34,000 Trades Flagged. A Soldier Charged. Prediction Markets Have an Insider Trading Problem.

Bloomberg Businessweek's August 2026 issue identified 34,000 flagged trades on Polymarket. Kalshi announced an anti-insider-trading partnership on August 4.

In early February, Caden Booth, a 21-year-old TikToker, flew from Cincinnati to San Francisco and waited outside the Super Bowl venue for 12 hours. When rehearsals for the national anthem began, he timed each version with a stopwatch. He then traded more than $50,000 on Polymarket that the anthem would run under 117 seconds on game day. It ran for 104. He won.

Nobody charged him with anything. He had stood on a public sidewalk and listened. But the accusations of insider trading came regardless — and his case became the gentlest version of a problem that has since grown considerably more serious.

What Bloomberg Found

Bloomberg Businessweek's August 2026 issue reviewed a dataset of 34,000 Polymarket trades, flagged by analytics platform Polysights between August 2025 and June 2026, as displaying characteristics associated with potential insider activity. The trades covered Polymarket's global exchange, where positions are publicly visible on a blockchain — unlike on Kalshi, where they are not.

Roughly $200 million of the flagged volume fell in the first half of 2026 alone. The activity with insider-associated characteristics became more prevalent from January onward. Geopolitical and war-related contracts accounted for much of the increase. Iran-related trading produced a particularly large spike in late February.

The 34,000 figure does not represent 34,000 proven violations. Polysights scores trades against a model designed to identify patterns consistent with advance knowledge. A flagged trade is a signal, not a verdict. But the scale and the timing tell a coherent story: as prediction markets have grown larger and more liquid, the incentive to trade on non-public information has grown with them.

Track live prediction market prices across Kalshi and Polymarket at predictions.io/lobby/us-politics.

The Criminal Case

The most significant development arrived in April, when prosecutors charged Gannon Ken Van Dyke, a US Army soldier, with using classified military intelligence to trade on Polymarket. Van Dyke allegedly had advance knowledge of the timing of the capture of Venezuelan President Nicolás Maduro and used it to accumulate a position that paid out more than $400,000.

The case moved the insider trading problem from an abstract concern about market integrity to a criminal prosecution involving national security. Bloomberg reported that concerns about prediction markets reached the White House. The House Oversight Committee, led by Chairman James Comer, sent letters to Polymarket's Shayne Coplan and Kalshi's Tarek Mansour in May requesting documents on how the platforms verify account holder identities, enforce geographic restrictions, and monitor suspicious trading activity.

What Platforms Are Doing

On August 4, Kalshi announced a partnership specifically designed to help companies police insider trading on the platform. Both Kalshi and Polymarket have been tightening surveillance and banning suspicious accounts throughout 2026. Bloomberg reported those efforts have not stopped the activity — traders are finding new ways to avoid detection.

The structural challenge is straightforward. Prediction markets reward the earliest and best-informed traders. Contracts tied to government decisions, corporate announcements, and military events create situations where an employee or official may possess information the public does not. The deeper and more liquid the market, the larger the available reward for someone willing to trade on it.

Why It Matters for Prices

predictions.io aggregates live prices from Kalshi and Polymarket. If a contract's price moves sharply ahead of a public announcement, that movement is worth reading carefully. It may reflect legitimate analysis. It may reflect something else. The Bloomberg dataset does not resolve that question for any individual trade — it shows the scale at which the question now needs to be asked.

Track live prediction market prices across Kalshi and Polymarket at predictions.io/lobby/crypto.

Short Version

Bloomberg's August 2026 Businessweek issue flagged 34,000 Polymarket trades as displaying insider-trading characteristics from August 2025 to June 2026 — roughly $200M in suspicious volume in H1 2026 alone. US soldier Gannon Ken Van Dyke was criminally charged for using classified intelligence to win $400,000+ on Maduro's capture. Kalshi launched an anti-insider-trading partnership on August 4. The House Oversight Committee is investigating both platforms. Prices on both platforms remain visible live at predictions.io/lobby/us-politics.

Track live prediction market prices across Kalshi and Polymarket at predictions.io/lobby/us-politics.

Last updated: August 6, 2026. Sources: Bloomberg Businessweek (August 2026), FinanceFeeds, CNBC, John Lothian News, Bloomberg News (April 2026, May 2026).