SSDDX vs. SSSYX

Last updated Jun 24, 2026

SSDDX (State Street Target Retirement 2045 Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both mutual funds - SSDDX is a Target Retirement Date fund managed by State Street, while SSSYX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, SSDDX returned 11.11%/yr vs 45.70%/yr for SSSYX. Their correlation of 0.92 suggests significant overlap in exposure. SSDDX charges 0.18%/yr vs 0.02%/yr for SSSYX.

Performance

SSDDX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Target Retirement 2045 Fund (SSDDX) 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, SSDDX achieves a 10.49% return, which is significantly higher than SSSYX's 9.78% return. Over the past 10 years, SSDDX has underperformed SSSYX with an annualized return of 11.11%, while SSSYX has yielded a comparatively higher 45.70% annualized return.

SSDDX

• 1D: -0.11%
• 1M: 1.66%
• YTD: 10.49%
• 6M: 9.86%
• 1Y: 24.24%
• 3Y*: 17.05%
• 5Y*: 8.05%
• 10Y*: 11.11%

SSSYX

• 1D: -0.36%
• 1M: 0.10%
• YTD: 9.78%
• 6M: 8.78%
• 1Y: 25.47%
• 3Y*: 21.36%
• 5Y*: 13.57%
• 10Y*: 45.70%

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

SSDDX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SSDDX State Street Target Retirement 2045 Fund	10.49%	19.92%	11.80%	18.48%	-18.97%	13.08%	19.28%	25.41%	-7.95%	19.14%
SSSYX State Street Equity 500 Index Fund Class K	9.78%	17.81%	24.99%	26.27%	-18.16%	28.51%	1,083.11%	31.38%	-4.38%	21.61%

Correlation

The correlation between SSDDX and SSSYX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.92
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since Oct 1, 2014	0.92

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

Return for Risk

SSDDX vs. SSSYX — Risk / Return Rank

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

SSDDX

SSDDX Risk / Return Rank: 70
SSDDX Sharpe Ratio Rank: 72
SSDDX Sortino Ratio Rank: 68
SSDDX Omega Ratio Rank: 73
SSDDX Calmar Ratio Rank: 66
SSDDX Martin Ratio Rank: 69

SSSYX

SSSYX Risk / Return Rank: 65
SSSYX Sharpe Ratio Rank: 63
SSSYX Sortino Ratio Rank: 57
SSSYX Omega Ratio Rank: 59
SSSYX Calmar Ratio Rank: 68
SSSYX Martin Ratio Rank: 78

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.

SSDDX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Target Retirement 2045 Fund (SSDDX) 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.

	SSDDX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	2.27	2.15	+0.12
Sortino ratio: Return per unit of downside risk	3.15	2.91	+0.24
Omega ratio: Gain probability vs. loss probability	1.44	1.39	+0.05
Calmar ratio: Return relative to maximum drawdown	2.99	3.02	-0.02
Martin ratio: Return relative to average drawdown	12.51	13.62	-1.11

SSDDX vs. SSSYX - Sharpe Ratio Comparison

The current SSDDX Sharpe Ratio is 2.27, which is comparable to the SSSYX Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of SSDDX 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

SSDDX vs. SSSYX - Drawdown Comparison

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

Drawdown Indicators

	SSDDX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-29.22%	-33.77%	+4.55%
Max Drawdown (1Y) Largest decline over 1 year	-8.35%	-8.88%	+0.53%
Max Drawdown (3Y) Largest decline over 3 years	-13.69%	-18.74%	+5.05%
Max Drawdown (5Y) Largest decline over 5 years	-26.80%	-24.49%	-2.31%
Max Drawdown (10Y) Largest decline over 10 years	-29.22%	-33.77%	+4.55%
Current Drawdown Current decline from peak	-0.38%	-1.72%	+1.34%
Average Drawdown Average peak-to-trough decline	-4.92%	-3.91%	-1.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.99%	1.96%	+0.03%

Volatility

SSDDX vs. SSSYX - Volatility Comparison

The current volatility for State Street Target Retirement 2045 Fund (SSDDX) is 4.38%, while State Street Equity 500 Index Fund Class K (SSSYX) has a volatility of 4.67%. This indicates that SSDDX experiences smaller price fluctuations and is considered to be less risky than SSSYX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	SSDDX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.38%	4.67%	-0.29%
Volatility (6M) Calculated over the trailing 6-month period	9.14%	9.83%	-0.69%
Volatility (1Y) Calculated over the trailing 1-year period	11.02%	12.49%	-1.47%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	13.52%	16.98%	-3.46%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.30%	121.18%	-106.88%

SSDDX vs. SSSYX - Expense Ratio Comparison

SSDDX has a 0.18% 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

SSDDX vs. SSSYX - Dividend Comparison

SSDDX's dividend yield for the trailing twelve months is around 6.04%, more than SSSYX's 1.31% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSDDX State Street Target Retirement 2045 Fund	6.04%	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 SSDDX and SSSYX in my portfolio?

With a correlation of 0.92, SSDDX and SSSYX 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, SSDDX or SSSYX?

SSSYX has higher volatility (4.67%) compared to SSDDX (4.38%). In terms of maximum drawdown, SSDDX dropped -29.22% vs SSSYX's -33.77%.

Which has better risk-adjusted returns?

SSDDX currently has the higher Sharpe Ratio (2.27 vs 2.15), 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.