Polymarket Tightens Rules Across the Board, Insider Trading Concerns Force Regulatory Upgrade

Predictive trading platform Polymarket announced an update to its market integrity rules on Monday, applying simultaneously to U.S. exchanges regulated by the Commodity Futures Trading Commission (CFTC). The update includes stricter market design standards, clearer settlement criteria, more explicit data sources, and enhanced monitoring mechanisms for suspicious trading activities. Recently created accounts on the platform profited approximately $1 million by accurately betting on the US-Iran war, raising concerns about insider trading.

Four Core Measures in Polymarket’s Rule Update

Polymarket’s recent rule update directly responds to criticisms from regulators and market participants regarding the platform’s fairness, with targeted adjustments covering market design and ethical compliance:

Strict Market Design Standards: Raising the approval threshold for creating new markets to ensure issues are clear and verifiable, reducing potential manipulation at the design stage.

Clear Settlement Standards and Data Sources: Standardizing the basis for determining market outcomes and information sources to minimize disputes caused by discretionary settlements.

Enhanced Suspicious Trading Monitoring: Upgrading detection systems to identify abnormal betting patterns and transactions potentially linked to non-public information.

Restrictions on High-Risk Market Types: Banning or limiting markets deemed easily manipulable, ethically sensitive, or conflicted in interests.

Last week, Polymarket took concrete action by banning and reporting a user who issued death threats to an Israeli journalist. The user had previously attempted to intimidate the journalist into altering reports to influence a $17 million prediction market outcome.

Million-Dollar Iran Bet: The Core of Insider Trading Allegations

According to Bloomberg, six accounts created in February 2026 on Polymarket exclusively placed bets on whether the U.S. would strike Iran. These accounts accurately predicted the attack, collectively earning about $1 million. The accounts shared notable characteristics: they were created around the same time, placed bets in the same direction, and achieved an unusually high accuracy rate, fueling widespread suspicion of potential insider trading.

Polymarket has not yet publicly responded to this incident nor confirmed whether a formal investigation into these accounts has been initiated. However, the event has directly influenced the timing of the current rule update and remains a central case of ongoing regulatory and media pressure.

Regulatory Landscape: CFTC Cooperation and State-Level Pressure

This rule update is part of Polymarket’s proactive efforts to align with regulatory legalization pathways. This week, Major League Baseball (MLB) signed a cooperation agreement with Polymarket, while the CFTC separately reached a standalone agreement to strengthen “integrity protections.” Both initiatives are advancing in tandem, demonstrating a coordinated effort to promote the institutionalization of prediction markets through compliance.

However, regulatory pressure persists. Several U.S. states have taken legal actions against prediction platforms, accusing them of operating as unlicensed gambling. Polymarket raised $200 million in July 2025 and reportedly seeks a valuation of $10 billion. Its rapid growth has made it increasingly scrutinized under regulatory review.

Frequently Asked Questions

Q: What exactly are the insider trading allegations against Polymarket?
A: Reports indicate that six accounts created in February 2026 exclusively bet on whether the U.S. would strike Iran, and they accurately predicted the attack, earning about $1 million. The concentration of account creation times, uniform betting directions, and high accuracy have raised suspicions of potential use of non-public information. No official investigation conclusions have been announced yet.

Q: What is the purpose of Polymarket’s recent rule update?
A: The update aims to achieve two goals: first, to strengthen market integrity by implementing stricter design standards, settlement rules, and trading surveillance to reduce manipulation and insider trading risks; second, to demonstrate compliance to regulators and facilitate the legalization of prediction markets in the U.S.

Q: What is Polymarket’s legal status in the U.S.?
A: Polymarket’s U.S. operations are under CFTC regulation, but multiple states have taken legal action against similar prediction platforms for operating as unlicensed gambling. Through cooperation agreements with the CFTC and MLB, Polymarket actively promotes its federal compliance status, though legal uncertainties at the state level remain.