate Bond Index Fund	0.33%	6.80%	1.36%	5.39%	-13.36%	-1.98%	7.57%	8.98%	-0.20%	3.29%

Correlation

The correlation between ELFNX and SSFDX is 0.29, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.29
Correlation (3Y) Calculated over the trailing 3-year period	0.20
Correlation (5Y) Calculated over the trailing 5-year period	0.14
Correlation (10Y) Calculated over the trailing 10-year period	0.00
Correlation (All Time) Calculated using the full available price history since Sep 22, 2014	-0.05

The correlation between ELFNX and SSFDX shifts across timeframes, from -0.05 (all time) to 0.29 (1 year), reflecting how their relationship changes across market environments.

Return for Risk

ELFNX vs. SSFDX — Risk / Return Rank

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

ELFNX

ELFNX Risk / Return Rank: 31
ELFNX Sharpe Ratio Rank: 34
ELFNX Sortino Ratio Rank: 30
ELFNX Omega Ratio Rank: 32
ELFNX Calmar Ratio Rank: 26
ELFNX Martin Ratio Rank: 33

SSFDX

SSFDX Risk / Return Rank: 21
SSFDX Sharpe Ratio Rank: 21
SSFDX Sortino Ratio Rank: 22
SSFDX Omega Ratio Rank: 19
SSFDX Calmar Ratio Rank: 22
SSFDX Martin Ratio Rank: 20

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.

ELFNX vs. SSFDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Elfun Trusts (ELFNX) and State Street Aggregate Bond Index Fund (SSFDX). 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.

Values are calculated on a 1-year rolling basis and updated daily. Risk-adjusted metrics are more stable over longer periods — use the period switch above to explore them.

	ELFNX	SSFDX	Difference
Sharpe ratio: Return per unit of total volatility	1.56	1.21	+0.35
Sortino ratio: Return per unit of downside risk	2.14	1.81	+0.33
Omega ratio: Gain probability vs. loss probability	1.28	1.21	+0.07
Calmar ratio: Return relative to maximum drawdown	1.79	1.62	+0.17
Martin ratio: Return relative to average drawdown	7.15	4.64	+2.50

ELFNX vs. SSFDX - Sharpe Ratio Comparison

The current ELFNX Sharpe Ratio is 1.56, which is comparable to the SSFDX Sharpe Ratio of 1.21. The chart below compares the historical Sharpe Ratios of ELFNX and SSFDX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Drawdowns

ELFNX vs. SSFDX - Drawdown Comparison

The maximum ELFNX drawdown since its inception was -50.28%, which is greater than SSFDX's maximum drawdown of -26.93%. Use the drawdown chart below to compare losses from any high point for ELFNX and SSFDX.

Drawdown Indicators

	ELFNX	SSFDX	Difference
Max Drawdown Largest peak-to-trough decline	-50.28%	-26.93%	-23.35%
Max Drawdown (1Y) Largest decline over 1 year	-11.40%	-2.75%	-8.65%
Max Drawdown (3Y) Largest decline over 3 years	-19.58%	-6.13%	-13.45%
Max Drawdown (5Y) Largest decline over 5 years	-26.39%	-18.19%	-8.20%
Max Drawdown (10Y) Largest decline over 10 years	-32.44%	-26.93%	-5.51%
Current Drawdown Current decline from peak	-3.32%	-3.34%	+0.02%
Average Drawdown Average peak-to-trough decline	-7.62%	-4.66%	-2.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.86%	0.96%	+1.90%

Volatility

ELFNX vs. SSFDX - Volatility Comparison

Elfun Trusts (ELFNX) has a higher volatility of 4.82% compared to State Street Aggregate Bond Index Fund (SSFDX) at 1.08%. This indicates that ELFNX's price experiences larger fluctuations and is considered to be riskier than SSFDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ELFNX	SSFDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.82%	1.08%	+3.74%
Volatility (6M) Calculated over the trailing 6-month period	10.32%	2.74%	+7.58%
Volatility (1Y) Calculated over the trailing 1-year period	13.13%	3.69%	+9.44%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.99%	5.93%	+12.06%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.42%	14.12%	+4.30%

ELFNX vs. SSFDX - Expense Ratio Comparison

ELFNX has a 0.18% expense ratio, which is lower than SSFDX's 0.23% 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

ELFNX vs. SSFDX - Dividend Comparison

ELFNX's dividend yield for the trailing twelve months is around 9.50%, more than SSFDX's 4.11% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ELFNX Elfun Trusts	9.50%	9.87%	10.43%	2.90%	9.01%	11.62%	8.60%	9.39%	16.18%	10.80%	8.85%	8.22%
SSFDX State Street Aggregate Bond Index Fund	4.11%	3.64%	3.59%	2.95%	2.27%	3.12%	3.00%	3.15%	2.79%	2.43%	2.19%	4.63%

Frequently Asked Questions

Can I hold both ELFNX and SSFDX in my portfolio?

ELFNX and SSFDX have a correlation of 0.29, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ELFNX or SSFDX?

ELFNX has higher volatility (4.82%) compared to SSFDX (1.08%). In terms of maximum drawdown, ELFNX dropped -50.28% vs SSFDX's -26.93%.

Which has better risk-adjusted returns?

ELFNX currently has the higher Sharpe Ratio (1.56 vs 1.21), 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.