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River Markets
ActivePrime brokerage for prediction markets
P26·Spring 2026·Fintech·San Francisco, CA, USA·Team of 2·Founded 2026
About
River Markets is the prime brokerage for prediction markets. We aggregate every major event-contract venue into one account, giving professional traders best execution, portfolio and order management systems, and a unified API.
Founders
Oscar Levy· Co-FounderCo-Founder at River Markets. Previously quant at BlackRock managing models trading $6B, Sandbar Asset Management ($2B AUM hedge fund). MA Financial Engineering from UC Berkeley.
Antonin Parrot· FounderCo-founder of River Markets, the prime broker for prediction markets. I have a background in engineering and CS, and I've been working as a quant at a high frequency option market making trading shop.