AMCFX vs. ONERX

Last updated Jun 5, 2026

AMCFX (American Funds AMCAP Fund Class F-2) and ONERX (One Rock Fund) are both Large Cap Growth Equities funds. Over the past 5 years, AMCFX returned 9.79%/yr vs 33.79%/yr for ONERX. Their correlation of 0.84 suggests significant overlap in exposure. AMCFX charges 0.43%/yr vs 1.75%/yr for ONERX.

Performance

AMCFX vs. ONERX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Funds AMCAP Fund Class F-2 (AMCFX) and One Rock Fund (ONERX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, AMCFX achieves a 5.52% return, which is significantly lower than ONERX's 63.96% return.

AMCFX

• 1D: -0.84%
• 1M: 2.34%
• YTD: 5.52%
• 6M: 5.22%
• 1Y: 20.54%
• 3Y*: 19.74%
• 5Y*: 9.79%
• 10Y*: 12.79%

ONERX

• 1D: -1.71%
• 1M: 16.42%
• YTD: 63.96%
• 6M: 60.96%
• 1Y: 125.75%
• 3Y*: 56.19%
• 5Y*: 33.79%
• 10Y*: —

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

AMCFX vs. ONERX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020
AMCFX American Funds AMCAP Fund Class F-2	5.52%	17.94%	21.38%	31.35%	-28.53%	23.97%	42.63%
ONERX One Rock Fund	63.96%	49.37%	21.76%	72.41%	-42.06%	45.70%	104.46%

Correlation

The correlation between AMCFX and ONERX is 0.71, 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	0.71
Correlation (3Y) Calculated over the trailing 3-year period	0.81
Correlation (5Y) Calculated over the trailing 5-year period	0.85
Correlation (All Time) Calculated using the full available price history since Mar 16, 2020	0.84

The correlation between AMCFX and ONERX shifts across timeframes, from 0.71 (1 year) to 0.85 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

AMCFX vs. ONERX — Risk / Return Rank

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

AMCFX

AMCFX Risk / Return Rank: 24
AMCFX Sharpe Ratio Rank: 27
AMCFX Sortino Ratio Rank: 25
AMCFX Omega Ratio Rank: 27
AMCFX Calmar Ratio Rank: 18
AMCFX Martin Ratio Rank: 26

ONERX

ONERX Risk / Return Rank: 85
ONERX Sharpe Ratio Rank: 95
ONERX Sortino Ratio Rank: 67
ONERX Omega Ratio Rank: 72
ONERX Calmar Ratio Rank: 97
ONERX Martin Ratio Rank: 97

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.

AMCFX vs. ONERX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Funds AMCAP Fund Class F-2 (AMCFX) and One Rock Fund (ONERX). 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.

	AMCFX	ONERX	Difference
Sharpe ratio: Return per unit of total volatility	1.46	3.34	-1.88
Sortino ratio: Return per unit of downside risk	2.05	3.40	-1.35
Omega ratio: Gain probability vs. loss probability	1.27	1.48	-0.21
Calmar ratio: Return relative to maximum drawdown	1.50	7.17	-5.68
Martin ratio: Return relative to average drawdown	6.08	25.36	-19.28
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

AMCFX vs. ONERX - Sharpe Ratio Comparison

The current AMCFX Sharpe Ratio is 1.46, which is lower than the ONERX Sharpe Ratio of 3.34. The chart below compares the historical Sharpe Ratios of AMCFX and ONERX, 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

	AMCFX	ONERX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.46	3.34	-1.88
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.51	0.87	-0.36
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.69	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.62	1.10	-0.49

Drawdowns

AMCFX vs. ONERX - Drawdown Comparison

The maximum AMCFX drawdown since its inception was -43.83%, smaller than the maximum ONERX drawdown of -47.44%. Use the drawdown chart below to compare losses from any high point for AMCFX and ONERX.

Drawdown Indicators

	AMCFX	ONERX	Difference
Max Drawdown Largest peak-to-trough decline	-43.83%	-47.44%	+3.61%
Max Drawdown (1Y) Largest decline over 1 year	-14.14%	-17.63%	+3.49%
Max Drawdown (3Y) Largest decline over 3 years	-19.69%	-47.44%	+27.75%
Max Drawdown (5Y) Largest decline over 5 years	-35.12%	-47.44%	+12.32%
Max Drawdown (10Y) Largest decline over 10 years	-35.12%	—	—
Current Drawdown Current decline from peak	-1.59%	-1.71%	+0.12%
Average Drawdown Average peak-to-trough decline	-6.57%	-13.79%	+7.22%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.47%	4.98%	-1.51%

Volatility

AMCFX vs. ONERX - Volatility Comparison

The current volatility for American Funds AMCAP Fund Class F-2 (AMCFX) is 3.68%, while One Rock Fund (ONERX) has a volatility of 12.25%. This indicates that AMCFX experiences smaller price fluctuations and is considered to be less risky than ONERX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	AMCFX	ONERX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.68%	12.25%	-8.57%
Volatility (6M) Calculated over the trailing 6-month period	11.39%	29.80%	-18.41%
Volatility (1Y) Calculated over the trailing 1-year period	14.56%	37.94%	-23.38%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.25%	39.12%	-19.87%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.72%	38.20%	-19.48%

AMCFX vs. ONERX - Expense Ratio Comparison

AMCFX has a 0.43% expense ratio, which is lower than ONERX's 1.75% expense ratio.

Dividends

AMCFX vs. ONERX - Dividend Comparison

AMCFX's dividend yield for the trailing twelve months is around 8.12%, less than ONERX's 14.71% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
AMCFX American Funds AMCAP Fund Class F-2	8.12%	8.57%	8.25%	3.59%	7.43%	5.87%	4.02%	5.04%	7.99%	5.50%	4.02%	8.82%
ONERX One Rock Fund	14.71%	24.12%	0.00%	0.00%	10.57%	28.88%	18.66%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both AMCFX and ONERX in my portfolio?

AMCFX and ONERX have a correlation of 0.71, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, AMCFX or ONERX?

ONERX has higher volatility (12.25%) compared to AMCFX (3.68%). In terms of maximum drawdown, AMCFX dropped -43.83% vs ONERX's -47.44%.

Which has better risk-adjusted returns?

ONERX currently has the higher Sharpe Ratio (3.34 vs 1.46), 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.