MYIFX vs. ACIHX

Last updated Jun 23, 2026

MYIFX (Monetta Young Investor Growth Fund) and ACIHX (American Century Growth Fund G Class) are both Large Cap Growth Equities funds. Over the past 3 years, MYIFX returned 20.50%/yr vs 20.56%/yr for ACIHX. With a 0.96 correlation, they move nearly in lockstep. MYIFX charges 1.37%/yr vs 0.01%/yr for ACIHX.

Performance

MYIFX vs. ACIHX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Monetta Young Investor Growth Fund (MYIFX) 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, MYIFX achieves a 8.44% return, which is significantly higher than ACIHX's 4.95% return.

MYIFX

• 1D: 1.30%
• 1M: -0.20%
• YTD: 8.44%
• 6M: 7.98%
• 1Y: 23.56%
• 3Y*: 20.50%
• 5Y*: 12.08%
• 10Y*: 14.48%

ACIHX

• 1D: 1.47%
• 1M: -0.26%
• YTD: 4.95%
• 6M: 4.49%
• 1Y: 23.59%
• 3Y*: 20.56%
• 5Y*: —
• 10Y*: —

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

MYIFX vs. ACIHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
MYIFX Monetta Young Investor Growth Fund	8.44%	15.41%	27.54%	32.92%	-8.71%
ACIHX American Century Growth Fund G Class	4.95%	16.26%	27.35%	44.64%	-6.24%

Correlation

The correlation between MYIFX 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 16, 2022	0.96

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

Return for Risk

MYIFX vs. ACIHX — Risk / Return Rank

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

MYIFX

MYIFX Risk / Return Rank: 35
MYIFX Sharpe Ratio Rank: 37
MYIFX Sortino Ratio Rank: 33
MYIFX Omega Ratio Rank: 35
MYIFX Calmar Ratio Rank: 31
MYIFX Martin Ratio Rank: 37

ACIHX

ACIHX Risk / Return Rank: 22
ACIHX Sharpe Ratio Rank: 27
ACIHX Sortino Ratio Rank: 24
ACIHX Omega Ratio Rank: 25
ACIHX Calmar Ratio Rank: 17
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.

MYIFX vs. ACIHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Monetta Young Investor Growth Fund (MYIFX) 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.

	MYIFX	ACIHX	Difference
Sharpe ratio: Return per unit of total volatility	1.64	1.38	+0.26
Sortino ratio: Return per unit of downside risk	2.25	1.91	+0.33
Omega ratio: Gain probability vs. loss probability	1.29	1.24	+0.05
Calmar ratio: Return relative to maximum drawdown	1.98	1.39	+0.59
Martin ratio: Return relative to average drawdown	7.70	4.58	+3.13

MYIFX vs. ACIHX - Sharpe Ratio Comparison

The current MYIFX Sharpe Ratio is 1.64, which is comparable to the ACIHX Sharpe Ratio of 1.38. The chart below compares the historical Sharpe Ratios of MYIFX 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

MYIFX vs. ACIHX - Drawdown Comparison

The maximum MYIFX drawdown since its inception was -45.61%, which is greater than ACIHX's maximum drawdown of -24.00%. Use the drawdown chart below to compare losses from any high point for MYIFX and ACIHX.

Drawdown Indicators

	MYIFX	ACIHX	Difference
Max Drawdown Largest peak-to-trough decline	-45.61%	-24.00%	-21.61%
Max Drawdown (1Y) Largest decline over 1 year	-11.69%	-16.40%	+4.71%
Max Drawdown (3Y) Largest decline over 3 years	-20.52%	-24.00%	+3.48%
Max Drawdown (5Y) Largest decline over 5 years	-28.95%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-32.65%	—	—
Current Drawdown Current decline from peak	-2.41%	-4.16%	+1.75%
Average Drawdown Average peak-to-trough decline	-5.84%	-4.88%	-0.96%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.00%	4.98%	-1.98%

Volatility

MYIFX vs. ACIHX - Volatility Comparison

The current volatility for Monetta Young Investor Growth Fund (MYIFX) is 5.53%, while American Century Growth Fund G Class (ACIHX) has a volatility of 6.36%. This indicates that MYIFX experiences smaller price fluctuations and is considered to be less risky than ACIHX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MYIFX	ACIHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.53%	6.36%	-0.83%
Volatility (6M) Calculated over the trailing 6-month period	11.04%	13.07%	-2.03%
Volatility (1Y) Calculated over the trailing 1-year period	14.13%	16.53%	-2.40%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.79%	21.11%	-2.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.40%	21.11%	-1.71%

MYIFX vs. ACIHX - Expense Ratio Comparison

MYIFX has a 1.37% expense ratio, which is higher than ACIHX's 0.01% expense ratio.

Dividends

MYIFX vs. ACIHX - Dividend Comparison

MYIFX's dividend yield for the trailing twelve months is around 17.52%, more than ACIHX's 15.20% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIHX American Century Growth Fund G Class	15.20%	15.95%	5.65%	4.61%	2.86%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
MYIFX Monetta Young Investor Growth Fund	17.52%	19.00%	12.37%	7.18%	8.32%	21.74%	37.08%	7.34%	24.02%	3.81%	0.84%	10.53%

Frequently Asked Questions

Can I hold both MYIFX and ACIHX in my portfolio?

With a correlation of 0.94, MYIFX 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, MYIFX or ACIHX?

ACIHX has higher volatility (6.36%) compared to MYIFX (5.53%). In terms of maximum drawdown, MYIFX dropped -45.61% vs ACIHX's -24.00%.

Which has better risk-adjusted returns?

MYIFX currently has the higher Sharpe Ratio (1.64 vs 1.38), 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.