The son of the U.S. president has turned the competition between two prediction market giants into his own personal insurance. The venture fund 1789 Capital, linked to Donald Trump Jr., invested $300 million in Polymarket, while Trump Jr. himself holds a paid advisory position and owns a stake in a direct competitor—the Kalshi platform. This arrangement guarantees him a profit regardless of who emerges victorious in this battle.
The $300 million investment was made as part of a Polymarket funding round that valued the platform at $1 billion. After this capital raise, Polymarket's valuation soared to an impressive $21 billion. Trump Jr. acquired his stake in Kalshi back in 2025, when the company was valued at a relatively modest $300,000. Since then, Kalshi's market capitalization has grown to $22 billion, making the investor's position even more substantial.
An advisor with two chairs
In January 2025, Trump Jr. took on the role of paid strategic advisor at Kalshi. Just seven months later, he joined the advisory board of Polymarket—it was then that 1789 Capital first invested in the project. Now the president's son is tied to the two largest U.S. event betting platforms through both money and official obligations. Both companies are fiercely competing for the same audience and the same set of market rules.
Such a dual role inevitably raises questions about ethics and conflicts of interest. At Kalshi, however, they were quick to assure that Trump Jr. is exclusively involved in marketing strategy and does not advise on regulatory matters. In practice, his influence extends much further.
Direct contact with regulators
According to information available to me, Trump Jr. personally urged Republican attorneys general to stop pressuring event betting platforms. He voiced this position in March at a closed meeting in New Orleans. In his words, the campaign against such platforms was initiated by traditional gambling companies seeking to protect their own business from this new form of competition.
The Commodity Futures Trading Commission (CFTC) this year filed lawsuits against nine states to prevent them from regulating betting markets at their own level. Eight of these states are led by Democratic attorneys general. The situation has become most acute in Arizona, where criminal charges were filed against Kalshi in March for illegal gambling services.
Trump Jr.'s dual role has landed at the very center of this struggle. Should Kalshi or Polymarket lose in any state, the blow would hit both businesses he is connected to. This creates a unique situation where his personal financial interests are directly intertwined with the regulatory fate of an entire industry.
Separately, U.S. President Donald Trump himself has supported the industry. In May, he called betting markets a new financial product and stated that CFTC oversight over them must be maintained. Thus, his son's interests in the leading platforms have become part of a broader dispute over market regulation.
My analysis: Such intertwinements of interests are a troubling signal for the market. When an advisor and investor simultaneously represents two competing platforms and has direct access to regulators, a systemic risk arises that could undermine trust in the transparency of the entire prediction industry. Investors should closely watch how events unfold in Arizona and other states—the outcome of these legal battles will determine not only the fate of Kalshi and Polymarket but also the boundaries of what is permissible for the entire sector.