STFAX vs. SSSYX

Last updated Apr 1, 2026

Compare and contrast key facts about State Street Equity 500 Index Fund (STFAX) and State Street Equity 500 Index Fund Class K (SSSYX).

STFAX is managed by State Street. It was launched on Apr 18, 2001. SSSYX is a passively managed fund by State Street that tracks the performance of the S&P 500 Index. It was launched on Sep 17, 2014.

Performance

STFAX vs. SSSYX - Performance Comparison

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

STFAX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
STFAX State Street Equity 500 Index Fund	-7.09%	17.63%	24.80%	26.09%	-18.28%	28.31%	-88.19%	31.13%	-4.52%	21.43%
SSSYX State Street Equity 500 Index Fund Class K	-7.05%	17.81%	24.99%	26.27%	-18.16%	28.51%	18.31%	31.38%	-4.38%	21.61%

Returns By Period

The year-to-date returns for both investments are quite close, with STFAX having a -7.09% return and SSSYX slightly higher at -7.05%. Over the past 10 years, STFAX has underperformed SSSYX with an annualized return of -9.83%, while SSSYX has yielded a comparatively higher 13.69% annualized return.

STFAX

• 1D: -0.39%
• 1M: -7.68%
• YTD: -7.09%
• 6M: -4.67%
• 1Y: 14.23%
• 3Y*: 16.98%
• 5Y*: 11.20%
• 10Y*: -9.83%

SSSYX

• 1D: -0.39%
• 1M: -7.67%
• YTD: -7.05%
• 6M: -4.60%
• 1Y: 14.40%
• 3Y*: 17.15%
• 5Y*: 11.37%
• 10Y*: 13.69%

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

STFAX vs. SSSYX - Expense Ratio Comparison

STFAX 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%.

STFAX

State Street Equity 500 Index Fund

SSSYX

State Street Equity 500 Index Fund Class K

Return for Risk

STFAX vs. SSSYX — Risk / Return Rank

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

STFAX

STFAX Risk / Return Rank: 43
STFAX Sharpe Ratio Rank: 38
STFAX Sortino Ratio Rank: 42
STFAX Omega Ratio Rank: 46
STFAX Calmar Ratio Rank: 40
STFAX Martin Ratio Rank: 51

SSSYX

SSSYX Risk / Return Rank: 46
SSSYX Sharpe Ratio Rank: 41
SSSYX Sortino Ratio Rank: 45
SSSYX Omega Ratio Rank: 50
SSSYX Calmar Ratio Rank: 42
SSSYX Martin Ratio Rank: 53

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.

STFAX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Equity 500 Index Fund (STFAX) 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.

	STFAX	SSSYX	Difference
Sharpe ratio Return per unit of total volatility	0.83	0.84	-0.01
Sortino ratio Return per unit of downside risk	1.28	1.30	-0.01
Omega ratio Gain probability vs. loss probability	1.20	1.20	0.00
Calmar ratio Return relative to maximum drawdown	1.04	1.06	-0.01
Martin ratio Return relative to average drawdown	5.05	5.13	-0.08
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

STFAX vs. SSSYX - Sharpe Ratio Comparison

The current STFAX Sharpe Ratio is 0.83, which is comparable to the SSSYX Sharpe Ratio of 0.84. The chart below compares the historical Sharpe Ratios of STFAX and SSSYX, 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

	STFAX	SSSYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.83	0.84	-0.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.67	0.68	-0.01
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	-0.29	0.11	-0.40
Sharpe Ratio (All Time) Calculated using the full available price history	-0.07	0.11	-0.18

Correlation

The correlation between STFAX and SSSYX is 1.00, 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

STFAX vs. SSSYX - Dividend Comparison

STFAX's dividend yield for the trailing twelve months is around 1.39%, less than SSSYX's 1.55% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
STFAX State Street Equity 500 Index Fund	1.39%	1.29%	1.47%	1.63%	2.01%	2.61%	1.71%	4.28%	5.02%	5.78%	1.92%	1.69%
SSSYX State Street Equity 500 Index Fund Class K	1.55%	1.44%	1.63%	1.78%	2.16%	2.76%	1.86%	4.44%	5.18%	5.94%	2.07%	1.84%

Drawdowns

STFAX vs. SSSYX - Drawdown Comparison

The maximum STFAX drawdown since its inception was -91.92%, roughly equal to the maximum SSSYX drawdown of -91.48%. Use the drawdown chart below to compare losses from any high point for STFAX and SSSYX.

Drawdown Indicators

	STFAX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-91.92%	-91.48%	-0.44%
Max Drawdown (1Y) Largest decline over 1 year	-12.10%	-12.10%	0.00%
Max Drawdown (5Y) Largest decline over 5 years	-24.57%	-24.49%	-0.08%
Max Drawdown (10Y) Largest decline over 10 years	-91.92%	-91.48%	-0.44%
Current Drawdown Current decline from peak	-79.72%	-8.88%	-70.84%
Average Drawdown Average peak-to-trough decline	-29.32%	-4.20%	-25.12%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.50%	2.49%	+0.01%

Volatility

STFAX vs. SSSYX - Volatility Comparison

State Street Equity 500 Index Fund (STFAX) and State Street Equity 500 Index Fund Class K (SSSYX) have volatilities of 4.24% and 4.24%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	STFAX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.24%	4.24%	0.00%
Volatility (6M) Calculated over the trailing 6-month period	9.08%	9.08%	0.00%
Volatility (1Y) Calculated over the trailing 1-year period	18.10%	18.10%	0.00%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.84%	16.85%	-0.01%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	33.63%	124.43%	-90.80%