Bitter Rivals Unite: Kalshi, Polymarket Back $35M Fund

In a surprising industry alliance, rival CEOs Tarek Mansour of Kalshi and Shayne Coplan of Polymarket have backed 5(c) Capital, a new $35 million venture capital fund launched on March 23, 2026, to boost infrastructure within the exploding prediction markets sector.

An Unlikely Alliance in Prediction Markets

While the competition between Polymarket and Kalshi remains one of the most intense and bitter rivalries in the modern startup ecosystem, the two industry leaders are putting aside their differences to support the broader ecosystem. According to reports by Fortune and Bloomberg, both CEOs have signed on as key investors in 5(c) Capital.

The newly established venture firm, whose name references a specific regulatory clause governing prediction markets, is currently raising $35 million for its inaugural fund. Beyond Mansour and Coplan, the fund has attracted high-profile backing from Marc Andreessen—investing via the Moneta Luna fund—and Ribbit Capital founder Micky Malka. Kalshi has officially confirmed Mansour’s participation in the fund, while Polymarket has not yet responded to requests for comment.

Inside 5(c) Capital: Strategy and Leadership

Targeting Market Infrastructure

According to an investment memo, 5(c) Capital aims to back forward-thinking founders who want to capitalize on the second-, third-, and fourth-order effects of the rapidly growing prediction markets. Rather than launching competing consumer platforms, the fund plans to invest in approximately 20 companies. The primary focus will be on the critical infrastructure supporting the industry, including market makers and index designers.

Led by Industry Veterans

The firm is steered by partners who possess deep institutional knowledge of the sector. The leadership team features Adhi Rajaprabhakaran, a former Kalshi trader, alongside Noah Zingler-Sternig, who previously served as Kalshi’s head of operations.

The Multi-Billion Dollar Race for Dominance

This collaborative investment comes amid a period of astronomical valuation growth for both primary platforms. Kalshi is currently in the process of raising $1 billion at a staggering $22 billion valuation. This figure represents a two-fold increase from its $11 billion valuation achieved less than four months ago.

Simultaneously, chief rival Polymarket is reportedly negotiating a new funding round with investors that would value its decentralized platform at approximately $20 billion, signaling massive institutional confidence in the future of predictive trading.