GWPAX vs. AMCPX

Last updated Jun 4, 2026

GWPAX (American Funds Growth Portfolio Class A) and AMCPX (American Funds AMCAP Fund Class A) are both mutual funds - GWPAX is a Diversified Portfolio fund managed by American Funds, while AMCPX is a Large Cap Growth Equities fund managed by American Funds. Over the past 10 years, GWPAX returned 13.36%/yr vs 12.36%/yr for AMCPX. With a 0.97 correlation, they move nearly in lockstep. GWPAX charges 0.73%/yr vs 0.65%/yr for AMCPX.

Performance

GWPAX vs. AMCPX - Performance Comparison

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

Returns By Period

In the year-to-date period, GWPAX achieves a 11.30% return, which is significantly higher than AMCPX's 6.34% return. Over the past 10 years, GWPAX has outperformed AMCPX with an annualized return of 13.36%, while AMCPX has yielded a comparatively lower 12.36% annualized return.

GWPAX

• 1D: 0.00%
• 1M: 5.60%
• YTD: 11.30%
• 6M: 11.76%
• 1Y: 28.12%
• 3Y*: 22.16%
• 5Y*: 10.65%
• 10Y*: 13.36%

AMCPX

• 1D: -0.77%
• 1M: 3.82%
• YTD: 6.34%
• 6M: 6.01%
• 1Y: 21.86%
• 3Y*: 19.82%
• 5Y*: 9.39%
• 10Y*: 12.36%

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

GWPAX vs. AMCPX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
GWPAX American Funds Growth Portfolio Class A	11.30%	20.47%	20.17%	28.76%	-26.97%	18.59%	25.34%	27.19%	-6.59%	25.12%
AMCPX American Funds AMCAP Fund Class A	6.34%	17.68%	21.11%	31.04%	-28.67%	20.57%	21.42%	26.35%	-4.42%	22.08%

Correlation

The correlation between GWPAX and AMCPX is 0.97 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.97
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.98
Correlation (10Y) Calculated over the trailing 10-year period	0.98
Correlation (All Time) Calculated using the full available price history since Jan 3, 2013	0.98

The correlation between GWPAX and AMCPX has been stable across timeframes, ranging from 0.97 to 0.98 - a consistent structural relationship.

Return for Risk

GWPAX vs. AMCPX — Risk / Return Rank

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

GWPAX

GWPAX Risk / Return Rank: 46
GWPAX Sharpe Ratio Rank: 47
GWPAX Sortino Ratio Rank: 44
GWPAX Omega Ratio Rank: 46
GWPAX Calmar Ratio Rank: 42
GWPAX Martin Ratio Rank: 53

AMCPX

AMCPX Risk / Return Rank: 27
AMCPX Sharpe Ratio Rank: 30
AMCPX Sortino Ratio Rank: 28
AMCPX Omega Ratio Rank: 30
AMCPX Calmar Ratio Rank: 19
AMCPX Martin Ratio Rank: 27

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.

GWPAX vs. AMCPX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds Growth Portfolio Class A (GWPAX) and American Funds AMCAP Fund Class A (AMCPX). 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.

	GWPAX	AMCPX	Difference
Sharpe ratio: Return per unit of total volatility	2.03	1.56	+0.46
Sortino ratio: Return per unit of downside risk	2.79	2.19	+0.61
Omega ratio: Gain probability vs. loss probability	1.37	1.28	+0.08
Calmar ratio: Return relative to maximum drawdown	2.45	1.60	+0.84
Martin ratio: Return relative to average drawdown	10.81	6.51	+4.30
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

GWPAX vs. AMCPX - Sharpe Ratio Comparison

The current GWPAX Sharpe Ratio is 2.03, which is comparable to the AMCPX Sharpe Ratio of 1.56. The chart below compares the historical Sharpe Ratios of GWPAX and AMCPX, 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

	GWPAX	AMCPX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.03	1.56	+0.46
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.59	0.49	+0.10
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.74	0.66	+0.08
Sharpe Ratio (All Time) Calculated using the full available price history	0.75	0.59	+0.16

Drawdowns

GWPAX vs. AMCPX - Drawdown Comparison

The maximum GWPAX drawdown since its inception was -34.15%, smaller than the maximum AMCPX drawdown of -62.37%. Use the drawdown chart below to compare losses from any high point for GWPAX and AMCPX.

Drawdown Indicators

	GWPAX	AMCPX	Difference
Max Drawdown Largest peak-to-trough decline	-34.15%	-62.37%	+28.22%
Max Drawdown (1Y) Largest decline over 1 year	-11.78%	-14.18%	+2.40%
Max Drawdown (3Y) Largest decline over 3 years	-19.42%	-19.71%	+0.29%
Max Drawdown (5Y) Largest decline over 5 years	-34.15%	-36.90%	+2.75%
Max Drawdown (10Y) Largest decline over 10 years	-34.15%	-36.90%	+2.75%
Current Drawdown Current decline from peak	0.00%	-0.77%	+0.77%
Average Drawdown Average peak-to-trough decline	-5.72%	-9.58%	+3.86%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.66%	3.49%	-0.83%

Volatility

GWPAX vs. AMCPX - Volatility Comparison

American Funds Growth Portfolio Class A (GWPAX) has a higher volatility of 3.81% compared to American Funds AMCAP Fund Class A (AMCPX) at 3.57%. This indicates that GWPAX's price experiences larger fluctuations and is considered to be riskier than AMCPX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	GWPAX	AMCPX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.81%	3.57%	+0.24%
Volatility (6M) Calculated over the trailing 6-month period	11.24%	11.42%	-0.18%
Volatility (1Y) Calculated over the trailing 1-year period	14.25%	14.56%	-0.31%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.24%	19.24%	-1.00%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.02%	18.72%	-0.70%

GWPAX vs. AMCPX - Expense Ratio Comparison

GWPAX has a 0.73% expense ratio, which is higher than AMCPX's 0.65% expense ratio.

Dividends

GWPAX vs. AMCPX - Dividend Comparison

GWPAX's dividend yield for the trailing twelve months is around 5.17%, less than AMCPX's 8.21% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMCPX American Funds AMCAP Fund Class A	8.21%	8.73%	8.19%	3.26%	7.54%	3.43%	3.88%	4.90%	7.84%	5.37%	3.81%	8.86%
GWPAX American Funds Growth Portfolio Class A	5.17%	5.75%	5.83%	1.61%	9.94%	3.42%	3.42%	5.77%	6.19%	3.39%	4.36%	4.84%

Frequently Asked Questions

Can I hold both GWPAX and AMCPX in my portfolio?

With a correlation of 0.97, GWPAX and AMCPX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, GWPAX or AMCPX?

GWPAX has higher volatility (3.81%) compared to AMCPX (3.57%). In terms of maximum drawdown, GWPAX dropped -34.15% vs AMCPX's -62.37%.

Which has better risk-adjusted returns?

GWPAX currently has the higher Sharpe Ratio (2.02 vs 1.56), 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.