Kalshi and Polymarket have flagged 100+ potential insider-trading cases in 2026, CFTC slow to act

Kalshi and Polymarket have identified more than 100 potential insider-trading cases in 2026, but regulatory follow-through has been slow, according to GambleRss. The outlet reports 50 instances flagged by Kalshi and 90 by Polymarket, spanning activity in the United States and overseas. Those flags indicate suspected misconduct, not established violations.

Enforcement capacity under pressure

GambleRss links the Commodity Futures Trading Commission’s slow response largely to reductions under the Trump administration. Its Chicago bureau has lost all of its trial attorneys, while the agency has absorbed millions in cost cuts. The outlet says many employees departed voluntarily, recognizing opportunities to earn more for their expertise elsewhere.

The enforcement figures suggest a sharp contrast, though the source does not provide a usable comparison period. In 2024, the CFTC secured a record $17.1 billion in monetary relief across 58 enforcement actions. GambleRss contrasts that with 11 actions and less than $1 billion collected more recently, but its description of that period is garbled. Separately, the outlet cites some 22,000 purported stock transactions by President Donald Trump in his first year in office; that figure alone establishes neither misconduct nor a connection to the platforms’ alerts.

The enforcement concerns come as Kalshi and Polymarket face criticism over their treatment of sports-gambling rules and growing pressure in multiple states. According to GambleRss, the CFTC has focused on disputes with governors and attorneys general, intervening in litigation where state authorities regard prediction markets as illegal gambling. The outlet also reports that the regulator has resisted the National Football League’s appeal to consider restrictions on events with outcomes that can be known beforehand or manipulated.

Cases highlight access to outcomes

GambleRss reports that Kalshi allegedly flagged Minnesota state Senator Matthew Klein for trading on his own race. It also describes an April prosecution of a US Army Master Sergeant over wagers on the capture of Venezuela’s Nicolás Maduro, from which he made around $33,000.

The outlet identifies two further cases involving political events. A former White House teleprompter operator who bet on President Trump’s speeches faces a civil settlement with the CFTC. Former Congressman George Santos was fined $35,000 after wagering $17,000 on Kalshi on whether he would attend the State of the Union, according to GambleRss.

Together, the reported alerts and individual cases expose a distinction important to market participants: identifying questionable trading and obtaining an enforcement outcome are separate steps. The material does not establish how many of the 2026 flags have resulted in investigations, charges or penalties.

What it means for prediction markets

• Alerts are not findings: The Kalshi and Polymarket figures measure suspected activity, not proven insider trading.
• Regulatory capacity matters: Reported staffing losses and cost cuts raise questions about how quickly suspicious activity can receive follow-up.
• Contract design is under scrutiny: The NFL’s request puts attention on events where participants may know or influence the result.
• Legal status and trading integrity are distinct: State gambling disputes do not resolve whether individual trades involve improper access to information.