YFSIX vs. SSSYX

Last updated Jun 4, 2026

YFSIX (AMG Yacktman Global Fund) and SSSYX (State Street Equity 500 Index Fund Class K) are both Large Cap Blend Equities funds. Over the past 5 years, YFSIX returned 9.09%/yr vs 14.24%/yr for SSSYX. A 0.69 correlation means they provide meaningful diversification when combined. YFSIX charges 0.95%/yr vs 0.02%/yr for SSSYX.

Performance

YFSIX vs. SSSYX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG Yacktman Global Fund (YFSIX) 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, YFSIX achieves a 27.94% return, which is significantly higher than SSSYX's 11.69% return.

YFSIX

• 1D: -0.24%
• 1M: 5.24%
• YTD: 27.94%
• 6M: 15.38%
• 1Y: 32.86%
• 3Y*: 17.40%
• 5Y*: 9.09%
• 10Y*: —

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)

YFSIX vs. SSSYX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
YFSIX AMG Yacktman Global Fund	27.94%	14.91%	-0.34%	16.64%	-9.15%	13.13%	18.46%	24.40%	2.18%	20.95%
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%	19.27%

Correlation

The correlation between YFSIX and SSSYX is 0.42, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.42
Correlation (3Y) Calculated over the trailing 3-year period	0.54
Correlation (5Y) Calculated over the trailing 5-year period	0.65
Correlation (All Time) Calculated using the full available price history since Feb 3, 2017	0.69

Over the past year, the correlation between YFSIX and SSSYX has dropped to 0.42 - well below their long-term average of 0.69, suggesting their price drivers have been diverging.

Return for Risk

YFSIX vs. SSSYX — Risk / Return Rank

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

YFSIX

YFSIX Risk / Return Rank: 32
YFSIX Sharpe Ratio Rank: 29
YFSIX Sortino Ratio Rank: 17
YFSIX Omega Ratio Rank: 47
YFSIX Calmar Ratio Rank: 37
YFSIX Martin Ratio Rank: 32

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.

YFSIX vs. SSSYX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG Yacktman Global Fund (YFSIX) 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.

	YFSIX	SSSYX	Difference
Sharpe ratio: Return per unit of total volatility	1.54	2.52	-0.98
Sortino ratio: Return per unit of downside risk	1.70	3.42	-1.72
Omega ratio: Gain probability vs. loss probability	1.37	1.46	-0.09
Calmar ratio: Return relative to maximum drawdown	2.31	3.36	-1.05
Martin ratio: Return relative to average drawdown	7.30	15.69	-8.39
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

YFSIX vs. SSSYX - Sharpe Ratio Comparison

The current YFSIX Sharpe Ratio is 1.54, which is lower than the SSSYX Sharpe Ratio of 2.52. The chart below compares the historical Sharpe Ratios of YFSIX 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

	YFSIX	SSSYX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.54	2.52	-0.98
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.59	0.85	-0.25
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.13	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.82	0.12	+0.70

Drawdowns

YFSIX vs. SSSYX - Drawdown Comparison

The maximum YFSIX drawdown since its inception was -35.10%, smaller than the maximum SSSYX drawdown of -91.48%. Use the drawdown chart below to compare losses from any high point for YFSIX and SSSYX.

Drawdown Indicators

	YFSIX	SSSYX	Difference
Max Drawdown Largest peak-to-trough decline	-35.10%	-91.48%	+56.38%
Max Drawdown (1Y) Largest decline over 1 year	-14.20%	-8.88%	-5.32%
Max Drawdown (3Y) Largest decline over 3 years	-14.20%	-18.74%	+4.54%
Max Drawdown (5Y) Largest decline over 5 years	-25.14%	-24.49%	-0.65%
Max Drawdown (10Y) Largest decline over 10 years	—	-91.48%	—
Current Drawdown Current decline from peak	-0.24%	0.00%	-0.24%
Average Drawdown Average peak-to-trough decline	-4.90%	-4.15%	-0.75%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.47%	1.90%	+2.57%

Volatility

YFSIX vs. SSSYX - Volatility Comparison

AMG Yacktman Global Fund (YFSIX) has a higher volatility of 5.82% compared to State Street Equity 500 Index Fund Class K (SSSYX) at 2.82%. This indicates that YFSIX'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

	YFSIX	SSSYX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.82%	2.82%	+3.00%
Volatility (6M) Calculated over the trailing 6-month period	20.77%	8.96%	+11.81%
Volatility (1Y) Calculated over the trailing 1-year period	21.35%	11.85%	+9.50%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	15.39%	16.88%	-1.49%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.25%	124.46%	-108.21%

YFSIX vs. SSSYX - Expense Ratio Comparison

YFSIX has a 0.95% expense ratio, which is higher than SSSYX's 0.02% expense ratio.

Dividends

YFSIX vs. SSSYX - Dividend Comparison

YFSIX has not paid dividends to shareholders, while SSSYX's dividend yield for the trailing twelve months is around 1.29%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
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%
YFSIX AMG Yacktman Global Fund	0.00%	0.00%	8.68%	8.02%	4.32%	8.18%	4.76%	6.59%	0.71%	2.63%	0.00%	0.00%

Frequently Asked Questions

Can I hold both YFSIX and SSSYX in my portfolio?

YFSIX and SSSYX have a correlation of 0.42, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, YFSIX or SSSYX?

YFSIX has higher volatility (5.82%) compared to SSSYX (2.82%). In terms of maximum drawdown, YFSIX dropped -35.10% vs SSSYX's -91.48%.

Which has better risk-adjusted returns?

SSSYX currently has the higher Sharpe Ratio (2.52 vs 1.54), 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.