Everything about Risk Arbitrage totally explained
Risk arbitrage, or
merger arbitrage, is an
investment or trading strategy often associated with
hedge funds.
Two principal types of
merger are possible:
In a cash merger, an acquirer proposes to purchase the shares of the target for a certain price in cash. Until the acquisition is completed, the stock of the target typically trades below the purchase price. An arbitrageur buys the stock of the target and makes a gain if the acquirer ultimately buys the stock.
In a stock for stock merger, the acquirer proposes to buy the target by exchanging its own stock for the stock of the target. An arbitrageur may then
short sell the acquirer and buy the stock of the target. This process is called "setting a spread". After the merger is completed, the target's stock will be converted into stock of the acquirer based on the exchange ratio determined by the merger agreement. The arbitrageur delivers the converted stock into his short position to complete the arbitrage.
If that were all there was to it, then everyone would do it immediately, and any possible gain would disappear very quickly. But there's always a risk that the deal won't go through or the closing will be delayed. Obstacles may include either party's inability to satisfy conditions of the merger, a failure to obtain the requisite shareholder approval, failure to receive
antitrust and other regulatory clearances, or some other event which may change the target's or the acquirer's willingness to consummate the transaction. Such possibilities put the risk in the term
risk arbitrage.
Additional complications can arise in stock for stock mergers when the exchange ratio isn't constant but changes with the price of the acquirer. These are called "collars" and arbitrageurs use options-based models to value deals with collars. In addition, the exchange ratio is commonly determined by taking the average of the acquirer's closing price over a period of time (typically 10 trading days prior to close), during which time the arbitrageur would actively hedge his position in order to ensure the correct hedge ratio.
In terms of
hedge fund strategies, risk arbitrage shares some properties with other forms of
arbitrage such as relative value,
volatility arbitrage,
convertible arbitrage, and
statistical arbitrage, but it's also an example of an event driven strategy.
Further Information
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