Donald Trump Jr. Departs Kalshi Advisory Role Over Polymarket Investment

Prediction market operator Kalshi has mutually agreed to end its advisory relationship with Donald Trump Jr. after his venture capital firm made a substantial investment in rival platform Polymarket, according to company statements reported by Ars Technica (https://arstechnica.com/tech-policy/2026/11/trump-jr-out-as-kalshi-advisor-after-his-firms-big-investment-in-polymarket/).

The departure follows months of internal deliberations at Kalshi after reports in August 2026 that Palm Beach-based 1789 Capital, where Trump Jr. is a partner, invested $300 million in Polymarket. Trump Jr. had already joined Polymarket's advisory board in August 2025 alongside a smaller seed-stage investment from 1789 Capital. A Kalshi spokesperson stated that leadership reached out to Trump Jr. in the autumn, noting that advising two competing platforms in a rapidly growing sector created operational and strategic friction.

Trump Jr. originally joined Kalshi as a strategic adviser on January 13, 2025, a week before Donald Trump's presidential inauguration. The Financial Times previously reported that Trump Jr. received approximately $300,000 in equity when Kalshi was valued under $2 billion. The company subsequently completed a funding round valuing it at $22 billion and has engaged in talks for fresh financing at a $65 billion valuation. Whether Trump Jr. retains his equity stake in Kalshi remains undisclosed.

Kalshi co-founder and Chief Executive Tarek Mansour previously acknowledged the public scrutiny surrounding the arrangement during a broadcast interview with MS Now, describing it as an "optics issue" while asserting that Trump Jr.'s mandate was confined to brand marketing and public outreach rather than regulatory policy. Kalshi emphasized that Trump Jr.'s social media reach was instrumental in driving platform adoption among retail participants.

The concurrent ties have drawn pushback from federal lawmakers. On November 9, 2026, Democratic Senators Elizabeth Warren and Jeff Merkley sent a formal inquiry to White House Counsel Will Scharf, arguing that the Trump family's financial stakes in commercial prediction markets pose acute conflict-of-interest risks. The senators referenced an August 2026 Commodity Futures Trading Commission (CFTC) enforcement order against former White House teleprompter operator Gabriel Perez, who settled charges for trading Kalshi "mention market" contracts using advance knowledge of presidential speeches, disgorging $107,539.02 in illicit profits and paying a $65,000 civil penalty.

The advisory exit arrives amid an escalating jurisdictional fight between federal regulators and state officials over event contracts. The CFTC, which designated Kalshi as a regulated contract market, filed suit against Arkansas on November 13, marking its eleventh federal lawsuit against states attempting to restrict prediction trading under state gambling laws. Concurrently, state regulators are pushing back: a Louisiana court recently issued a temporary restraining order barring Kalshi, Polymarket, and other market operators from offering prediction contracts within the state pending further litigation.