How to Start a Merger Arbitrage Fund

A merger arbitrage book earns a modest annualized spread on each position — commonly 3% to 8% on an announced deal — and does it repeatedly. Because individual spreads are thin, the temptation is to lever the book to reach an attractive headline return, and leverage applied to a strategy with sharp left-tail events is how merger arbitrage funds fail rather than underperform.

Allocators know this, so they will go straight to your risk framework. State the maximum position size as a share of the fund, whether sizing varies with assessed break risk, the maximum gross and net exposure, and what the fund does when a deal is challenged. A stated rule — that a position is cut on an antitrust second request, for instance — is worth more in diligence than a wider historical return.

Deal break rates historically run in the low single digits, and most failures happen for identifiable reasons: antitrust objection, a foreign investment or national security review, financing falling through, a shareholder vote failing, or a material adverse change claim. Each is analyzable, and the quality of a merger arbitrage manager largely comes down to whether they assess these better than the spread implies.

Your process document should say how you evaluate antitrust exposure, what you do with deals under active review, whether you take positions in transactions facing cross-border approval, and where your legal and regulatory research comes from. Allocators will ask about the last deal you owned that broke — which is a fair question, because everyone who has run this strategy long enough has one.

The number of announced deals large and liquid enough to build a meaningful position in is finite, and it varies with the merger cycle. In a slow year the opportunity set shrinks and a fund with too much capital either sizes positions beyond its risk limits or holds cash and reports a return that disappoints.

Decide capacity before you raise and put it in writing. A manager who states a hard cap and closes the fund is making a credible claim about the strategy; one who raises against demand tends to discover the capacity constraint in the worst year. Liquidity terms should match: because the book holds announced deals in liquid names, quarterly redemption with reasonable notice is usually deliverable, which is a real advantage over less liquid strategies.

The Fund Builder models the economics — target assets, management fee, incentive allocation, high-water mark, subscription and redemption terms — so the liquidity you promise and the fee accrual you model agree. Legal Canvas prepares the formation and offering documents with your position limits, leverage policy, and capacity cap carried as disclosures for independent counsel review.

Scroll Deck builds the allocator deck from the same record, so the exposure limits in your pitch are the ones in the limited partnership agreement — which, in a strategy defined by tail risk, is the thing diligence is most concerned with.