SSDOX vs. SSSYX

Last updated Jun 3, 2026

SSDOX (State Street Target Retirement 2055 Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both mutual funds - SSDOX is a Target Retirement Date fund managed by State Street, while SSSYX is a Large Cap Blend Equities fund tracking the S&P 500 Index. Over the past 10 years, SSDOX returned 11.16%/yr vs 15.61%/yr for SSSYX. Their correlation of 0.92 suggests significant overlap in exposure. SSDOX charges 0.21%/yr vs 0.02%/yr for SSSYX.

Performance

SSDOX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in State Street Target Retirement 2055 Fund (SSDOX) and State Street Equity 500 Index Fund Class K (SSSYX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both investments are quite close, with SSDOX having a 11.53% return and SSSYX slightly higher at 11.69%. Over the past 10 years, SSDOX has underperformed SSSYX with an annualized return of 11.16%, while SSSYX has yielded a comparatively higher 15.61% annualized return.

SSDOX

• 1D: 0.00%
• 1M: 4.11%
• YTD: 11.53%
• 6M: 12.81%
• 1Y: 27.48%
• 3Y*: 18.44%
• 5Y*: 8.65%
• 10Y*: 11.16%

SSSYX

• 1D: 0.14%
• 1M: 5.79%
• YTD: 11.69%
• 6M: 11.73%
• 1Y: 28.94%
• 3Y*: 22.73%
• 5Y*: 14.24%
• 10Y*: 15.61%

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

SSDOX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SSDOX State Street Target Retirement 2055 Fund	11.53%	21.02%	12.37%	19.35%	-19.27%	13.32%	19.62%	25.62%	-7.91%	19.22%
SSSYX State Street Equity 500 Index Fund Class K	11.69%	17.81%	24.99%	26.27%	-18.16%	28.51%	18.31%	31.38%	-4.38%	21.61%

Correlation

The correlation between SSDOX 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 2, 2014	0.92

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

Return for Risk

SSDOX vs. SSSYX — Risk / Return Rank

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

SSDOX

SSDOX Risk / Return Rank: 71
SSDOX Sharpe Ratio Rank: 75
SSDOX Sortino Ratio Rank: 71
SSDOX Omega Ratio Rank: 73
SSDOX Calmar Ratio Rank: 67
SSDOX Martin Ratio Rank: 70

SSSYX

SSSYX Risk / Return Rank: 73
SSSYX Sharpe Ratio Rank: 75
SSSYX Sortino Ratio Rank: 67
SSSYX Omega Ratio Rank: 67
SSSYX Calmar Ratio Rank: 74
SSSYX Martin Ratio Rank: 83

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.

SSDOX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for State Street Target Retirement 2055 Fund (SSDOX) 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.

	SSDOX	SSSYX	Difference
Sharpe ratio Return per unit of total volatility	2.51	2.52	-0.01
Sortino ratio Return per unit of downside risk	3.51	3.42	+0.09
Omega ratio Gain probability vs. loss probability	1.48	1.46	+0.02
Calmar ratio Return relative to maximum drawdown	3.16	3.36	-0.19
Martin ratio Return relative to average drawdown	13.49	15.69	-2.19
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SSDOX vs. SSSYX - Sharpe Ratio Comparison

The current SSDOX Sharpe Ratio is 2.51, which is comparable to the SSSYX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of SSDOX 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.

Sharpe Ratios by Period

	SSDOX	SSSYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.51	2.52	-0.01
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.61	0.85	-0.24
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.76	0.13	+0.63
Sharpe Ratio (All Time) Calculated using the full available price history	0.68	0.12	+0.56

Drawdowns

SSDOX vs. SSSYX - Drawdown Comparison

The maximum SSDOX drawdown since its inception was -29.85%, smaller than the maximum SSSYX drawdown of -91.48%. Use the drawdown chart below to compare losses from any high point for SSDOX and SSSYX.

Drawdown Indicators

	SSDOX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-29.85%	-91.48%	+61.63%
Max Drawdown (1Y) Largest decline over 1 year	-8.92%	-8.88%	-0.04%
Max Drawdown (3Y) Largest decline over 3 years	-15.04%	-18.74%	+3.70%
Max Drawdown (5Y) Largest decline over 5 years	-27.44%	-24.49%	-2.95%
Max Drawdown (10Y) Largest decline over 10 years	-29.85%	-91.48%	+61.63%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-5.04%	-4.15%	-0.89%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.09%	1.90%	+0.19%

Volatility

SSDOX vs. SSSYX - Volatility Comparison

State Street Target Retirement 2055 Fund (SSDOX) has a higher volatility of 3.41% compared to State Street Equity 500 Index Fund Class K (SSSYX) at 2.82%. This indicates that SSDOX'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

	SSDOX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.41%	2.82%	+0.59%
Volatility (6M) Calculated over the trailing 6-month period	9.03%	8.96%	+0.07%
Volatility (1Y) Calculated over the trailing 1-year period	11.27%	11.85%	-0.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.25%	16.88%	-2.63%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	14.82%	124.46%	-109.64%

SSDOX vs. SSSYX - Expense Ratio Comparison

SSDOX has a 0.21% 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

SSDOX vs. SSSYX - Dividend Comparison

SSDOX's dividend yield for the trailing twelve months is around 4.35%, more than SSSYX's 1.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SSDOX State Street Target Retirement 2055 Fund	4.35%	4.85%	4.45%	2.99%	4.97%	4.39%	3.03%	6.02%	5.38%	0.44%	1.71%	2.03%
SSSYX State Street Equity 500 Index Fund Class K	1.29%	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 SSDOX and SSSYX in my portfolio?

With a correlation of 0.92, SSDOX 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, SSDOX or SSSYX?

SSDOX has higher volatility (3.41%) compared to SSSYX (2.82%). In terms of maximum drawdown, SSDOX dropped -29.85% vs SSSYX's -91.48%.

Which has better risk-adjusted returns?

SSSYX currently has the higher Sharpe Ratio (2.52 vs 2.51), 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.