YAFFX vs. FXAIX

Last updated Jun 13, 2026

YAFFX (AMG Yacktman Focused Fund) and FXAIX (Fidelity 500 Index Fund) are both mutual funds - YAFFX is a Large Cap Value Equities fund managed by AMG, while FXAIX is a S&P 500 fund tracking the S&P 500 Index. Over the past 10 years, YAFFX returned 12.50%/yr vs 15.44%/yr for FXAIX. Their correlation of 0.81 suggests significant overlap in exposure. YAFFX charges 1.25%/yr vs 0.02%/yr for FXAIX.

Performance

YAFFX vs. FXAIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AMG Yacktman Focused Fund (YAFFX) and Fidelity 500 Index Fund (FXAIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, YAFFX achieves a 25.77% return, which is significantly higher than FXAIX's 8.59% return. Over the past 10 years, YAFFX has underperformed FXAIX with an annualized return of 12.50%, while FXAIX has yielded a comparatively higher 15.44% annualized return.

YAFFX

• 1D: 2.63%
• 1M: 1.94%
• YTD: 25.77%
• 6M: 8.10%
• 1Y: 21.71%
• 3Y*: 16.12%
• 5Y*: 9.34%
• 10Y*: 12.50%

FXAIX

• 1D: 1.76%
• 1M: -0.09%
• YTD: 8.59%
• 6M: 8.94%
• 1Y: 25.18%
• 3Y*: 21.06%
• 5Y*: 13.34%
• 10Y*: 15.44%

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

YAFFX vs. FXAIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
YAFFX AMG Yacktman Focused Fund	25.77%	3.89%	9.30%	16.53%	-8.20%	16.48%	17.22%	19.21%	2.99%	20.07%
FXAIX Fidelity 500 Index Fund	8.59%	17.84%	25.01%	26.29%	-18.14%	28.71%	18.42%	31.48%	-4.43%	21.82%

Correlation

The correlation between YAFFX and FXAIX is 0.48, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.48
Correlation (3Y) Calculated over the trailing 3-year period	0.63
Correlation (5Y) Calculated over the trailing 5-year period	0.74
Correlation (10Y) Calculated over the trailing 10-year period	0.76
Correlation (All Time) Calculated using the full available price history since May 4, 2011	0.81

Over the past year, the correlation between YAFFX and FXAIX has dropped to 0.48 - well below their long-term average of 0.81, suggesting their price drivers have been diverging.

Return for Risk

YAFFX vs. FXAIX — Risk / Return Rank

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

YAFFX

YAFFX Risk / Return Rank: 22
YAFFX Sharpe Ratio Rank: 18
YAFFX Sortino Ratio Rank: 13
YAFFX Omega Ratio Rank: 39
YAFFX Calmar Ratio Rank: 20
YAFFX Martin Ratio Rank: 22

FXAIX

FXAIX Risk / Return Rank: 73
FXAIX Sharpe Ratio Rank: 72
FXAIX Sortino Ratio Rank: 68
FXAIX Omega Ratio Rank: 69
FXAIX Calmar Ratio Rank: 73
FXAIX 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.

YAFFX vs. FXAIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AMG Yacktman Focused Fund (YAFFX) and Fidelity 500 Index Fund (FXAIX). 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.

	YAFFX	FXAIX	Difference
Sharpe ratio: Return per unit of total volatility	0.94	1.97	-1.03
Sortino ratio: Return per unit of downside risk	1.12	2.67	-1.55
Omega ratio: Gain probability vs. loss probability	1.26	1.36	-0.10
Calmar ratio: Return relative to maximum drawdown	1.26	2.74	-1.48
Martin ratio: Return relative to average drawdown	4.47	12.46	-7.99

YAFFX vs. FXAIX - Sharpe Ratio Comparison

The current YAFFX Sharpe Ratio is 0.94, which is lower than the FXAIX Sharpe Ratio of 1.97. The chart below compares the historical Sharpe Ratios of YAFFX and FXAIX, 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

YAFFX vs. FXAIX - Drawdown Comparison

The maximum YAFFX drawdown since its inception was -43.80%, which is greater than FXAIX's maximum drawdown of -33.79%. Use the drawdown chart below to compare losses from any high point for YAFFX and FXAIX.

Drawdown Indicators

	YAFFX	FXAIX	Difference
Max Drawdown Largest peak-to-trough decline	-43.80%	-33.79%	-10.01%
Max Drawdown (1Y) Largest decline over 1 year	-17.08%	-8.89%	-8.19%
Max Drawdown (3Y) Largest decline over 3 years	-18.88%	-18.76%	-0.12%
Max Drawdown (5Y) Largest decline over 5 years	-21.31%	-24.50%	+3.19%
Max Drawdown (10Y) Largest decline over 10 years	-30.62%	-33.79%	+3.17%
Current Drawdown Current decline from peak	-4.28%	-2.79%	-1.49%
Average Drawdown Average peak-to-trough decline	-6.21%	-3.79%	-2.42%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.77%	1.95%	+2.82%

Volatility

YAFFX vs. FXAIX - Volatility Comparison

AMG Yacktman Focused Fund (YAFFX) has a higher volatility of 7.30% compared to Fidelity 500 Index Fund (FXAIX) at 4.44%. This indicates that YAFFX's price experiences larger fluctuations and is considered to be riskier than FXAIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	YAFFX	FXAIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.30%	4.44%	+2.86%
Volatility (6M) Calculated over the trailing 6-month period	22.77%	9.70%	+13.07%
Volatility (1Y) Calculated over the trailing 1-year period	22.71%	12.37%	+10.34%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.22%	16.99%	+1.23%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.59%	18.10%	-1.51%

YAFFX vs. FXAIX - Expense Ratio Comparison

YAFFX has a 1.25% expense ratio, which is higher than FXAIX's 0.02% expense ratio.

Dividends

YAFFX vs. FXAIX - Dividend Comparison

YAFFX has not paid dividends to shareholders, while FXAIX's dividend yield for the trailing twelve months is around 1.06%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FXAIX Fidelity 500 Index Fund	1.06%	1.11%	1.25%	1.45%	1.69%	1.22%	1.60%	2.06%	2.72%	1.97%	2.52%	2.83%
YAFFX AMG Yacktman Focused Fund	0.00%	0.00%	18.44%	4.42%	7.60%	4.70%	11.87%	15.84%	22.15%	11.82%	11.81%	24.36%

Frequently Asked Questions

Can I hold both YAFFX and FXAIX in my portfolio?

YAFFX and FXAIX have a correlation of 0.48, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, YAFFX or FXAIX?

YAFFX has higher volatility (7.30%) compared to FXAIX (4.44%). In terms of maximum drawdown, YAFFX dropped -43.80% vs FXAIX's -33.79%.

Which has better risk-adjusted returns?

FXAIX currently has the higher Sharpe Ratio (1.97 vs 0.94), 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.