Wall Street banks tighten prediction market rules for staff as insider fears spread

Wall Street banks, including Goldman Sachs and Morgan Stanley, are restricting employee prediction market trades as insider trading fears spread across Polymarket and Kalshi.

Coming Home GBA LLC, filing. Source: nfa.futures.org

Record Volume Milestones

Polymarket reached a record $713 million in daily taker volume on June 20, according to Dune data. The milestone came more than a week after the World Cup kicked off on June 11.

Kalshi also posted a record monthly trading volume of nearly $9.4 billion in June, as the 2026 FIFA World Cup fueled activity across prediction markets.

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