1. Kalshi and Trump Jr. part ways over a Polymarket conflict
Kalshi, the prediction market a company spokesperson described as a $40 billion startup, has ended Donald Trump Jr.'s advisory role, the company confirmed on November 12. The spokesperson said the split was mutual and followed a significant investment by Trump Jr.'s venture firm, 1789 Capital, in rival Polymarket, a $1 billion round that valued that company at about $21 billion.
The decision closes an unusual chapter in which the eldest son of President Donald Trump held advisory ties to both of the largest competitors in the US prediction market industry at the same time. Kalshi had brought him on as a strategic advisor in January 2025, and he later joined Polymarket's advisory board when 1789 Capital first invested in that company.
In its statement, Kalshi thanked Trump Jr. for helping the company market itself to a wider set of customers. Polymarket and Trump Jr. did not immediately respond to requests for comment.
2. Why did Kalshi end the Trump Jr. advisor contract?
Kalshi ended the contract because 1789 Capital, the venture firm where Trump Jr. is a partner, made what the company called a significant investment in a competitor this past summer. The spokesperson said both sides agreed to end the arrangement.
According to the spokesperson, talks about winding down the advisory contract began in August, after 1789 Capital led Polymarket's most recent funding round. That round raised $1 billion and valued Polymarket at roughly $21 billion.
The sequence matters. Trump Jr.'s dual role had been public for more than a year, and Kalshi had not cut ties when he joined Polymarket's advisory board. What changed, in the company's account, was the scale of the commitment: a lead position in a billion-dollar raise for the company Kalshi competes with most directly.
3. How Trump Jr. came to advise both prediction market rivals
Kalshi named Trump Jr. a strategic advisor in January 2025. At the time, his stake in the company was reported to be worth $300,000.
His connection to Polymarket followed later that year. In August 2025, 1789 Capital made its first investment in Polymarket, and Trump Jr. joined the company's advisory board.
For more than a year afterward, Trump Jr. held advisory positions at both companies, an arrangement that drew attention because the two businesses compete head-to-head for users, trading volume and regulatory goodwill. Kalshi's latest statement indicates that the arrangement became untenable once his firm stepped into a lead investor role at Polymarket.
4. What are Kalshi and Polymarket?
Kalshi and Polymarket are prediction markets: platforms where users trade contracts whose payout depends on whether a real-world event happens. A contract on an election, an economic data release or a sporting outcome might pay out a fixed amount if the event occurs and nothing if it does not, so its trading price can be read as the market's estimate of the probability.
The two companies have taken different routes to the market. Kalshi operates as a federally regulated exchange in the United States, overseen by the Commodity Futures Trading Commission, which supervises derivatives markets. Polymarket built its business on blockchain rails, with trades settled in stablecoins, and it has become one of the most widely watched crypto-native applications.
Prediction markets rose to prominence during the 2024 US presidential election, when their pricing pointed toward a Trump victory while many traditional opinion polls showed a closer race. Kalshi has promoted the accuracy of its markets and criticized pollsters and traditional media for failing to anticipate what it called Trump's decisive win.
Both companies have since grown rapidly, attracting large funding rounds that have pushed their valuations into the tens of billions of dollars. That growth has raised the stakes of every competitive advantage, from marketing reach to political relationships, and made questions about overlapping loyalties harder to ignore.
5. The scale of the Polymarket round
The financing that set the exit talks in motion was large even by the standards of a fast-growing industry. A $1 billion raise at a valuation of about $21 billion puts Polymarket among the most valuable companies built on crypto infrastructure, and leading such a round typically gives the lead investor a strong voice in setting terms and a close relationship with the company's leadership.
That is the context in which Kalshi's spokesperson described 1789 Capital's move as a significant investment in a competitor. A lead role is a far deeper commitment than a passive stake, and it ties the investor's returns directly to the rival's ability to win market share.
Kalshi's own valuation, which the spokesperson put at $40 billion, shows how much is at stake in the competition between the two companies. With both businesses valued in the tens of billions of dollars, the question of who advises whom carries commercial weight well beyond a single contract.
6. Why the split matters for Kalshi and Polymarket
Advisory roles at fast-growing startups often involve access to plans that competitors would like to see: marketing strategies, product priorities and growth targets. When an advisor's own firm leads a major financing for a direct rival, the potential for a conflict of interest becomes difficult for either company to manage, even when no one alleges misconduct.
Kalshi's statement avoided any suggestion of wrongdoing. Instead it framed the departure as a mutual decision and credited Trump Jr. with helping the company reach more customers. That framing allows Kalshi to remove a source of potential conflict while keeping the relationship cordial.
For Polymarket, the change leaves Trump Jr.'s ties running in one direction. He remains on its advisory board, and his firm led its most recent funding round. For Kalshi, the departure means giving up an advisor it credited with marketing value, at a time when competition between the two platforms is intense.
7. How advisory conflicts are usually handled in venture-backed companies
Startups routinely bring on advisors who bring reach, relationships or credibility, often compensating them with a small equity stake rather than cash. The arrangement aligns the advisor's interests with the company's success: if the business grows, the stake becomes more valuable. Trump Jr.'s Kalshi position, with a stake reported at $300,000 when he joined, fits that familiar pattern.
The same structure is what makes conflicts sensitive. An advisor who holds equity in one company and whose firm leads a large financing for its closest competitor has a financial interest on both sides of the rivalry. Even if the advisor keeps information carefully separated, the companies involved, their investors and outside observers can reasonably question whose interests are being served in any given conversation.
Companies typically address such situations in one of a few ways: by limiting what the advisor can see, by asking the advisor to step back from certain discussions, or by ending the relationship. Kalshi's spokesperson described the last of those outcomes, reached by mutual agreement after conversations that began in August.
The months between the start of those talks and the public confirmation suggest a negotiated exit rather than an abrupt break. Winding down an advisory contract can involve settling the terms of any equity already granted and agreeing on how the change will be communicated, steps that take time when both parties want an orderly separation.
8. Political scrutiny of prediction markets grows
The split comes as prediction markets face the prospect of tougher oversight in Washington. Democrats in Congress have signaled closer scrutiny of the sector, and Senator Elizabeth Warren, a Massachusetts Democrat and longtime critic of the crypto industry, has vowed to crack down on insider trading on these platforms.
Insider trading is a particular concern for event contracts because some outcomes, such as government decisions or corporate announcements, may be known in advance to a small group of people. If those people can trade on that knowledge, the integrity of the market and the fairness to other traders comes into question. That issue has made the political connections of prediction market companies a natural focus for lawmakers.
Trump Jr.'s ties to both companies had placed him near the center of that debate. Ending his Kalshi role reduces one of the overlaps that critics had pointed to, though his relationship with Polymarket and 1789 Capital's investment in that company remain in place.
9. What comes next
Neither Polymarket nor Trump Jr. had commented on the Kalshi decision when it was confirmed, so it is not yet clear whether his role at Polymarket will change in response.
The timing also places the announcement alongside a shifting political landscape. As Democrats in Congress prepare to examine prediction markets more closely, any remaining overlap between the Trump family's business interests and the companies that run these platforms is likely to stay in view. Kalshi's decision removes its own exposure to that overlap, while Polymarket's continued ties to Trump Jr. and 1789 Capital mean the spotlight on that relationship is unlikely to fade.
For Kalshi, the next test is how it competes for users without an advisor it publicly credited with expanding its reach. For the broader prediction market industry, the more consequential question is how lawmakers who have promised to examine insider trading and political ties approach the sector as both leading platforms continue to raise capital at multibillion-dollar valuations.
Whatever happens next, the episode shows how quickly the prediction market industry has matured. Two companies that began as niche experiments are now large enough that the identity of their advisors and the source of their funding are treated as matters of competitive and political significance, and that the end of a single advisory contract draws national attention.