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Kalshi and Polymarket rush to ban insider trading as senators move to curb prediction markets

Kalshi and Polymarket banned insider trading and restricted who can trade certain contracts, increasing enforcement after senators proposed legislation threatening their business.

  • On Monday, Kalshi and Polymarket rushed to announce new guardrails after two senators unveiled legislation that could curtail the industry.
  • Earlier this year, industry observers flagged suspicious bets by users who profited from trades ahead of military actions, prompting Polymarket to revise rules amid criticism.
  • Polymarket's updated rules prohibit trading on 'stolen confidential information' and 'illegal tips' and bar those who can influence outcomes, while platforms will review unusual trades, ban wallet addresses, impose fines, or refer cases to law enforcement.
  • The CFTC signaled support for Kalshi, with the agency backing federal preemption in legal fights, as shares of the parent company of FanDuel and DraftKings rose sharply on Monday.
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Prediction market Kalshi reveals new insider trading rules

Prediction market Kalshi revealed new steps aimed at curbing insider trading and market manipulation on its platform.

·San Francisco, United States
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Handelsblatt broke the news in Düsseldorf, Germany on Monday, March 23, 2026.
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