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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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Paired with the recent rise of prediction markets—which allow traders to stake money on everything from sporting events to pop culture outcomes—Americans are risking more money on casino-like activities than ever before.
Buffett has repeatedly raised concerns regarding the mainstreaming of gambling and its marketing under the guise of investing. In May, he targeted prediction markets and traders speculating on short-term instruments like 30-minute bitcoin options.
“If you’re buying or selling one-day options, that is not investing. It is not speculating. It is gambling,” Buffett said during an interview with CNBC. “There’s nobody who can explain why they’re buying an option for one day.”
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The conflict stems back to January 2025, when the outgoing Biden administration initially determined that the Vallejo parcel was eligible for gaming.
Interior temporarily rescinded that determination just two months later after newly appointed Secretary Doug Burgum raised concerns over whether the tribe’s historical connection to the land had been thoroughly evaluated.
Scotts Valley filed suit in response. In October 2025, Judge McFadden ruled that Interior had violated the tribe’s due process rights by rescinding the approval without giving prior notice or an opportunity to respond.
