ACLAX vs. TWCIX

Last updated Jun 3, 2026

ACLAX (American Century Mid Cap Value Fund A Class) and TWCIX (American Century Select Fund) are both mutual funds - ACLAX is a Mid Cap Value Equities fund managed by American Century, while TWCIX is a Large Cap Growth Equities fund managed by American Century. Over the past 10 years, ACLAX returned 8.55%/yr vs 16.98%/yr for TWCIX. A 0.73 correlation means they provide meaningful diversification when combined. ACLAX charges 1.22%/yr vs 0.94%/yr for TWCIX.

Performance

ACLAX vs. TWCIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in American Century Mid Cap Value Fund A Class (ACLAX) and American Century Select Fund (TWCIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ACLAX achieves a 7.11% return, which is significantly lower than TWCIX's 9.24% return. Over the past 10 years, ACLAX has underperformed TWCIX with an annualized return of 8.55%, while TWCIX has yielded a comparatively higher 16.98% annualized return.

ACLAX

• 1D: -0.19%
• 1M: 0.51%
• YTD: 7.11%
• 6M: 7.56%
• 1Y: 15.50%
• 3Y*: 10.38%
• 5Y*: 6.46%
• 10Y*: 8.55%

TWCIX

• 1D: 0.46%
• 1M: 5.57%
• YTD: 9.24%
• 6M: 8.80%
• 1Y: 29.43%
• 3Y*: 21.58%
• 5Y*: 13.46%
• 10Y*: 16.98%

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

ACLAX vs. TWCIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
ACLAX American Century Mid Cap Value Fund A Class	7.11%	8.52%	8.18%	5.93%	-1.53%	23.01%	1.44%	28.55%	-12.93%	11.31%
TWCIX American Century Select Fund	9.24%	16.30%	26.15%	39.93%	-28.82%	25.47%	33.99%	36.30%	-3.54%	28.90%

Correlation

The correlation between ACLAX and TWCIX is 0.29, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.29
Correlation (3Y) Calculated over the trailing 3-year period	0.36
Correlation (5Y) Calculated over the trailing 5-year period	0.52
Correlation (10Y) Calculated over the trailing 10-year period	0.57
Correlation (All Time) Calculated using the full available price history since Jan 14, 2005	0.73

Over the past year, the correlation between ACLAX and TWCIX has dropped to 0.29 - well below their long-term average of 0.73, suggesting their price drivers have been diverging.

Return for Risk

ACLAX vs. TWCIX — Risk / Return Rank

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

ACLAX

ACLAX Risk / Return Rank: 20
ACLAX Sharpe Ratio Rank: 19
ACLAX Sortino Ratio Rank: 21
ACLAX Omega Ratio Rank: 18
ACLAX Calmar Ratio Rank: 21
ACLAX Martin Ratio Rank: 20

TWCIX

TWCIX Risk / Return Rank: 36
TWCIX Sharpe Ratio Rank: 42
TWCIX Sortino Ratio Rank: 37
TWCIX Omega Ratio Rank: 38
TWCIX Calmar Ratio Rank: 28
TWCIX Martin Ratio Rank: 33

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.

ACLAX vs. TWCIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for American Century Mid Cap Value Fund A Class (ACLAX) and American Century Select Fund (TWCIX). 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.

	ACLAX	TWCIX	Difference
Sharpe ratio Return per unit of total volatility	1.27	1.91	-0.64
Sortino ratio Return per unit of downside risk	1.96	2.56	-0.61
Omega ratio Gain probability vs. loss probability	1.22	1.33	-0.11
Calmar ratio Return relative to maximum drawdown	1.73	2.03	-0.30
Martin ratio Return relative to average drawdown	5.54	7.63	-2.08
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

ACLAX vs. TWCIX - Sharpe Ratio Comparison

The current ACLAX Sharpe Ratio is 1.27, which is lower than the TWCIX Sharpe Ratio of 1.91. The chart below compares the historical Sharpe Ratios of ACLAX and TWCIX, 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

	ACLAX	TWCIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.27	1.91	-0.64
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.44	0.63	-0.19
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.49	0.81	-0.32
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.59	-0.11

Drawdowns

ACLAX vs. TWCIX - Drawdown Comparison

The maximum ACLAX drawdown since its inception was -51.37%, smaller than the maximum TWCIX drawdown of -57.31%. Use the drawdown chart below to compare losses from any high point for ACLAX and TWCIX.

Drawdown Indicators

	ACLAX	TWCIX	Difference
Max Drawdown Largest peak-to-trough decline	-51.37%	-57.31%	+5.94%
Max Drawdown (1Y) Largest decline over 1 year	-8.50%	-14.66%	+6.16%
Max Drawdown (3Y) Largest decline over 3 years	-14.67%	-23.88%	+9.21%
Max Drawdown (5Y) Largest decline over 5 years	-17.55%	-31.24%	+13.69%
Max Drawdown (10Y) Largest decline over 10 years	-39.24%	-31.24%	-8.00%
Current Drawdown Current decline from peak	-2.37%	0.00%	-2.37%
Average Drawdown Average peak-to-trough decline	-6.26%	-12.39%	+6.13%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.65%	3.91%	-1.26%

Volatility

ACLAX vs. TWCIX - Volatility Comparison

The current volatility for American Century Mid Cap Value Fund A Class (ACLAX) is 2.94%, while American Century Select Fund (TWCIX) has a volatility of 3.56%. This indicates that ACLAX experiences smaller price fluctuations and is considered to be less risky than TWCIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ACLAX	TWCIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	2.94%	3.56%	-0.62%
Volatility (6M) Calculated over the trailing 6-month period	8.45%	12.03%	-3.58%
Volatility (1Y) Calculated over the trailing 1-year period	11.88%	15.90%	-4.02%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	14.65%	21.48%	-6.83%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	17.48%	21.03%	-3.55%

ACLAX vs. TWCIX - Expense Ratio Comparison

ACLAX has a 1.22% expense ratio, which is higher than TWCIX's 0.94% expense ratio.

Dividends

ACLAX vs. TWCIX - Dividend Comparison

ACLAX's dividend yield for the trailing twelve months is around 13.23%, more than TWCIX's 9.19% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACLAX American Century Mid Cap Value Fund A Class	13.23%	14.24%	8.53%	5.01%	14.77%	15.72%	1.62%	1.23%	14.17%	9.25%	3.82%	10.86%
TWCIX American Century Select Fund	9.19%	10.04%	3.67%	5.21%	10.36%	8.25%	6.26%	5.42%	9.05%	6.30%	3.43%	6.16%

Frequently Asked Questions

Can I hold both ACLAX and TWCIX in my portfolio?

ACLAX and TWCIX have a correlation of 0.29, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ACLAX or TWCIX?

TWCIX has higher volatility (3.56%) compared to ACLAX (2.94%). In terms of maximum drawdown, ACLAX dropped -51.37% vs TWCIX's -57.31%.

Which has better risk-adjusted returns?

TWCIX currently has the higher Sharpe Ratio (1.91 vs 1.27), 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.