BBMIX vs. NEEGX

Last updated Jun 26, 2026

BBMIX (BBH Select Series - Mid Cap Fund) and NEEGX (Needham Growth Fund) are both Mid Cap Growth Equities funds. Over the past 5 years, BBMIX returned 2.56%/yr vs 13.28%/yr for NEEGX. A 0.75 correlation means they provide meaningful diversification when combined. BBMIX charges 0.90%/yr vs 1.78%/yr for NEEGX.

Performance

BBMIX vs. NEEGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BBH Select Series - Mid Cap Fund (BBMIX) and Needham Growth Fund (NEEGX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, BBMIX achieves a 2.86% return, which is significantly lower than NEEGX's 56.72% return.

BBMIX

• 1D: 0.00%
• 1M: 0.00%
• YTD: 2.86%
• 6M: 2.86%
• 1Y: -1.29%
• 3Y*: 6.50%
• 5Y*: 2.56%
• 10Y*: —

NEEGX

• 1D: -0.15%
• 1M: 3.51%
• YTD: 56.72%
• 6M: 53.39%
• 1Y: 83.17%
• 3Y*: 27.89%
• 5Y*: 13.28%
• 10Y*: 16.45%

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

BBMIX vs. NEEGX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021
BBMIX BBH Select Series - Mid Cap Fund	2.86%	-6.45%	11.41%	26.01%	-24.76%	13.50%
NEEGX Needham Growth Fund	56.72%	8.76%	14.45%	26.85%	-33.57%	20.74%

Correlation

The correlation between BBMIX and NEEGX is 0.36, which is low. Their price movements are largely independent, making them effective diversification partners.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	0.36
Correlation (3Y) Calculated over the trailing 3-year period	0.66
Correlation (5Y) Calculated over the trailing 5-year period	0.76
Correlation (All Time) Calculated using the full available price history since May 24, 2021	0.75

Over the past year, the correlation between BBMIX and NEEGX has dropped to 0.36 - well below their long-term average of 0.75, suggesting their price drivers have been diverging.

Return for Risk

BBMIX vs. NEEGX — Risk / Return Rank

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

BBMIX

BBMIX Risk / Return Rank: 2
BBMIX Sharpe Ratio Rank: 2
BBMIX Sortino Ratio Rank: 2
BBMIX Omega Ratio Rank: 2
BBMIX Calmar Ratio Rank: 2
BBMIX Martin Ratio Rank: 2

NEEGX

NEEGX Risk / Return Rank: 91
NEEGX Sharpe Ratio Rank: 95
NEEGX Sortino Ratio Rank: 83
NEEGX Omega Ratio Rank: 81
NEEGX Calmar Ratio Rank: 97
NEEGX Martin Ratio Rank: 96

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.

BBMIX vs. NEEGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BBH Select Series - Mid Cap Fund (BBMIX) and Needham Growth Fund (NEEGX). 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.

	BBMIX	NEEGX	Difference
Sharpe ratio: Return per unit of total volatility	-0.25	2.89	-3.15
Sortino ratio: Return per unit of downside risk	-0.29	3.39	-3.68
Omega ratio: Gain probability vs. loss probability	0.95	1.45	-0.50
Calmar ratio: Return relative to maximum drawdown	-0.31	6.38	-6.70
Martin ratio: Return relative to average drawdown	-0.47	21.11	-21.58

BBMIX vs. NEEGX - Sharpe Ratio Comparison

The current BBMIX Sharpe Ratio is -0.25, which is lower than the NEEGX Sharpe Ratio of 2.89. The chart below compares the historical Sharpe Ratios of BBMIX and NEEGX, 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

BBMIX vs. NEEGX - Drawdown Comparison

The maximum BBMIX drawdown since its inception was -28.90%, smaller than the maximum NEEGX drawdown of -53.60%. Use the drawdown chart below to compare losses from any high point for BBMIX and NEEGX.

Drawdown Indicators

	BBMIX	NEEGX	Difference
Max Drawdown Largest peak-to-trough decline	-28.90%	-53.60%	+24.70%
Max Drawdown (1Y) Largest decline over 1 year	-8.89%	-13.27%	+4.38%
Max Drawdown (3Y) Largest decline over 3 years	-23.79%	-38.66%	+14.87%
Max Drawdown (5Y) Largest decline over 5 years	-28.90%	-43.35%	+14.45%
Max Drawdown (10Y) Largest decline over 10 years	—	-43.35%	—
Current Drawdown Current decline from peak	-11.28%	-5.14%	-6.14%
Average Drawdown Average peak-to-trough decline	-10.51%	-10.88%	+0.37%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.33%	4.00%	+1.33%

Volatility

BBMIX vs. NEEGX - Volatility Comparison

The current volatility for BBH Select Series - Mid Cap Fund (BBMIX) is 0.00%, while Needham Growth Fund (NEEGX) has a volatility of 14.05%. This indicates that BBMIX experiences smaller price fluctuations and is considered to be less risky than NEEGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BBMIX	NEEGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	14.05%	-14.05%
Volatility (6M) Calculated over the trailing 6-month period	5.87%	23.55%	-17.68%
Volatility (1Y) Calculated over the trailing 1-year period	11.00%	29.39%	-18.39%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.70%	28.80%	-9.10%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.55%	25.54%	-5.99%

BBMIX vs. NEEGX - Expense Ratio Comparison

BBMIX has a 0.90% expense ratio, which is lower than NEEGX's 1.78% expense ratio.

Dividends

BBMIX vs. NEEGX - Dividend Comparison

BBMIX has not paid dividends to shareholders, while NEEGX's dividend yield for the trailing twelve months is around 4.83%.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BBMIX BBH Select Series - Mid Cap Fund	0.00%	0.00%	0.32%	0.10%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
NEEGX Needham Growth Fund	4.83%	7.57%	3.92%	0.00%	1.78%	6.92%	5.73%	11.31%	17.79%	9.70%	4.22%	6.74%

Frequently Asked Questions

Can I hold both BBMIX and NEEGX in my portfolio?

BBMIX and NEEGX have a correlation of 0.36, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, BBMIX or NEEGX?

NEEGX has higher volatility (14.05%) compared to BBMIX (0.00%). In terms of maximum drawdown, BBMIX dropped -28.90% vs NEEGX's -53.60%.

Which has better risk-adjusted returns?

NEEGX currently has the higher Sharpe Ratio (2.89 vs -0.25), 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.