# Warren and Curtis Ask Kalshi, Polymarket About Election Controls By Riza Dagoc Canonical URL: https://www.tokenpost.com/news/regulation/45205 Published: 2026-10-30T22:45:17.000Z Updated: 2026-10-30T22:45:17.000Z Section: Regulation > Their Oct. 29 letter seeks details on insider trading, manipulation and bets based on material nonpublic information, with responses due Nov. 3. Sen. Elizabeth Warren, the Senate Banking Committee’s ranking member, and Sen. John Curtis asked Kalshi and Polymarket to explain how they guard election markets against insider trading and manipulation. The senators sent the request Oct. 29 to Kalshi CEO Tarek Mansour and Polymarket CEO Shayne Coplan. They want details on how the companies prevent trades based on material nonpublic information and handle suspicious activity tied to election contracts. Responses are due Tuesday, Nov. 3, Election Day. The senators said election contracts receive prominent coverage and some observers regard them as signals of political momentum. “We are particularly troubled by election-related event contracts,” Warren and Curtis wrote. The letter points to candidates who traded on their own Kalshi races, apparent trading-volume manipulation on Polymarket and accounts of campaign staff placing bets before unreleased polling. Those examples raise questions about platform controls but do not establish a regulatory finding of illegal insider trading. In February, the Commodity Futures Trading Commission (CFTC) said a candidate’s 2025 trades on his own Kalshi race potentially violated the Commodity Exchange Act and agency regulations. The candidate acknowledged knowing the trades were improper under Kalshi’s rules. Kalshi imposed a $2,246.36 total sanction, comprising $246.36 in disgorgement and a $2,000 penalty, and suspended the trader for five years. Kalshi disclosed three additional candidate cases in April, involving Minnesota’s 2nd Congressional District, Texas’ 21st Congressional District and the Virginia Democratic Senate primary. It reported fines of $539.85, $784.20 and $6,229.30, respectively, with five-year suspensions in each case. Kalshi said it referred none of the three cases to the CFTC or the Justice Department. Shana Bautista, Polymarket’s head of global intelligence and investigations, said Oct. 27 that the company had investigated dozens of bets tied to the midterms. “If you have information that you have a duty to protect, don't trade on it,” Bautista said. The request adds congressional scrutiny to Polymarket’s [midterm betting investigations](). The letter also cited accounts of campaign staff betting before unreleased polling. Its examples raise concerns but do not establish a regulatory finding of illegal insider trading. The senators’ request seeks information and does not announce an enforcement action against either company. ## Links in this article - [midterm betting investigations](https://www.tokenpost.com/news/regulation/41840)