PREIX vs. YFSIX

Last updated Apr 1, 2026

Compare and contrast key facts about T. Rowe Price Equity Index 500 Fund (PREIX) and AMG Yacktman Global Fund (YFSIX).

PREIX is managed by T. Rowe Price. It was launched on Mar 30, 1990. YFSIX is managed by AMG. It was launched on Jan 30, 2017.

Performance

PREIX vs. YFSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in T. Rowe Price Equity Index 500 Fund (PREIX) and AMG Yacktman Global Fund (YFSIX). The values are adjusted to include any dividend payments, if applicable.

PREIX vs. YFSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PREIX T. Rowe Price Equity Index 500 Fund	-7.11%	19.24%	24.78%	26.07%	-18.27%	28.48%	18.17%	31.47%	-4.59%	18.65%
YFSIX AMG Yacktman Global Fund	8.16%	14.91%	-0.34%	16.64%	-9.15%	13.13%	18.46%	24.40%	2.18%	20.95%

Returns By Period

In the year-to-date period, PREIX achieves a -7.11% return, which is significantly lower than YFSIX's 8.16% return.

PREIX

• 1D: -0.39%
• 1M: -7.70%
• YTD: -7.11%
• 6M: -3.40%
• 1Y: 15.76%
• 3Y*: 17.48%
• 5Y*: 11.51%
• 10Y*: 13.66%

YFSIX

• 1D: -1.07%
• 1M: -10.67%
• YTD: 8.16%
• 6M: 0.34%
• 1Y: 22.29%
• 3Y*: 11.70%
• 5Y*: 6.73%
• 10Y*: —

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

PREIX vs. YFSIX - Expense Ratio Comparison

PREIX has a 0.15% expense ratio, which is lower than YFSIX's 0.95% expense ratio.

YFSIX

AMG Yacktman Global Fund

PREIX

T. Rowe Price Equity Index 500 Fund

Return for Risk

PREIX vs. YFSIX — Risk / Return Rank

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

PREIX

PREIX Risk / Return Rank: 52
PREIX Sharpe Ratio Rank: 48
PREIX Sortino Ratio Rank: 52
PREIX Omega Ratio Rank: 56
PREIX Calmar Ratio Rank: 47
PREIX Martin Ratio Rank: 59

YFSIX

YFSIX Risk / Return Rank: 51
YFSIX Sharpe Ratio Rank: 52
YFSIX Sortino Ratio Rank: 34
YFSIX Omega Ratio Rank: 68
YFSIX Calmar Ratio Rank: 59
YFSIX Martin Ratio Rank: 43

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.

PREIX vs. YFSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for T. Rowe Price Equity Index 500 Fund (PREIX) and AMG Yacktman Global Fund (YFSIX). 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.

	PREIX	YFSIX	Difference
Sharpe ratio Return per unit of total volatility	0.91	0.99	-0.08
Sortino ratio Return per unit of downside risk	1.40	1.16	+0.23
Omega ratio Gain probability vs. loss probability	1.22	1.26	-0.04
Calmar ratio Return relative to maximum drawdown	1.16	1.36	-0.20
Martin ratio Return relative to average drawdown	5.66	4.42	+1.25
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

PREIX vs. YFSIX - Sharpe Ratio Comparison

The current PREIX Sharpe Ratio is 0.91, which is comparable to the YFSIX Sharpe Ratio of 0.99. The chart below compares the historical Sharpe Ratios of PREIX and YFSIX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	PREIX	YFSIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.91	0.99	-0.08
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.68	0.45	+0.23
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.76	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.59	0.71	-0.12

Correlation

The correlation between PREIX and YFSIX is 0.71, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

PREIX vs. YFSIX - Dividend Comparison

PREIX's dividend yield for the trailing twelve months is around 3.97%, while YFSIX has not paid dividends to shareholders.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
PREIX T. Rowe Price Equity Index 500 Fund	3.97%	3.66%	1.17%	1.32%	1.50%	1.56%	1.97%	2.13%	2.60%	1.30%	2.03%	2.02%
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%

Drawdowns

PREIX vs. YFSIX - Drawdown Comparison

The maximum PREIX drawdown since its inception was -55.32%, which is greater than YFSIX's maximum drawdown of -35.10%. Use the drawdown chart below to compare losses from any high point for PREIX and YFSIX.

Drawdown Indicators

	PREIX	YFSIX	Difference
Max Drawdown Largest peak-to-trough decline	-55.32%	-35.10%	-20.22%
Max Drawdown (1Y) Largest decline over 1 year	-12.12%	-14.20%	+2.08%
Max Drawdown (5Y) Largest decline over 5 years	-24.60%	-25.14%	+0.54%
Max Drawdown (10Y) Largest decline over 10 years	-33.81%	—	—
Current Drawdown Current decline from peak	-8.93%	-11.03%	+2.10%
Average Drawdown Average peak-to-trough decline	-8.76%	-4.93%	-3.83%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.49%	4.38%	-1.89%

Volatility

PREIX vs. YFSIX - Volatility Comparison

The current volatility for T. Rowe Price Equity Index 500 Fund (PREIX) is 4.25%, while AMG Yacktman Global Fund (YFSIX) has a volatility of 9.23%. This indicates that PREIX experiences smaller price fluctuations and is considered to be less risky than YFSIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PREIX	YFSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.25%	9.23%	-4.98%
Volatility (6M) Calculated over the trailing 6-month period	9.03%	19.89%	-10.86%
Volatility (1Y) Calculated over the trailing 1-year period	18.09%	21.29%	-3.20%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	16.95%	15.11%	+1.84%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.06%	16.20%	+1.86%