NESIX vs. VSGIX

Last updated Jun 24, 2026

NESIX (Needham Small Cap Growth Fund Institutional) and VSGIX (Vanguard Small-Cap Growth Index Fund Institutional Shares) are both Small Cap Growth Equities funds. Over the past 5 years, NESIX returned 10.38%/yr vs 5.13%/yr for VSGIX. Their correlation of 0.85 suggests significant overlap in exposure. NESIX charges 1.18%/yr vs 0.06%/yr for VSGIX.

Performance

NESIX vs. VSGIX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in Needham Small Cap Growth Fund Institutional (NESIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, NESIX achieves a 83.93% return, which is significantly higher than VSGIX's 18.75% return.

NESIX

• 1D: -0.37%
• 1M: 10.56%
• YTD: 83.93%
• 6M: 79.27%
• 1Y: 122.28%
• 3Y*: 35.08%
• 5Y*: 10.38%
• 10Y*: —

VSGIX

• 1D: 0.31%
• 1M: 3.11%
• YTD: 18.75%
• 6M: 15.73%
• 1Y: 32.50%
• 3Y*: 18.22%
• 5Y*: 5.13%
• 10Y*: 12.21%

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

NESIX vs. VSGIX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
NESIX Needham Small Cap Growth Fund Institutional	83.93%	11.16%	13.47%	5.85%	-29.71%	11.36%	73.06%	55.28%	-4.87%	12.63%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	18.75%	8.44%	14.95%	23.07%	-28.39%	5.70%	35.29%	32.77%	-5.70%	21.94%

Correlation

The correlation between NESIX and VSGIX is 0.85, 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	0.86
Correlation (3Y) Calculated over the trailing 3-year period	0.86
Correlation (5Y) Calculated over the trailing 5-year period	0.88
Correlation (All Time) Calculated using the full available price history since Jan 3, 2017	0.85

The correlation between NESIX and VSGIX has been stable across timeframes, ranging from 0.85 to 0.88 - a consistent structural relationship.

Return for Risk

NESIX vs. VSGIX — Risk / Return Rank

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

NESIX

NESIX Risk / Return Rank: 95
NESIX Sharpe Ratio Rank: 99
NESIX Sortino Ratio Rank: 93
NESIX Omega Ratio Rank: 88
NESIX Calmar Ratio Rank: 98
NESIX Martin Ratio Rank: 98

VSGIX

VSGIX Risk / Return Rank: 45
VSGIX Sharpe Ratio Rank: 38
VSGIX Sortino Ratio Rank: 35
VSGIX Omega Ratio Rank: 32
VSGIX Calmar Ratio Rank: 64
VSGIX Martin Ratio Rank: 58

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.

NESIX vs. VSGIX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Needham Small Cap Growth Fund Institutional (NESIX) and Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX). 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.

	NESIX	VSGIX	Difference
Sharpe ratio: Return per unit of total volatility	4.03	1.65	+2.38
Sortino ratio: Return per unit of downside risk	4.36	2.29	+2.07
Omega ratio: Gain probability vs. loss probability	1.57	1.28	+0.29
Calmar ratio: Return relative to maximum drawdown	7.37	2.94	+4.42
Martin ratio: Return relative to average drawdown	30.02	11.01	+19.01

NESIX vs. VSGIX - Sharpe Ratio Comparison

The current NESIX Sharpe Ratio is 4.03, which is higher than the VSGIX Sharpe Ratio of 1.65. The chart below compares the historical Sharpe Ratios of NESIX and VSGIX, 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

NESIX vs. VSGIX - Drawdown Comparison

The maximum NESIX drawdown since its inception was -49.61%, smaller than the maximum VSGIX drawdown of -58.66%. Use the drawdown chart below to compare losses from any high point for NESIX and VSGIX.

Drawdown Indicators

	NESIX	VSGIX	Difference
Max Drawdown Largest peak-to-trough decline	-49.61%	-58.66%	+9.05%
Max Drawdown (1Y) Largest decline over 1 year	-17.12%	-11.38%	-5.74%
Max Drawdown (3Y) Largest decline over 3 years	-35.21%	-27.47%	-7.74%
Max Drawdown (5Y) Largest decline over 5 years	-49.61%	-38.36%	-11.25%
Max Drawdown (10Y) Largest decline over 10 years	—	-38.70%	—
Current Drawdown Current decline from peak	-0.37%	0.00%	-0.37%
Average Drawdown Average peak-to-trough decline	-14.92%	-11.32%	-3.60%
Ulcer Index Depth and duration of drawdowns from previous peaks	4.19%	3.04%	+1.15%

Volatility

NESIX vs. VSGIX - Volatility Comparison

Needham Small Cap Growth Fund Institutional (NESIX) has a higher volatility of 11.97% compared to Vanguard Small-Cap Growth Index Fund Institutional Shares (VSGIX) at 6.94%. This indicates that NESIX's price experiences larger fluctuations and is considered to be riskier than VSGIX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	NESIX	VSGIX	Difference
Volatility (1M) Calculated over the trailing 1-month period	11.97%	6.94%	+5.03%
Volatility (6M) Calculated over the trailing 6-month period	22.24%	15.80%	+6.44%
Volatility (1Y) Calculated over the trailing 1-year period	31.35%	20.32%	+11.03%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	29.59%	23.70%	+5.89%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.56%	23.06%	+3.50%

NESIX vs. VSGIX - Expense Ratio Comparison

NESIX has a 1.18% expense ratio, which is higher than VSGIX's 0.06% expense ratio.

Dividends

NESIX vs. VSGIX - Dividend Comparison

NESIX has not paid dividends to shareholders, while VSGIX's dividend yield for the trailing twelve months is around 0.45%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
NESIX Needham Small Cap Growth Fund Institutional	0.00%	0.00%	0.00%	0.00%	3.93%	23.92%	13.26%	8.25%	21.96%	8.89%	0.00%	0.00%
VSGIX Vanguard Small-Cap Growth Index Fund Institutional Shares	0.45%	0.55%	0.55%	0.68%	0.56%	0.37%	0.45%	0.58%	0.80%	0.82%	1.09%	0.98%

Frequently Asked Questions

Can I hold both NESIX and VSGIX in my portfolio?

NESIX and VSGIX have a correlation of 0.85, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, NESIX or VSGIX?

NESIX has higher volatility (11.97%) compared to VSGIX (6.94%). In terms of maximum drawdown, NESIX dropped -49.61% vs VSGIX's -58.66%.

Which has better risk-adjusted returns?

NESIX currently has the higher Sharpe Ratio (4.03 vs 1.65), 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.