What it is
Merger arbitrageurs buy shares of a target company after a takeover announcement, hoping its stock price will rise to the acquisition price offered by the acquirer once the deal closes. They may also short sell the acquirer's stock if the deal is all-stock. The profit comes from the spread between the target's current market price and the announced offer price, which exists due to the risk that the deal might not close, or could be delayed.
Merger arbitrage is a common strategy employed by hedge funds and institutional investors, and its activity can signal market confidence in a deal's completion. News of a merger or acquisition immediately creates an arbitrage opportunity, and the size of the spread can indicate perceived risk. Retail investors might observe these spreads to gauge market sentiment on specific M&A deals, as a widening spread suggests increased doubt about the deal closing.
Why it matters
This strategy provides insights into the market's perceived risk of a merger failing, which can impact the stock prices of involved companies.
Reviewed under editorial standardsUpdated September 26, 2026Not investment advice