OpenAI Fires an Employee for Prediction Market Insider Trading

February 27, 2026 Kate Knibbs

Prediction markets like Polymarket and Kalshi are big business, and some Big Tech employees are testing boundaries by making trades based on insider knowledge.

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What's an E-Bike? California Wants You to Know
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Everything Larry and David Ellison Will Control If Paramount Buys Warner Bros.
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Paramount Skydance’s sprawling media empire will get a major boost if the deal is approved.