NMPAX vs. COSZX

Last updated Jun 25, 2026

NMPAX (Columbia Mid Cap Index Fund) and COSZX (Columbia Overseas Value Fund) are both mutual funds - NMPAX is a Mid Cap Blend Equities fund managed by Columbia, while COSZX is a Foreign Large Cap Equities fund managed by Columbia. Over the past 10 years, NMPAX returned 10.51%/yr vs 10.36%/yr for COSZX. A 0.74 correlation means they provide meaningful diversification when combined. NMPAX charges 0.20%/yr vs 0.90%/yr for COSZX.

Performance

NMPAX vs. COSZX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Columbia Mid Cap Index Fund (NMPAX) and Columbia Overseas Value Fund (COSZX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NMPAX achieves a 9.73% return, which is significantly higher than COSZX's -0.35% return. Both investments have delivered pretty close results over the past 10 years, with NMPAX having a 10.51% annualized return and COSZX not far behind at 10.36%.

NMPAX

• 1D: -1.02%
• 1M: -1.70%
• YTD: 9.73%
• 6M: 7.60%
• 1Y: 18.56%
• 3Y*: 14.28%
• 5Y*: 7.42%
• 10Y*: 10.51%

COSZX

• 1D: -1.46%
• 1M: -7.33%
• YTD: -0.35%
• 6M: -0.98%
• 1Y: 16.58%
• 3Y*: 18.74%
• 5Y*: 10.42%
• 10Y*: 10.36%

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

NMPAX vs. COSZX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NMPAX Columbia Mid Cap Index Fund	9.73%	7.23%	13.67%	16.32%	-13.27%	24.66%	8.71%	25.99%	-11.44%	15.84%
COSZX Columbia Overseas Value Fund	-0.35%	45.80%	4.70%	16.05%	-5.99%	10.78%	-0.07%	22.37%	-16.70%	27.82%

Correlation

The correlation between NMPAX and COSZX is 0.64, 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	0.64
Correlation (3Y) Calculated over the trailing 3-year period	0.64
Correlation (5Y) Calculated over the trailing 5-year period	0.70
Correlation (10Y) Calculated over the trailing 10-year period	0.71
Correlation (All Time) Calculated using the full available price history since Apr 1, 2008	0.74

The correlation between NMPAX and COSZX has been stable across timeframes, ranging from 0.64 to 0.74 - a consistent structural relationship.

Return for Risk

NMPAX vs. COSZX — Risk / Return Rank

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

NMPAX

NMPAX Risk / Return Rank: 32
NMPAX Sharpe Ratio Rank: 25
NMPAX Sortino Ratio Rank: 26
NMPAX Omega Ratio Rank: 25
NMPAX Calmar Ratio Rank: 43
NMPAX Martin Ratio Rank: 43

COSZX

COSZX Risk / Return Rank: 22
COSZX Sharpe Ratio Rank: 22
COSZX Sortino Ratio Rank: 20
COSZX Omega Ratio Rank: 24
COSZX Calmar Ratio Rank: 21
COSZX Martin Ratio Rank: 22

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.

NMPAX vs. COSZX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Columbia Mid Cap Index Fund (NMPAX) and Columbia Overseas Value Fund (COSZX). 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.

	NMPAX	COSZX	Difference
Sharpe ratio: Return per unit of total volatility	1.21	1.21	0.00
Sortino ratio: Return per unit of downside risk	1.78	1.68	+0.10
Omega ratio: Gain probability vs. loss probability	1.22	1.23	-0.01
Calmar ratio: Return relative to maximum drawdown	2.23	1.53	+0.70
Martin ratio: Return relative to average drawdown	8.03	4.85	+3.18

NMPAX vs. COSZX - Sharpe Ratio Comparison

The current NMPAX Sharpe Ratio is 1.21, which is comparable to the COSZX Sharpe Ratio of 1.21. The chart below compares the historical Sharpe Ratios of NMPAX and COSZX, 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

NMPAX vs. COSZX - Drawdown Comparison

The maximum NMPAX drawdown since its inception was -54.31%, smaller than the maximum COSZX drawdown of -63.37%. Use the drawdown chart below to compare losses from any high point for NMPAX and COSZX.

Drawdown Indicators

	NMPAX	COSZX	Difference
Max Drawdown Largest peak-to-trough decline	-54.31%	-63.37%	+9.06%
Max Drawdown (1Y) Largest decline over 1 year	-8.84%	-11.76%	+2.92%
Max Drawdown (3Y) Largest decline over 3 years	-24.03%	-13.34%	-10.69%
Max Drawdown (5Y) Largest decline over 5 years	-24.03%	-25.77%	+1.74%
Max Drawdown (10Y) Largest decline over 10 years	-42.09%	-43.40%	+1.31%
Current Drawdown Current decline from peak	-5.23%	-11.45%	+6.22%
Average Drawdown Average peak-to-trough decline	-7.71%	-17.86%	+10.15%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.45%	3.70%	-1.25%

Volatility

NMPAX vs. COSZX - Volatility Comparison

Columbia Mid Cap Index Fund (NMPAX) and Columbia Overseas Value Fund (COSZX) have volatilities of 6.26% and 6.27%, 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

	NMPAX	COSZX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.26%	6.27%	-0.01%
Volatility (6M) Calculated over the trailing 6-month period	12.46%	12.45%	+0.01%
Volatility (1Y) Calculated over the trailing 1-year period	16.34%	14.90%	+1.44%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.81%	16.02%	+3.79%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.15%	17.19%	+3.96%

NMPAX vs. COSZX - Expense Ratio Comparison

NMPAX has a 0.20% expense ratio, which is lower than COSZX's 0.90% expense ratio.

Dividends

NMPAX vs. COSZX - Dividend Comparison

NMPAX's dividend yield for the trailing twelve months is around 5.96%, less than COSZX's 7.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
COSZX Columbia Overseas Value Fund	7.94%	7.91%	5.38%	3.97%	1.88%	3.59%	1.69%	3.82%	3.59%	1.71%	1.99%	2.27%
NMPAX Columbia Mid Cap Index Fund	5.96%	9.34%	11.35%	7.97%	11.65%	18.03%	5.96%	5.70%	10.06%	7.66%	7.97%	10.12%

Frequently Asked Questions

Can I hold both NMPAX and COSZX in my portfolio?

NMPAX and COSZX have a correlation of 0.64, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NMPAX or COSZX?

COSZX has higher volatility (6.27%) compared to NMPAX (6.26%). In terms of maximum drawdown, NMPAX dropped -54.31% vs COSZX's -63.37%.

Which has better risk-adjusted returns?

NMPAX currently has the higher Sharpe Ratio (1.21 vs 1.21), 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.