SSKEX vs. SSSYX

Last updated Jun 25, 2026

SSKEX (State Street Emerging Markets Equity Index Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both mutual funds - SSKEX is a Emerging Markets Diversified fund managed by State Street, while SSSYX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, SSKEX returned 10.42%/yr vs 45.49%/yr for SSSYX. A 0.56 correlation means they provide meaningful diversification when combined. SSKEX charges 0.17%/yr vs 0.02%/yr for SSSYX.

Performance

SSKEX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Emerging Markets Equity Index Fund (SSKEX) and State Street Equity 500 Index Fund Class K (SSSYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SSKEX achieves a 25.59% return, which is significantly higher than SSSYX's 8.21% return. Over the past 10 years, SSKEX has underperformed SSSYX with an annualized return of 10.42%, while SSSYX has yielded a comparatively higher 45.49% annualized return.

SSKEX

• 1D: -3.92%
• 1M: 3.46%
• YTD: 25.59%
• 6M: 26.77%
• 1Y: 47.05%
• 3Y*: 23.31%
• 5Y*: 7.43%
• 10Y*: 10.42%

SSSYX

• 1D: -1.43%
• 1M: -1.33%
• YTD: 8.21%
• 6M: 6.88%
• 1Y: 22.31%
• 3Y*: 20.78%
• 5Y*: 13.11%
• 10Y*: 45.49%

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

SSKEX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SSKEX State Street Emerging Markets Equity Index Fund	25.59%	33.79%	7.00%	9.50%	-20.23%	-2.80%	18.20%	18.16%	-14.78%	37.18%
SSSYX State Street Equity 500 Index Fund Class K	8.21%	17.81%	24.99%	26.27%	-18.16%	28.51%	1,083.11%	31.38%	-4.38%	21.61%

Correlation

The correlation between SSKEX and SSSYX is 0.50, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.50
Correlation (3Y) Calculated over the trailing 3-year period	0.50
Correlation (5Y) Calculated over the trailing 5-year period	0.53
Correlation (10Y) Calculated over the trailing 10-year period	0.56
Correlation (All Time) Calculated using the full available price history since Jan 4, 2016	0.56

The correlation between SSKEX and SSSYX has been stable across timeframes, ranging from 0.50 to 0.56 - a consistent structural relationship.

Return for Risk

SSKEX vs. SSSYX — Risk / Return Rank

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

SSKEX

SSKEX Risk / Return Rank: 85
SSKEX Sharpe Ratio Rank: 89
SSKEX Sortino Ratio Rank: 77
SSKEX Omega Ratio Rank: 83
SSKEX Calmar Ratio Rank: 88
SSKEX Martin Ratio Rank: 86

SSSYX

SSSYX Risk / Return Rank: 52
SSSYX Sharpe Ratio Rank: 49
SSSYX Sortino Ratio Rank: 45
SSSYX Omega Ratio Rank: 47
SSSYX Calmar Ratio Rank: 54
SSSYX Martin Ratio Rank: 66

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.

SSKEX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Emerging Markets Equity Index Fund (SSKEX) and State Street Equity 500 Index Fund Class K (SSSYX). 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.

	SSKEX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	2.63	1.90	+0.74
Sortino ratio: Return per unit of downside risk	3.31	2.58	+0.73
Omega ratio: Gain probability vs. loss probability	1.50	1.34	+0.16
Calmar ratio: Return relative to maximum drawdown	4.06	2.68	+1.38
Martin ratio: Return relative to average drawdown	14.76	12.02	+2.74

SSKEX vs. SSSYX - Sharpe Ratio Comparison

The current SSKEX Sharpe Ratio is 2.63, which is higher than the SSSYX Sharpe Ratio of 1.90. The chart below compares the historical Sharpe Ratios of SSKEX and SSSYX, 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

SSKEX vs. SSSYX - Drawdown Comparison

The maximum SSKEX drawdown since its inception was -39.23%, which is greater than SSSYX's maximum drawdown of -33.77%. Use the drawdown chart below to compare losses from any high point for SSKEX and SSSYX.

Drawdown Indicators

	SSKEX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-39.23%	-33.77%	-5.46%
Max Drawdown (1Y) Largest decline over 1 year	-12.44%	-8.88%	-3.56%
Max Drawdown (3Y) Largest decline over 3 years	-16.09%	-18.74%	+2.65%
Max Drawdown (5Y) Largest decline over 5 years	-36.85%	-24.49%	-12.36%
Max Drawdown (10Y) Largest decline over 10 years	-39.23%	-33.77%	-5.46%
Current Drawdown Current decline from peak	-3.92%	-3.12%	-0.80%
Average Drawdown Average peak-to-trough decline	-13.21%	-3.91%	-9.30%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.41%	1.97%	+1.44%

Volatility

SSKEX vs. SSSYX - Volatility Comparison

State Street Emerging Markets Equity Index Fund (SSKEX) has a higher volatility of 10.82% compared to State Street Equity 500 Index Fund Class K (SSSYX) at 4.89%. This indicates that SSKEX's price experiences larger fluctuations and is considered to be riskier than SSSYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SSKEX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	10.82%	4.89%	+5.93%
Volatility (6M) Calculated over the trailing 6-month period	17.18%	9.92%	+7.26%
Volatility (1Y) Calculated over the trailing 1-year period	19.18%	12.56%	+6.62%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.08%	16.99%	+0.09%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.50%	121.18%	-103.68%

SSKEX vs. SSSYX - Expense Ratio Comparison

SSKEX has a 0.17% expense ratio, which is higher than SSSYX's 0.02% 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

SSKEX vs. SSSYX - Dividend Comparison

SSKEX's dividend yield for the trailing twelve months is around 2.27%, more than SSSYX's 1.33% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSKEX State Street Emerging Markets Equity Index Fund	2.27%	2.85%	2.90%	3.26%	3.90%	1.95%	1.84%	2.84%	3.01%	2.55%	2.29%	0.00%
SSSYX State Street Equity 500 Index Fund Class K	1.33%	1.44%	1.63%	1.78%	2.16%	2.76%	1.86%	4.44%	5.18%	5.94%	2.07%	1.84%

Frequently Asked Questions

Can I hold both SSKEX and SSSYX in my portfolio?

SSKEX and SSSYX have a correlation of 0.50, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SSKEX or SSSYX?

SSKEX has higher volatility (10.82%) compared to SSSYX (4.89%). In terms of maximum drawdown, SSKEX dropped -39.23% vs SSSYX's -33.77%.

Which has better risk-adjusted returns?

SSKEX currently has the higher Sharpe Ratio (2.63 vs 1.90), 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.