ELFNX vs. SSMKX

Last updated Apr 1, 2026

Compare and contrast key facts about Elfun Trusts (ELFNX) and State Street Small/Mid Cap Equity Index Fund (SSMKX).

ELFNX is managed by State Street. It was launched on May 27, 1935. SSMKX is managed by State Street. It was launched on Aug 12, 2015.

Performance

ELFNX vs. SSMKX - Performance Comparison

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

ELFNX vs. SSMKX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ELFNX Elfun Trusts	-9.40%	16.64%	26.91%	34.50%	-19.91%	24.46%	25.18%	35.57%	-3.25%	25.60%
SSMKX State Street Small/Mid Cap Equity Index Fund	-4.46%	12.77%	17.20%	25.20%	-25.49%	12.38%	32.41%	27.82%	-9.02%	18.16%

Returns By Period

In the year-to-date period, ELFNX achieves a -9.40% return, which is significantly lower than SSMKX's -4.46% return. Over the past 10 years, ELFNX has outperformed SSMKX with an annualized return of 14.84%, while SSMKX has yielded a comparatively lower 10.91% annualized return.

ELFNX

• 1D: -0.21%
• 1M: -7.68%
• YTD: -9.40%
• 6M: -6.55%
• 1Y: 12.68%
• 3Y*: 18.88%
• 5Y*: 10.93%
• 10Y*: 14.84%

SSMKX

• 1D: -0.92%
• 1M: -8.01%
• YTD: -4.46%
• 6M: -4.04%
• 1Y: 17.62%
• 3Y*: 14.28%
• 5Y*: 4.29%
• 10Y*: 10.91%

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

ELFNX vs. SSMKX - Expense Ratio Comparison

ELFNX has a 0.18% expense ratio, which is higher than SSMKX's 0.05% 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%.

ELFNX

Elfun Trusts

SSMKX

State Street Small/Mid Cap Equity Index Fund

Return for Risk

ELFNX vs. SSMKX — Risk / Return Rank

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

ELFNX

ELFNX Risk / Return Rank: 34
ELFNX Sharpe Ratio Rank: 32
ELFNX Sortino Ratio Rank: 34
ELFNX Omega Ratio Rank: 35
ELFNX Calmar Ratio Rank: 34
ELFNX Martin Ratio Rank: 33

SSMKX

SSMKX Risk / Return Rank: 38
SSMKX Sharpe Ratio Rank: 36
SSMKX Sortino Ratio Rank: 39
SSMKX Omega Ratio Rank: 36
SSMKX Calmar Ratio Rank: 39
SSMKX Martin Ratio Rank: 42

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. SSMKX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Elfun Trusts (ELFNX) and State Street Small/Mid Cap Equity Index Fund (SSMKX). 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.

	ELFNX	SSMKX	Difference
Sharpe ratio Return per unit of total volatility	0.71	0.77	-0.06
Sortino ratio Return per unit of downside risk	1.13	1.22	-0.09
Omega ratio Gain probability vs. loss probability	1.16	1.17	0.00
Calmar ratio Return relative to maximum drawdown	0.93	1.01	-0.08
Martin ratio Return relative to average drawdown	3.55	4.29	-0.74
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ELFNX vs. SSMKX - Sharpe Ratio Comparison

The current ELFNX Sharpe Ratio is 0.71, which is comparable to the SSMKX Sharpe Ratio of 0.77. The chart below compares the historical Sharpe Ratios of ELFNX and SSMKX, 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

	ELFNX	SSMKX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.71	0.77	-0.06
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.19	+0.42
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.81	0.49	+0.32
Sharpe Ratio (All Time) Calculated using the full available price history	0.58	0.49	+0.09

Correlation

The correlation between ELFNX and SSMKX is 0.82, 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

ELFNX vs. SSMKX - Dividend Comparison

ELFNX's dividend yield for the trailing twelve months is around 10.89%, more than SSMKX's 5.34% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ELFNX Elfun Trusts	10.89%	9.87%	10.43%	2.90%	9.01%	11.62%	8.60%	9.39%	16.18%	10.80%	8.85%	8.22%
SSMKX State Street Small/Mid Cap Equity Index Fund	5.34%	5.10%	2.12%	2.56%	17.09%	9.69%	1.47%	5.75%	3.68%	5.52%	1.30%	0.00%

Drawdowns

ELFNX vs. SSMKX - Drawdown Comparison

The maximum ELFNX drawdown since its inception was -50.28%, which is greater than SSMKX's maximum drawdown of -41.65%. Use the drawdown chart below to compare losses from any high point for ELFNX and SSMKX.

Drawdown Indicators

	ELFNX	SSMKX	Difference
Max Drawdown Largest peak-to-trough decline	-50.28%	-41.65%	-8.63%
Max Drawdown (1Y) Largest decline over 1 year	-11.48%	-14.48%	+3.00%
Max Drawdown (5Y) Largest decline over 5 years	-26.39%	-35.19%	+8.80%
Max Drawdown (10Y) Largest decline over 10 years	-32.44%	-41.65%	+9.21%
Current Drawdown Current decline from peak	-11.40%	-10.03%	-1.37%
Average Drawdown Average peak-to-trough decline	-7.65%	-8.81%	+1.16%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.01%	3.42%	-0.41%

Volatility

ELFNX vs. SSMKX - Volatility Comparison

The current volatility for Elfun Trusts (ELFNX) is 4.40%, while State Street Small/Mid Cap Equity Index Fund (SSMKX) has a volatility of 5.96%. This indicates that ELFNX experiences smaller price fluctuations and is considered to be less risky than SSMKX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ELFNX	SSMKX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.40%	5.96%	-1.56%
Volatility (6M) Calculated over the trailing 6-month period	9.57%	12.77%	-3.20%
Volatility (1Y) Calculated over the trailing 1-year period	18.37%	22.44%	-4.07%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.87%	22.22%	-4.35%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.35%	22.20%	-3.85%