M&A
Block Trade
Definition
A large transaction negotiated privately away from the order book and then reported to the exchange, available only to eligible participants such as financial institutions, regulated insurers, funds and parties above an asset threshold.
Why it matters
Block trades exist because executing a very large order through a public order book moves the price against the person doing it. Negotiating off exchange and reporting afterwards gives size without that penalty, and the eligibility threshold keeps retail participants out of a mechanism designed for institutions.
In prediction markets the block trade tier has become the clearest evidence that event contracts can do real economic work. Insurers carrying contingent liabilities that vary with sporting outcomes, such as performance bonuses owed by clubs and universities, have used blocks to lay off that exposure, structuring several legs to match a payment schedule. That is hedging in the ordinary sense, performed by a regulated counterparty against a genuine underlying risk.
It also draws an awkward line through the sector. The hedging justification applies to the institutional tier and says very little about a retail customer trading a short-dated contract with no underlying exposure at all.
The bottom line
A block trade is how institutions transact size without moving the market. Where prediction markets are concerned, it is also where the hedging argument is strongest and narrowest.