SAMKX vs. SSSYX

Last updated Jun 3, 2026

SAMKX (SA U.S. Core Market Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both Large Cap Blend Equities funds. Over the past 10 years, SAMKX returned 14.65%/yr vs 15.59%/yr for SSSYX. With a 0.96 correlation, they move nearly in lockstep. SAMKX charges 0.67%/yr vs 0.02%/yr for SSSYX.

Performance

SAMKX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in SA U.S. Core Market Fund (SAMKX) 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, SAMKX achieves a 10.49% return, which is significantly lower than SSSYX's 11.54% return. Over the past 10 years, SAMKX has underperformed SSSYX with an annualized return of 14.65%, while SSSYX has yielded a comparatively higher 15.59% annualized return.

SAMKX

• 1D: 0.13%
• 1M: 4.35%
• YTD: 10.49%
• 6M: 10.75%
• 1Y: 27.03%
• 3Y*: 20.89%
• 5Y*: 12.72%
• 10Y*: 14.65%

SSSYX

• 1D: 0.27%
• 1M: 5.23%
• YTD: 11.54%
• 6M: 11.91%
• 1Y: 29.51%
• 3Y*: 22.67%
• 5Y*: 14.13%
• 10Y*: 15.59%

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

SAMKX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
SAMKX SA U.S. Core Market Fund	10.49%	15.80%	22.80%	25.81%	-18.91%	25.66%	18.88%	30.56%	-4.69%	22.20%
SSSYX State Street Equity 500 Index Fund Class K	11.54%	17.81%	24.99%	26.27%	-18.16%	28.51%	18.31%	31.38%	-4.38%	21.61%

Correlation

The correlation between SAMKX and SSSYX is 0.86, 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	0.86
Correlation (3Y) Calculated over the trailing 3-year period	0.87
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Sep 19, 2014	0.96

The correlation between SAMKX and SSSYX has been stable across timeframes, ranging from 0.86 to 0.96 - a consistent structural relationship.

Return for Risk

SAMKX vs. SSSYX — Risk / Return Rank

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

SAMKX

SAMKX Risk / Return Rank: 84
SAMKX Sharpe Ratio Rank: 83
SAMKX Sortino Ratio Rank: 80
SAMKX Omega Ratio Rank: 74
SAMKX Calmar Ratio Rank: 89
SAMKX Martin Ratio Rank: 94

SSSYX

SSSYX Risk / Return Rank: 74
SSSYX Sharpe Ratio Rank: 77
SSSYX Sortino Ratio Rank: 69
SSSYX Omega Ratio Rank: 69
SSSYX Calmar Ratio Rank: 74
SSSYX Martin Ratio Rank: 84

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.

SAMKX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for SA U.S. Core Market Fund (SAMKX) 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.

	SAMKX	SSSYX	Difference
Sharpe ratio Return per unit of total volatility	2.69	2.55	+0.15
Sortino ratio Return per unit of downside risk	3.80	3.46	+0.34
Omega ratio Gain probability vs. loss probability	1.48	1.46	+0.02
Calmar ratio Return relative to maximum drawdown	4.54	3.38	+1.15
Martin ratio Return relative to average drawdown	21.38	15.85	+5.53
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

SAMKX vs. SSSYX - Sharpe Ratio Comparison

The current SAMKX Sharpe Ratio is 2.69, which is comparable to the SSSYX Sharpe Ratio of 2.55. The chart below compares the historical Sharpe Ratios of SAMKX 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

	SAMKX	SSSYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.69	2.55	+0.15
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.78	0.84	-0.06
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.85	0.13	+0.72
Sharpe Ratio (All Time) Calculated using the full available price history	0.87	0.12	+0.76

Drawdowns

SAMKX vs. SSSYX - Drawdown Comparison

The maximum SAMKX drawdown since its inception was -33.77%, smaller than the maximum SSSYX drawdown of -91.48%. Use the drawdown chart below to compare losses from any high point for SAMKX and SSSYX.

Drawdown Indicators

	SAMKX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-33.77%	-91.48%	+57.71%
Max Drawdown (1Y) Largest decline over 1 year	-8.75%	-8.88%	+0.13%
Max Drawdown (3Y) Largest decline over 3 years	-19.29%	-18.74%	-0.55%
Max Drawdown (5Y) Largest decline over 5 years	-24.88%	-24.49%	-0.39%
Max Drawdown (10Y) Largest decline over 10 years	-33.77%	-91.48%	+57.71%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-3.93%	-4.15%	+0.22%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.86%	1.90%	-0.04%

Volatility

SAMKX vs. SSSYX - Volatility Comparison

The current volatility for SA U.S. Core Market Fund (SAMKX) is 2.29%, while State Street Equity 500 Index Fund Class K (SSSYX) has a volatility of 2.82%. This indicates that SAMKX 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

	SAMKX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.29%	2.82%	-0.53%
Volatility (6M) Calculated over the trailing 6-month period	8.59%	8.98%	-0.39%
Volatility (1Y) Calculated over the trailing 1-year period	11.50%	11.88%	-0.38%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.85%	16.88%	-0.03%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.54%	124.46%	-106.92%

SAMKX vs. SSSYX - Expense Ratio Comparison

SAMKX has a 0.67% expense ratio, which is higher than SSSYX's 0.02% expense ratio.

Dividends

SAMKX vs. SSSYX - Dividend Comparison

SAMKX's dividend yield for the trailing twelve months is around 0.60%, less than SSSYX's 1.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
SAMKX SA U.S. Core Market Fund	0.60%	0.66%	0.69%	0.86%	5.83%	7.72%	8.08%	12.72%	6.46%	4.09%	6.20%	0.89%
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 SAMKX and SSSYX in my portfolio?

SAMKX and SSSYX have a correlation of 0.86, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, SAMKX or SSSYX?

SSSYX has higher volatility (2.82%) compared to SAMKX (2.29%). In terms of maximum drawdown, SAMKX dropped -33.77% vs SSSYX's -91.48%.

Which has better risk-adjusted returns?

SAMKX currently has the higher Sharpe Ratio (2.69 vs 2.55), 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.