AMCPX vs. FSPGX

Last updated Apr 1, 2026

Compare and contrast key facts about American Funds AMCAP Fund Class A (AMCPX) and Fidelity Large Cap Growth Index Fund (FSPGX).

AMCPX is managed by American Funds. It was launched on Jan 5, 1967. FSPGX is managed by Fidelity.

Performance

AMCPX vs. FSPGX - Performance Comparison

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

AMCPX vs. FSPGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
AMCPX American Funds AMCAP Fund Class A	-11.82%	17.68%	21.11%	31.04%	-28.67%	20.57%	21.42%	26.35%	-4.42%	21.01%
FSPGX Fidelity Large Cap Growth Index Fund	-13.03%	18.54%	33.27%	42.77%	-29.17%	27.57%	38.46%	36.38%	-1.79%	27.70%

Returns By Period

In the year-to-date period, AMCPX achieves a -11.82% return, which is significantly higher than FSPGX's -13.03% return.

AMCPX

• 1D: -0.37%
• 1M: -10.12%
• YTD: -11.82%
• 6M: -9.34%
• 1Y: 11.06%
• 3Y*: 14.39%
• 5Y*: 6.22%
• 10Y*: 10.59%

FSPGX

• 1D: -0.45%
• 1M: -8.63%
• YTD: -13.03%
• 6M: -12.06%
• 1Y: 14.49%
• 3Y*: 19.68%
• 5Y*: 11.91%
• 10Y*: —

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

AMCPX vs. FSPGX - Expense Ratio Comparison

AMCPX has a 0.65% expense ratio, which is higher than FSPGX's 0.04% expense ratio.

AMCPX

American Funds AMCAP Fund Class A

FSPGX

Fidelity Large Cap Growth Index Fund

Return for Risk

AMCPX vs. FSPGX — 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: 23
AMCPX Sortino Ratio Rank: 25
AMCPX Omega Ratio Rank: 25
AMCPX Calmar Ratio Rank: 20
AMCPX Martin Ratio Rank: 23

FSPGX

FSPGX Risk / Return Rank: 28
FSPGX Sharpe Ratio Rank: 29
FSPGX Sortino Ratio Rank: 33
FSPGX Omega Ratio Rank: 32
FSPGX Calmar Ratio Rank: 25
FSPGX Martin Ratio Rank: 23

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. FSPGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds AMCAP Fund Class A (AMCPX) and Fidelity Large Cap Growth Index Fund (FSPGX). 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.

	AMCPX	FSPGX	Difference
Sharpe ratio Return per unit of total volatility	0.56	0.66	-0.10
Sortino ratio Return per unit of downside risk	0.94	1.10	-0.16
Omega ratio Gain probability vs. loss probability	1.13	1.15	-0.02
Calmar ratio Return relative to maximum drawdown	0.59	0.72	-0.13
Martin ratio Return relative to average drawdown	2.42	2.51	-0.10
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AMCPX vs. FSPGX - Sharpe Ratio Comparison

The current AMCPX Sharpe Ratio is 0.56, which is comparable to the FSPGX Sharpe Ratio of 0.66. The chart below compares the historical Sharpe Ratios of AMCPX and FSPGX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	AMCPX	FSPGX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.56	0.66	-0.10
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.33	0.56	-0.23
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.57	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.57	0.78	-0.21

Correlation

The correlation between AMCPX and FSPGX is 0.94, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

AMCPX vs. FSPGX - Dividend Comparison

AMCPX's dividend yield for the trailing twelve months is around 9.90%, more than FSPGX's 0.40% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMCPX American Funds AMCAP Fund Class A	9.90%	8.73%	8.19%	3.26%	7.54%	3.43%	3.88%	4.90%	7.84%	5.37%	3.81%	8.86%
FSPGX Fidelity Large Cap Growth Index Fund	0.40%	0.34%	0.37%	0.73%	0.86%	2.22%	1.76%	1.04%	1.32%	0.22%	0.00%	0.00%

Drawdowns

AMCPX vs. FSPGX - Drawdown Comparison

The maximum AMCPX drawdown since its inception was -62.37%, which is greater than FSPGX's maximum drawdown of -32.66%. Use the drawdown chart below to compare losses from any high point for AMCPX and FSPGX.

Drawdown Indicators

	AMCPX	FSPGX	Difference
Max Drawdown Largest peak-to-trough decline	-62.37%	-32.66%	-29.71%
Max Drawdown (1Y) Largest decline over 1 year	-14.18%	-16.17%	+1.99%
Max Drawdown (5Y) Largest decline over 5 years	-36.90%	-32.66%	-4.24%
Max Drawdown (10Y) Largest decline over 10 years	-36.90%	—	—
Current Drawdown Current decline from peak	-14.18%	-16.17%	+1.99%
Average Drawdown Average peak-to-trough decline	-9.60%	-6.43%	-3.17%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.47%	4.63%	-1.16%

Volatility

AMCPX vs. FSPGX - Volatility Comparison

American Funds AMCAP Fund Class A (AMCPX) and Fidelity Large Cap Growth Index Fund (FSPGX) have volatilities of 5.26% and 5.33%, 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

	AMCPX	FSPGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.26%	5.33%	-0.07%
Volatility (6M) Calculated over the trailing 6-month period	11.06%	11.79%	-0.73%
Volatility (1Y) Calculated over the trailing 1-year period	19.60%	22.32%	-2.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.12%	21.46%	-2.34%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.63%	21.63%	-3.00%