PMDIX vs. NAMAX

Last updated Jun 19, 2026

PMDIX (Principal Small-MidCap Dividend Income Fund) and NAMAX (Columbia Select Mid Cap Value Fund) are both Mid Cap Value Equities funds. Over the past 10 years, PMDIX returned 10.21%/yr vs 11.43%/yr for NAMAX. Their correlation of 0.93 suggests significant overlap in exposure. PMDIX charges 0.85%/yr vs 0.88%/yr for NAMAX.

Performance

PMDIX vs. NAMAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Principal Small-MidCap Dividend Income Fund (PMDIX) and Columbia Select Mid Cap Value Fund (NAMAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, PMDIX achieves a 15.06% return, which is significantly lower than NAMAX's 21.24% return. Over the past 10 years, PMDIX has underperformed NAMAX with an annualized return of 10.21%, while NAMAX has yielded a comparatively higher 11.43% annualized return.

PMDIX

• 1D: -1.04%
• 1M: 5.82%
• YTD: 15.06%
• 6M: 14.53%
• 1Y: 26.68%
• 3Y*: 16.69%
• 5Y*: 11.20%
• 10Y*: 10.21%

NAMAX

• 1D: -0.60%
• 1M: 6.01%
• YTD: 21.24%
• 6M: 21.40%
• 1Y: 38.01%
• 3Y*: 18.65%
• 5Y*: 11.81%
• 10Y*: 11.43%

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

PMDIX vs. NAMAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
PMDIX Principal Small-MidCap Dividend Income Fund	15.06%	8.63%	14.56%	18.81%	-11.66%	30.41%	-6.40%	25.38%	-13.80%	13.30%
NAMAX Columbia Select Mid Cap Value Fund	21.24%	13.77%	13.14%	9.65%	-9.33%	32.28%	6.90%	31.56%	-18.46%	13.71%

Correlation

The correlation between PMDIX and NAMAX is 0.90, 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	0.90
Correlation (3Y) Calculated over the trailing 3-year period	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.94
Correlation (10Y) Calculated over the trailing 10-year period	0.93
Correlation (All Time) Calculated using the full available price history since Jun 7, 2011	0.93

The correlation between PMDIX and NAMAX has been stable across timeframes, ranging from 0.90 to 0.94 - a consistent structural relationship.

Return for Risk

PMDIX vs. NAMAX — Risk / Return Rank

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

PMDIX

PMDIX Risk / Return Rank: 49
PMDIX Sharpe Ratio Rank: 47
PMDIX Sortino Ratio Rank: 53
PMDIX Omega Ratio Rank: 43
PMDIX Calmar Ratio Rank: 52
PMDIX Martin Ratio Rank: 50

NAMAX

NAMAX Risk / Return Rank: 85
NAMAX Sharpe Ratio Rank: 86
NAMAX Sortino Ratio Rank: 83
NAMAX Omega Ratio Rank: 75
NAMAX Calmar Ratio Rank: 90
NAMAX Martin Ratio Rank: 91

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.

PMDIX vs. NAMAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Principal Small-MidCap Dividend Income Fund (PMDIX) and Columbia Select Mid Cap Value Fund (NAMAX). 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.

	PMDIX	NAMAX	Difference
Sharpe ratio: Return per unit of total volatility	1.83	2.60	-0.78
Sortino ratio: Return per unit of downside risk	2.75	3.65	-0.90
Omega ratio: Gain probability vs. loss probability	1.32	1.45	-0.13
Calmar ratio: Return relative to maximum drawdown	2.59	4.35	-1.76
Martin ratio: Return relative to average drawdown	9.50	17.00	-7.49

PMDIX vs. NAMAX - Sharpe Ratio Comparison

The current PMDIX Sharpe Ratio is 1.83, which is comparable to the NAMAX Sharpe Ratio of 2.60. The chart below compares the historical Sharpe Ratios of PMDIX and NAMAX, 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

PMDIX vs. NAMAX - Drawdown Comparison

The maximum PMDIX drawdown since its inception was -46.47%, smaller than the maximum NAMAX drawdown of -60.44%. Use the drawdown chart below to compare losses from any high point for PMDIX and NAMAX.

Drawdown Indicators

	PMDIX	NAMAX	Difference
Max Drawdown Largest peak-to-trough decline	-46.47%	-60.44%	+13.97%
Max Drawdown (1Y) Largest decline over 1 year	-10.55%	-8.49%	-2.06%
Max Drawdown (3Y) Largest decline over 3 years	-21.36%	-20.90%	-0.46%
Max Drawdown (5Y) Largest decline over 5 years	-21.36%	-20.90%	-0.46%
Max Drawdown (10Y) Largest decline over 10 years	-46.47%	-43.24%	-3.23%
Current Drawdown Current decline from peak	-1.04%	-0.60%	-0.44%
Average Drawdown Average peak-to-trough decline	-5.28%	-8.49%	+3.21%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.87%	2.17%	+0.70%

Volatility

PMDIX vs. NAMAX - Volatility Comparison

Principal Small-MidCap Dividend Income Fund (PMDIX) and Columbia Select Mid Cap Value Fund (NAMAX) have volatilities of 4.60% and 4.40%, respectively, indicating that both stocks experience similar levels of price fluctuations. This suggests that the risk associated with both stocks, as measured by volatility, is nearly the same. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	PMDIX	NAMAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	4.60%	4.40%	+0.20%
Volatility (6M) Calculated over the trailing 6-month period	11.09%	10.71%	+0.38%
Volatility (1Y) Calculated over the trailing 1-year period	14.99%	14.21%	+0.78%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	18.81%	18.17%	+0.64%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	20.28%	20.08%	+0.20%

PMDIX vs. NAMAX - Expense Ratio Comparison

PMDIX has a 0.85% expense ratio, which is lower than NAMAX's 0.88% expense ratio.

Dividends

PMDIX vs. NAMAX - Dividend Comparison

PMDIX's dividend yield for the trailing twelve months is around 2.74%, less than NAMAX's 6.15% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NAMAX Columbia Select Mid Cap Value Fund	6.15%	6.71%	7.07%	0.74%	6.39%	8.99%	3.22%	3.38%	27.38%	21.08%	8.07%	17.05%
PMDIX Principal Small-MidCap Dividend Income Fund	2.74%	3.14%	7.99%	2.37%	6.95%	0.98%	1.37%	2.82%	17.83%	5.77%	2.84%	4.78%

Frequently Asked Questions

Can I hold both PMDIX and NAMAX in my portfolio?

With a correlation of 0.90, PMDIX and NAMAX move almost identically. Holding both adds very little diversification - you're essentially doubling your position in the same market segment. Choosing one is usually more capital-efficient.

Which is riskier, PMDIX or NAMAX?

PMDIX has higher volatility (4.60%) compared to NAMAX (4.40%). In terms of maximum drawdown, PMDIX dropped -46.47% vs NAMAX's -60.44%.

Which has better risk-adjusted returns?

NAMAX currently has the higher Sharpe Ratio (2.60 vs 1.83), 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.