TWIEX vs. ACIIX

Last updated Jun 23, 2026

TWIEX (American Century International Growth Fund) and ACIIX (American Century Equity Income Fund Class I) are both mutual funds - TWIEX is a Foreign Large Cap Equities fund managed by American Century, while ACIIX is a Large Cap Value Equities fund managed by American Century. Over the past 10 years, TWIEX returned 6.97%/yr vs 8.93%/yr for ACIIX. A 0.61 correlation means they provide meaningful diversification when combined. TWIEX charges 1.36%/yr vs 0.72%/yr for ACIIX.

Performance

TWIEX vs. ACIIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century International Growth Fund (TWIEX) and American Century Equity Income Fund Class I (ACIIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, TWIEX achieves a 3.20% return, which is significantly lower than ACIIX's 7.40% return. Over the past 10 years, TWIEX has underperformed ACIIX with an annualized return of 6.97%, while ACIIX has yielded a comparatively higher 8.93% annualized return.

TWIEX

• 1D: 1.00%
• 1M: 1.57%
• YTD: 3.20%
• 6M: 3.12%
• 1Y: 8.27%
• 3Y*: 6.20%
• 5Y*: 1.07%
• 10Y*: 6.97%

ACIIX

• 1D: -0.11%
• 1M: -0.07%
• YTD: 7.40%
• 6M: 6.90%
• 1Y: 16.79%
• 3Y*: 10.55%
• 5Y*: 7.82%
• 10Y*: 8.93%

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

TWIEX vs. ACIIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWIEX American Century International Growth Fund	3.20%	15.58%	2.31%	12.31%	-24.98%	8.61%	25.59%	28.37%	-14.44%	31.04%
ACIIX American Century Equity Income Fund Class I	7.40%	12.05%	10.58%	4.25%	-2.96%	17.16%	1.19%	24.50%	-3.53%	13.69%

Correlation

The correlation between TWIEX and ACIIX is 0.52, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.52
Correlation (3Y) Calculated over the trailing 3-year period	0.53
Correlation (5Y) Calculated over the trailing 5-year period	0.63
Correlation (10Y) Calculated over the trailing 10-year period	0.64
Correlation (All Time) Calculated using the full available price history since Jul 8, 1998	0.61

The correlation between TWIEX and ACIIX shifts across timeframes, from 0.52 (1 year) to 0.64 (10 years), reflecting how their relationship changes across market environments.

Return for Risk

TWIEX vs. ACIIX — Risk / Return Rank

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

TWIEX

TWIEX Risk / Return Rank: 6
TWIEX Sharpe Ratio Rank: 6
TWIEX Sortino Ratio Rank: 6
TWIEX Omega Ratio Rank: 6
TWIEX Calmar Ratio Rank: 6
TWIEX Martin Ratio Rank: 7

ACIIX

ACIIX Risk / Return Rank: 52
ACIIX Sharpe Ratio Rank: 54
ACIIX Sortino Ratio Rank: 62
ACIIX Omega Ratio Rank: 49
ACIIX Calmar Ratio Rank: 53
ACIIX Martin Ratio Rank: 43

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.

TWIEX vs. ACIIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century International Growth Fund (TWIEX) and American Century Equity Income Fund Class I (ACIIX). 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.

	TWIEX	ACIIX	Difference
Sharpe ratio: Return per unit of total volatility	0.44	2.00	-1.56
Sortino ratio: Return per unit of downside risk	0.72	3.01	-2.29
Omega ratio: Gain probability vs. loss probability	1.09	1.35	-0.26
Calmar ratio: Return relative to maximum drawdown	0.56	2.67	-2.10
Martin ratio: Return relative to average drawdown	1.88	8.69	-6.81

TWIEX vs. ACIIX - Sharpe Ratio Comparison

The current TWIEX Sharpe Ratio is 0.44, which is lower than the ACIIX Sharpe Ratio of 2.00. The chart below compares the historical Sharpe Ratios of TWIEX and ACIIX, 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

TWIEX vs. ACIIX - Drawdown Comparison

The maximum TWIEX drawdown since its inception was -62.43%, which is greater than ACIIX's maximum drawdown of -39.16%. Use the drawdown chart below to compare losses from any high point for TWIEX and ACIIX.

Drawdown Indicators

	TWIEX	ACIIX	Difference
Max Drawdown Largest peak-to-trough decline	-62.43%	-39.16%	-23.27%
Max Drawdown (1Y) Largest decline over 1 year	-13.04%	-6.38%	-6.66%
Max Drawdown (3Y) Largest decline over 3 years	-17.41%	-10.15%	-7.26%
Max Drawdown (5Y) Largest decline over 5 years	-38.76%	-13.49%	-25.27%
Max Drawdown (10Y) Largest decline over 10 years	-38.76%	-32.76%	-6.00%
Current Drawdown Current decline from peak	-2.07%	-1.44%	-0.63%
Average Drawdown Average peak-to-trough decline	-16.63%	-5.24%	-11.39%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.91%	1.95%	+1.96%

Volatility

TWIEX vs. ACIIX - Volatility Comparison

American Century International Growth Fund (TWIEX) has a higher volatility of 5.84% compared to American Century Equity Income Fund Class I (ACIIX) at 2.57%. This indicates that TWIEX's price experiences larger fluctuations and is considered to be riskier than ACIIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWIEX	ACIIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.84%	2.57%	+3.27%
Volatility (6M) Calculated over the trailing 6-month period	14.24%	6.22%	+8.02%
Volatility (1Y) Calculated over the trailing 1-year period	16.82%	8.50%	+8.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.37%	10.77%	+7.60%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	18.21%	13.39%	+4.82%

TWIEX vs. ACIIX - Expense Ratio Comparison

TWIEX has a 1.36% expense ratio, which is higher than ACIIX's 0.72% expense ratio.

Dividends

TWIEX vs. ACIIX - Dividend Comparison

TWIEX's dividend yield for the trailing twelve months is around 3.20%, less than ACIIX's 10.86% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACIIX American Century Equity Income Fund Class I	10.86%	10.55%	11.71%	8.21%	8.96%	7.02%	2.18%	7.57%	9.05%	12.14%	8.08%	10.72%
TWIEX American Century International Growth Fund	3.20%	3.31%	1.01%	0.00%	2.89%	12.00%	4.48%	0.37%	13.87%	5.31%	0.49%	5.66%

Frequently Asked Questions

Can I hold both TWIEX and ACIIX in my portfolio?

TWIEX and ACIIX have a correlation of 0.52, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TWIEX or ACIIX?

TWIEX has higher volatility (5.84%) compared to ACIIX (2.57%). In terms of maximum drawdown, TWIEX dropped -62.43% vs ACIIX's -39.16%.

Which has better risk-adjusted returns?

ACIIX currently has the higher Sharpe Ratio (2.00 vs 0.44), 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.