KLGAX vs. ACIHX

Last updated Jun 5, 2026

KLGAX (MainStay WMC Growth Fund) and ACIHX (American Century Growth Fund G Class) are both Large Cap Growth Equities funds. Over the past 3 years, KLGAX returned 19.94%/yr vs 22.42%/yr for ACIHX. With a 0.98 correlation, they move nearly in lockstep. KLGAX charges 1.02%/yr vs 0.01%/yr for ACIHX.

Performance

KLGAX vs. ACIHX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in MainStay WMC Growth Fund (KLGAX) 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, KLGAX achieves a 4.46% return, which is significantly lower than ACIHX's 7.24% return.

KLGAX

• 1D: -1.24%
• 1M: 4.24%
• YTD: 4.46%
• 6M: 3.72%
• 1Y: 18.28%
• 3Y*: 19.94%
• 5Y*: 9.36%
• 10Y*: 13.65%

ACIHX

• 1D: -1.57%
• 1M: 5.48%
• YTD: 7.24%
• 6M: 6.26%
• 1Y: 25.16%
• 3Y*: 22.42%
• 5Y*: —
• 10Y*: —

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

KLGAX vs. ACIHX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
KLGAX MainStay WMC Growth Fund	4.46%	16.60%	25.22%	38.63%	-7.47%
ACIHX American Century Growth Fund G Class	7.24%	16.26%	27.35%	44.64%	-6.24%

Correlation

The correlation between KLGAX and ACIHX is 0.97 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.97
Correlation (3Y) Calculated over the trailing 3-year period	0.97
Correlation (All Time) Calculated using the full available price history since May 17, 2022	0.98

The correlation between KLGAX and ACIHX has been stable across timeframes, ranging from 0.97 to 0.98 - a consistent structural relationship.

Return for Risk

KLGAX vs. ACIHX — Risk / Return Rank

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

KLGAX

KLGAX Risk / Return Rank: 16
KLGAX Sharpe Ratio Rank: 18
KLGAX Sortino Ratio Rank: 17
KLGAX Omega Ratio Rank: 18
KLGAX Calmar Ratio Rank: 14
KLGAX Martin Ratio Rank: 15

ACIHX

ACIHX Risk / Return Rank: 26
ACIHX Sharpe Ratio Rank: 32
ACIHX Sortino Ratio Rank: 29
ACIHX Omega Ratio Rank: 30
ACIHX Calmar Ratio Rank: 19
ACIHX Martin Ratio Rank: 20

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.

KLGAX vs. ACIHX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for MainStay WMC Growth Fund (KLGAX) 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.

	KLGAX	ACIHX	Difference
Sharpe ratio: Return per unit of total volatility	1.20	1.64	-0.44
Sortino ratio: Return per unit of downside risk	1.71	2.25	-0.54
Omega ratio: Gain probability vs. loss probability	1.22	1.29	-0.07
Calmar ratio: Return relative to maximum drawdown	1.20	1.58	-0.38
Martin ratio: Return relative to average drawdown	4.10	5.29	-1.20
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

KLGAX vs. ACIHX - Sharpe Ratio Comparison

The current KLGAX Sharpe Ratio is 1.20, which is comparable to the ACIHX Sharpe Ratio of 1.64. The chart below compares the historical Sharpe Ratios of KLGAX 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

	KLGAX	ACIHX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.20	1.64	-0.44
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.42	—	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.62	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.45	1.00	-0.54

Drawdowns

KLGAX vs. ACIHX - Drawdown Comparison

The maximum KLGAX drawdown since its inception was -55.04%, which is greater than ACIHX's maximum drawdown of -24.00%. Use the drawdown chart below to compare losses from any high point for KLGAX and ACIHX.

Drawdown Indicators

	KLGAX	ACIHX	Difference
Max Drawdown Largest peak-to-trough decline	-55.04%	-24.00%	-31.04%
Max Drawdown (1Y) Largest decline over 1 year	-16.03%	-16.40%	+0.37%
Max Drawdown (3Y) Largest decline over 3 years	-22.71%	-24.00%	+1.29%
Max Drawdown (5Y) Largest decline over 5 years	-39.29%	—	—
Max Drawdown (10Y) Largest decline over 10 years	-39.29%	—	—
Current Drawdown Current decline from peak	-1.80%	-2.07%	+0.27%
Average Drawdown Average peak-to-trough decline	-9.49%	-4.89%	-4.60%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.66%	4.87%	-0.21%

Volatility

KLGAX vs. ACIHX - Volatility Comparison

MainStay WMC Growth Fund (KLGAX) and American Century Growth Fund G Class (ACIHX) have volatilities of 3.79% and 3.93%, 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

	KLGAX	ACIHX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.79%	3.93%	-0.14%
Volatility (6M) Calculated over the trailing 6-month period	12.12%	12.02%	+0.10%
Volatility (1Y) Calculated over the trailing 1-year period	15.99%	15.80%	+0.19%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	22.53%	21.06%	+1.47%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.94%	21.06%	+0.88%

KLGAX vs. ACIHX - Expense Ratio Comparison

KLGAX has a 1.02% expense ratio, which is higher than ACIHX's 0.01% expense ratio.

Dividends

KLGAX vs. ACIHX - Dividend Comparison

KLGAX's dividend yield for the trailing twelve months is around 3.23%, less than ACIHX's 14.87% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIHX American Century Growth Fund G Class	14.87%	15.95%	5.65%	4.61%	2.86%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
KLGAX MainStay WMC Growth Fund	3.23%	3.38%	3.96%	0.00%	0.00%	26.57%	3.69%	3.43%	11.10%	3.85%	8.73%	7.55%

Frequently Asked Questions

Can I hold both KLGAX and ACIHX in my portfolio?

With a correlation of 0.97, KLGAX 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, KLGAX or ACIHX?

ACIHX has higher volatility (3.93%) compared to KLGAX (3.79%). In terms of maximum drawdown, KLGAX dropped -55.04% vs ACIHX's -24.00%.

Which has better risk-adjusted returns?

ACIHX currently has the higher Sharpe Ratio (1.64 vs 1.20), 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.