FZFLX vs. NMPAX

Last updated Jun 3, 2026

FZFLX (Fidelity SAI Small-Mid Cap 500 Index Fund) and NMPAX (Columbia Mid Cap Index Fund) are both Mid Cap Blend Equities funds. Over the past 10 years, FZFLX returned 13.89%/yr vs 10.51%/yr for NMPAX. With a 0.97 correlation, they move nearly in lockstep. FZFLX charges 0.05%/yr vs 0.20%/yr for NMPAX.

Performance

FZFLX vs. NMPAX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Fidelity SAI Small-Mid Cap 500 Index Fund (FZFLX) and Columbia Mid Cap Index Fund (NMPAX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, FZFLX achieves a 31.03% return, which is significantly higher than NMPAX's 13.11% return. Over the past 10 years, FZFLX has outperformed NMPAX with an annualized return of 13.89%, while NMPAX has yielded a comparatively lower 10.51% annualized return.

FZFLX

• 1D: -0.68%
• 1M: 4.45%
• YTD: 31.03%
• 6M: 32.60%
• 1Y: 48.15%
• 3Y*: 23.77%
• 5Y*: 11.54%
• 10Y*: 13.89%

NMPAX

• 1D: -0.06%
• 1M: 2.36%
• YTD: 13.11%
• 6M: 14.13%
• 1Y: 25.79%
• 3Y*: 15.61%
• 5Y*: 7.86%
• 10Y*: 10.51%

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

FZFLX vs. NMPAX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
FZFLX Fidelity SAI Small-Mid Cap 500 Index Fund	31.03%	10.76%	15.52%	17.75%	-15.62%	20.40%	19.78%	31.96%	-9.25%	18.41%
NMPAX Columbia Mid Cap Index Fund	13.11%	7.23%	13.67%	16.32%	-13.27%	24.66%	8.71%	25.99%	-11.44%	15.84%

Correlation

The correlation between FZFLX and NMPAX is 0.91, 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	0.91
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 21, 2015	0.97

The correlation between FZFLX and NMPAX has been stable across timeframes, ranging from 0.91 to 0.97 - a consistent structural relationship.

Return for Risk

FZFLX vs. NMPAX — Risk / Return Rank

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

FZFLX

FZFLX Risk / Return Rank: 70
FZFLX Sharpe Ratio Rank: 62
FZFLX Sortino Ratio Rank: 54
FZFLX Omega Ratio Rank: 53
FZFLX Calmar Ratio Rank: 89
FZFLX Martin Ratio Rank: 91

NMPAX

NMPAX Risk / Return Rank: 41
NMPAX Sharpe Ratio Rank: 33
NMPAX Sortino Ratio Rank: 34
NMPAX Omega Ratio Rank: 31
NMPAX Calmar Ratio Rank: 55
NMPAX Martin Ratio Rank: 51

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.

FZFLX vs. NMPAX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Fidelity SAI Small-Mid Cap 500 Index Fund (FZFLX) and Columbia Mid Cap Index Fund (NMPAX). 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.

	FZFLX	NMPAX	Difference
Sharpe ratio Return per unit of total volatility	2.33	1.66	+0.67
Sortino ratio Return per unit of downside risk	3.09	2.42	+0.67
Omega ratio Gain probability vs. loss probability	1.41	1.29	+0.11
Calmar ratio Return relative to maximum drawdown	4.49	2.84	+1.65
Martin ratio Return relative to average drawdown	19.03	10.39	+8.64
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

FZFLX vs. NMPAX - Sharpe Ratio Comparison

The current FZFLX Sharpe Ratio is 2.33, which is higher than the NMPAX Sharpe Ratio of 1.66. The chart below compares the historical Sharpe Ratios of FZFLX and NMPAX, 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

	FZFLX	NMPAX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.33	1.66	+0.67
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.55	0.40	+0.15
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.66	0.50	+0.16
Sharpe Ratio (All Time) Calculated using the full available price history	0.62	0.44	+0.19

Drawdowns

FZFLX vs. NMPAX - Drawdown Comparison

The maximum FZFLX drawdown since its inception was -42.03%, smaller than the maximum NMPAX drawdown of -54.31%. Use the drawdown chart below to compare losses from any high point for FZFLX and NMPAX.

Drawdown Indicators

	FZFLX	NMPAX	Difference
Max Drawdown Largest peak-to-trough decline	-42.03%	-54.31%	+12.28%
Max Drawdown (1Y) Largest decline over 1 year	-10.68%	-8.84%	-1.84%
Max Drawdown (3Y) Largest decline over 3 years	-22.29%	-24.03%	+1.74%
Max Drawdown (5Y) Largest decline over 5 years	-24.77%	-24.03%	-0.74%
Max Drawdown (10Y) Largest decline over 10 years	-42.03%	-42.09%	+0.06%
Current Drawdown Current decline from peak	-1.84%	-0.12%	-1.72%
Average Drawdown Average peak-to-trough decline	-5.74%	-7.73%	+1.99%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.52%	2.41%	+0.11%

Volatility

FZFLX vs. NMPAX - Volatility Comparison

Fidelity SAI Small-Mid Cap 500 Index Fund (FZFLX) has a higher volatility of 7.30% compared to Columbia Mid Cap Index Fund (NMPAX) at 4.39%. This indicates that FZFLX's price experiences larger fluctuations and is considered to be riskier than NMPAX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	FZFLX	NMPAX	Difference
Volatility (1M) Calculated over the trailing 1-month period	7.30%	4.39%	+2.91%
Volatility (6M) Calculated over the trailing 6-month period	17.66%	11.35%	+6.31%
Volatility (1Y) Calculated over the trailing 1-year period	20.84%	15.52%	+5.32%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	21.10%	19.71%	+1.39%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	21.10%	21.12%	-0.02%

FZFLX vs. NMPAX - Expense Ratio Comparison

FZFLX has a 0.05% expense ratio, which is lower than NMPAX's 0.20% expense ratio. Despite the difference, both funds are considered low-cost compared to the broader market, where average expense ratios usually range from 0.3% to 0.9%.

Dividends

FZFLX vs. NMPAX - Dividend Comparison

FZFLX's dividend yield for the trailing twelve months is around 44.09%, more than NMPAX's 8.26% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
FZFLX Fidelity SAI Small-Mid Cap 500 Index Fund	44.09%	57.77%	10.20%	2.35%	79.79%	50.77%	7.19%	6.49%	7.69%	1.68%	0.93%	0.67%
NMPAX Columbia Mid Cap Index Fund	8.26%	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 FZFLX and NMPAX in my portfolio?

With a correlation of 0.91, FZFLX and NMPAX 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, FZFLX or NMPAX?

FZFLX has higher volatility (7.30%) compared to NMPAX (4.39%). In terms of maximum drawdown, FZFLX dropped -42.03% vs NMPAX's -54.31%.

Which has better risk-adjusted returns?

FZFLX currently has the higher Sharpe Ratio (2.33 vs 1.66), 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.