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Marantelli identifies White Swan and Susquehanna as two firms operating at industrial scale in parlays, with Jump Trading, Mojo and DL Trading among the possible leading group. Below them are numerous smaller syndicates, some managing between $5 million and $10 million, alongside sports-specific specialists.
Enda Kendrick, chief executive of service provider Veltium, similarly says the largest UK and European sharp-betting groups have moved rapidly into US prediction markets. He believes there are also more than 100 smaller operations, ranging from individual traders to teams of around 10, interested in entering the regulated US market.
Yet the presence of professional counterparties complicates the customer-facing idea that prediction markets merely allow users to trade opinions with one another. As Kendrick puts it, two ordinary customers are not going to place $10 million or $20 million behind the Philadelphia Eagles. Markets at that scale require institutions.
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Replacing Miller as treasurer is Ian Angus, director of policy at the UK Gambling Commission where, since 2020, he has been closely engaged in policy development. This includes the Gambling Act white paper and its recommendations on financial risk assessments.
His appointment signals a continuation of UK influence within GREF, even as the Gambling Commission undergoes personnel changes. Ruth Evans was named the new Gambling Commission chair, taking over from Charles Counsell after over a year in the position.
In addition, Olivia Petit has been appointed as board secretary of GREF. Petit is an associate professor at KEDGE Business School, where her research specialises in consumer behaviour in digital environments and emerging technologies.
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The Commission’s annual Gambling Survey for Great Britain (GSGB), released on Thursday, indicated stable gambling participation patterns among 5,277 adults surveyed between January and May 2026.
Around 49% of the adults surveyed said they had gambled within the past four weeks, a figure consistent with previous years.
When excluding those who only played lottery draws, participation stood at 28%, implying lottery-only players comprised roughly 21% of the adult population.
