AMPCX vs. AGTHX

Last updated Jun 5, 2026

AMPCX (American Funds AMCAP Fund Class C) and AGTHX (American Funds The Growth Fund of America Class A) are both Large Cap Growth Equities funds. Over the past 10 years, AMPCX returned 11.66%/yr vs 15.88%/yr for AGTHX. With a 0.97 correlation, they move nearly in lockstep. AMPCX charges 1.40%/yr vs 0.59%/yr for AGTHX.

Performance

AMPCX vs. AGTHX - Performance Comparison

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

Returns By Period

In the year-to-date period, AMPCX achieves a 5.11% return, which is significantly lower than AGTHX's 9.21% return. Over the past 10 years, AMPCX has underperformed AGTHX with an annualized return of 11.66%, while AGTHX has yielded a comparatively higher 15.88% annualized return.

AMPCX

• 1D: -0.85%
• 1M: 2.25%
• YTD: 5.11%
• 6M: 4.68%
• 1Y: 19.37%
• 3Y*: 18.57%
• 5Y*: 8.74%
• 10Y*: 11.66%

AGTHX

• 1D: -0.80%
• 1M: 5.21%
• YTD: 9.21%
• 6M: 8.74%
• 1Y: 24.73%
• 3Y*: 24.82%
• 5Y*: 12.08%
• 10Y*: 15.88%

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

AMPCX vs. AGTHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMPCX American Funds AMCAP Fund Class C	5.11%	16.78%	20.17%	30.08%	-29.17%	22.77%	20.52%	25.37%	-5.50%	21.11%
AGTHX American Funds The Growth Fund of America Class A	9.21%	19.73%	28.02%	37.22%	-30.75%	19.32%	37.83%	28.16%	-3.15%	26.14%

Correlation

The correlation between AMPCX and AGTHX 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	0.97
Correlation (All Time) Calculated using the full available price history since Mar 16, 2001	0.97

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

Return for Risk

AMPCX vs. AGTHX — Risk / Return Rank

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

AMPCX

AMPCX Risk / Return Rank: 21
AMPCX Sharpe Ratio Rank: 22
AMPCX Sortino Ratio Rank: 21
AMPCX Omega Ratio Rank: 23
AMPCX Calmar Ratio Rank: 16
AMPCX Martin Ratio Rank: 22

AGTHX

AGTHX Risk / Return Rank: 30
AGTHX Sharpe Ratio Rank: 33
AGTHX Sortino Ratio Rank: 30
AGTHX Omega Ratio Rank: 32
AGTHX Calmar Ratio Rank: 25
AGTHX Martin Ratio Rank: 32

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.

AMPCX vs. AGTHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds AMCAP Fund Class C (AMPCX) and American Funds The Growth Fund of America Class A (AGTHX). 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.

	AMPCX	AGTHX	Difference
Sharpe ratio: Return per unit of total volatility	1.37	1.67	-0.30
Sortino ratio: Return per unit of downside risk	1.94	2.30	-0.36
Omega ratio: Gain probability vs. loss probability	1.25	1.30	-0.05
Calmar ratio: Return relative to maximum drawdown	1.39	1.84	-0.44
Martin ratio: Return relative to average drawdown	5.63	7.17	-1.54
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AMPCX vs. AGTHX - Sharpe Ratio Comparison

The current AMPCX Sharpe Ratio is 1.37, which is comparable to the AGTHX Sharpe Ratio of 1.67. The chart below compares the historical Sharpe Ratios of AMPCX and AGTHX, 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

	AMPCX	AGTHX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.37	1.67	-0.30
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.46	0.60	-0.14
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.62	0.81	-0.18
Sharpe Ratio (All Time) Calculated using the full available price history	0.44	0.71	-0.27

Drawdowns

AMPCX vs. AGTHX - Drawdown Comparison

The maximum AMPCX drawdown since its inception was -53.38%, roughly equal to the maximum AGTHX drawdown of -51.91%. Use the drawdown chart below to compare losses from any high point for AMPCX and AGTHX.

Drawdown Indicators

	AMPCX	AGTHX	Difference
Max Drawdown Largest peak-to-trough decline	-53.38%	-51.91%	-1.47%
Max Drawdown (1Y) Largest decline over 1 year	-14.33%	-13.76%	-0.57%
Max Drawdown (3Y) Largest decline over 3 years	-19.81%	-21.57%	+1.76%
Max Drawdown (5Y) Largest decline over 5 years	-35.67%	-36.38%	+0.71%
Max Drawdown (10Y) Largest decline over 10 years	-35.67%	-36.38%	+0.71%
Current Drawdown Current decline from peak	-1.61%	-1.13%	-0.48%
Average Drawdown Average peak-to-trough decline	-9.22%	-9.20%	-0.02%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.54%	3.52%	+0.02%

Volatility

AMPCX vs. AGTHX - Volatility Comparison

American Funds AMCAP Fund Class C (AMPCX) and American Funds The Growth Fund of America Class A (AGTHX) have volatilities of 3.71% and 3.84%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMPCX	AGTHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.71%	3.84%	-0.13%
Volatility (6M) Calculated over the trailing 6-month period	11.41%	11.66%	-0.25%
Volatility (1Y) Calculated over the trailing 1-year period	14.58%	15.16%	-0.58%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.26%	20.25%	-0.99%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.73%	19.69%	-0.96%

AMPCX vs. AGTHX - Expense Ratio Comparison

AMPCX has a 1.40% expense ratio, which is higher than AGTHX's 0.59% expense ratio.

Dividends

AMPCX vs. AGTHX - Dividend Comparison

AMPCX's dividend yield for the trailing twelve months is around 10.80%, more than AGTHX's 9.79% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AGTHX American Funds The Growth Fund of America Class A	9.79%	10.69%	8.99%	7.40%	4.05%	8.18%	4.30%	7.15%	11.99%	7.03%	6.61%	8.87%
AMPCX American Funds AMCAP Fund Class C	10.80%	11.35%	9.83%	3.32%	9.21%	7.09%	4.32%	5.06%	8.25%	5.61%	3.77%	9.83%

Frequently Asked Questions

Can I hold both AMPCX and AGTHX in my portfolio?

With a correlation of 0.97, AMPCX and AGTHX 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, AMPCX or AGTHX?

AGTHX has higher volatility (3.84%) compared to AMPCX (3.71%). In terms of maximum drawdown, AMPCX dropped -53.38% vs AGTHX's -51.91%.

Which has better risk-adjusted returns?

AGTHX currently has the higher Sharpe Ratio (1.67 vs 1.37), 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.