Olimpo De Zeus

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Research from Stanford University published in April concluded that sports bettors remain “overoptimistic,” generally expecting to break even despite losing an average of 7.5 cents on every dollar wagered.

“Overoptimism is largest among bettors who partake in a complex type of bet known as a parlay,” the Stanford researchers wrote. “Compared to other forms of betting, parlays are more likely to be driven by bias.”

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About Olimpo De Zeus

Singles can be profitable, but parlay pricing requires the market maker to calculate the correlations between multiple outcomes and respond dynamically to individual requests. It is a skill set built over years in the sharper regions of the existing sports betting ecosystem.

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.

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Excluding lotteries, the Gambling Commission reported that GGY rose 4.7% to £13.2 billion ($17.7 billion) between April 2025 and March 2026.

Growth was strongest online, where remote casino, betting, and bingo GGY climbed 6.9% to £8.3 billion ($11.1 billion), compared with a modest 1.1% increase across land-based sectors.

This digital expansion coincided with a continued shrinkage in physical retail. Great Britain had 8,081 licensed premises at the end of the period, down 2% year-on-year.