Kalshi and Donald Trump Jr. Part Ways Over His Firm's Bet on Rival Polymarket

Donald Trump Jr. is no longer a paid adviser to Kalshi, the fast-growing prediction market company said Thursday, ending a relationship that began shortly after his father returned to the White House in January 2025. Kalshi tied the decision to his venture firm's growing investment in its chief rival, Polymarket.

Kalshi spokesperson Dani Lever said the two sides "mutually agreed to end Don's advisory role" after his firm's significant investment in a competitor this past summer, The Hill reported. Lever also thanked Trump Jr. for his work. "We are grateful for his contributions in helping us market Kalshi to more customers," she said, according to the Associated Press.

The AP reported that 1789 Capital, Trump Jr.'s venture firm, increased its investment in Polymarket in August as part of Polymarket's latest fundraising round, and that the move started the conversation about ending the Kalshi role. Trump Jr. has been an investor in Polymarket since August 2025, the AP reported. The New York Post, citing Reuters, described Kalshi as a $40 billion startup.

In plain terms, a man with a financial stake in one company stopped advising its biggest competitor. Kalshi publicly thanked him on the way out, hardly the tone of a firm distancing itself from wrongdoing. That is how conflicts of interest are supposed to be handled in business, and it is worth saying clearly before the story is spun into something else.

The Financial Times framed the split against the Democrats' midterm sweep and mounting political scrutiny of the industry. Democrats, who won control of the House and Senate last week, have said they plan to investigate the Trump family's investments, including its business relationships with both prediction markets, the AP reported.

Both companies have received favorable treatment from the administration, the AP reported, noting that the Commodity Futures Trading Commission has backed the industry's push to expand nationwide, including letting customers trade sports-related contracts. But both Kalshi and Polymarket have firmly denied that their financial ties to the Trump family affected how the industry is regulated.

Kalshi's chief executive, Tarek Mansour, has addressed the question head-on. He told MS NOW in October that Trump Jr.'s role presented an "optics issue," but he said Kalshi has never used the president's eldest son to win favor with the administration.

Prediction markets let customers buy and sell contracts tied to real-world outcomes, from elections to sports. With federal regulators backing the industry's nationwide expansion, including sports-related contracts, the stakes in the contest between Kalshi and Polymarket keep rising.

For the industry, the bigger question is not who sits on an advisory board but what rules will govern it once a Democratic Congress arrives. Lawmakers who want to rein in sports contracts or tighten oversight now have a political hook, and they are likely to use hearings to press the companies on their Washington connections. Investors should watch whether that scrutiny turns into rules that slow the industry's growth, or whether lawmakers settle for headlines. A clean separation like this one gives Kalshi a simpler answer when those questions come.

For consumers, the lesson is the one every market eventually teaches: competition and transparency are the best protections. Kalshi's decision to separate itself from a rival's investor, and to say so publicly, is a step in that direction.

Expect the Trump family's business ties to be a target when the new Congress convenes in January, as Democrats have promised. Trump Jr.'s side had not publicly responded to Kalshi's announcement in the initial reports. Polymarket, meanwhile, keeps an investor with a famous last name, and Kalshi keeps its focus on growth. In a market that runs on predictions, the safest bet is that Washington is not done asking questions about either company.