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Wall Street banks tighten rules on employee prediction market trading amid insider information concerns

Major Wall Street banks are increasingly restricting employee trading in prediction markets, Cointelegraph reported on July 10. Goldman Sachs, Morgan Stanley and Bank of America tightened internal controls over concerns that staff could use non-public information learned at work to trade event contracts on Polymarket and Kalshi. Separately, the insider trading concern has spread into U.S. politics, with a lawmaker proposing a ban on some officials betting on policy and political outcomes.