MASKX vs. BIAUX

Last updated Jun 4, 2026

MASKX (iShares Russell 2000 Small-Cap Index Fund) and BIAUX (Brown Advisory Small-Cap Fundamental Value Fund) are both Small Cap Blend Equities funds. Over the past 10 years, MASKX returned 11.12%/yr vs 9.89%/yr for BIAUX. Their correlation of 0.93 suggests significant overlap in exposure. MASKX charges 0.12%/yr vs 1.10%/yr for BIAUX.

Performance

MASKX vs. BIAUX - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in iShares Russell 2000 Small-Cap Index Fund (MASKX) and Brown Advisory Small-Cap Fundamental Value Fund (BIAUX). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MASKX achieves a 18.62% return, which is significantly higher than BIAUX's 12.97% return. Over the past 10 years, MASKX has outperformed BIAUX with an annualized return of 11.12%, while BIAUX has yielded a comparatively lower 9.89% annualized return.

MASKX

• 1D: 0.89%
• 1M: 4.97%
• YTD: 18.62%
• 6M: 17.33%
• 1Y: 41.04%
• 3Y*: 18.52%
• 5Y*: 6.53%
• 10Y*: 11.12%

BIAUX

• 1D: 0.98%
• 1M: 0.91%
• YTD: 12.97%
• 6M: 12.56%
• 1Y: 29.00%
• 3Y*: 15.94%
• 5Y*: 7.73%
• 10Y*: 9.89%

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

MASKX vs. BIAUX - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023	2022	2021	2020	2019	2018	2017
MASKX iShares Russell 2000 Small-Cap Index Fund	18.62%	12.76%	11.35%	16.99%	-20.39%	14.54%	19.99%	25.54%	-11.03%	14.61%
BIAUX Brown Advisory Small-Cap Fundamental Value Fund	12.97%	5.71%	11.73%	16.16%	-8.74%	31.11%	-5.69%	29.85%	-13.48%	12.17%

Correlation

The correlation between MASKX and BIAUX is 0.87, 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	0.87
Correlation (3Y) Calculated over the trailing 3-year period	0.92
Correlation (5Y) Calculated over the trailing 5-year period	0.91
Correlation (10Y) Calculated over the trailing 10-year period	0.91
Correlation (All Time) Calculated using the full available price history since Jan 5, 2009	0.93

The correlation between MASKX and BIAUX has been stable across timeframes, ranging from 0.87 to 0.93 - a consistent structural relationship.

Return for Risk

MASKX vs. BIAUX — Risk / Return Rank

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

MASKX

MASKX Risk / Return Rank: 64
MASKX Sharpe Ratio Rank: 60
MASKX Sortino Ratio Rank: 55
MASKX Omega Ratio Rank: 47
MASKX Calmar Ratio Rank: 84
MASKX Martin Ratio Rank: 74

BIAUX

BIAUX Risk / Return Rank: 52
BIAUX Sharpe Ratio Rank: 41
BIAUX Sortino Ratio Rank: 43
BIAUX Omega Ratio Rank: 38
BIAUX Calmar Ratio Rank: 83
BIAUX Martin Ratio Rank: 56

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.

MASKX vs. BIAUX - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for iShares Russell 2000 Small-Cap Index Fund (MASKX) and Brown Advisory Small-Cap Fundamental Value Fund (BIAUX). 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.

	MASKX	BIAUX	Difference
Sharpe ratio: Return per unit of total volatility	2.28	1.87	+0.40
Sortino ratio: Return per unit of downside risk	3.12	2.76	+0.36
Omega ratio: Gain probability vs. loss probability	1.37	1.33	+0.05
Calmar ratio: Return relative to maximum drawdown	3.95	3.87	+0.07
Martin ratio: Return relative to average drawdown	14.03	11.29	+2.74
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MASKX vs. BIAUX - Sharpe Ratio Comparison

The current MASKX Sharpe Ratio is 2.28, which is comparable to the BIAUX Sharpe Ratio of 1.87. The chart below compares the historical Sharpe Ratios of MASKX and BIAUX, calculated using daily returns over the previous 12 months. A higher Sharpe Ratio indicates better risk-adjusted performance relative to the risk-free rate.

Sharpe Ratios by Period

	MASKX	BIAUX	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	2.28	1.87	+0.40
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.28	0.39	-0.11
Sharpe Ratio (10Y) Calculated over the trailing 10-year period	0.47	0.46	+0.01
Sharpe Ratio (All Time) Calculated using the full available price history	0.37	0.60	-0.23

Drawdowns

MASKX vs. BIAUX - Drawdown Comparison

The maximum MASKX drawdown since its inception was -59.06%, which is greater than BIAUX's maximum drawdown of -45.55%. Use the drawdown chart below to compare losses from any high point for MASKX and BIAUX.

Drawdown Indicators

	MASKX	BIAUX	Difference
Max Drawdown Largest peak-to-trough decline	-59.06%	-45.55%	-13.51%
Max Drawdown (1Y) Largest decline over 1 year	-11.01%	-8.22%	-2.79%
Max Drawdown (3Y) Largest decline over 3 years	-27.53%	-25.16%	-2.37%
Max Drawdown (5Y) Largest decline over 5 years	-31.98%	-25.16%	-6.82%
Max Drawdown (10Y) Largest decline over 10 years	-41.68%	-45.55%	+3.87%
Current Drawdown Current decline from peak	-0.13%	-0.63%	+0.50%
Average Drawdown Average peak-to-trough decline	-11.63%	-6.19%	-5.44%
Ulcer Index Depth and duration of drawdowns from previous peaks	3.09%	2.82%	+0.27%

Volatility

MASKX vs. BIAUX - Volatility Comparison

iShares Russell 2000 Small-Cap Index Fund (MASKX) has a higher volatility of 5.60% compared to Brown Advisory Small-Cap Fundamental Value Fund (BIAUX) at 4.35%. This indicates that MASKX's price experiences larger fluctuations and is considered to be riskier than BIAUX based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MASKX	BIAUX	Difference
Volatility (1M) Calculated over the trailing 1-month period	5.60%	4.35%	+1.25%
Volatility (6M) Calculated over the trailing 6-month period	13.57%	11.22%	+2.35%
Volatility (1Y) Calculated over the trailing 1-year period	19.10%	17.01%	+2.09%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	23.16%	19.78%	+3.38%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	23.70%	21.56%	+2.14%

MASKX vs. BIAUX - Expense Ratio Comparison

MASKX has a 0.12% expense ratio, which is lower than BIAUX's 1.10% expense ratio.

Dividends

MASKX vs. BIAUX - Dividend Comparison

MASKX's dividend yield for the trailing twelve months is around 2.64%, less than BIAUX's 11.94% yield.

Position	TTM	2025	2024	2023	2022	2021	2020	2019	2018	2017	2016	2015
BIAUX Brown Advisory Small-Cap Fundamental Value Fund	11.94%	13.49%	16.54%	5.94%	6.16%	0.48%	0.47%	9.38%	14.31%	4.11%	0.34%	2.41%
MASKX iShares Russell 2000 Small-Cap Index Fund	2.64%	3.13%	4.81%	2.92%	1.70%	7.64%	1.42%	3.43%	4.26%	3.15%	4.60%	3.63%

Frequently Asked Questions

Can I hold both MASKX and BIAUX in my portfolio?

MASKX and BIAUX have a correlation of 0.87, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MASKX or BIAUX?

MASKX has higher volatility (5.60%) compared to BIAUX (4.35%). In terms of maximum drawdown, MASKX dropped -59.06% vs BIAUX's -45.55%.

Which has better risk-adjusted returns?

MASKX currently has the higher Sharpe Ratio (2.28 vs 1.87), 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.