COPLX vs. ACIIX

Last updated Jul 17, 2026

COPLX (Copley Fund) and ACIIX (American Century Equity Income Fund Class I) are both Large Cap Value Equities funds. Over the past 10 years, COPLX returned 11.09%/yr vs 8.83%/yr for ACIIX. A 0.78 correlation means they provide meaningful diversification when combined. COPLX charges 2.37%/yr vs 0.72%/yr for ACIIX.

Performance

COPLX vs. ACIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Copley Fund (COPLX) and American Century Equity Income Fund Class I (ACIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

The year-to-date returns for both stocks are quite close, with COPLX having a 11.14% return and ACIIX slightly lower at 10.75%. Over the past 10 years, COPLX has outperformed ACIIX with an annualized return of 11.09%, while ACIIX has yielded a comparatively lower 8.83% annualized return.

COPLX

• 1D: 0.76%
• 1M: 3.09%
• 6M: 10.92%
• YTD: 11.14%
• 1Y: 19.71%
• 3Y*: 17.36%
• 5Y*: 10.70%
• 10Y*: 11.09%

ACIIX

• 1D: 0.22%
• 1M: 1.87%
• 6M: 7.70%
• YTD: 10.75%
• 1Y: 17.05%
• 3Y*: 11.77%
• 5Y*: 7.87%
• 10Y*: 8.83%

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

COPLX vs. ACIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
COPLX Copley Fund	11.14%	16.24%	18.18%	17.33%	-15.21%	18.39%	1.09%	25.59%	15.65%	9.49%
ACIIX American Century Equity Income Fund Class I	10.75%	12.05%	10.58%	4.25%	-2.96%	17.16%	1.19%	24.50%	-3.53%	13.69%

Correlation

The correlation between COPLX and ACIIX is 0.57, 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	0.57
Correlation (3Y) Calculated over the trailing 3-year period	0.65
Correlation (5Y) Calculated over the trailing 5-year period	0.75
Correlation (10Y) Calculated over the trailing 10-year period	0.73
Correlation (All Time) Calculated using the full available price history since Jul 8, 1998	0.78

Over the past year, the correlation between COPLX and ACIIX has dropped to 0.57 - well below their long-term average of 0.78, suggesting their price drivers have been diverging.

Return for Risk

COPLX vs. ACIIX — Risk / Return Rank

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

COPLX

COPLX Risk / Return Rank: 64
COPLX Sharpe Ratio Rank: 70
COPLX Sortino Ratio Rank: 68
COPLX Omega Ratio Rank: 65
COPLX Calmar Ratio Rank: 66
COPLX Martin Ratio Rank: 52

ACIIX

ACIIX Risk / Return Rank: 74
ACIIX Sharpe Ratio Rank: 81
ACIIX Sortino Ratio Rank: 83
ACIIX Omega Ratio Rank: 75
ACIIX Calmar Ratio Rank: 76
ACIIX 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.

COPLX vs. ACIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Copley Fund (COPLX) and American Century Equity Income Fund Class I (ACIIX). 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.

	COPLX	ACIIX	Difference
Sharpe ratio: Return per unit of total volatility	1.88	2.10	-0.22
Sortino ratio: Return per unit of downside risk	2.64	3.17	-0.53
Omega ratio: Gain probability vs. loss probability	1.33	1.37	-0.03
Calmar ratio: Return relative to maximum drawdown	2.53	2.79	-0.26
Martin ratio: Return relative to average drawdown	8.59	9.09	-0.50

COPLX vs. ACIIX - Sharpe Ratio Comparison

The current COPLX Sharpe Ratio is 1.88, which is comparable to the ACIIX Sharpe Ratio of 2.10. The chart below compares the historical Sharpe Ratios of COPLX and ACIIX, 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

COPLX vs. ACIIX - Drawdown Comparison

The maximum COPLX drawdown since its inception was -44.70%, which is greater than ACIIX's maximum drawdown of -39.16%. Use the drawdown chart below to compare losses from any high point for COPLX and ACIIX.

Drawdown Indicators

	COPLX	ACIIX	Difference
Max Drawdown Largest peak-to-trough decline	-44.70%	-39.16%	-5.54%
Max Drawdown (1Y) Largest decline over 1 year	-7.88%	-6.38%	-1.50%
Max Drawdown (3Y) Largest decline over 3 years	-18.21%	-10.15%	-8.06%
Max Drawdown (5Y) Largest decline over 5 years	-20.23%	-13.49%	-6.74%
Max Drawdown (10Y) Largest decline over 10 years	-36.61%	-32.76%	-3.85%
Current Drawdown Current decline from peak	0.00%	-0.43%	+0.43%
Average Drawdown Average peak-to-trough decline	-8.93%	-5.22%	-3.71%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.32%	1.95%	+0.37%

Volatility

COPLX vs. ACIIX - Volatility Comparison

Copley Fund (COPLX) and American Century Equity Income Fund Class I (ACIIX) have volatilities of 2.62% and 2.60%, 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

	COPLX	ACIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.62%	2.60%	+0.02%
Volatility (6M) Calculated over the trailing 6-month period	8.29%	6.35%	+1.94%
Volatility (1Y) Calculated over the trailing 1-year period	10.64%	8.55%	+2.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.05%	10.78%	+3.27%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	16.62%	13.33%	+3.29%

COPLX vs. ACIIX - Expense Ratio Comparison

COPLX has a 2.37% expense ratio, which is higher than ACIIX's 0.72% expense ratio.

Dividends

COPLX vs. ACIIX - Dividend Comparison

COPLX has not paid dividends to shareholders, while ACIIX's dividend yield for the trailing twelve months is around 9.70%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIIX American Century Equity Income Fund Class I	9.70%	10.55%	11.71%	8.21%	8.96%	7.02%	2.18%	7.57%	9.05%	12.14%	8.08%	10.72%
COPLX Copley Fund	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both COPLX and ACIIX in my portfolio?

COPLX and ACIIX have a correlation of 0.57, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, COPLX or ACIIX?

COPLX has higher volatility (2.62%) compared to ACIIX (2.60%). In terms of maximum drawdown, COPLX dropped -44.70% vs ACIIX's -39.16%.

Which has better risk-adjusted returns?

ACIIX currently has the higher Sharpe Ratio (2.10 vs 1.88), 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.