Kalshi ends partnership with Donald Trump Jr.'s adviser after his venture firm increases stake in rival Polymarket.

November 13 news, according to reports, the prediction market platform Kalshi has terminated its advisory contract with Donald Trump Jr., the eldest son of U.S. President Donald Trump. A Kalshi spokesperson said that the two parties mutually agreed to end the cooperation because Donald Trump Jr.'s venture capital firm 1789 Capital made a significant investment this summer in competitor Polymarket. Related communications began in August, when 1789 Capital led Polymarket's most recent funding round. Kalshi appointed Donald Trump Jr. as a strategic advisor in January 2025, with equity as compensation.