The two dominant prediction market platforms are both in early-stage fundraising talks that could value each company at approximately $20 billion, according to a Wall Street Journal report — roughly doubling their valuations from just months ago.
Kalshi raised $1 billion in December at an $11 billion valuation, led by Sequoia and CapitalG with participation from Andreessen Horowitz, Paradigm, and others. Polymarket was valued at about $9 billion in October after NYSE parent Intercontinental Exchange agreed to invest up to $2 billion. The discussions are preliminary and may not lead to finalized deals.
The numbers behind the ambition are real. Combined monthly trading volume on Kalshi and Polymarket reached roughly $18.3 billion in February, up from under $2 billion combined as recently as August 2025. Kalshi has crossed a $1 billion annualized revenue run rate, with some estimates placing it closer to $1.5 billion. Open interest on Kalshi is hovering over $400 million, while on Polymarket it sits at $360 million.
The two platforms are taking different paths to scale. Kalshi became the first regulated exchange for event-based markets after receiving CFTC approval in 2020 and operates fully in the United States, offering markets on sports, politics, economic events, and pop culture. Polymarket plans to fully launch a regulated U.S. version of its platform this year. The fundraising push comes with headwinds, though — both firms face an ongoing patchwork of state-level enforcement actions from gaming regulators who view sports prediction markets as unlicensed gambling, alongside mounting insider trading allegations linked to geopolitical contracts.
At $20 billion, the scale of what prediction markets have become is hard to ignore. That figure would put Kalshi and Polymarket well ahead of DraftKings' market capitalization and worth more than every US-listed casino operator except Las Vegas Sands. The fact that both firms are targeting nearly identical valuations underscores how investors view prediction markets as a two-horse race — most fundraising capital in the sector is concentrated in just two platforms rather than spread across dozens, effectively making a duopoly bet.
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