CAIBX vs. ANCFX

Last updated Jun 4, 2026

CAIBX (American Funds Capital Income Builder Class A) and ANCFX (American Funds Fundamental Investors Class A) are both mutual funds - CAIBX is a Diversified Portfolio fund managed by American Funds, while ANCFX is a Large Cap Blend Equities fund managed by American Funds. Over the past 10 years, CAIBX returned 7.94%/yr vs 14.90%/yr for ANCFX. Their correlation of 0.83 suggests significant overlap in exposure. Both charge a 0.59% expense ratio.

Performance

CAIBX vs. ANCFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds Capital Income Builder Class A (CAIBX) 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, CAIBX achieves a 7.79% return, which is significantly lower than ANCFX's 15.14% return. Over the past 10 years, CAIBX has underperformed ANCFX with an annualized return of 7.94%, while ANCFX has yielded a comparatively higher 14.90% annualized return.

CAIBX

• 1D: 0.57%
• 1M: 2.03%
• YTD: 7.79%
• 6M: 8.56%
• 1Y: 18.52%
• 3Y*: 15.22%
• 5Y*: 8.54%
• 10Y*: 7.94%

ANCFX

• 1D: 0.00%
• 1M: 5.89%
• YTD: 15.14%
• 6M: 16.14%
• 1Y: 34.54%
• 3Y*: 26.09%
• 5Y*: 14.91%
• 10Y*: 14.90%

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

CAIBX vs. ANCFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
CAIBX American Funds Capital Income Builder Class A	7.79%	20.39%	10.24%	8.95%	-7.14%	14.99%	3.20%	17.23%	-7.28%	13.99%
ANCFX American Funds Fundamental Investors Class A	15.14%	24.21%	22.73%	25.86%	-16.66%	22.43%	14.92%	27.07%	-8.13%	22.80%

Correlation

The correlation between CAIBX and ANCFX is 0.77, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.77
Correlation (3Y) Calculated over the trailing 3-year period	0.80
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (10Y) Calculated over the trailing 10-year period	0.86
Correlation (All Time) Calculated using the full available price history since Jul 31, 1987	0.83

The correlation between CAIBX and ANCFX has been stable across timeframes, ranging from 0.77 to 0.86 - a consistent structural relationship.

Return for Risk

CAIBX vs. ANCFX — Risk / Return Rank

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

CAIBX

CAIBX Risk / Return Rank: 60
CAIBX Sharpe Ratio Rank: 64
CAIBX Sortino Ratio Rank: 62
CAIBX Omega Ratio Rank: 62
CAIBX Calmar Ratio Rank: 57
CAIBX Martin Ratio Rank: 57

ANCFX

ANCFX Risk / Return Rank: 75
ANCFX Sharpe Ratio Rank: 79
ANCFX Sortino Ratio Rank: 69
ANCFX Omega Ratio Rank: 69
ANCFX Calmar Ratio Rank: 73
ANCFX Martin Ratio Rank: 82

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.

CAIBX vs. ANCFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Capital Income Builder Class A (CAIBX) 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.

	CAIBX	ANCFX	Difference
Sharpe ratio: Return per unit of total volatility	2.34	2.58	-0.24
Sortino ratio: Return per unit of downside risk	3.31	3.47	-0.16
Omega ratio: Gain probability vs. loss probability	1.44	1.47	-0.03
Calmar ratio: Return relative to maximum drawdown	2.89	3.33	-0.44
Martin ratio: Return relative to average drawdown	11.49	15.41	-3.92
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

CAIBX vs. ANCFX - Sharpe Ratio Comparison

The current CAIBX Sharpe Ratio is 2.34, which is comparable to the ANCFX Sharpe Ratio of 2.58. The chart below compares the historical Sharpe Ratios of CAIBX 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.

Sharpe Ratios by Period

	CAIBX	ANCFX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.34	2.58	-0.24
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.86	0.89	-0.03
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.73	0.84	-0.11
Sharpe Ratio (All Time) Calculated using the full available price history	0.92	0.64	+0.29

Drawdowns

CAIBX vs. ANCFX - Drawdown Comparison

The maximum CAIBX drawdown since its inception was -43.68%, smaller than the maximum ANCFX drawdown of -53.29%. Use the drawdown chart below to compare losses from any high point for CAIBX and ANCFX.

Drawdown Indicators

	CAIBX	ANCFX	Difference
Max Drawdown Largest peak-to-trough decline	-43.68%	-53.29%	+9.61%
Max Drawdown (1Y) Largest decline over 1 year	-6.47%	-10.66%	+4.19%
Max Drawdown (3Y) Largest decline over 3 years	-8.89%	-17.97%	+9.08%
Max Drawdown (5Y) Largest decline over 5 years	-17.65%	-25.07%	+7.42%
Max Drawdown (10Y) Largest decline over 10 years	-25.28%	-33.93%	+8.65%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-3.81%	-7.32%	+3.51%
Ulcer Index Depth and duration of drawdowns from previous peaks	1.63%	2.30%	-0.67%

Volatility

CAIBX vs. ANCFX - Volatility Comparison

The current volatility for American Funds Capital Income Builder Class A (CAIBX) is 2.47%, while American Funds Fundamental Investors Class A (ANCFX) has a volatility of 3.68%. This indicates that CAIBX 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

	CAIBX	ANCFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.47%	3.68%	-1.21%
Volatility (6M) Calculated over the trailing 6-month period	6.42%	10.82%	-4.40%
Volatility (1Y) Calculated over the trailing 1-year period	8.00%	13.75%	-5.75%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	9.98%	16.80%	-6.82%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	10.88%	17.73%	-6.85%

CAIBX vs. ANCFX - Expense Ratio Comparison

Both CAIBX and ANCFX have an expense ratio of 0.59%.

Dividends

CAIBX vs. ANCFX - Dividend Comparison

CAIBX's dividend yield for the trailing twelve months is around 7.22%, less than 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%
CAIBX American Funds Capital Income Builder Class A	7.22%	7.71%	5.76%	3.47%	3.43%	3.14%	3.38%	4.10%	3.55%	4.44%	3.52%	3.62%

Frequently Asked Questions

Can I hold both CAIBX and ANCFX in my portfolio?

CAIBX and ANCFX have a correlation of 0.77, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, CAIBX or ANCFX?

ANCFX has higher volatility (3.68%) compared to CAIBX (2.47%). In terms of maximum drawdown, CAIBX dropped -43.68% vs ANCFX's -53.29%.

Which has better risk-adjusted returns?

ANCFX currently has the higher Sharpe Ratio (2.58 vs 2.34), 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.