Merger Arbitrage: Spread Capture in Announced Deals

The single most-important number in merger arb is the BREAK FEE -- the contractually-disclosed amount the target must pay the acquirer if the deal fails. Break fees typically run 1-3% of deal value. A LARGE break fee (say, 4%+ of deal value) signals the target board's confidence and creates economic incentive to resist competing bids. A SMALL break fee (under 1%) signals the target board kept optionality. Merger arbs read break fees carefully; the market often misprices the signal.

Antitrust risk is the single biggest unpriced spread component in 2024-2026 deals. The FTC and DOJ under recent leadership have challenged more deals than in the prior decade (visa-Plaid, Microsoft-Activision, JetBlue-Spirit). Spreads in pharma, big-tech, and concentrated-industry deals reflect this uncertainty even when both boards have approved. Reading the HSR antitrust filings is the merger-arb edge most retail investors skip.

Retail merger arb has STRUCTURAL DISADVANTAGES vs institutional arbs. Pros: brokerage cost is similar at retail vs institutional scale on liquid names. Cons: (1) institutional arbs read SEC filings within minutes; retail reads them next day; (2) merger-arb funds carry deal-broken positions across hundreds of deals so single-deal failures don't impair the portfolio -- retail concentrating in one deal eats the full downside; (3) shorting the acquirer in stock deals requires margin + locate -- not always available at retail.

Merger arb captures the deal spread between announcement and closing. The spread compensates for time value + residual deal-fail risk. Break fees and antitrust filings are the substrate signals to read. Retail can play arb on liquid deals but should diversify across multiple deals to absorb single-deal failures.