A Google software engineer was arrested on federal charges after allegedly using confidential internal data to make over $1.2 million by placing bets on the blockchain-based prediction market Polymarket. The allegations reveal how insider trading risks extend into emerging digital asset platforms.
What happened
Michele Spagnuolo, a Google engineer, is accused of exploiting an internal tool late last year to access confidential information on Google’s top-trending search terms of 2025 before their public release. He allegedly used this data to place multimillion-dollar bets on Polymarket, predicting whether specific celebrities would rank among the year’s most searched individuals.
One notable wager involved D4vd, a singer who gained national attention last year in connection with a criminal case. Despite the market initially assessing slim odds for D4vd’s appearance, Spagnuolo correctly bet hundreds of dollars that he would rank among the most searched, profiting substantially after the official “Year in Search” report was published. Shortly thereafter, Spagnuolo’s Polymarket account transferred millions of dollars in cryptocurrency to an external wallet.
Federal prosecutors charged Spagnuolo with commodities fraud, wire fraud, and money laundering. The Commodity Futures Trading Commission also filed a civil lawsuit on related grounds. The charges were made public following his arrest in New York, where he was released on $2.25 million bond. Spagnuolo is an Italian citizen residing in Switzerland and has been placed on leave by Google.
Polymarket confirmed it flagged the suspicious account and cooperated with federal authorities. The platform emphasized that insider trading is prohibited and that its blockchain-based trading system allows for traceability and enforcement of rules against misconduct.
Why it matters
This case highlights emerging regulatory and enforcement challenges as insider trading expands into decentralized and blockchain-based prediction markets. Polymarket’s growing popularity for trading on event outcomes, including political and social matters, presents new risks for market manipulation based on nonpublic information.
The charges mark the second insider trading prosecution involving Polymarket users within months, demonstrating increased federal scrutiny of digital asset markets. These enforcement actions underscore the need for clear oversight and the potential legal consequences for using confidential or inside information in novel trading platforms.
Background
In recent years, prediction markets like Polymarket have surged in use, allowing traders to bet on the likelihood of real-world events. This new terrain has attracted regulators’ attention due to concerns about fairness and the use of privileged information.
Earlier this year, a U.S. special forces soldier was arrested for allegedly profiting by betting on a covert military operation before it became public. The soldier pleaded not guilty, but the case raised alarms about insider trading linked to sensitive information on such platforms.
Polymarket asserts that its transparent blockchain structure enables the detection of misconduct and supports cooperation with law enforcement efforts to maintain market integrity.
Sources
This article is based on reporting and publicly available information from the following source:
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