RIRGX vs. ANCFX

Last updated Aug 1, 2026

RIRGX (American Funds Capital Income Builder Fund Class R6) and ANCFX (American Funds Fundamental Investors Class A) are both mutual funds - RIRGX is a Diversified Portfolio fund actively managed by American Funds, while ANCFX is a Large Cap Blend Equities fund actively managed by American Funds. Both are actively managed. Over the past 10 years, RIRGX returned 8.08%/yr vs 14.31%/yr for ANCFX. Their correlation of 0.87 means they have usually moved in the same direction. RIRGX charges 0.26%/yr vs 0.57%/yr for ANCFX.

Performance

RIRGX vs. ANCFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Capital Income Builder Fund Class R6 (RIRGX) and American Funds Fundamental Investors Class A (ANCFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, RIRGX achieves a 10.56% return, which is significantly lower than ANCFX's 12.13% return. Over the past 10 years, RIRGX has underperformed ANCFX with an annualized return of 8.08%, while ANCFX has yielded a comparatively higher 14.31% annualized return.

RIRGX

• 1D: 0.74%
• 1M: 1.61%
• 6M: 7.10%
• YTD: 10.56%
• 1Y: 19.19%
• 3Y*: 14.80%
• 5Y*: 9.34%
• 10Y*: 8.08%
• ALL TIME*: 7.87%

ANCFX

• 1D: 2.12%
• 1M: -0.98%
• 6M: 7.99%
• YTD: 12.13%
• 1Y: 24.66%
• 3Y*: 22.00%
• 5Y*: 13.74%
• 10Y*: 14.31%
• ALL TIME*: 11.21%

*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)
ANCFX American Funds Fundamental Investors Class A	$0.00	$0.00	$0.00
RIRGX American Funds Capital Income Builder Fund Class R6	$0.00	$0.00	$0.00

RIRGX vs. ANCFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
RIRGX American Funds Capital Income Builder Fund Class R6	10.56%	20.76%	9.78%	9.31%	-6.85%	15.39%	3.31%	17.61%	-6.75%	14.30%
ANCFX American Funds Fundamental Investors Class A	12.13%	24.21%	22.73%	25.86%	-16.66%	22.43%	14.92%	27.07%	-8.13%	22.80%

Correlation

The correlation between RIRGX and ANCFX is 0.75, 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.	0.75
Correlation (3Y) Balances recent behavior with more history.	0.78
Correlation (5Y) Shows whether the relationship held over a longer period.	0.84
Correlation (10Y) Provides a long-term view across more market conditions.	0.85
Correlation (All Time) Calculated using the full available price history since Jan 4, 2010	0.87

The correlation between RIRGX and ANCFX shifts across timeframes, from 0.75 (1 year) to 0.87 (all time), reflecting how their relationship changes across market environments.

Return for Risk

RIRGX vs. ANCFX — Risk / Return Rank

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

RIRGX

RIRGX Risk / Return Rank: 85
RIRGX Sharpe Ratio Rank: 88
RIRGX Sortino Ratio Rank: 86
RIRGX Omega Ratio Rank: 84
RIRGX Calmar Ratio Rank: 81
RIRGX Martin Ratio Rank: 86

ANCFX

ANCFX Risk / Return Rank: 65
ANCFX Sharpe Ratio Rank: 63
ANCFX Sortino Ratio Rank: 60
ANCFX Omega Ratio Rank: 60
ANCFX Calmar Ratio Rank: 65
ANCFX Martin Ratio Rank: 77

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.

RIRGX vs. ANCFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Capital Income Builder Fund Class R6 (RIRGX) and American Funds Fundamental Investors Class A (ANCFX). 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.

	RIRGX	ANCFX	Difference
Sharpe ratio: Return per unit of total volatility	2.20	1.47	+0.74
Sortino ratio: Return per unit of downside risk	3.16	2.06	+1.10
Omega ratio: Gain probability vs. loss probability	1.41	1.26	+0.15
Calmar ratio: Return relative to maximum drawdown	2.79	2.09	+0.70
Martin ratio: Return relative to average drawdown	11.20	9.01	+2.19

RIRGX vs. ANCFX - Sharpe Ratio Comparison

The current RIRGX Sharpe Ratio is 2.20, which is higher than the ANCFX Sharpe Ratio of 1.47. The chart below compares the historical Sharpe Ratios of RIRGX and ANCFX, 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

RIRGX vs. ANCFX - Drawdown Comparison

The maximum RIRGX drawdown since its inception was -25.25%, smaller than the maximum ANCFX drawdown of -53.29%. Use the drawdown chart below to compare losses from any high point for RIRGX and ANCFX.

Drawdown Indicators

	RIRGX	ANCFX	Difference
Max Drawdown Largest peak-to-trough decline	-25.25%	-53.29%	+28.04%
Max Drawdown (1Y) Largest decline over 1 year	-6.47%	-10.66%	+4.19%
Max Drawdown (3Y) Largest decline over 3 years	-8.88%	-17.97%	+9.09%
Max Drawdown (5Y) Largest decline over 5 years	-17.45%	-25.07%	+7.62%
Max Drawdown (10Y) Largest decline over 10 years	-25.25%	-33.93%	+8.68%
Current Drawdown Current decline from peak	0.00%	-2.61%	+2.61%
Average Drawdown Average peak-to-trough decline	-3.03%	-7.30%	+4.27%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.61%	2.47%	-0.86%

Volatility

RIRGX vs. ANCFX - Volatility Comparison

The current volatility for American Funds Capital Income Builder Fund Class R6 (RIRGX) is 1.96%, while American Funds Fundamental Investors Class A (ANCFX) has a volatility of 4.22%. This indicates that RIRGX experiences smaller price fluctuations and is considered to be less risky than ANCFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	RIRGX	ANCFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.96%	4.22%	-2.26%
Volatility (6M) Calculated over the trailing 6-month period	6.56%	12.13%	-5.57%
Volatility (1Y) Calculated over the trailing 1-year period	8.21%	15.16%	-6.95%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.99%	17.01%	-7.02%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	10.78%	17.76%	-6.98%

RIRGX vs. ANCFX - Expense Ratio Comparison

RIRGX has a 0.26% expense ratio, which is lower than ANCFX's 0.57% expense ratio.

Dividends

RIRGX vs. ANCFX - Dividend Comparison

RIRGX's dividend yield for the trailing twelve months is around 7.41%, which matches ANCFX's 7.43% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ANCFX American Funds Fundamental Investors Class A	7.43%	8.54%	8.90%	5.80%	4.98%	10.97%	2.61%	6.91%	9.31%	7.28%	4.71%	6.08%
RIRGX American Funds Capital Income Builder Fund Class R6	7.41%	8.03%	5.35%	3.79%	3.77%	3.46%	3.49%	4.41%	4.12%	4.73%	2.88%	3.92%

Frequently Asked Questions

Can I hold both RIRGX and ANCFX in my portfolio?

RIRGX and ANCFX have a correlation of 0.75, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, RIRGX or ANCFX?

ANCFX has higher volatility (4.22%) compared to RIRGX (1.96%). In terms of maximum drawdown, RIRGX dropped -25.25% vs ANCFX's -53.29%.

Which has better risk-adjusted returns?

RIRGX currently has the higher Sharpe Ratio (2.20 vs 1.47), 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.