AMCPX vs. CAIBX

Last updated Jun 23, 2026

AMCPX (American Funds AMCAP Fund Class A) and CAIBX (American Funds Capital Income Builder Class A) are both mutual funds - AMCPX is a Large Cap Growth Equities fund actively managed by American Funds, while CAIBX is a Diversified Portfolio fund managed by American Funds. Over the past 10 years, AMCPX returned 12.36%/yr vs 7.88%/yr for CAIBX. A 0.75 correlation means they provide meaningful diversification when combined. AMCPX charges 0.64%/yr vs 0.59%/yr for CAIBX.

Performance

AMCPX vs. CAIBX - Performance Comparison

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

Returns By Period

In the year-to-date period, AMCPX achieves a 5.53% return, which is significantly lower than CAIBX's 7.43% return. Over the past 10 years, AMCPX has outperformed CAIBX with an annualized return of 12.36%, while CAIBX has yielded a comparatively lower 7.88% annualized return.

AMCPX

• 1D: 1.49%
• 1M: 1.54%
• YTD: 5.53%
• 6M: 5.33%
• 1Y: 20.65%
• 3Y*: 18.68%
• 5Y*: 9.06%
• 10Y*: 12.36%

CAIBX

• 1D: 0.00%
• 1M: 0.08%
• YTD: 7.43%
• 6M: 7.74%
• 1Y: 17.79%
• 3Y*: 14.33%
• 5Y*: 8.82%
• 10Y*: 7.88%

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

AMCPX vs. CAIBX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMCPX American Funds AMCAP Fund Class A	5.53%	17.68%	21.11%	31.04%	-28.67%	20.57%	21.42%	26.35%	-4.42%	22.08%
CAIBX American Funds Capital Income Builder Class A	7.43%	20.39%	10.24%	8.95%	-7.14%	14.99%	3.20%	17.23%	-7.28%	13.99%

Correlation

The correlation between AMCPX and CAIBX is 0.68, 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	0.68
Correlation (3Y) Calculated over the trailing 3-year period	0.73
Correlation (5Y) Calculated over the trailing 5-year period	0.76
Correlation (10Y) Calculated over the trailing 10-year period	0.78
Correlation (All Time) Calculated using the full available price history since Jul 30, 1987	0.75

The correlation between AMCPX and CAIBX has been stable across timeframes, ranging from 0.68 to 0.78 - a consistent structural relationship.

Return for Risk

AMCPX vs. CAIBX — Risk / Return Rank

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

AMCPX

AMCPX Risk / Return Rank: 23
AMCPX Sharpe Ratio Rank: 24
AMCPX Sortino Ratio Rank: 23
AMCPX Omega Ratio Rank: 25
AMCPX Calmar Ratio Rank: 18
AMCPX Martin Ratio Rank: 25

CAIBX

CAIBX Risk / Return Rank: 60
CAIBX Sharpe Ratio Rank: 63
CAIBX Sortino Ratio Rank: 64
CAIBX Omega Ratio Rank: 63
CAIBX Calmar Ratio Rank: 55
CAIBX Martin Ratio Rank: 57

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.

AMCPX vs. CAIBX - Risk-Adjusted Trends Comparison

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

	AMCPX	CAIBX	Difference
Sharpe ratio: Return per unit of total volatility	1.32	2.15	-0.83
Sortino ratio: Return per unit of downside risk	1.87	3.05	-1.17
Omega ratio: Gain probability vs. loss probability	1.24	1.40	-0.16
Calmar ratio: Return relative to maximum drawdown	1.43	2.73	-1.30
Martin ratio: Return relative to average drawdown	5.70	10.80	-5.10

AMCPX vs. CAIBX - Sharpe Ratio Comparison

The current AMCPX Sharpe Ratio is 1.32, which is lower than the CAIBX Sharpe Ratio of 2.15. The chart below compares the historical Sharpe Ratios of AMCPX and CAIBX, 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

AMCPX vs. CAIBX - Drawdown Comparison

The maximum AMCPX drawdown since its inception was -62.37%, which is greater than CAIBX's maximum drawdown of -43.68%. Use the drawdown chart below to compare losses from any high point for AMCPX and CAIBX.

Drawdown Indicators

	AMCPX	CAIBX	Difference
Max Drawdown Largest peak-to-trough decline	-62.37%	-43.68%	-18.69%
Max Drawdown (1Y) Largest decline over 1 year	-14.18%	-6.47%	-7.71%
Max Drawdown (3Y) Largest decline over 3 years	-19.71%	-8.89%	-10.82%
Max Drawdown (5Y) Largest decline over 5 years	-36.90%	-17.65%	-19.25%
Max Drawdown (10Y) Largest decline over 10 years	-36.90%	-25.28%	-11.62%
Current Drawdown Current decline from peak	-1.53%	-0.72%	-0.81%
Average Drawdown Average peak-to-trough decline	-9.57%	-3.80%	-5.77%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.55%	1.63%	+1.92%

Volatility

AMCPX vs. CAIBX - Volatility Comparison

American Funds AMCAP Fund Class A (AMCPX) has a higher volatility of 5.90% compared to American Funds Capital Income Builder Class A (CAIBX) at 2.56%. This indicates that AMCPX's price experiences larger fluctuations and is considered to be riskier than CAIBX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMCPX	CAIBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.90%	2.56%	+3.34%
Volatility (6M) Calculated over the trailing 6-month period	12.43%	6.63%	+5.80%
Volatility (1Y) Calculated over the trailing 1-year period	15.38%	8.23%	+7.15%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.37%	10.01%	+9.36%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.78%	10.89%	+7.89%

AMCPX vs. CAIBX - Expense Ratio Comparison

AMCPX has a 0.64% expense ratio, which is higher than CAIBX's 0.59% expense ratio.

Dividends

AMCPX vs. CAIBX - Dividend Comparison

AMCPX's dividend yield for the trailing twelve months is around 12.62%, more than CAIBX's 7.30% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMCPX American Funds AMCAP Fund Class A	12.62%	8.73%	8.19%	3.26%	7.54%	3.43%	3.88%	4.90%	7.84%	5.37%	3.81%	8.86%
CAIBX American Funds Capital Income Builder Class A	7.30%	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 AMCPX and CAIBX in my portfolio?

AMCPX and CAIBX have a correlation of 0.68, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AMCPX or CAIBX?

AMCPX has higher volatility (5.90%) compared to CAIBX (2.56%). In terms of maximum drawdown, AMCPX dropped -62.37% vs CAIBX's -43.68%.

Which has better risk-adjusted returns?

CAIBX currently has the higher Sharpe Ratio (2.15 vs 1.32), 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.