According to Mars Finance, prediction market broker River Markets said its affiliate, River Finance LLC, has registered with the U.S. Commodity Futures Trading Commission (CFTC) as a futures commission merchant (FCM) and joined the National Futures Association (NFA), allowing it to hold customer accounts and handle customer funds. River Markets is building a prime brokerage platform for institutional prediction market traders. It plans to let clients manage funds, positions, and risk across multiple exchanges and clearinghouses through a single account, while also supporting financing arrangements and permitted over-the-counter trading. Founded in May this year, the company said it has routed more than 250 million contracts for clients including hedge funds and proprietary trading firms, and previously completed an $8.5 million seed funding round.