MARB vs. BAMU

Last updated Jun 4, 2026

MARB (First Trust Merger Arbitrage ETF) and BAMU (Brookstone Ultra-Short Bond ETF) are both exchange-traded funds - MARB is a Long-Short fund actively managed by First Trust, while BAMU is a Ultrashort Bond fund actively managed by Brookstone. Both are actively managed. Over the past year, MARB returned 6.18% vs 2.93% for BAMU. At a correlation of -0.03, they often move in opposite directions. MARB charges 2.30%/yr vs 1.09%/yr for BAMU.

Performance

MARB vs. BAMU - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in First Trust Merger Arbitrage ETF (MARB) and Brookstone Ultra-Short Bond ETF (BAMU). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, MARB achieves a 1.26% return, which is significantly higher than BAMU's 1.06% return.

MARB

• 1D: 0.05%
• 1M: 0.22%
• YTD: 1.26%
• 6M: 1.42%
• 1Y: 6.18%
• 3Y*: 4.29%
• 5Y*: 2.64%
• 10Y*: —

BAMU

• 1D: 0.02%
• 1M: 0.20%
• YTD: 1.06%
• 6M: 1.25%
• 1Y: 2.93%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

MARB vs. BAMU - Yearly Performance Comparison

	2026 (YTD)	2025	2024	2023
MARB First Trust Merger Arbitrage ETF	1.26%	7.02%	0.73%	0.69%
BAMU Brookstone Ultra-Short Bond ETF	1.06%	3.21%	4.14%	1.20%

Correlation

The correlation between MARB and BAMU is -0.15, meaning they tend to move in opposite directions. This is especially valuable for risk management - when one declines, the other has historically tended to hold steady or rise.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.15
Correlation (All Time) Calculated using the full available price history since Sep 28, 2023	-0.03

The correlation between MARB and BAMU shifts across timeframes, from -0.15 (1 year) to -0.03 (all time), reflecting how their relationship changes across market environments.

MARB vs. BAMU - Sectors Allocation Comparison

Sectors	MARB	BAMU
Healthcare	29.7%	-
Real Estate	20.0%	-
Communication Services	15.2%	-
Financial Services	15.0%	98.8%
Technology	14.3%	-
Industrials	9.1%	-
Consumer Cyclical	5.8%	-
Basic Materials	-	-
Consumer Defensive	-	-
Energy	-	-
Utilities	-	-

Return for Risk

MARB vs. BAMU — Risk / Return Rank

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

MARB

MARB Risk / Return Rank: 52
MARB Sharpe Ratio Rank: 32
MARB Sortino Ratio Rank: 34
MARB Omega Ratio Rank: 51
MARB Calmar Ratio Rank: 52
MARB Martin Ratio Rank: 90

BAMU

BAMU Risk / Return Rank: 98
BAMU Sharpe Ratio Rank: 97
BAMU Sortino Ratio Rank: 98
BAMU Omega Ratio Rank: 98
BAMU Calmar Ratio Rank: 99
BAMU Martin Ratio Rank: 99

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.

MARB vs. BAMU - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for First Trust Merger Arbitrage ETF (MARB) and Brookstone Ultra-Short Bond ETF (BAMU). 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.

	MARB	BAMU	Difference
Sharpe ratio: Return per unit of total volatility	1.17	4.98	-3.81
Sortino ratio: Return per unit of downside risk	1.80	8.77	-6.97
Omega ratio: Gain probability vs. loss probability	1.32	2.41	-1.09
Calmar ratio: Return relative to maximum drawdown	2.56	24.89	-22.33
Martin ratio: Return relative to average drawdown	20.98	97.89	-76.91
Data is calculated on a 1-year rolling basis and updated daily. The trend shows the change in the indicator over the past month.

MARB vs. BAMU - Sharpe Ratio Comparison

The current MARB Sharpe Ratio is 1.17, which is lower than the BAMU Sharpe Ratio of 4.98. The chart below compares the historical Sharpe Ratios of MARB and BAMU, 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

	MARB	BAMU	Difference
Sharpe Ratio (1Y) Calculated over the trailing 1-year period	1.17	4.98	-3.81
Sharpe Ratio (5Y) Calculated over the trailing 5-year period	0.62	—	—
Sharpe Ratio (All Time) Calculated using the full available price history	0.36	4.14	-3.78

Drawdowns

MARB vs. BAMU - Drawdown Comparison

The maximum MARB drawdown since its inception was -11.99%, which is greater than BAMU's maximum drawdown of -0.36%. Use the drawdown chart below to compare losses from any high point for MARB and BAMU.

Drawdown Indicators

	MARB	BAMU	Difference
Max Drawdown Largest peak-to-trough decline	-11.99%	-0.36%	-11.63%
Max Drawdown (1Y) Largest decline over 1 year	-2.43%	-0.12%	-2.31%
Max Drawdown (3Y) Largest decline over 3 years	-3.67%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-3.67%	—	—
Current Drawdown Current decline from peak	-0.00%	0.00%	0.00%
Average Drawdown Average peak-to-trough decline	-1.40%	-0.02%	-1.38%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.30%	0.03%	+0.27%

Volatility

MARB vs. BAMU - Volatility Comparison

First Trust Merger Arbitrage ETF (MARB) has a higher volatility of 0.47% compared to Brookstone Ultra-Short Bond ETF (BAMU) at 0.07%. This indicates that MARB's price experiences larger fluctuations and is considered to be riskier than BAMU based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	MARB	BAMU	Difference
Volatility (1M) Calculated over the trailing 1-month period	0.47%	0.07%	+0.40%
Volatility (6M) Calculated over the trailing 6-month period	2.18%	0.43%	+1.75%
Volatility (1Y) Calculated over the trailing 1-year period	5.31%	0.59%	+4.72%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.27%	0.87%	+3.40%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	5.60%	0.87%	+4.73%

MARB vs. BAMU - Expense Ratio Comparison

MARB has a 2.30% expense ratio, which is higher than BAMU's 1.09% expense ratio.

Dividends

MARB vs. BAMU - Dividend Comparison

MARB's dividend yield for the trailing twelve months is around 2.98%, less than BAMU's 3.06% yield.

Position	TTM	2025	2024	2023	2022
BAMU Brookstone Ultra-Short Bond ETF	3.06%	3.20%	3.97%	0.84%	0.00%
MARB First Trust Merger Arbitrage ETF	2.98%	3.01%	2.11%	2.20%	0.99%

Frequently Asked Questions

Can I hold both MARB and BAMU in my portfolio?

MARB and BAMU have a correlation of -0.15, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, MARB or BAMU?

MARB has higher volatility (0.47%) compared to BAMU (0.07%). In terms of maximum drawdown, MARB dropped -11.99% vs BAMU's -0.36%.

Which ETF is better, MARB or BAMU?

On 1-year performance, MARB leads with 6.18% vs 2.93% for BAMU. On fees, BAMU is cheaper at 1.09% per year. On volatility, BAMU has been the lower-risk option at 0.07%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, MARB or BAMU?

Over the 1-year period, MARB has performed better with a 6.18% return vs 2.93%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, MARB or BAMU?

BAMU is cheaper with a 1.09% expense ratio, compared with 2.30% for MARB.

Which ETF pays a higher dividend yield, MARB or BAMU?

BAMU has the higher dividend yield at 3.06%, compared with 2.98% for MARB.

What is the main difference between MARB and BAMU?

MARB is categorized as Long-Short, while BAMU is Ultrashort Bond. They also come from different issuers: First Trust and Brookstone. Their fees differ too: 2.30% for MARB and 1.09% for BAMU.

Which has better risk-adjusted returns?

BAMU currently has the higher Sharpe Ratio (4.98 vs 1.17), 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.