NSIDX vs. NOMIX

Last updated Jun 4, 2026

NSIDX (Northern Small Cap Index Fund) and NOMIX (Northern Mid Cap Index Fund) are both mutual funds - NSIDX is a Small Cap Blend Equities fund managed by Northern Funds, while NOMIX is a Mid Cap Blend Equities fund managed by Northern Funds. Over the past 10 years, NSIDX returned 10.98%/yr vs 11.12%/yr for NOMIX. With a 0.95 correlation, they move nearly in lockstep. Both charge a 0.10% expense ratio.

Performance

NSIDX vs. NOMIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Northern Small Cap Index Fund (NSIDX) and Northern Mid Cap Index Fund (NOMIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NSIDX achieves a 18.68% return, which is significantly higher than NOMIX's 14.18% return. Both investments have delivered pretty close results over the past 10 years, with NSIDX having a 10.98% annualized return and NOMIX not far ahead at 11.12%.

NSIDX

• 1D: 0.93%
• 1M: 4.97%
• YTD: 18.68%
• 6M: 17.43%
• 1Y: 41.27%
• 3Y*: 18.61%
• 5Y*: 6.47%
• 10Y*: 10.98%

NOMIX

• 1D: 0.89%
• 1M: 3.94%
• YTD: 14.18%
• 6M: 14.46%
• 1Y: 25.61%
• 3Y*: 16.01%
• 5Y*: 8.10%
• 10Y*: 11.12%

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

NSIDX vs. NOMIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NSIDX Northern Small Cap Index Fund	18.68%	12.88%	11.45%	16.87%	-20.63%	14.38%	19.59%	25.22%	-11.33%	14.62%
NOMIX Northern Mid Cap Index Fund	14.18%	7.45%	13.41%	16.43%	-13.42%	24.47%	13.59%	25.94%	-11.31%	16.06%

Correlation

The correlation between NSIDX and NOMIX 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	0.93
Correlation (5Y) Calculated over the trailing 5-year period	0.95
Correlation (10Y) Calculated over the trailing 10-year period	0.95
Correlation (All Time) Calculated using the full available price history since Mar 24, 2005	0.95

The correlation between NSIDX and NOMIX has been stable across timeframes, ranging from 0.91 to 0.95 - a consistent structural relationship.

Return for Risk

NSIDX vs. NOMIX — Risk / Return Rank

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

NSIDX

NSIDX Risk / Return Rank: 65
NSIDX Sharpe Ratio Rank: 58
NSIDX Sortino Ratio Rank: 56
NSIDX Omega Ratio Rank: 49
NSIDX Calmar Ratio Rank: 85
NSIDX Martin Ratio Rank: 75

NOMIX

NOMIX Risk / Return Rank: 45
NOMIX Sharpe Ratio Rank: 34
NOMIX Sortino Ratio Rank: 34
NOMIX Omega Ratio Rank: 35
NOMIX Calmar Ratio Rank: 66
NOMIX Martin Ratio Rank: 57

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.

NSIDX vs. NOMIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Northern Small Cap Index Fund (NSIDX) and Northern Mid Cap Index Fund (NOMIX). 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.

	NSIDX	NOMIX	Difference
Sharpe ratio Return per unit of total volatility	2.25	1.67	+0.57
Sortino ratio Return per unit of downside risk	3.15	2.43	+0.71
Omega ratio Gain probability vs. loss probability	1.38	1.31	+0.07
Calmar ratio Return relative to maximum drawdown	4.05	3.14	+0.91
Martin ratio Return relative to average drawdown	14.27	11.45	+2.81
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

NSIDX vs. NOMIX - Sharpe Ratio Comparison

The current NSIDX Sharpe Ratio is 2.25, which is higher than the NOMIX Sharpe Ratio of 1.67. The chart below compares the historical Sharpe Ratios of NSIDX and NOMIX, 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

	NSIDX	NOMIX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.25	1.67	+0.57
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.27	0.38	-0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.45	0.51	-0.06
Sharpe Ratio (All Time) Calculated using the full available price history	0.34	0.45	-0.11

Drawdowns

NSIDX vs. NOMIX - Drawdown Comparison

The maximum NSIDX drawdown since its inception was -59.02%, which is greater than NOMIX's maximum drawdown of -55.44%. Use the drawdown chart below to compare losses from any high point for NSIDX and NOMIX.

Drawdown Indicators

	NSIDX	NOMIX	Difference
Max Drawdown Largest peak-to-trough decline	-59.02%	-55.44%	-3.58%
Max Drawdown (1Y) Largest decline over 1 year	-10.97%	-8.84%	-2.13%
Max Drawdown (3Y) Largest decline over 3 years	-27.71%	-24.34%	-3.37%
Max Drawdown (5Y) Largest decline over 5 years	-32.89%	-27.65%	-5.24%
Max Drawdown (10Y) Largest decline over 10 years	-42.09%	-42.03%	-0.06%
Current Drawdown Current decline from peak	-0.11%	0.00%	-0.11%
Average Drawdown Average peak-to-trough decline	-12.06%	-7.92%	-4.14%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.09%	2.40%	+0.69%

Volatility

NSIDX vs. NOMIX - Volatility Comparison

Northern Small Cap Index Fund (NSIDX) has a higher volatility of 5.61% compared to Northern Mid Cap Index Fund (NOMIX) at 4.46%. This indicates that NSIDX's price experiences larger fluctuations and is considered to be riskier than NOMIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NSIDX	NOMIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.61%	4.46%	+1.15%
Volatility (6M) Calculated over the trailing 6-month period	13.67%	12.51%	+1.16%
Volatility (1Y) Calculated over the trailing 1-year period	19.77%	16.58%	+3.19%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	24.23%	21.29%	+2.94%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	24.26%	21.81%	+2.45%

NSIDX vs. NOMIX - Expense Ratio Comparison

Both NSIDX and NOMIX have an expense ratio of 0.10%, making them cost-effective options compared to the broader market, where average expense ratios typically range from 0.3% to 0.9%.

Dividends

NSIDX vs. NOMIX - Dividend Comparison

NSIDX's dividend yield for the trailing twelve months is around 1.33%, less than NOMIX's 6.07% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NOMIX Northern Mid Cap Index Fund	6.07%	6.93%	9.67%	8.01%	10.43%	10.30%	4.80%	2.21%	9.23%	7.46%	6.46%	8.25%
NSIDX Northern Small Cap Index Fund	1.33%	1.57%	6.72%	2.01%	6.38%	12.15%	3.52%	1.78%	12.16%	6.55%	4.06%	6.68%

Frequently Asked Questions

Can I hold both NSIDX and NOMIX in my portfolio?

With a correlation of 0.91, NSIDX and NOMIX 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, NSIDX or NOMIX?

NSIDX has higher volatility (5.61%) compared to NOMIX (4.46%). In terms of maximum drawdown, NSIDX dropped -59.02% vs NOMIX's -55.44%.

Which has better risk-adjusted returns?

NSIDX currently has the higher Sharpe Ratio (2.25 vs 1.67), 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.