Equity and Event Strategies · Hedge Funds

Merger arbitrage studies the difference between a target’s market price and the consideration expected if an announced transaction completes. The spread compensates for uncertainty.

Read the terms before the spread

For a simple cash acquisition, the target may trade below the promised cash payment. Investors buying the target seek to earn the gap if closing occurs. Regulatory approval, financing, shareholder votes and contractual conditions can affect completion. An announced deal is not a completed sale.

A transaction paid in shares introduces exposure to the acquirer’s price and the exchange ratio. A manager may use a short position to offset some of that exposure. Collars, elections and mixed consideration make the hedge more complex. Borrowing and transaction costs still matter.

Compare success and failure

Imagine a target trading at $48 with an announced cash offer of $50. Successful completion produces $2 of gross profit per share, or about 4.17% on the purchase price. Suppose the investor estimates a $35 price if the deal fails. The assumed failure loss is $13, much larger than the completion gain.

Using only these two outcomes and ignoring time and costs, the break even completion probability solves p times $2 plus one minus p times negative $13 equals zero. That gives about 86.7%. The calculation is sensitive to the assumed failure price, which is uncertain and can change with the market.

Allow for time and correlated failures

A delay reduces the annualized return from the same dollar spread and can increase financing costs. A narrow spread can therefore be unattractive even when closing appears likely. A portfolio of deals can also share exposure to financing conditions, regulation or a particular buyer.

Record the catalyst, expected timetable, key conditions and evidence that would change the completion assessment. Avoid presenting the quoted spread as an earned yield. It is a possible payoff conditional on events that have not yet occurred.

Try it yourself

A target costs $97, the cash offer is $100 and an assumed failure value is $85. What two outcome completion probability breaks even before time and costs?

Show the worked answer

The gain is $3 and the failure loss is $12. The break even probability is 12 divided by 15, or 80%. A lower failure value would require a higher probability.

Further reading

Educational material, not a recommendation to buy or sell a fund. Numerical examples are hypothetical. Fund terms, investor eligibility and tax treatment vary by product, account and jurisdiction.

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