SSSYX vs. SSDDX

Last updated Aug 4, 2026

SSSYX (State Street Equity 500 Index Fund Class K) and SSDDX (State Street Target Retirement 2045 Fund) are both mutual funds - SSSYX is a S&P 500 fund tracking the S&P 500 Index, while SSDDX is a Target Retirement Date fund managed by State Street. Over the past 10 years, SSSYX returned 44.89%/yr vs 10.33%/yr for SSDDX. Their correlation of 0.92 means they have usually moved in the same direction. SSSYX charges 0.02%/yr vs 0.18%/yr for SSDDX.

Performance

SSSYX vs. SSDDX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Equity 500 Index Fund Class K (SSSYX) and State Street Target Retirement 2045 Fund (SSDDX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, SSSYX achieves a 10.11% return, which is significantly higher than SSDDX's 9.22% return. Over the past 10 years, SSSYX has outperformed SSDDX with an annualized return of 44.89%, while SSDDX has yielded a comparatively lower 10.33% annualized return.

SSSYX

• 1D: 0.71%
• 1M: 0.15%
• 6M: 7.96%
• YTD: 10.11%
• 1Y: 21.46%
• 3Y*: 19.39%
• 5Y*: 12.81%
• 10Y*: 44.89%
• ALL TIME*: 37.71%

SSDDX

• 1D: 0.33%
• 1M: -0.60%
• 6M: 5.96%
• YTD: 9.22%
• 1Y: 19.77%
• 3Y*: 14.95%
• 5Y*: 7.56%
• 10Y*: 10.33%
• ALL TIME*: 9.34%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
SSDDX State Street Target Retirement 2045 Fund	$0.00	$0.00	$0.00
SSSYX State Street Equity 500 Index Fund Class K	$0.00	$0.00	$0.00

SSSYX vs. SSDDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SSSYX State Street Equity 500 Index Fund Class K	10.11%	17.81%	24.99%	26.27%	-18.16%	28.51%	1,083.11%	31.38%	-4.38%	21.61%
SSDDX State Street Target Retirement 2045 Fund	9.22%	19.92%	11.80%	18.48%	-18.97%	13.08%	19.28%	25.41%	-7.95%	19.14%

Correlation

The correlation between SSSYX and SSDDX is 0.92, meaning they have usually moved in the same direction, including during past declines.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.92
Correlation (3Y) Balances recent behavior with more history.	0.91
Correlation (5Y) Shows whether the relationship held over a longer period.	0.92
Correlation (10Y) Provides a long-term view across more market conditions.	0.92
Correlation (All Time) Calculated using the full available price history since Oct 1, 2014	0.92

The correlation between SSSYX and SSDDX has been stable across timeframes, ranging from 0.91 to 0.92 - a consistent structural relationship.

Return for Risk

SSSYX vs. SSDDX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

SSSYX

SSSYX Risk / Return Rank: 59
SSSYX Sharpe Ratio Rank: 56
SSSYX Sortino Ratio Rank: 52
SSSYX Omega Ratio Rank: 52
SSSYX Calmar Ratio Rank: 61
SSSYX Martin Ratio Rank: 74

SSDDX

SSDDX Risk / Return Rank: 65
SSDDX Sharpe Ratio Rank: 66
SSDDX Sortino Ratio Rank: 63
SSDDX Omega Ratio Rank: 66
SSDDX Calmar Ratio Rank: 63
SSDDX Martin Ratio Rank: 69

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

SSSYX vs. SSDDX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Equity 500 Index Fund Class K (SSSYX) and State Street Target Retirement 2045 Fund (SSDDX). 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.

	SSSYX	SSDDX	Difference
Sharpe ratio: Return per unit of total volatility	1.52	1.66	-0.13
Sortino ratio: Return per unit of downside risk	2.12	2.34	-0.22
Omega ratio: Gain probability vs. loss probability	1.27	1.31	-0.04
Calmar ratio: Return relative to maximum drawdown	2.21	2.26	-0.06
Martin ratio: Return relative to average drawdown	9.47	9.15	+0.32

SSSYX vs. SSDDX - Sharpe Ratio Comparison

The current SSSYX Sharpe Ratio is 1.52, which is comparable to the SSDDX Sharpe Ratio of 1.66. The chart below compares the historical Sharpe Ratios of SSSYX and SSDDX, 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

SSSYX vs. SSDDX - Drawdown Comparison

The maximum SSSYX drawdown since its inception was -33.77%, which is greater than SSDDX's maximum drawdown of -29.22%. Use the drawdown chart below to compare losses from any high point for SSSYX and SSDDX.

Drawdown Indicators

	SSSYX	SSDDX	Difference
Max Drawdown Largest peak-to-trough decline	-33.77%	-29.22%	-4.55%
Max Drawdown (1Y) Largest decline over 1 year	-8.88%	-8.35%	-0.53%
Max Drawdown (3Y) Largest decline over 3 years	-18.74%	-13.69%	-5.05%
Max Drawdown (5Y) Largest decline over 5 years	-24.49%	-26.80%	+2.31%
Max Drawdown (10Y) Largest decline over 10 years	-33.77%	-29.22%	-4.55%
Current Drawdown Current decline from peak	-1.42%	-1.52%	+0.10%
Average Drawdown Average peak-to-trough decline	-3.89%	-4.89%	+1.00%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.07%	2.06%	+0.01%

Volatility

SSSYX vs. SSDDX - Volatility Comparison

State Street Equity 500 Index Fund Class K (SSSYX) has a higher volatility of 3.52% compared to State Street Target Retirement 2045 Fund (SSDDX) at 3.34%. This indicates that SSSYX's price experiences larger fluctuations and is considered to be riskier than SSDDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SSSYX	SSDDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.52%	3.34%	+0.18%
Volatility (6M) Calculated over the trailing 6-month period	10.10%	9.55%	+0.55%
Volatility (1Y) Calculated over the trailing 1-year period	12.86%	11.41%	+1.45%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.00%	13.56%	+3.44%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	121.13%	14.23%	+106.90%

SSSYX vs. SSDDX - Expense Ratio Comparison

SSSYX has a 0.02% expense ratio, which is lower than SSDDX's 0.18% 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

SSSYX vs. SSDDX - Dividend Comparison

SSSYX's dividend yield for the trailing twelve months is around 1.31%, less than SSDDX's 6.11% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSDDX State Street Target Retirement 2045 Fund	6.11%	6.67%	4.90%	3.56%	5.36%	4.88%	4.04%	6.21%	5.00%	0.43%	1.72%	1.87%
SSSYX State Street Equity 500 Index Fund Class K	1.31%	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 SSSYX and SSDDX in my portfolio?

With a correlation of 0.92, SSSYX and SSDDX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, SSSYX or SSDDX?

SSSYX has higher volatility (3.52%) compared to SSDDX (3.34%). In terms of maximum drawdown, SSSYX dropped -33.77% vs SSDDX's -29.22%.

Which has better risk-adjusted returns?

SSDDX currently has the higher Sharpe Ratio (1.66 vs 1.52), 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.