BBMIX vs. POAGX

Last updated Aug 4, 2026

BBMIX (BBH Select Series - Mid Cap Fund) and POAGX (PRIMECAP Odyssey Aggressive Growth Fund) are both Mid Cap Growth Equities funds. Over the past 5 years, BBMIX returned 2.02%/yr vs 9.22%/yr for POAGX. Their 0.74 correlation means they have sometimes moved together and sometimes differently. BBMIX charges 0.90%/yr vs 0.66%/yr for POAGX.

Performance

BBMIX vs. POAGX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in BBH Select Series - Mid Cap Fund (BBMIX) and PRIMECAP Odyssey Aggressive Growth Fund (POAGX). 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 POAGX's 19.40% 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%

POAGX

• 1D: -0.78%
• 1M: -4.47%
• 6M: 12.65%
• YTD: 19.40%
• 1Y: 46.68%
• 3Y*: 21.62%
• 5Y*: 9.22%
• 10Y*: 14.67%
• ALL TIME*: 14.02%

*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
POAGX PRIMECAP Odyssey Aggressive Growth Fund	$0.00	$0.00	$0.00

BBMIX vs. POAGX - 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%
POAGX PRIMECAP Odyssey Aggressive Growth Fund	19.40%	28.68%	12.56%	25.02%	-24.25%	-0.51%

Correlation

The correlation between BBMIX and POAGX is 0.30, which is low. Their historical price movements had little consistent relationship.

	Correlation
Correlation (1Y) Focuses on recent behavior, but can change the most.	0.30
Correlation (3Y) Balances recent behavior with more history.	0.65
Correlation (5Y) Shows whether the relationship held over a longer period.	0.74
Correlation (All Time) Calculated using the full available price history since May 24, 2021	0.74

Over the past year, the correlation between BBMIX and POAGX has dropped to 0.30 - well below their long-term average of 0.74, suggesting their price drivers have been diverging.

Return for Risk

BBMIX vs. POAGX — 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

POAGX

POAGX Risk / Return Rank: 75
POAGX Sharpe Ratio Rank: 77
POAGX Sortino Ratio Rank: 74
POAGX Omega Ratio Rank: 70
POAGX Calmar Ratio Rank: 79
POAGX Martin Ratio Rank: 75

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. POAGX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for BBH Select Series - Mid Cap Fund (BBMIX) and PRIMECAP Odyssey Aggressive Growth Fund (POAGX). 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	POAGX	Difference
Sharpe ratio: Return per unit of total volatility	-0.46	1.86	-2.33
Sortino ratio: Return per unit of downside risk	-0.61	2.58	-3.19
Omega ratio: Gain probability vs. loss probability	0.89	1.32	-0.43
Calmar ratio: Return relative to maximum drawdown	-0.67	2.67	-3.34
Martin ratio: Return relative to average drawdown	-1.08	9.61	-10.68

BBMIX vs. POAGX - Sharpe Ratio Comparison

The current BBMIX Sharpe Ratio is -0.46, which is lower than the POAGX Sharpe Ratio of 1.86. The chart below compares the historical Sharpe Ratios of BBMIX and POAGX, 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. POAGX - Drawdown Comparison

The maximum BBMIX drawdown since its inception was -28.90%, smaller than the maximum POAGX drawdown of -55.77%. Use the drawdown chart below to compare losses from any high point for BBMIX and POAGX.

Drawdown Indicators

	BBMIX	POAGX	Difference
Max Drawdown Largest peak-to-trough decline	-28.90%	-55.77%	+26.87%
Max Drawdown (1Y) Largest decline over 1 year	-6.92%	-16.87%	+9.95%
Max Drawdown (3Y) Largest decline over 3 years	-23.79%	-24.73%	+0.94%
Max Drawdown (5Y) Largest decline over 5 years	-28.90%	-38.80%	+9.90%
Max Drawdown (10Y) Largest decline over 10 years	—	-38.80%	—
Current Drawdown Current decline from peak	-11.28%	-8.96%	-2.32%
Average Drawdown Average peak-to-trough decline	-10.53%	-9.50%	-1.03%
Ulcer Index Depth and duration of drawdowns from previous peaks	5.65%	4.68%	+0.97%

Volatility

BBMIX vs. POAGX - Volatility Comparison

The current volatility for BBH Select Series - Mid Cap Fund (BBMIX) is 0.00%, while PRIMECAP Odyssey Aggressive Growth Fund (POAGX) has a volatility of 8.24%. This indicates that BBMIX experiences smaller price fluctuations and is considered to be less risky than POAGX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	BBMIX	POAGX	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.00%	8.24%	-8.24%
Volatility (6M) Calculated over the trailing 6-month period	3.32%	20.54%	-17.22%
Volatility (1Y) Calculated over the trailing 1-year period	10.07%	24.21%	-14.14%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	19.60%	23.58%	-3.98%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	19.35%	23.15%	-3.80%

BBMIX vs. POAGX - Expense Ratio Comparison

BBMIX has a 0.90% expense ratio, which is higher than POAGX's 0.66% expense ratio.

Dividends

BBMIX vs. POAGX - Dividend Comparison

BBMIX has not paid dividends to shareholders, while POAGX's dividend yield for the trailing twelve months is around 11.10%.

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%
POAGX PRIMECAP Odyssey Aggressive Growth Fund	11.10%	13.25%	9.90%	5.54%	10.78%	5.93%	7.84%	5.33%	7.82%	0.86%	16.63%	12.52%

Frequently Asked Questions

Can I hold both BBMIX and POAGX in my portfolio?

BBMIX and POAGX have a correlation of 0.30, 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 POAGX?

POAGX has higher volatility (8.24%) compared to BBMIX (0.00%). In terms of maximum drawdown, BBMIX dropped -28.90% vs POAGX's -55.77%.

Which has better risk-adjusted returns?

POAGX currently has the higher Sharpe Ratio (1.86 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.