BBMIX vs. TRMSX

Last updated Aug 4, 2026

BBMIX (BBH Select Series - Mid Cap Fund) and TRMSX (T. Rowe Price Mid-Cap Index Fund) are both Mid Cap Growth Equities funds. Over the past 5 years, BBMIX returned 2.02%/yr vs 6.20%/yr for TRMSX. Their correlation of 0.80 means they have usually moved in the same direction. BBMIX charges 0.90%/yr vs 0.14%/yr for TRMSX.

Performance

BBMIX vs. TRMSX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BBH Select Series - Mid Cap Fund (BBMIX) and T. Rowe Price Mid-Cap Index Fund (TRMSX). 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 TRMSX's 9.69% return.

BBMIX

• 1D: 0.00%
• 1M: 0.00%
• 6M: 2.86%
• YTD: 2.86%
• 1Y: -1.54%
• 3Y*: 4.12%
• 5Y*: 2.02%
• 10Y*: —
• ALL TIME*: 2.80%

TRMSX

• 1D: -0.45%
• 1M: -3.27%
• 6M: 8.32%
• YTD: 9.69%
• 1Y: 14.27%
• 3Y*: 16.50%
• 5Y*: 6.20%
• 10Y*: —
• ALL TIME*: 7.82%

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

Liquidity Comparison

Position	Avg. Volume Value (2W)	Avg. Volume Value (1M)	Avg. Volume Value (3M)
BBMIX BBH Select Series - Mid Cap Fund	$0.00	$0.00	$0.00
TRMSX T. Rowe Price Mid-Cap Index Fund	$0.00	$0.00	$0.00

BBMIX vs. TRMSX - 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%
TRMSX T. Rowe Price Mid-Cap Index Fund	9.69%	12.61%	19.98%	29.90%	-28.56%	4.48%

Correlation

The correlation between BBMIX and TRMSX is 0.29, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.29
Correlation (3Y) Balances recent behavior with more history.	0.69
Correlation (5Y) Shows whether the relationship held over a longer period.	0.80
Correlation (All Time) Calculated using the full available price history since May 24, 2021	0.80

Over the past year, the correlation between BBMIX and TRMSX has dropped to 0.29 - well below their long-term average of 0.80, suggesting their price drivers have been diverging.

Return for Risk

BBMIX vs. TRMSX — Risk / Return Rank

Compare historical risk-adjusted metric ranks over the past 12 months.

BBMIX

BBMIX Risk / Return Rank: 1
BBMIX Sharpe Ratio Rank: 1
BBMIX Sortino Ratio Rank: 1
BBMIX Omega Ratio Rank: 1
BBMIX Calmar Ratio Rank: 1
BBMIX Martin Ratio Rank: 1

TRMSX

TRMSX Risk / Return Rank: 28
TRMSX Sharpe Ratio Rank: 23
TRMSX Sortino Ratio Rank: 25
TRMSX Omega Ratio Rank: 22
TRMSX Calmar Ratio Rank: 36
TRMSX Martin Ratio Rank: 35

The rank (0–100) uses a weighted average of the Sharpe, Sortino, Omega, Calmar, and Martin percentile ranks for the trailing 12 months. Higher means stronger historical risk-adjusted performance within the peer group.

BBMIX vs. TRMSX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BBH Select Series - Mid Cap Fund (BBMIX) and T. Rowe Price Mid-Cap Index Fund (TRMSX). 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	TRMSX	Difference
Sharpe ratio: Return per unit of total volatility	-0.46	0.89	-1.36
Sortino ratio: Return per unit of downside risk	-0.61	1.39	-2.00
Omega ratio: Gain probability vs. loss probability	0.89	1.16	-0.27
Calmar ratio: Return relative to maximum drawdown	-0.67	1.66	-2.33
Martin ratio: Return relative to average drawdown	-1.08	5.46	-6.54

BBMIX vs. TRMSX - Sharpe Ratio Comparison

The current BBMIX Sharpe Ratio is -0.46, which is lower than the TRMSX Sharpe Ratio of 0.89. The chart below compares the historical Sharpe Ratios of BBMIX and TRMSX, 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. TRMSX - Drawdown Comparison

The maximum BBMIX drawdown since its inception was -28.90%, smaller than the maximum TRMSX drawdown of -37.34%. Use the drawdown chart below to compare losses from any high point for BBMIX and TRMSX.

Drawdown Indicators

	BBMIX	TRMSX	Difference
Max Drawdown Largest peak-to-trough decline	-28.90%	-37.34%	+8.44%
Max Drawdown (1Y) Largest decline over 1 year	-6.92%	-9.51%	+2.59%
Max Drawdown (3Y) Largest decline over 3 years	-23.79%	-26.02%	+2.23%
Max Drawdown (5Y) Largest decline over 5 years	-28.90%	-37.34%	+8.44%
Current Drawdown Current decline from peak	-11.28%	-4.34%	-6.94%
Average Drawdown Average peak-to-trough decline	-10.53%	-13.51%	+2.98%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.65%	2.77%	+2.88%

Volatility

BBMIX vs. TRMSX - Volatility Comparison

The current volatility for BBH Select Series - Mid Cap Fund (BBMIX) is 0.00%, while T. Rowe Price Mid-Cap Index Fund (TRMSX) has a volatility of 4.05%. This indicates that BBMIX experiences smaller price fluctuations and is considered to be less risky than TRMSX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BBMIX	TRMSX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	4.05%	-4.05%
Volatility (6M) Calculated over the trailing 6-month period	3.32%	13.21%	-9.89%
Volatility (1Y) Calculated over the trailing 1-year period	10.07%	17.68%	-7.61%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.60%	23.11%	-3.51%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.35%	22.78%	-3.43%

BBMIX vs. TRMSX - Expense Ratio Comparison

BBMIX has a 0.90% expense ratio, which is higher than TRMSX's 0.14% expense ratio.

Dividends

BBMIX vs. TRMSX - Dividend Comparison

BBMIX has not paid dividends to shareholders, while TRMSX's dividend yield for the trailing twelve months is around 5.91%.

Position	TTM	2025	2024	2023	2022	2021
BBMIX BBH Select Series - Mid Cap Fund	0.00%	0.00%	0.32%	0.10%	0.00%	0.00%
TRMSX T. Rowe Price Mid-Cap Index Fund	5.91%	6.49%	1.98%	0.86%	1.92%	4.01%

Frequently Asked Questions

Can I hold both BBMIX and TRMSX in my portfolio?

BBMIX and TRMSX have a correlation of 0.29, 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 TRMSX?

TRMSX has higher volatility (4.05%) compared to BBMIX (0.00%). In terms of maximum drawdown, BBMIX dropped -28.90% vs TRMSX's -37.34%.

Which has better risk-adjusted returns?

TRMSX currently has the higher Sharpe Ratio (0.89 vs -0.46), 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.