TWMIX vs. TWCUX

Last updated Jun 5, 2026

TWMIX (American Century Emerging Markets Fund) and TWCUX (American Century Ultra Fund) are both mutual funds - TWMIX is a Emerging Markets Diversified fund managed by American Century, while TWCUX is a Large Cap Growth Equities fund managed by American Century. Over the past 10 years, TWMIX returned 10.67%/yr vs 18.10%/yr for TWCUX. A 0.60 correlation means they provide meaningful diversification when combined. TWMIX charges 1.26%/yr vs 0.93%/yr for TWCUX.

Performance

TWMIX vs. TWCUX - Performance Comparison

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

Returns By Period

In the year-to-date period, TWMIX achieves a 36.66% return, which is significantly higher than TWCUX's 7.91% return. Over the past 10 years, TWMIX has underperformed TWCUX with an annualized return of 10.67%, while TWCUX has yielded a comparatively higher 18.10% annualized return.

TWMIX

• 1D: -0.49%
• 1M: 8.51%
• YTD: 36.66%
• 6M: 40.44%
• 1Y: 71.28%
• 3Y*: 29.19%
• 5Y*: 6.98%
• 10Y*: 10.67%

TWCUX

• 1D: -1.62%
• 1M: 3.99%
• YTD: 7.91%
• 6M: 6.18%
• 1Y: 22.99%
• 3Y*: 21.28%
• 5Y*: 12.30%
• 10Y*: 18.10%

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

TWMIX vs. TWCUX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
TWMIX American Century Emerging Markets Fund	36.66%	35.27%	11.44%	5.43%	-28.14%	-6.04%	25.13%	21.94%	-19.14%	45.85%
TWCUX American Century Ultra Fund	7.91%	12.66%	29.54%	43.36%	-32.38%	23.47%	49.79%	34.60%	0.70%	31.65%

Correlation

The correlation between TWMIX and TWCUX is 0.69, 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	0.69
Correlation (3Y) Calculated over the trailing 3-year period	0.63
Correlation (5Y) Calculated over the trailing 5-year period	0.63
Correlation (10Y) Calculated over the trailing 10-year period	0.65
Correlation (All Time) Calculated using the full available price history since Oct 1, 1997	0.60

The correlation between TWMIX and TWCUX has been stable across timeframes, ranging from 0.60 to 0.69 - a consistent structural relationship.

Return for Risk

TWMIX vs. TWCUX — Risk / Return Rank

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

TWMIX

TWMIX Risk / Return Rank: 93
TWMIX Sharpe Ratio Rank: 97
TWMIX Sortino Ratio Rank: 89
TWMIX Omega Ratio Rank: 90
TWMIX Calmar Ratio Rank: 94
TWMIX Martin Ratio Rank: 95

TWCUX

TWCUX Risk / Return Rank: 22
TWCUX Sharpe Ratio Rank: 25
TWCUX Sortino Ratio Rank: 23
TWCUX Omega Ratio Rank: 22
TWCUX Calmar Ratio Rank: 18
TWCUX 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.

TWMIX vs. TWCUX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Emerging Markets Fund (TWMIX) 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.

	TWMIX	TWCUX	Difference
Sharpe ratio: Return per unit of total volatility	3.67	1.45	+2.23
Sortino ratio: Return per unit of downside risk	4.38	2.01	+2.37
Omega ratio: Gain probability vs. loss probability	1.66	1.25	+0.41
Calmar ratio: Return relative to maximum drawdown	5.53	1.51	+4.02
Martin ratio: Return relative to average drawdown	21.98	5.28	+16.70
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

TWMIX vs. TWCUX - Sharpe Ratio Comparison

The current TWMIX Sharpe Ratio is 3.67, which is higher than the TWCUX Sharpe Ratio of 1.45. The chart below compares the historical Sharpe Ratios of TWMIX and TWCUX, 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

	TWMIX	TWCUX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	3.67	1.45	+2.23
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.38	0.55	-0.17
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	0.82	-0.26
Sharpe Ratio (All Time) Calculated using the full available price history	0.36	0.53	-0.17

Drawdowns

TWMIX vs. TWCUX - Drawdown Comparison

The maximum TWMIX drawdown since its inception was -68.57%, which is greater than TWCUX's maximum drawdown of -62.11%. Use the drawdown chart below to compare losses from any high point for TWMIX and TWCUX.

Drawdown Indicators

	TWMIX	TWCUX	Difference
Max Drawdown Largest peak-to-trough decline	-68.57%	-62.11%	-6.46%
Max Drawdown (1Y) Largest decline over 1 year	-13.29%	-15.72%	+2.43%
Max Drawdown (3Y) Largest decline over 3 years	-16.63%	-24.86%	+8.23%
Max Drawdown (5Y) Largest decline over 5 years	-43.53%	-35.23%	-8.30%
Max Drawdown (10Y) Largest decline over 10 years	-47.51%	-35.23%	-12.28%
Current Drawdown Current decline from peak	-0.49%	-2.00%	+1.51%
Average Drawdown Average peak-to-trough decline	-24.45%	-16.81%	-7.64%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.34%	4.48%	-1.14%

Volatility

TWMIX vs. TWCUX - Volatility Comparison

American Century Emerging Markets Fund (TWMIX) has a higher volatility of 8.50% compared to American Century Ultra Fund (TWCUX) at 4.24%. This indicates that TWMIX's price experiences larger fluctuations and is considered to be riskier than TWCUX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	TWMIX	TWCUX	Difference
Volatility (1M) Calculated over the trailing 1-month period	8.50%	4.24%	+4.26%
Volatility (6M) Calculated over the trailing 6-month period	17.21%	12.44%	+4.77%
Volatility (1Y) Calculated over the trailing 1-year period	20.02%	16.39%	+3.63%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.38%	22.56%	-4.18%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.16%	22.08%	-2.92%

TWMIX vs. TWCUX - Expense Ratio Comparison

TWMIX has a 1.26% expense ratio, which is higher than TWCUX's 0.93% expense ratio.

Dividends

TWMIX vs. TWCUX - Dividend Comparison

TWMIX's dividend yield for the trailing twelve months is around 0.84%, less than TWCUX's 10.73% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
TWCUX American Century Ultra Fund	10.73%	11.57%	3.58%	6.09%	7.42%	6.78%	2.80%	4.27%	8.24%	5.85%	4.58%	5.21%
TWMIX American Century Emerging Markets Fund	0.84%	1.14%	0.71%	1.30%	3.37%	0.58%	0.97%	0.48%	0.92%	0.24%	0.12%	0.08%

Frequently Asked Questions

Can I hold both TWMIX and TWCUX in my portfolio?

TWMIX and TWCUX have a correlation of 0.69, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, TWMIX or TWCUX?

TWMIX has higher volatility (8.50%) compared to TWCUX (4.24%). In terms of maximum drawdown, TWMIX dropped -68.57% vs TWCUX's -62.11%.

Which has better risk-adjusted returns?

TWMIX currently has the higher Sharpe Ratio (3.67 vs 1.45), 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.