Tim Olson
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51 lines
3.4 KiB
Markdown
51 lines
3.4 KiB
Markdown
---
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description: "Captures excess returns from merger arbitrage (M&A) by taking long positions in target company stock and, for stock mergers, short positions in the acquirer, exploiting the spread between current and deal prices."
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tags: [stocks, event-driven, merger-arbitrage, risk-arbitrage]
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---
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# Event-Driven — M&A
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**Section**: 3.16 | **Asset Class**: Stocks | **Type**: Event-Driven / Arbitrage
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## Overview
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This strategy, also known as "merger arbitrage" or "risk arbitrage", attempts to capture excess returns generated via corporate actions such as mergers and acquisitions (M&A). When one publicly traded company announces the acquisition of another, a spread typically exists between the target's current market price and the proposed deal price. The trader seeks to profit from this spread closing at deal completion.
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## Construction / Signal
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A merger arbitrage opportunity arises when a publicly traded acquirer announces intent to buy a publicly traded target at a price differing from the target's current market price. Two main transaction types:
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**Cash merger**:
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- Trader establishes a **long position in the target company stock** only.
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- Profit = (deal price − current target price) if the deal closes.
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**Stock merger**:
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- Acquirer offers N_B shares of acquirer stock B for each share of target stock A.
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- Trader **buys 1 share of target A** and **shorts N_B shares of acquirer B**.
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- Example: Current price of A = $67, current price of B = $35, exchange ratio = 2 shares of B per share of A.
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- Initial net credit = 2 × $35 − $67 = $3 per share of A bought.
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- This $3 is the profit if the deal closes.
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- If the deal falls through, the trader will likely lose money.
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## Entry / Exit Rules
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- **Entry**: After public announcement of a merger/acquisition deal, establish the arbitrage position (long target, short acquirer for stock mergers).
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- **Exit — deal closes**: Positions are settled at deal terms; long position in target delivers the deal price; the profit is locked in.
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- **Exit — deal breaks**: Close positions at market prices; the spread typically widens sharply on deal failure, resulting in a loss.
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- **Stop-loss**: Discretionary; deal-break risk is the primary risk.
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## Key Parameters
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- **Deal spread**: Difference between current target price and proposed deal price (or equivalent in stock merger terms)
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- **Exchange ratio (stock mergers)**: Number of acquirer shares per target share
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- **Merger type**: Cash vs. stock merger (determines position structure)
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- **Holding period**: Duration from announcement to deal close (weeks to months)
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## Variations
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- **Long-only (cash merger)**: Buy target only; no short leg.
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- **Dollar-neutral (stock merger)**: Long target, short acquirer in ratio given by deal terms.
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- **Index of deals**: Construct a diversified portfolio across multiple live merger situations simultaneously to reduce single-deal risk.
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## Notes
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- The primary risk is "deal break risk": if the merger falls through (regulatory rejection, board change, financing failure), the trader typically suffers a loss as the target price drops back toward pre-announcement levels.
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- Expected return = (spread × probability of deal close) − (loss on deal break × probability of break).
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- Transaction costs and financing costs for short positions reduce profitability.
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- Holding period depends on deal timeline: typically weeks to several months.
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- This strategy requires monitoring deal-specific news (regulatory filings, shareholder votes, competing bids).
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