Kalshi Ends Donald Trump Jr.'s Advisory Role After 1789 Capital Backs Polymarket

Kalshi has terminated Donald Trump Jr.'s advisory contract after his venture capital firm, 1789 Capital, deepened its investment in rival prediction market platform Polymarket. Reuters reported the split on Thursday, citing a company spokesperson, and Kalshi framed the exit as mutual rather than forced.

The decision follows a direct conflict of interest. 1789 Capital led Polymarket's latest funding round, and discussions about ending Trump Jr.'s advisory agreement began in August, according to the spokesperson.

"We have mutually agreed to end Don's advisory role after his firm's significant investment in a competitor this past summer," the spokesperson said. "We are grateful for his contributions in helping us market Kalshi to more customers."

How the Kalshi-Trump Jr. deal was structured

Trump Jr. joined Kalshi as a strategic advisor in January 2025. The appointment came with an equity stake that the Financial Times reported was worth approximately $300,000 at the time.

The timing was no accident. Kalshi brought him on shortly after the 2024 US presidential election, a cycle in which prediction markets gained mainstream prominence by forecasting Donald Trump's victory even as traditional polling pointed elsewhere.

That forecasting moment turned platforms like Kalshi and Polymarket into household names among traders, policymakers and journalists. Advisory hires with political connections followed.

What does this change for Kalshi?

For Kalshi, the operational impact looks limited. Trump Jr.'s role was strategic and marketing-oriented, not operational, and the spokesperson's statement credits him mainly with customer-facing outreach. The company, which Reuters describes as a $40 billion prediction market operator, keeps its core business intact.

The reputational calculus is different. Cutting ties with a high-profile advisor over a rival investment draws a clean line around Kalshi's governance at a moment when the entire sector is under congressional scrutiny. It signals the operator takes competitive conflicts seriously — at least visibly.

For Polymarket, the episode is a quiet win. A firm run by a prominent political figure has now put capital behind it and led a funding round, even as the rivalry with Kalshi intensifies across event contracts.

Congressional pressure is building

The contract termination lands against a hostile regulatory backdrop for the sector. Prediction markets face increased scrutiny from Democrats in Congress. Senator Elizabeth Warren has pledged to crack down on insider trading involving prediction market platforms.

Warren's focus matters because prediction markets occupy a gray zone between financial trading and gambling, with event contracts that can reward traders who hold material non-public information. A congressional push on insider trading could force operators to adopt surveillance and disclosure standards closer to those of traditional exchanges.

That is the real stakes here. Kalshi just showed it will act quickly when an advisor's incentives diverge from its own. The harder test will be proving to lawmakers that its markets can police trading conduct as cleanly as it policed this contract.

With Warren's crackdown pledge still pending and competition between Kalshi and Polymarket escalating, expect governance and compliance moves — not just marketing hires — to define the next phase of the prediction market industry.