AltShares Merger Arbitrage ETF

ARB
ETF Ticker

+3.41%

+4.32%

NYSE Arca Exchange

Alternative

Global

Hedge Fund

The AltShares Merger Arbitrage ETF, ARB_US, is listed on the NYSE Arca Exchange and tracks the Water Island Merger Arbitrage USD Hedged index. This alternative fund provides exposure to Style and has assets under management of $102.0m (as of Aug 31, 2026). The ETF trades in USD and was listed on the exchange on May 5, 2020. It has a net expense ratio of 75bps. (All data in USD as of Oct 12, 2026 unless stated.)

The underlying Water Island Merger Arbitrage USD Hedged Index provides rules-based exposure to global merger arbitrage via long target and short acquirer positions hedged into USD. Eligible transactions are definitive takeovers in developed markets with deal value above USD 200 million, compensation in cash, stock, or both, and a calculable per-share deal value. Deals must be less than 365 days from announcement and offer a positive spread above USD 0.01; older deals must also clear a risk-free-rate hurdle based on a 30-day annualised spread. Position sizes are constrained by free float (≤5% of float), trading liquidity (≤33% of average daily volume, tighter at entry), and transaction-level loss limits calibrated to 50–200 basis points of NAV impact. Long positions use a liquidity-tiered scheme with 0.25–8% name caps and 25% sector caps, while matching acquirer shorts reflect stock consideration ratios. The index reconstitutes and rebalances twice monthly, sending completed deals to cash.

ETF Details

Key Facts

Issuer:
Altshares
AUM:
$102.0m (as of Aug 31, 2026)
Net Expense Ratio:
75 bps
Inception Date:
May 5, 2020
Index:
Water Island Merger Arbitrage USD Hedged Index
Dividend Frequency:
Annually

Trading

Ticker:
ARB
Exchange:
NYSE Arca Exchange
ISIN:
US02210T1088
Trading Currency:
USD
Domicile:
United States

Classification & Risk

Asset Class:
Alternative
Asset Region:
Global
Theme:
Hedge Fund
Economic Development:
Global Markets
1 Year Volatility:
4.66%
3 Year Volatility:
3.66%
5 Year Volatility:
4.67%

Performance

TTM Dividend Yield:
0.44% (verify with issuer)
1 Month Performance:
0.89%
3 Month Performance:
1.17%
6 Month Performance:
2.24%
1 Year Performance:
4.32%
3 Year Performance:
16.31%
5 Year Performance:
22.69%
Investment Proposition

AltShares Merger Arbitrage ETF (ARB) delivers a focused merger-arbitrage strategy centered on announced corporate transactions, typically buying targets and using hedges to dampen market exposure, with the aim of earning deal-closing spreads independent of broad equity direction. The process emphasizes position sizing by deal risk, timeline, and structure, with diversification across sectors and geographies to reduce idiosyncratic exposure. Returns are driven by the cadence and quality of announced deals, regulatory outcomes, financing conditions, and market liquidity; spreads can compress when conditions are benign and expand when perceived break risk rises, creating cyclical opportunities and drawdowns. Within portfolios, ARB can operate as a satellite absolute-return sleeve, a concentration hedge against equity beta, or a tactical allocation during active M&A cycles. Investors most likely to employ the fund include institutions and advisors pursuing alternative sources of return with historically modest correlation to traditional assets. The strategy tends to be resilient when deal flow is steady and acquirer funding is accessible, but it can be challenged by hostile reviews or shifting policy signals. A fund-specific risk to monitor is deal-break exposure, where failed transactions can cause abrupt single-name losses.

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