ARB vs. OOSP

Last updated Jun 24, 2026

ARB (AltShares Merger Arbitrage ETF) and OOSP (Obra Opportunistic Structured Products ETF) are both exchange-traded funds - ARB is a Hedge Fund fund tracking the Water Island Merger Arbitrage USD Hedged Index, while OOSP is a Multisector Bonds fund actively managed by Obra. ARB is passively managed, while OOSP is actively managed. Over the past year, ARB returned 4.94% vs 6.50% for OOSP. At a correlation of -0.06, they often move in opposite directions. ARB charges 0.87%/yr vs 0.90%/yr for OOSP.

Performance

ARB vs. OOSP - Performance Comparison

The chart below illustrates the hypothetical performance of a $10,000 investment in AltShares Merger Arbitrage ETF (ARB) and Obra Opportunistic Structured Products ETF (OOSP). The values are adjusted to include any dividend payments, if applicable.

Returns By Period

In the year-to-date period, ARB achieves a 2.12% return, which is significantly lower than OOSP's 2.66% return.

ARB

• 1D: 0.15%
• 1M: 0.40%
• YTD: 2.12%
• 6M: 2.35%
• 1Y: 4.94%
• 3Y*: 6.14%
• 5Y*: 4.01%
• 10Y*: —

OOSP

• 1D: 0.00%
• 1M: 0.36%
• YTD: 2.66%
• 6M: 2.82%
• 1Y: 6.50%
• 3Y*: —
• 5Y*: —
• 10Y*: —

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

ARB vs. OOSP - Yearly Performance Comparison

	2026 (YTD)	2025	2024
ARB AltShares Merger Arbitrage ETF	2.12%	6.05%	2.66%
OOSP Obra Opportunistic Structured Products ETF	2.66%	7.41%	6.27%

Correlation

The correlation between ARB and OOSP is -0.08, meaning there is essentially no relationship between their price movements. Each responds to its own set of market drivers, making them strong candidates for combining in a diversified portfolio.

	Correlation
Correlation (1Y) Calculated over the trailing 1-year period	-0.08
Correlation (All Time) Calculated using the full available price history since Apr 10, 2024	-0.06

Return for Risk

ARB vs. OOSP — Risk / Return Rank

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

ARB

ARB Risk / Return Rank: 67
ARB Sharpe Ratio Rank: 49
ARB Sortino Ratio Rank: 57
ARB Omega Ratio Rank: 55
ARB Calmar Ratio Rank: 86
ARB Martin Ratio Rank: 87

OOSP

OOSP Risk / Return Rank: 72
OOSP Sharpe Ratio Rank: 57
OOSP Sortino Ratio Rank: 59
OOSP Omega Ratio Rank: 67
OOSP Calmar Ratio Rank: 89
OOSP Martin Ratio Rank: 88

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.

ARB vs. OOSP - Risk-Adjusted Trends Comparison

This table presents a comparison of risk-adjusted performance metrics for AltShares Merger Arbitrage ETF (ARB) and Obra Opportunistic Structured Products ETF (OOSP). 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.

	ARB	OOSP	Difference
Sharpe ratio: Return per unit of total volatility	1.61	1.79	-0.18
Sortino ratio: Return per unit of downside risk	2.54	2.60	-0.06
Omega ratio: Gain probability vs. loss probability	1.32	1.38	-0.05
Calmar ratio: Return relative to maximum drawdown	4.62	4.97	-0.35
Martin ratio: Return relative to average drawdown	17.70	18.41	-0.71

ARB vs. OOSP - Sharpe Ratio Comparison

The current ARB Sharpe Ratio is 1.61, which is comparable to the OOSP Sharpe Ratio of 1.79. The chart below compares the historical Sharpe Ratios of ARB and OOSP, 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

ARB vs. OOSP - Drawdown Comparison

The maximum ARB drawdown since its inception was -5.60%, which is greater than OOSP's maximum drawdown of -1.31%. Use the drawdown chart below to compare losses from any high point for ARB and OOSP.

Drawdown Indicators

	ARB	OOSP	Difference
Max Drawdown Largest peak-to-trough decline	-5.60%	-1.31%	-4.29%
Max Drawdown (1Y) Largest decline over 1 year	-1.07%	-1.31%	+0.24%
Max Drawdown (3Y) Largest decline over 3 years	-2.13%	—	—
Max Drawdown (5Y) Largest decline over 5 years	-5.60%	—	—
Current Drawdown Current decline from peak	-0.38%	0.00%	-0.38%
Average Drawdown Average peak-to-trough decline	-0.94%	-0.20%	-0.74%
Ulcer Index Depth and duration of drawdowns from previous peaks	0.28%	0.35%	-0.07%

Volatility

ARB vs. OOSP - Volatility Comparison

AltShares Merger Arbitrage ETF (ARB) has a higher volatility of 1.22% compared to Obra Opportunistic Structured Products ETF (OOSP) at 0.39%. This indicates that ARB's price experiences larger fluctuations and is considered to be riskier than OOSP based on this measure. The chart below showcases a comparison of their rolling one-month volatility.

Volatility by Period

	ARB	OOSP	Difference
Volatility (1M) Calculated over the trailing 1-month period	1.22%	0.39%	+0.83%
Volatility (6M) Calculated over the trailing 6-month period	2.63%	2.17%	+0.46%
Volatility (1Y) Calculated over the trailing 1-year period	3.10%	3.65%	-0.55%
Volatility (5Y) Calculated over the trailing 5-year period, annualized	4.43%	3.32%	+1.11%
Volatility (10Y) Calculated over the trailing 10-year period, annualized	4.40%	3.32%	+1.08%

ARB vs. OOSP - Expense Ratio Comparison

ARB has a 0.87% expense ratio, which is lower than OOSP's 0.90% expense ratio.

Dividends

ARB vs. OOSP - Dividend Comparison

ARB's dividend yield for the trailing twelve months is around 0.42%, less than OOSP's 6.45% yield.

Position	TTM	2025	2024	2023	2022	2021	2020
ARB AltShares Merger Arbitrage ETF	0.42%	0.43%	1.12%	0.00%	4.18%	0.00%	2.87%
OOSP Obra Opportunistic Structured Products ETF	6.45%	6.71%	5.42%	0.00%	0.00%	0.00%	0.00%

Frequently Asked Questions

Can I hold both ARB and OOSP in my portfolio?

ARB and OOSP have a correlation of -0.08, meaning they provide meaningful diversification benefit when combined. Depending on your allocation goals, holding both could reduce overall portfolio risk.

Which is riskier, ARB or OOSP?

ARB has higher volatility (1.22%) compared to OOSP (0.39%). In terms of maximum drawdown, ARB dropped -5.60% vs OOSP's -1.31%.

Which ETF is better, ARB or OOSP?

On 1-year performance, OOSP leads with 6.50% vs 4.94% for ARB. On fees, ARB is cheaper at 0.87% per year. On volatility, OOSP has been the lower-risk option at 0.39%. The better choice depends on whether you care most about return, fees, risk, or income.

Which ETF has performed better, ARB or OOSP?

Over the 1-year period, OOSP has performed better with a 6.50% return vs 4.94%. Past performance does not guarantee future results, so compare this with risk, fees, and fund exposure.

Which ETF is cheaper, ARB or OOSP?

ARB is cheaper with a 0.87% expense ratio, compared with 0.90% for OOSP.

Which ETF pays a higher dividend yield, ARB or OOSP?

OOSP has the higher dividend yield at 6.45%, compared with 0.42% for ARB.

What is the main difference between ARB and OOSP?

ARB is categorized as Hedge Fund, while OOSP is Multisector Bonds. They also come from different issuers: Water Island Capital Partners LP and Obra. Their fees differ too: 0.87% for ARB and 0.90% for OOSP.

Which has better risk-adjusted returns?

OOSP currently has the higher Sharpe Ratio (1.79 vs 1.61), 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.