NAMAX vs. ACLAX

Last updated Jun 6, 2026

NAMAX (Columbia Select Mid Cap Value Fund) and ACLAX (American Century Mid Cap Value Fund A Class) are both Mid Cap Value Equities funds. Over the past 10 years, NAMAX returned 11.11%/yr vs 8.68%/yr for ACLAX. Their correlation of 0.94 suggests significant overlap in exposure. NAMAX charges 0.88%/yr vs 1.22%/yr for ACLAX.

Performance

NAMAX vs. ACLAX - Performance Comparison

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

Returns By Period

In the year-to-date period, NAMAX achieves a 19.64% return, which is significantly higher than ACLAX's 9.08% return. Over the past 10 years, NAMAX has outperformed ACLAX with an annualized return of 11.11%, while ACLAX has yielded a comparatively lower 8.68% annualized return.

NAMAX

• 1D: 0.69%
• 1M: 2.16%
• YTD: 19.64%
• 6M: 19.45%
• 1Y: 36.53%
• 3Y*: 19.48%
• 5Y*: 10.73%
• 10Y*: 11.11%

ACLAX

• 1D: 1.07%
• 1M: 1.84%
• YTD: 9.08%
• 6M: 8.62%
• 1Y: 17.63%
• 3Y*: 11.30%
• 5Y*: 6.73%
• 10Y*: 8.68%

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

NAMAX vs. ACLAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NAMAX Columbia Select Mid Cap Value Fund	19.64%	13.77%	13.14%	9.65%	-9.33%	32.28%	6.90%	31.56%	-18.46%	13.71%
ACLAX American Century Mid Cap Value Fund A Class	9.08%	8.52%	8.18%	5.93%	-1.53%	23.01%	1.44%	28.55%	-12.93%	11.31%

Correlation

The correlation between NAMAX and ACLAX is 0.88, indicating a strong positive relationship between their price movements. Combining them offers limited diversification - they tend to fall together during downturns.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.88
Correlation (3Y) Calculated over the trailing 3-year period	0.89
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jan 14, 2005	0.94

The correlation between NAMAX and ACLAX has been stable across timeframes, ranging from 0.88 to 0.94 - a consistent structural relationship.

Return for Risk

NAMAX vs. ACLAX — Risk / Return Rank

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

NAMAX

NAMAX Risk / Return Rank: 82
NAMAX Sharpe Ratio Rank: 83
NAMAX Sortino Ratio Rank: 79
NAMAX Omega Ratio Rank: 72
NAMAX Calmar Ratio Rank: 89
NAMAX Martin Ratio Rank: 89

ACLAX

ACLAX Risk / Return Rank: 30
ACLAX Sharpe Ratio Rank: 29
ACLAX Sortino Ratio Rank: 32
ACLAX Omega Ratio Rank: 27
ACLAX Calmar Ratio Rank: 33
ACLAX Martin Ratio Rank: 30

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.

NAMAX vs. ACLAX - Risk-Adjusted Trends Comparison

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

	NAMAX	ACLAX	Difference
Sharpe ratio: Return per unit of total volatility	2.64	1.48	+1.17
Sortino ratio: Return per unit of downside risk	3.69	2.25	+1.44
Omega ratio: Gain probability vs. loss probability	1.46	1.26	+0.20
Calmar ratio: Return relative to maximum drawdown	4.35	2.06	+2.28
Martin ratio: Return relative to average drawdown	16.99	6.60	+10.39
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

NAMAX vs. ACLAX - Sharpe Ratio Comparison

The current NAMAX Sharpe Ratio is 2.64, which is higher than the ACLAX Sharpe Ratio of 1.48. The chart below compares the historical Sharpe Ratios of NAMAX and ACLAX, 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

	NAMAX	ACLAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.64	1.48	+1.17
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.59	0.46	+0.13
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.56	0.50	+0.06
Sharpe Ratio (All Time) Calculated using the full available price history	0.48	0.49	-0.01

Drawdowns

NAMAX vs. ACLAX - Drawdown Comparison

The maximum NAMAX drawdown since its inception was -60.44%, which is greater than ACLAX's maximum drawdown of -51.37%. Use the drawdown chart below to compare losses from any high point for NAMAX and ACLAX.

Drawdown Indicators

	NAMAX	ACLAX	Difference
Max Drawdown Largest peak-to-trough decline	-60.44%	-51.37%	-9.07%
Max Drawdown (1Y) Largest decline over 1 year	-8.49%	-8.50%	+0.01%
Max Drawdown (3Y) Largest decline over 3 years	-20.90%	-14.67%	-6.23%
Max Drawdown (5Y) Largest decline over 5 years	-20.90%	-17.55%	-3.35%
Max Drawdown (10Y) Largest decline over 10 years	-43.24%	-39.24%	-4.00%
Current Drawdown Current decline from peak	0.00%	-0.58%	+0.58%
Average Drawdown Average peak-to-trough decline	-8.50%	-6.26%	-2.24%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.17%	2.65%	-0.48%

Volatility

NAMAX vs. ACLAX - Volatility Comparison

Columbia Select Mid Cap Value Fund (NAMAX) has a higher volatility of 3.99% compared to American Century Mid Cap Value Fund A Class (ACLAX) at 2.94%. This indicates that NAMAX's price experiences larger fluctuations and is considered to be riskier than ACLAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NAMAX	ACLAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	3.99%	2.94%	+1.05%
Volatility (6M) Calculated over the trailing 6-month period	10.53%	8.51%	+2.02%
Volatility (1Y) Calculated over the trailing 1-year period	13.98%	11.90%	+2.08%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.13%	14.66%	+3.47%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.05%	17.48%	+2.57%

NAMAX vs. ACLAX - Expense Ratio Comparison

NAMAX has a 0.88% expense ratio, which is lower than ACLAX's 1.22% expense ratio.

Dividends

NAMAX vs. ACLAX - Dividend Comparison

NAMAX's dividend yield for the trailing twelve months is around 5.59%, less than ACLAX's 12.99% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
ACLAX American Century Mid Cap Value Fund A Class	12.99%	14.24%	8.53%	5.01%	14.77%	15.72%	1.62%	1.23%	14.17%	9.25%	3.82%	10.86%
NAMAX Columbia Select Mid Cap Value Fund	5.59%	6.71%	7.07%	0.74%	6.39%	8.99%	3.22%	3.38%	27.38%	21.08%	8.07%	17.05%

Frequently Asked Questions

Can I hold both NAMAX and ACLAX in my portfolio?

NAMAX and ACLAX have a correlation of 0.88, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NAMAX or ACLAX?

NAMAX has higher volatility (3.99%) compared to ACLAX (2.94%). In terms of maximum drawdown, NAMAX dropped -60.44% vs ACLAX's -51.37%.

Which has better risk-adjusted returns?

NAMAX currently has the higher Sharpe Ratio (2.64 vs 1.48), 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.