NSGRX vs. NSIDX

Last updated Jun 24, 2026

NSGRX (Northern Small Cap Core Fund) and NSIDX (Northern Small Cap Index Fund) are both Small Cap Blend Equities funds from Northern Funds. Over the past 10 years, NSGRX returned 11.58%/yr vs 11.61%/yr for NSIDX. With a 0.97 correlation, they move nearly in lockstep. NSGRX charges 0.62%/yr vs 0.10%/yr for NSIDX.

Performance

NSGRX vs. NSIDX - Performance Comparison

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

Returns By Period

In the year-to-date period, NSGRX achieves a 20.56% return, which is significantly lower than NSIDX's 21.65% return. Both investments have delivered pretty close results over the past 10 years, with NSGRX having a 11.58% annualized return and NSIDX not far ahead at 11.61%.

NSGRX

• 1D: 0.87%
• 1M: 4.82%
• YTD: 20.56%
• 6M: 18.41%
• 1Y: 38.28%
• 3Y*: 18.50%
• 5Y*: 8.06%
• 10Y*: 11.58%

NSIDX

• 1D: 0.80%
• 1M: 4.79%
• YTD: 21.65%
• 6M: 18.89%
• 1Y: 42.65%
• 3Y*: 19.76%
• 5Y*: 6.76%
• 10Y*: 11.61%

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

NSGRX vs. NSIDX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NSGRX Northern Small Cap Core Fund	20.56%	10.57%	10.44%	16.96%	-16.14%	19.99%	14.53%	23.30%	-10.22%	13.05%
NSIDX Northern Small Cap Index Fund	21.65%	12.88%	11.45%	16.87%	-20.63%	14.38%	19.59%	25.22%	-11.33%	14.62%

Correlation

The correlation between NSGRX and NSIDX is 0.97 - these two move nearly in lockstep. At this level, holding both provides almost no diversification benefit. If you already own one, adding the other does little to reduce portfolio risk.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.97
Correlation (3Y) Calculated over the trailing 3-year period	0.98
Correlation (5Y) Calculated over the trailing 5-year period	0.99
Correlation (10Y) Calculated over the trailing 10-year period	0.99
Correlation (All Time) Calculated using the full available price history since Sep 30, 1999	0.97

The correlation between NSGRX and NSIDX has been stable across timeframes, ranging from 0.97 to 0.99 - a consistent structural relationship.

Return for Risk

NSGRX vs. NSIDX — Risk / Return Rank

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

NSGRX

NSGRX Risk / Return Rank: 74
NSGRX Sharpe Ratio Rank: 66
NSGRX Sortino Ratio Rank: 66
NSGRX Omega Ratio Rank: 56
NSGRX Calmar Ratio Rank: 92
NSGRX Martin Ratio Rank: 90

NSIDX

NSIDX Risk / Return Rank: 71
NSIDX Sharpe Ratio Rank: 67
NSIDX Sortino Ratio Rank: 64
NSIDX Omega Ratio Rank: 54
NSIDX Calmar Ratio Rank: 88
NSIDX Martin Ratio Rank: 83

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.

NSGRX vs. NSIDX - Risk-Adjusted Trends Comparison

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

	NSGRX	NSIDX	Difference
Sharpe ratio: Return per unit of total volatility	2.19	2.20	-0.02
Sortino ratio: Return per unit of downside risk	3.09	3.06	+0.03
Omega ratio: Gain probability vs. loss probability	1.38	1.37	+0.01
Calmar ratio: Return relative to maximum drawdown	4.67	4.07	+0.60
Martin ratio: Return relative to average drawdown	16.35	14.33	+2.02

NSGRX vs. NSIDX - Sharpe Ratio Comparison

The current NSGRX Sharpe Ratio is 2.19, which is comparable to the NSIDX Sharpe Ratio of 2.20. The chart below compares the historical Sharpe Ratios of NSGRX and NSIDX, 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

NSGRX vs. NSIDX - Drawdown Comparison

The maximum NSGRX drawdown since its inception was -64.89%, which is greater than NSIDX's maximum drawdown of -59.02%. Use the drawdown chart below to compare losses from any high point for NSGRX and NSIDX.

Drawdown Indicators

	NSGRX	NSIDX	Difference
Max Drawdown Largest peak-to-trough decline	-64.89%	-59.02%	-5.87%
Max Drawdown (1Y) Largest decline over 1 year	-8.66%	-10.97%	+2.31%
Max Drawdown (3Y) Largest decline over 3 years	-26.45%	-27.71%	+1.26%
Max Drawdown (5Y) Largest decline over 5 years	-32.31%	-32.89%	+0.58%
Max Drawdown (10Y) Largest decline over 10 years	-40.37%	-42.09%	+1.72%
Current Drawdown Current decline from peak	0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-22.13%	-12.04%	-10.09%
Ulcer Index Depth and duration of drawdowns from previous peaks	2.46%	3.10%	-0.64%

Volatility

NSGRX vs. NSIDX - Volatility Comparison

The current volatility for Northern Small Cap Core Fund (NSGRX) is 5.51%, while Northern Small Cap Index Fund (NSIDX) has a volatility of 6.40%. This indicates that NSGRX experiences smaller price fluctuations and is considered to be less risky than NSIDX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NSGRX	NSIDX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.51%	6.40%	-0.89%
Volatility (6M) Calculated over the trailing 6-month period	13.07%	14.44%	-1.37%
Volatility (1Y) Calculated over the trailing 1-year period	18.56%	20.33%	-1.77%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.41%	24.31%	-0.90%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.42%	24.31%	-0.89%

NSGRX vs. NSIDX - Expense Ratio Comparison

NSGRX has a 0.62% expense ratio, which is higher than NSIDX's 0.10% expense ratio.

Dividends

NSGRX vs. NSIDX - Dividend Comparison

NSGRX's dividend yield for the trailing twelve months is around 13.15%, more than NSIDX's 1.29% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NSGRX Northern Small Cap Core Fund	13.15%	15.85%	17.77%	6.90%	0.55%	15.75%	5.00%	6.30%	1.26%	4.35%	0.67%	3.35%
NSIDX Northern Small Cap Index Fund	1.29%	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 NSGRX and NSIDX in my portfolio?

With a correlation of 0.97, NSGRX and NSIDX 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, NSGRX or NSIDX?

NSIDX has higher volatility (6.40%) compared to NSGRX (5.51%). In terms of maximum drawdown, NSGRX dropped -64.89% vs NSIDX's -59.02%.

Which has better risk-adjusted returns?

NSIDX currently has the higher Sharpe Ratio (2.20 vs 2.19), 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.