Kalshi ends Donald Trump Jr.’s advisory role after Polymarket investment

Kalshi confirmed on 12 November that Donald Trump Jr. had left his paid strategic advisory role. Kalshi spokesperson Dani Lever told the Associated Press the two sides had agreed to end the arrangement after his venture firm, 1789 Capital, increased its investment in rival prediction-market company Polymarket over the summer.

The company told Reuters that discussions about ending the contract began in August. Kalshi CEO Tarek Mansour had announced the appointment in January 2025.

Polymarket announced 1789 Capital’s first investment and Trump Jr.’s advisory-board appointment in August 2025. It described both at the company level. The specific legal entity that received the follow-on investment remains unverified.

Reuters reported that Trump Jr. received equity for his work at Kalshi. The exact date his contract ended and the status of that equity have yet to be disclosed publicly. Polymarket and 1789 Capital declined to comment to Reuters. Trump Jr. did not immediately respond to the news agency.