Every round on record, with the sources behind each and the investors on them.
River Markets provides a trading platform for hedge funds and professional traders focused on prediction markets.
rivermarkets.comLinkedInSan FranciscoFintechYC X26Founded 20262 people
6 sources
Sources agree on the $8.5M seed round led by Haun Ventures. Fortune is the most specific source and fixes the announcement date as August 11, 2026; its article says the round closed in July. Angel employers named in the sources were not counted as investors because the individual angels were not identified.
| Round | Amount | Announced | Lead | Buzz |
|---|---|---|---|---|
| Seed [ REPORTED LATER ]: This round was announced before Fireround first saw it. It stays in the company's history, not in Latest, Trending, or alerts. | $8.5M | 2026-08-11 | Haun Ventures | No recent discussion |
6 sources [ VERIFIED ] read against 6 sources Sources agree on the $8.5M seed round led by Haun Ventures. Fortune is the most specific source and fixes the announcement date as August 11, 2026; its article says the round closed in July. Angel employers named in the sources were not counted as investors because the individual angels were not identified. | ||||
River Markets is an execution and portfolio-management platform that gives hedge funds, proprietary trading firms, and professional traders one terminal and API for trading across prediction-market venues.
LinkedIn via Alexandria from ycombinator.com
Prediction-market trading is fragmented across venues with separate accounts, APIs, balances, and risk systems, so River's unified terminal/API and smart routing target the infrastructure gap that the founders say is holding back professional capital. Its $8.5 million seed led by Haun Ventures is funding faster, more secure systems and expansion of sales and operations while the company reports $50M+ traded, use by three of the top 10 traders on Kalshi and Polymarket, and a goal of hundreds of millions of dollars in annualized volume.
Checked against 10 sources on Sep 23
Also named as backers in company research: UFO Holdings, TENET, Humbition, Kima Ventures, Cherry Ventures, Stack Asset Management, Perpetual Strategies, Mark Kornfilt, Jacob Fortinsky (Novig), angel investors from Citadel, angel investors from Google, angel investors from HRT, angel investors from Tower Research Capital, angel investors from NVIDIA, angel investors from FalconX, angel investors from Exodus Point, angel investors from JP Morgan