ACFOX vs. PRGFX

Last updated Jun 23, 2026

ACFOX (American Century Investments Focused Dynamic Growth Fund) and PRGFX (T. Rowe Price Growth Stock Fund) are both Large Cap Growth Equities funds. Over the past 10 years, ACFOX returned 19.22%/yr vs 15.92%/yr for PRGFX. Their correlation of 0.91 suggests significant overlap in exposure. ACFOX charges 0.85%/yr vs 0.63%/yr for PRGFX.

Performance

ACFOX vs. PRGFX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Investments Focused Dynamic Growth Fund (ACFOX) and T. Rowe Price Growth Stock Fund (PRGFX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACFOX achieves a 5.91% return, which is significantly higher than PRGFX's 3.52% return. Over the past 10 years, ACFOX has outperformed PRGFX with an annualized return of 19.22%, while PRGFX has yielded a comparatively lower 15.92% annualized return.

ACFOX

• 1D: 1.86%
• 1M: -2.05%
• YTD: 5.91%
• 6M: 4.50%
• 1Y: 29.60%
• 3Y*: 25.36%
• 5Y*: 9.68%
• 10Y*: 19.22%

PRGFX

• 1D: 1.71%
• 1M: -0.72%
• YTD: 3.52%
• 6M: 2.95%
• 1Y: 19.83%
• 3Y*: 22.66%
• 5Y*: 8.90%
• 10Y*: 15.92%

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

ACFOX vs. PRGFX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACFOX American Century Investments Focused Dynamic Growth Fund	5.91%	20.51%	43.30%	35.66%	-36.32%	7.08%	73.31%	32.30%	6.51%	34.55%
PRGFX T. Rowe Price Growth Stock Fund	3.52%	15.64%	38.36%	45.33%	-40.12%	19.86%	36.92%	30.83%	-1.04%	33.57%

Correlation

The correlation between ACFOX and PRGFX is 0.92, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.92
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (5Y) Calculated over the trailing 5-year period	0.93
Correlation (10Y) Calculated over the trailing 10-year period	0.92
Correlation (All Time) Calculated using the full available price history since May 31, 2006	0.91

The correlation between ACFOX and PRGFX has been stable across timeframes, ranging from 0.91 to 0.93 - a consistent structural relationship.

Return for Risk

ACFOX vs. PRGFX — Risk / Return Rank

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

ACFOX

ACFOX Risk / Return Rank: 27
ACFOX Sharpe Ratio Rank: 30
ACFOX Sortino Ratio Rank: 26
ACFOX Omega Ratio Rank: 27
ACFOX Calmar Ratio Rank: 25
ACFOX Martin Ratio Rank: 27

PRGFX

PRGFX Risk / Return Rank: 16
PRGFX Sharpe Ratio Rank: 19
PRGFX Sortino Ratio Rank: 17
PRGFX Omega Ratio Rank: 17
PRGFX Calmar Ratio Rank: 12
PRGFX Martin Ratio Rank: 12

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.

ACFOX vs. PRGFX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Investments Focused Dynamic Growth Fund (ACFOX) and T. Rowe Price Growth Stock Fund (PRGFX). 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.

	ACFOX	PRGFX	Difference
Sharpe ratio: Return per unit of total volatility	1.45	1.15	+0.30
Sortino ratio: Return per unit of downside risk	1.98	1.63	+0.36
Omega ratio: Gain probability vs. loss probability	1.25	1.21	+0.05
Calmar ratio: Return relative to maximum drawdown	1.76	1.07	+0.69
Martin ratio: Return relative to average drawdown	6.02	3.36	+2.67

ACFOX vs. PRGFX - Sharpe Ratio Comparison

The current ACFOX Sharpe Ratio is 1.45, which is comparable to the PRGFX Sharpe Ratio of 1.15. The chart below compares the historical Sharpe Ratios of ACFOX and PRGFX, 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

ACFOX vs. PRGFX - Drawdown Comparison

The maximum ACFOX drawdown since its inception was -58.92%, which is greater than PRGFX's maximum drawdown of -54.01%. Use the drawdown chart below to compare losses from any high point for ACFOX and PRGFX.

Drawdown Indicators

	ACFOX	PRGFX	Difference
Max Drawdown Largest peak-to-trough decline	-58.92%	-54.01%	-4.91%
Max Drawdown (1Y) Largest decline over 1 year	-16.52%	-18.02%	+1.50%
Max Drawdown (3Y) Largest decline over 3 years	-27.03%	-22.69%	-4.34%
Max Drawdown (5Y) Largest decline over 5 years	-43.77%	-46.44%	+2.67%
Max Drawdown (10Y) Largest decline over 10 years	-43.77%	-46.44%	+2.67%
Current Drawdown Current decline from peak	-4.11%	-3.65%	-0.46%
Average Drawdown Average peak-to-trough decline	-14.68%	-10.67%	-4.01%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.81%	5.72%	-0.91%

Volatility

ACFOX vs. PRGFX - Volatility Comparison

American Century Investments Focused Dynamic Growth Fund (ACFOX) has a higher volatility of 7.93% compared to T. Rowe Price Growth Stock Fund (PRGFX) at 6.30%. This indicates that ACFOX's price experiences larger fluctuations and is considered to be riskier than PRGFX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACFOX	PRGFX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.93%	6.30%	+1.63%
Volatility (6M) Calculated over the trailing 6-month period	16.19%	13.08%	+3.11%
Volatility (1Y) Calculated over the trailing 1-year period	19.98%	16.69%	+3.29%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	25.43%	23.18%	+2.25%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.91%	22.16%	+1.75%

ACFOX vs. PRGFX - Expense Ratio Comparison

ACFOX has a 0.85% expense ratio, which is higher than PRGFX's 0.63% expense ratio.

Dividends

ACFOX vs. PRGFX - Dividend Comparison

ACFOX's dividend yield for the trailing twelve months is around 7.13%, less than PRGFX's 13.12% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACFOX American Century Investments Focused Dynamic Growth Fund	7.13%	7.56%	0.00%	0.00%	0.00%	2.48%	0.62%	0.00%	0.00%	0.00%	1.15%	1.33%
PRGFX T. Rowe Price Growth Stock Fund	13.12%	13.58%	13.26%	3.34%	3.55%	9.34%	3.51%	1.81%	9.09%	13.57%	2.22%	7.23%

Frequently Asked Questions

Can I hold both ACFOX and PRGFX in my portfolio?

With a correlation of 0.92, ACFOX and PRGFX 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, ACFOX or PRGFX?

ACFOX has higher volatility (7.93%) compared to PRGFX (6.30%). In terms of maximum drawdown, ACFOX dropped -58.92% vs PRGFX's -54.01%.

Which has better risk-adjusted returns?

ACFOX currently has the higher Sharpe Ratio (1.45 vs 1.15), 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.