ACIHX vs. TWCUX

Last updated Apr 1, 2026

Compare and contrast key facts about American Century Growth Fund G Class (ACIHX) and American Century Ultra Fund (TWCUX).

ACIHX is an actively managed fund by American Century. It was launched on Mar 1, 2022. TWCUX is managed by American Century. It was launched on Nov 2, 1981.

Performance

ACIHX vs. TWCUX - Performance Comparison

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

ACIHX vs. TWCUX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022
ACIHX American Century Growth Fund G Class	-13.30%	16.26%	27.35%	44.64%	-6.24%
TWCUX American Century Ultra Fund	-12.28%	12.66%	29.54%	43.36%	-7.70%

Returns By Period

In the year-to-date period, ACIHX achieves a -13.30% return, which is significantly lower than TWCUX's -12.28% return.

ACIHX

• 1D: -0.39%
• 1M: -8.72%
• YTD: -13.30%
• 6M: -12.27%
• 1Y: 13.26%
• 3Y*: 17.20%
• 5Y*: —
• 10Y*: —

TWCUX

• 1D: -0.65%
• 1M: -8.79%
• YTD: -12.28%
• 6M: -10.88%
• 1Y: 11.48%
• 3Y*: 16.46%
• 5Y*: 8.90%
• 10Y*: 15.69%

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

ACIHX vs. TWCUX - Expense Ratio Comparison

ACIHX has a 0.01% expense ratio, which is lower than TWCUX's 0.93% expense ratio.

TWCUX

American Century Ultra Fund

ACIHX

American Century Growth Fund G Class

Return for Risk

ACIHX vs. TWCUX — Risk / Return Rank

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

ACIHX

ACIHX Risk / Return Rank: 23
ACIHX Sharpe Ratio Rank: 23
ACIHX Sortino Ratio Rank: 27
ACIHX Omega Ratio Rank: 25
ACIHX Calmar Ratio Rank: 21
ACIHX Martin Ratio Rank: 21

TWCUX

TWCUX Risk / Return Rank: 20
TWCUX Sharpe Ratio Rank: 20
TWCUX Sortino Ratio Rank: 23
TWCUX Omega Ratio Rank: 22
TWCUX Calmar Ratio Rank: 18
TWCUX Martin Ratio Rank: 18

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.

ACIHX vs. TWCUX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Growth Fund G Class (ACIHX) and American Century Ultra Fund (TWCUX). 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.

	ACIHX	TWCUX	Difference
Sharpe ratio Return per unit of total volatility	0.59	0.50	+0.10
Sortino ratio Return per unit of downside risk	1.02	0.88	+0.13
Omega ratio Gain probability vs. loss probability	1.14	1.12	+0.02
Calmar ratio Return relative to maximum drawdown	0.63	0.53	+0.10
Martin ratio Return relative to average drawdown	2.21	1.87	+0.34
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ACIHX vs. TWCUX - Sharpe Ratio Comparison

The current ACIHX Sharpe Ratio is 0.59, which is comparable to the TWCUX Sharpe Ratio of 0.50. The chart below compares the historical Sharpe Ratios of ACIHX and TWCUX, offering insights into how both investments have performed under varying market conditions. These values are calculated using daily returns over the previous 12 months.

Sharpe Ratios by Period

	ACIHX	TWCUX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	0.59	0.50	+0.10
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	—	0.40	—
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	—	0.72	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.73	0.51	+0.22

Correlation

The correlation between ACIHX and TWCUX is 0.99, which is considered to be high. That indicates a strong positive relationship between their price movements. Having highly-correlated positions in a portfolio may signal a lack of diversification, potentially leading to increased risk during market downturns.

Dividends

ACIHX vs. TWCUX - Dividend Comparison

ACIHX's dividend yield for the trailing twelve months is around 18.39%, more than TWCUX's 13.19% yield.

	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIHX American Century Growth Fund G Class	18.39%	15.95%	5.65%	4.61%	2.86%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
TWCUX American Century Ultra Fund	13.19%	11.57%	3.58%	6.09%	7.42%	6.78%	2.80%	4.27%	8.24%	5.85%	4.58%	5.21%

Drawdowns

ACIHX vs. TWCUX - Drawdown Comparison

The maximum ACIHX drawdown since its inception was -24.00%, smaller than the maximum TWCUX drawdown of -62.11%. Use the drawdown chart below to compare losses from any high point for ACIHX and TWCUX.

Drawdown Indicators

	ACIHX	TWCUX	Difference
Max Drawdown Largest peak-to-trough decline	-24.00%	-62.11%	+38.11%
Max Drawdown (1Y) Largest decline over 1 year	-16.40%	-15.72%	-0.68%
Max Drawdown (5Y) Largest decline over 5 years	—	-35.23%	—
Max Drawdown (10Y) Largest decline over 10 years	—	-35.23%	—
Current Drawdown Current decline from peak	-16.40%	-15.72%	-0.68%
Average Drawdown Average peak-to-trough decline	-4.95%	-16.86%	+11.91%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.68%	4.42%	+0.26%

Volatility

ACIHX vs. TWCUX - Volatility Comparison

The current volatility for American Century Growth Fund G Class (ACIHX) is 5.43%, while American Century Ultra Fund (TWCUX) has a volatility of 5.77%. This indicates that ACIHX experiences smaller price fluctuations and is considered to be less risky than TWCUX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACIHX	TWCUX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.43%	5.77%	-0.34%
Volatility (6M) Calculated over the trailing 6-month period	12.03%	12.65%	-0.62%
Volatility (1Y) Calculated over the trailing 1-year period	22.42%	23.09%	-0.67%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.21%	22.53%	-1.32%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.21%	22.00%	-0.79%