NMPAX vs. FIIAX

Last updated Jun 25, 2026

NMPAX (Columbia Mid Cap Index Fund) and FIIAX (Fidelity Advisor Mid Cap II Fund Class A) are both Mid Cap Blend Equities funds. Over the past 10 years, NMPAX returned 10.51%/yr vs 12.72%/yr for FIIAX. With a 0.95 correlation, they move nearly in lockstep. NMPAX charges 0.20%/yr vs 1.00%/yr for FIIAX.

Performance

NMPAX vs. FIIAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Columbia Mid Cap Index Fund (NMPAX) and Fidelity Advisor Mid Cap II Fund Class A (FIIAX). 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 lower than FIIAX's 24.12% return. Over the past 10 years, NMPAX has underperformed FIIAX with an annualized return of 10.51%, while FIIAX has yielded a comparatively higher 12.72% annualized return.

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%

FIIAX

• 1D: -1.37%
• 1M: 5.30%
• YTD: 24.12%
• 6M: 21.32%
• 1Y: 38.76%
• 3Y*: 19.78%
• 5Y*: 10.44%
• 10Y*: 12.72%

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

NMPAX vs. FIIAX - 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%
FIIAX Fidelity Advisor Mid Cap II Fund Class A	24.12%	7.21%	16.96%	14.68%	-15.04%	24.94%	18.34%	23.32%	-15.21%	20.32%

Correlation

The correlation between NMPAX and FIIAX is 0.94, 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	0.94
Correlation (3Y) Calculated over the trailing 3-year period	0.96
Correlation (5Y) Calculated over the trailing 5-year period	0.97
Correlation (10Y) Calculated over the trailing 10-year period	0.97
Correlation (All Time) Calculated using the full available price history since Aug 16, 2004	0.95

The correlation between NMPAX and FIIAX has been stable across timeframes, ranging from 0.94 to 0.97 - a consistent structural relationship.

Return for Risk

NMPAX vs. FIIAX — 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

FIIAX

FIIAX Risk / Return Rank: 77
FIIAX Sharpe Ratio Rank: 74
FIIAX Sortino Ratio Rank: 69
FIIAX Omega Ratio Rank: 64
FIIAX Calmar Ratio Rank: 89
FIIAX Martin Ratio Rank: 90

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. FIIAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Columbia Mid Cap Index Fund (NMPAX) and Fidelity Advisor Mid Cap II Fund Class A (FIIAX). 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	FIIAX	Difference
Sharpe ratio: Return per unit of total volatility	1.21	2.26	-1.05
Sortino ratio: Return per unit of downside risk	1.78	3.07	-1.29
Omega ratio: Gain probability vs. loss probability	1.22	1.39	-0.17
Calmar ratio: Return relative to maximum drawdown	2.23	4.08	-1.84
Martin ratio: Return relative to average drawdown	8.03	16.30	-8.27

NMPAX vs. FIIAX - Sharpe Ratio Comparison

The current NMPAX Sharpe Ratio is 1.21, which is lower than the FIIAX Sharpe Ratio of 2.26. The chart below compares the historical Sharpe Ratios of NMPAX and FIIAX, 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. FIIAX - Drawdown Comparison

The maximum NMPAX drawdown since its inception was -54.31%, roughly equal to the maximum FIIAX drawdown of -53.35%. Use the drawdown chart below to compare losses from any high point for NMPAX and FIIAX.

Drawdown Indicators

	NMPAX	FIIAX	Difference
Max Drawdown Largest peak-to-trough decline	-54.31%	-53.35%	-0.96%
Max Drawdown (1Y) Largest decline over 1 year	-8.84%	-9.83%	+0.99%
Max Drawdown (3Y) Largest decline over 3 years	-24.03%	-28.25%	+4.22%
Max Drawdown (5Y) Largest decline over 5 years	-24.03%	-28.25%	+4.22%
Max Drawdown (10Y) Largest decline over 10 years	-42.09%	-42.33%	+0.24%
Current Drawdown Current decline from peak	-5.23%	-1.37%	-3.86%
Average Drawdown Average peak-to-trough decline	-7.71%	-8.18%	+0.47%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.45%	2.45%	0.00%

Volatility

NMPAX vs. FIIAX - Volatility Comparison

Columbia Mid Cap Index Fund (NMPAX) has a higher volatility of 6.26% compared to Fidelity Advisor Mid Cap II Fund Class A (FIIAX) at 5.88%. This indicates that NMPAX's price experiences larger fluctuations and is considered to be riskier than FIIAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NMPAX	FIIAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	6.26%	5.88%	+0.38%
Volatility (6M) Calculated over the trailing 6-month period	12.46%	14.29%	-1.83%
Volatility (1Y) Calculated over the trailing 1-year period	16.34%	17.78%	-1.44%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.81%	20.41%	-0.60%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.15%	21.02%	+0.13%

NMPAX vs. FIIAX - Expense Ratio Comparison

NMPAX has a 0.20% expense ratio, which is lower than FIIAX's 1.00% expense ratio.

Dividends

NMPAX vs. FIIAX - Dividend Comparison

NMPAX's dividend yield for the trailing twelve months is around 5.96%, more than FIIAX's 5.69% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FIIAX Fidelity Advisor Mid Cap II Fund Class A	5.69%	6.21%	6.89%	2.59%	5.68%	18.94%	1.12%	3.21%	10.53%	7.60%	8.69%	4.74%
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 FIIAX in my portfolio?

With a correlation of 0.94, NMPAX and FIIAX 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, NMPAX or FIIAX?

NMPAX has higher volatility (6.26%) compared to FIIAX (5.88%). In terms of maximum drawdown, NMPAX dropped -54.31% vs FIIAX's -53.35%.

Which has better risk-adjusted returns?

FIIAX currently has the higher Sharpe Ratio (2.26 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.