FMKFX vs. ACIHX

Last updated Jul 3, 2026

FMKFX (Fidelity Magellan K6 Fund) and ACIHX (American Century Growth Fund G Class) are both Large Cap Growth Equities funds. Over the past 3 years, FMKFX returned 20.35%/yr vs 20.27%/yr for ACIHX. Their correlation of 0.93 suggests significant overlap in exposure. FMKFX charges 0.45%/yr vs 0.01%/yr for ACIHX.

Performance

FMKFX vs. ACIHX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity Magellan K6 Fund (FMKFX) 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, FMKFX achieves a 6.86% return, which is significantly higher than ACIHX's 5.18% return.

FMKFX

• 1D: -0.94%
• 1M: -1.77%
• 6M: 6.86%
• YTD: 6.86%
• 1Y: 7.88%
• 3Y*: 20.35%
• 5Y*: 11.22%
• 10Y*: —

ACIHX

• 1D: 0.08%
• 1M: -3.46%
• 6M: 5.18%
• YTD: 5.18%
• 1Y: 18.35%
• 3Y*: 20.27%
• 5Y*: —
• 10Y*: —

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

FMKFX vs. ACIHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
FMKFX Fidelity Magellan K6 Fund	6.86%	10.90%	33.14%	31.33%	-3.62%
ACIHX American Century Growth Fund G Class	5.18%	16.26%	27.35%	44.64%	-6.24%

Correlation

The correlation between FMKFX and ACIHX is 0.89, 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	0.89
Correlation (3Y) Calculated over the trailing 3-year period	0.91
Correlation (All Time) Calculated using the full available price history since May 16, 2022	0.93

The correlation between FMKFX and ACIHX has been stable across timeframes, ranging from 0.89 to 0.93 - a consistent structural relationship.

Return for Risk

FMKFX vs. ACIHX — Risk / Return Rank

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

FMKFX

FMKFX Risk / Return Rank: 9
FMKFX Sharpe Ratio Rank: 8
FMKFX Sortino Ratio Rank: 8
FMKFX Omega Ratio Rank: 9
FMKFX Calmar Ratio Rank: 8
FMKFX Martin Ratio Rank: 10

ACIHX

ACIHX Risk / Return Rank: 23
ACIHX Sharpe Ratio Rank: 26
ACIHX Sortino Ratio Rank: 25
ACIHX Omega Ratio Rank: 25
ACIHX Calmar Ratio Rank: 18
ACIHX Martin Ratio Rank: 19

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.

FMKFX vs. ACIHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity Magellan K6 Fund (FMKFX) 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.

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.

	FMKFX	ACIHX	Difference
Sharpe ratio: Return per unit of total volatility	0.50	1.15	-0.65
Sortino ratio: Return per unit of downside risk	0.79	1.64	-0.84
Omega ratio: Gain probability vs. loss probability	1.10	1.21	-0.11
Calmar ratio: Return relative to maximum drawdown	0.57	1.18	-0.61
Martin ratio: Return relative to average drawdown	1.98	3.77	-1.79

FMKFX vs. ACIHX - Sharpe Ratio Comparison

The current FMKFX Sharpe Ratio is 0.50, which is lower than the ACIHX Sharpe Ratio of 1.15. The chart below compares the historical Sharpe Ratios of FMKFX 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.

Drawdowns

FMKFX vs. ACIHX - Drawdown Comparison

The maximum FMKFX drawdown since its inception was -32.73%, which is greater than ACIHX's maximum drawdown of -24.00%. Use the drawdown chart below to compare losses from any high point for FMKFX and ACIHX.

Drawdown Indicators

	FMKFX	ACIHX	Difference
Max Drawdown Largest peak-to-trough decline	-32.73%	-24.00%	-8.73%
Max Drawdown (1Y) Largest decline over 1 year	-13.86%	-16.40%	+2.54%
Max Drawdown (3Y) Largest decline over 3 years	-20.05%	-24.00%	+3.95%
Max Drawdown (5Y) Largest decline over 5 years	-32.73%	—	—
Current Drawdown Current decline from peak	-1.77%	-3.95%	+2.18%
Average Drawdown Average peak-to-trough decline	-7.67%	-4.89%	-2.78%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.94%	5.10%	-1.16%

Volatility

FMKFX vs. ACIHX - Volatility Comparison

Fidelity Magellan K6 Fund (FMKFX) has a higher volatility of 7.38% compared to American Century Growth Fund G Class (ACIHX) at 6.83%. This indicates that FMKFX'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

	FMKFX	ACIHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.38%	6.83%	+0.55%
Volatility (6M) Calculated over the trailing 6-month period	13.08%	13.24%	-0.16%
Volatility (1Y) Calculated over the trailing 1-year period	15.71%	16.75%	-1.04%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	20.29%	21.10%	-0.81%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	22.36%	21.10%	+1.26%

FMKFX vs. ACIHX - Expense Ratio Comparison

FMKFX has a 0.45% expense ratio, which is higher than ACIHX's 0.01% expense ratio.

Dividends

FMKFX vs. ACIHX - Dividend Comparison

FMKFX's dividend yield for the trailing twelve months is around 6.17%, less than ACIHX's 15.16% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019
ACIHX American Century Growth Fund G Class	15.16%	15.95%	5.65%	4.61%	2.86%	0.00%	0.00%	0.00%
FMKFX Fidelity Magellan K6 Fund	6.17%	7.74%	9.56%	2.33%	0.31%	4.10%	0.33%	0.28%

Frequently Asked Questions

Can I hold both FMKFX and ACIHX in my portfolio?

FMKFX and ACIHX have a correlation of 0.89, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, FMKFX or ACIHX?

FMKFX has higher volatility (7.38%) compared to ACIHX (6.83%). In terms of maximum drawdown, FMKFX dropped -32.73% vs ACIHX's -24.00%.

Which has better risk-adjusted returns?

ACIHX currently has the higher Sharpe Ratio (1.15 vs 0.50), 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.