NESIX vs. RMBBX

Last updated Jun 24, 2026

NESIX (Needham Small Cap Growth Fund Institutional) and RMBBX (RMB Small Cap Fund) are both Small Cap Growth Equities funds. A 0.79 correlation means they provide meaningful diversification when combined. NESIX charges 1.18%/yr vs 1.06%/yr for RMBBX.

Performance

NESIX vs. RMBBX - Performance Comparison

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

Returns By Period

NESIX

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

RMBBX

• 1D: —
• 1M: —
• YTD: —
• 6M: —
• 1Y: —
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

NESIX vs. RMBBX - 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%
RMBBX RMB Small Cap Fund	7.65%	-0.06%	15.10%	18.71%	-24.78%	24.32%	17.62%	27.51%	-5.47%	10.48%

Correlation

The correlation between NESIX and RMBBX is 0.67, which is moderate. They share some common price drivers but move independently often enough to provide real diversification benefit when combined.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.67
Correlation (3Y) Calculated over the trailing 3-year period	0.77
Correlation (5Y) Calculated over the trailing 5-year period	0.80
Correlation (All Time) Calculated using the full available price history since Jan 3, 2017	0.79

The correlation between NESIX and RMBBX shifts across timeframes, from 0.67 (1 year) to 0.80 (5 years), reflecting how their relationship changes across market environments.

Return for Risk

NESIX vs. RMBBX — 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

RMBBX

Risk / return metrics aren't available yet — we need at least 12 months of trading data to calculate them.

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. RMBBX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for Needham Small Cap Growth Fund Institutional (NESIX) and RMB Small Cap Fund (RMBBX). 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	RMBBX	Difference
Sharpe ratio: Return per unit of total volatility	4.03	—	—
Sortino ratio: Return per unit of downside risk	4.36	—	—
Omega ratio: Gain probability vs. loss probability	1.57	—	—
Calmar ratio: Return relative to maximum drawdown	7.37	—	—
Martin ratio: Return relative to average drawdown	30.02	—	—

Drawdowns

Drawdown Indicators

	NESIX	RMBBX	Difference
Max Drawdown Largest peak-to-trough decline	-49.61%	—	—
Max Drawdown (1Y) Largest decline over 1 year	-17.12%	—	—
Max Drawdown (3Y) Largest decline over 3 years	-35.21%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-49.61%	—	—
Current Drawdown Current decline from peak	-0.37%	—	—
Average Drawdown Average peak-to-trough decline	-14.92%	—	—
Ulcer Index Depth and duration of drawdowns from previous peaks	4.19%	—	—

Volatility

Volatility by Period

	NESIX	RMBBX	Difference
Volatility (1M) Calculated over the trailing 1-month period	11.97%	—	—
Volatility (6M) Calculated over the trailing 6-month period	22.24%	—	—
Volatility (1Y) Calculated over the trailing 1-year period	31.35%	—	—
Volatility (5Y) Calculated over the trailing 5-year period, annualized	29.59%	—	—
Volatility (10Y) Calculated over the trailing 10-year period, annualized	26.56%	—	—

NESIX vs. RMBBX - Expense Ratio Comparison

NESIX has a 1.18% expense ratio, which is higher than RMBBX's 1.06% expense ratio.

Dividends

NESIX vs. RMBBX - Dividend Comparison

NESIX has not paid dividends to shareholders, while RMBBX's dividend yield for the trailing twelve months is around 6.38%.

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%
RMBBX RMB Small Cap Fund	6.38%	5.98%	2.15%	5.62%	2.75%	6.44%	4.38%	4.73%	45.44%	21.23%	3.70%	9.34%

Frequently Asked Questions

Can I hold both NESIX and RMBBX in my portfolio?

NESIX and RMBBX have a correlation of 0.67, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.