FGCKX vs. ACIHX

Last updated Jun 4, 2026

FGCKX (Fidelity Growth Company K) and ACIHX (American Century Growth Fund G Class) are both Large Cap Growth Equities funds. Both are actively managed. Over the past 3 years, FGCKX returned 31.78%/yr vs 23.07%/yr for ACIHX. With a 0.96 correlation, they move nearly in lockstep. FGCKX charges 0.65%/yr vs 0.01%/yr for ACIHX.

Performance

FGCKX vs. ACIHX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Growth Company K (FGCKX) and American Century Growth Fund G Class (ACIHX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FGCKX achieves a 23.78% return, which is significantly higher than ACIHX's 8.95% return.

FGCKX

• 1D: 0.05%
• 1M: 8.79%
• YTD: 23.78%
• 6M: 20.00%
• 1Y: 48.64%
• 3Y*: 31.78%
• 5Y*: 17.62%
• 10Y*: 23.10%

ACIHX

• 1D: -0.51%
• 1M: 7.84%
• YTD: 8.95%
• 6M: 8.02%
• 1Y: 27.75%
• 3Y*: 23.07%
• 5Y*: —
• 10Y*: —

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

FGCKX vs. ACIHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
FGCKX Fidelity Growth Company K	23.78%	18.67%	37.30%	47.35%	-6.73%
ACIHX American Century Growth Fund G Class	8.95%	16.26%	27.35%	44.64%	-6.24%

Correlation

The correlation between FGCKX and ACIHX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.95
Correlation (All Time) Calculated using the full available price history since May 17, 2022	0.96

The correlation between FGCKX and ACIHX has been stable across timeframes, ranging from 0.94 to 0.96 - a consistent structural relationship.

Return for Risk

FGCKX vs. ACIHX — Risk / Return Rank

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

FGCKX

FGCKX Risk / Return Rank: 77
FGCKX Sharpe Ratio Rank: 85
FGCKX Sortino Ratio Rank: 65
FGCKX Omega Ratio Rank: 68
FGCKX Calmar Ratio Rank: 85
FGCKX Martin Ratio Rank: 81

ACIHX

ACIHX Risk / Return Rank: 31
ACIHX Sharpe Ratio Rank: 40
ACIHX Sortino Ratio Rank: 36
ACIHX Omega Ratio Rank: 36
ACIHX Calmar Ratio Rank: 22
ACIHX 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.

FGCKX vs. ACIHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Growth Company K (FGCKX) and American Century Growth Fund G Class (ACIHX). 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.

	FGCKX	ACIHX	Difference
Sharpe ratio: Return per unit of total volatility	2.75	1.83	+0.92
Sortino ratio: Return per unit of downside risk	3.36	2.48	+0.87
Omega ratio: Gain probability vs. loss probability	1.46	1.32	+0.14
Calmar ratio: Return relative to maximum drawdown	4.03	1.75	+2.28
Martin ratio: Return relative to average drawdown	15.19	5.88	+9.30
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FGCKX vs. ACIHX - Sharpe Ratio Comparison

The current FGCKX Sharpe Ratio is 2.75, which is higher than the ACIHX Sharpe Ratio of 1.83. The chart below compares the historical Sharpe Ratios of FGCKX and ACIHX, 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

	FGCKX	ACIHX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.75	1.83	+0.92
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.74	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.99	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.72	1.02	-0.30

Drawdowns

FGCKX vs. ACIHX - Drawdown Comparison

The maximum FGCKX drawdown since its inception was -51.01%, which is greater than ACIHX's maximum drawdown of -24.00%. Use the drawdown chart below to compare losses from any high point for FGCKX and ACIHX.

Drawdown Indicators

	FGCKX	ACIHX	Difference
Max Drawdown Largest peak-to-trough decline	-51.01%	-24.00%	-27.01%
Max Drawdown (1Y) Largest decline over 1 year	-12.55%	-16.40%	+3.85%
Max Drawdown (3Y) Largest decline over 3 years	-26.20%	-24.00%	-2.20%
Max Drawdown (5Y) Largest decline over 5 years	-40.21%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-40.21%	—	—
Current Drawdown Current decline from peak	0.00%	-0.51%	+0.51%
Average Drawdown Average peak-to-trough decline	-8.96%	-4.89%	-4.07%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.32%	4.87%	-1.55%

Volatility

FGCKX vs. ACIHX - Volatility Comparison

Fidelity Growth Company K (FGCKX) has a higher volatility of 4.39% compared to American Century Growth Fund G Class (ACIHX) at 3.44%. This indicates that FGCKX's price experiences larger fluctuations and is considered to be riskier than ACIHX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FGCKX	ACIHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.39%	3.44%	+0.95%
Volatility (6M) Calculated over the trailing 6-month period	14.40%	11.92%	+2.48%
Volatility (1Y) Calculated over the trailing 1-year period	18.43%	15.71%	+2.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.02%	21.05%	+2.97%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.43%	21.05%	+2.38%

FGCKX vs. ACIHX - Expense Ratio Comparison

FGCKX has a 0.65% expense ratio, which is higher than ACIHX's 0.01% expense ratio.

Dividends

FGCKX vs. ACIHX - Dividend Comparison

FGCKX has not paid dividends to shareholders, while ACIHX's dividend yield for the trailing twelve months is around 14.64%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIHX American Century Growth Fund G Class	14.64%	15.95%	5.65%	4.61%	2.86%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
FGCKX Fidelity Growth Company K	0.00%	0.00%	8.80%	3.81%	7.16%	10.63%	8.83%	3.84%	6.38%	4.73%	6.20%	3.96%

Frequently Asked Questions

Can I hold both FGCKX and ACIHX in my portfolio?

With a correlation of 0.94, FGCKX and ACIHX 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, FGCKX or ACIHX?

FGCKX has higher volatility (4.39%) compared to ACIHX (3.44%). In terms of maximum drawdown, FGCKX dropped -51.01% vs ACIHX's -24.00%.

Which has better risk-adjusted returns?

FGCKX currently has the higher Sharpe Ratio (2.75 vs 1.83), 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.