Polymarket raises $300 million from the Trump Jr. fund amid a U.S. legal dispute over prediction-market regulation

The prediction markets platform Polymarket raised $300 million from the 1789 Capital fund, as part of a new financing round that brings the total to roughly $1 billion, according to the Wall Street Journal citing informed sources. The move is intended to bolster the investment fund’s bet, which includes Donald Trump Jr., after the fund previously injected $200 million into the platform, as well as financing other controversial tech projects such as “enhanced games” focused on unconventional sports competitions founded by tech entrepreneurs.

Prediction markets are shifting from emerging digital trading platforms to a broad political and legal battleground between federal authorities and U.S. states.These platforms are facing escalating regulatory scrutiny as state governments seek to impose new rules governing how residents use the sites, or even to ban them outright. At least twenty states are engaged in direct lawsuits against prediction platforms over the sports betting offered on them, while the federal government is stepping in to defend the sector and shield it from local restrictions.

The Trump administration takes the position that the only body authorized to regulate the sector is the U.S. Commodity Futures Trading Commission, not individual state governments. In this context, the commission has filed lawsuits against at least nine states in response to their attempts to impose local regulations on the platforms. Conversely, a coalition of 44 state attorneys general issued a statement asserting that the federal commission lacks legal authority to oversee sports betting within prediction markets, entrenching a complex judicial split over the limits of regulatory sovereignty.

Platform supporters are seeking to establish a unified federal oversight that would protect prediction models and prevent the fragmentation of financial liquidity across states.Donald Trump Jr. appeared at an event that included conservative attorneys general, describing the prediction sector as already under strong and solid oversight, and emphasizing that the platforms are monitored by federal officials rather than state attorneys general, reflecting an effort to rally political and legal cover for the platform and its multibillion-dollar investments.

For investment firms, fintech entrepreneurs and compliance teams in the Gulf, Egypt and the Levant, this landscape carries direct practical implications. The flow of hundreds of millions backed by direct U.S. political support turns prediction platforms into heavyweight financial infrastructure, forcing regional investors to reassess the viability of foresight markets and probabilistic pricing. Moreover, the U.S. clash between federal and state regulation offers a clear lesson for compliance units and startups in the region building risk-pricing platforms or trading tools, as regional expansion requires a precise understanding of the divide between central licences and each country’s local legislative constraints to avoid complex regulatory disputes.