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Merger Arbitrage

Merger arbitrage is a strategy built around a simple observation: when a company announces it's being acquired, its stock typically jumps toward the announced deal price but rarely trades exactly at it. That gap — the 'spread' — exists because a signed deal isn't a guaranteed deal. It can still fall apart: regulators can block it on antitrust grounds, the financing behind it can fall through, shareholders can vote it down, or the acquirer can walk away if conditions in the agreement aren't met. Merger arbitrageurs buy the target's stock (and, in stock-for-stock deals, often short the acquirer's stock to hedge out market risk) specifically to capture that spread, effectively betting that the deal closes at or near the announced terms. The size of the spread is the market's real-time estimate of deal risk, expressed in dollars. A tight spread on a cash deal with a cooperative regulatory environment signals the market thinks the deal is all but certain to close; the arb return is small but has a high probability of showing up on schedule. A wide spread signals real doubt — maybe the target and acquirer compete closely enough that antitrust regulators are expected to push back, maybe the financing looks shaky, or maybe the timeline is unusually long, which matters because arbitrageurs care about annualized returns, not just the raw spread. A 5% spread that closes in two months is a much better annualized return than the same 5% spread closing in two years. This is why professional arbitrageurs spend most of their time not on the spread itself but on estimating the probability the deal closes at all, and on what price it might close at if terms get renegotiated (which happens more often than most investors assume, usually when financing conditions or business performance change between announcement and close). It's a strategy that looks simple on the surface — buy the target, wait for the deal to close — but is really a probability-and-timing bet dressed up as a simple stock purchase.