RFNBX vs. YFSIX

Last updated Aug 1, 2026

RFNBX (American Funds Fundamental Investors Fund Class R2) and YFSIX (AMG Yacktman Global Fund) are both mutual funds - RFNBX is a Large Cap Blend Equities fund actively managed by Capital Group, while YFSIX is a Global Equities fund managed by AMG. Over the past 5 years, RFNBX returned 12.85%/yr vs 9.02%/yr for YFSIX. Their 0.73 correlation means they have sometimes moved together and sometimes differently. RFNBX charges 1.36%/yr vs 0.95%/yr for YFSIX.

Performance

RFNBX vs. YFSIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Fundamental Investors Fund Class R2 (RFNBX) and AMG Yacktman Global Fund (YFSIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RFNBX achieves a 11.62% return, which is significantly lower than YFSIX's 24.97% return.

RFNBX

• 1D: 2.11%
• 1M: -1.04%
• 6M: 7.56%
• YTD: 11.62%
• 1Y: 23.68%
• 3Y*: 21.05%
• 5Y*: 12.85%
• 10Y*: 13.26%
• ALL TIME*: 10.76%

YFSIX

• 1D: 3.06%
• 1M: 4.28%
• 6M: 14.11%
• YTD: 24.97%
• 1Y: 22.32%
• 3Y*: 15.02%
• 5Y*: 9.02%
• 10Y*: —
• ALL TIME*: 12.76%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
RFNBX American Funds Fundamental Investors Fund Class R2	$0.00	$0.00	$0.00
YFSIX AMG Yacktman Global Fund	$0.00	$0.00	$0.00

RFNBX vs. YFSIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RFNBX American Funds Fundamental Investors Fund Class R2	11.62%	23.22%	21.80%	24.89%	-17.32%	21.49%	12.51%	26.09%	-8.89%	18.41%
YFSIX AMG Yacktman Global Fund	24.97%	14.91%	-0.34%	16.64%	-9.15%	13.13%	18.46%	24.40%	2.18%	20.95%

Correlation

The correlation between RFNBX and YFSIX is 0.54, which is moderate. They have sometimes moved together and sometimes differently, sharing some price drivers without tracking each other closely.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.54
Correlation (3Y) Balances recent behavior with more history.	0.58
Correlation (5Y) Shows whether the relationship held over a longer period.	0.69
Correlation (All Time) Calculated using the full available price history since Feb 2, 2017	0.73

The correlation between RFNBX and YFSIX shifts across timeframes, from 0.54 (1 year) to 0.73 (all time), reflecting how their relationship changes across market environments.

Return for Risk

RFNBX vs. YFSIX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

RFNBX

RFNBX Risk / Return Rank: 53
RFNBX Sharpe Ratio Rank: 51
RFNBX Sortino Ratio Rank: 48
RFNBX Omega Ratio Rank: 47
RFNBX Calmar Ratio Rank: 52
RFNBX Martin Ratio Rank: 66

YFSIX

YFSIX Risk / Return Rank: 29
YFSIX Sharpe Ratio Rank: 26
YFSIX Sortino Ratio Rank: 20
YFSIX Omega Ratio Rank: 40
YFSIX Calmar Ratio Rank: 33
YFSIX Martin Ratio Rank: 29

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

RFNBX vs. YFSIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Fundamental Investors Fund Class R2 (RFNBX) 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.

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.

	RFNBX	YFSIX	Difference
Sharpe ratio: Return per unit of total volatility	1.40	0.88	+0.52
Sortino ratio: Return per unit of downside risk	1.98	1.10	+0.88
Omega ratio: Gain probability vs. loss probability	1.25	1.22	+0.03
Calmar ratio: Return relative to maximum drawdown	1.98	1.41	+0.56
Martin ratio: Return relative to average drawdown	8.47	4.10	+4.37

RFNBX vs. YFSIX - Sharpe Ratio Comparison

The current RFNBX Sharpe Ratio is 1.40, which is higher than the YFSIX Sharpe Ratio of 0.88. The chart below compares the historical Sharpe Ratios of RFNBX and YFSIX, 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

RFNBX vs. YFSIX - Drawdown Comparison

The maximum RFNBX drawdown since its inception was -53.81%, which is greater than YFSIX's maximum drawdown of -35.10%. Use the drawdown chart below to compare losses from any high point for RFNBX and YFSIX.

Drawdown Indicators

	RFNBX	YFSIX	Difference
Max Drawdown Largest peak-to-trough decline	-53.81%	-35.10%	-18.71%
Max Drawdown (1Y) Largest decline over 1 year	-10.78%	-14.20%	+3.42%
Max Drawdown (3Y) Largest decline over 3 years	-18.11%	-14.20%	-3.91%
Max Drawdown (5Y) Largest decline over 5 years	-25.53%	-25.14%	-0.39%
Max Drawdown (10Y) Largest decline over 10 years	-33.96%	—	—
Current Drawdown Current decline from peak	-2.74%	-2.55%	-0.19%
Average Drawdown Average peak-to-trough decline	-7.21%	-4.89%	-2.32%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.51%	4.86%	-2.35%

Volatility

RFNBX vs. YFSIX - Volatility Comparison

The current volatility for American Funds Fundamental Investors Fund Class R2 (RFNBX) is 4.22%, while AMG Yacktman Global Fund (YFSIX) has a volatility of 5.69%. This indicates that RFNBX 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

	RFNBX	YFSIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.22%	5.69%	-1.47%
Volatility (6M) Calculated over the trailing 6-month period	12.13%	15.90%	-3.77%
Volatility (1Y) Calculated over the trailing 1-year period	15.16%	22.66%	-7.50%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	17.01%	15.78%	+1.23%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.77%	16.36%	+1.41%

RFNBX vs. YFSIX - Expense Ratio Comparison

RFNBX has a 1.36% expense ratio, which is higher than YFSIX's 0.95% expense ratio.

Dividends

RFNBX vs. YFSIX - Dividend Comparison

RFNBX's dividend yield for the trailing twelve months is around 6.84%, while YFSIX has not paid dividends to shareholders.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
RFNBX American Funds Fundamental Investors Fund Class R2	6.84%	7.90%	8.19%	5.13%	4.16%	10.27%	0.83%	6.20%	8.38%	6.54%	3.99%	5.32%
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 RFNBX and YFSIX in my portfolio?

RFNBX and YFSIX have a correlation of 0.54, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RFNBX or YFSIX?

YFSIX has higher volatility (5.69%) compared to RFNBX (4.22%). In terms of maximum drawdown, RFNBX dropped -53.81% vs YFSIX's -35.10%.

Which has better risk-adjusted returns?

RFNBX currently has the higher Sharpe Ratio (1.40 vs 0.88), 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.