River Markets, a San Francisco-based startup, raised $8.5 million in seed funding led by Haun Ventures, with participation from Y Combinator, Coinbase Ventures, Qube Research Technologies, and angel investors from Google, Nvidia, Novig, JPMorgan, and Citadel. The company is building a prime brokerage layer for prediction markets, aggregating Kalshi, Polymarket, and Novig into a single institutional trading platform with advanced order types and unified portfolio management. The platform has already facilitated over $50 million in trading volume and claims to support three of the top 10 traders on both Kalshi and Polymarket. Co-founders Oscar Levy and Antonin Parrot bring quantitative finance expertise, with Levy having managed models covering $6 billion in notional value at BlackRock. The funding aims to bridge the gap between regulated venues like Kalshi and crypto-native platforms like Polymarket.
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