Susquehanna and Cantor enter prediction markets from opposite sides

Two institutions walked into the same room last week from different doors, and the gap between them explains more about where prediction markets are heading than anything the CFTC said at its roundtable.

Cantor Fitzgerald arrived as broker. The investment bank is now arranging block trades in event contracts on Kalshi, with Susquehanna Predictions on the other side providing pricing and liquidity. The architecture is familiar to anyone who has spent time in structured products: an introducing broker, a dedicated market-maker, institutional clients who want size without moving the market. What is new is the underlying product.

Susquehanna has long been one of the more sophisticated options houses in the world. Options pricing is, at its foundation, a probability problem — you are buying or selling a distribution, not an asset. Event contracts are the same problem with a binary payoff and a defined resolution date. The move is not a leap for them. It is a horizontal step into a market where the competition is thinner and the mispricings are, for now, larger.

The Cantor side is more interesting to me. Introducing brokers do not take risk. They earn on flow. For Cantor to build infrastructure around Kalshi block trades, they need to believe the flow is coming — that institutional hedge funds and asset managers will want event contract exposure at size. That belief is a bet on legitimacy, and Cantor is not a firm that makes that bet carelessly.

Here is where I diverge from how this has been framed elsewhere. The entry of Susquehanna and Cantor is being read as a validation story — Wall Street blesses prediction markets, liquidity deepens, the asset class matures. I think that reading is incomplete. What Susquehanna's arrival actually does is compress the edge available to the market's current participants. The retail traders and smaller funds who have been operating in a relatively inefficient market are about to find prices getting tighter in the contracts where Susquehanna chooses to make markets. That is good for price accuracy. It is not uniformly good for everyone who is currently profitable.

The contracts where this matters first are the ones with clear resolution conditions and near-term dates — election outcomes, Fed decisions, economic data releases. These are exactly the contracts where binary options pricing expertise transfers most directly. I have traded against well-capitalized options desks before, in a different context. The experience concentrates the mind.

What the CFTC makes of all this is a separate problem. The manipulation concerns raised at the roundtable were directed mostly at mention markets and thinner contracts. Institutional block trading in well-defined event contracts is closer to what the CFTC already oversees in listed derivatives. Cantor and Susquehanna are not arriving to fight the regulator — they are arriving because the regulatory trajectory, whatever its remaining uncertainty, has moved far enough toward legitimacy to justify the infrastructure investment.