Kalshi Voids Khamenei Market: Traders Report $100K+ Losses

Prediction platform Kalshi voided a market related to Iran's supreme leader Ali Khamenei, citing ethical concerns around profiting from death. CEO Tarek Mansour pledged full reimbursement, but traders are reporting substantial losses and threatening legal action over what they call incomplete compensation.

Kalshi's Ethical Stance and Rollback Mechanism

The market in question centered on political "resignations" and had been available since November 2025. After reports emerged of Khamenei's death, Kalshi froze trading and initiated a rollback process. Mansour addressed the situation publicly on X, outlining the platform's position.

"We don't list markets directly tied to death. When there are markets where potential outcomes involve death, we design the rules to prevent people from profiting from death. That is what we did here" — Tarek Mansour (@mansourtarek_), original post

Mansour argued that the market tied to the Iranian leader's departure from power was "important" from an economic and political standpoint, noting that a leader stepping down does not necessarily involve violence. He cited the situation with Venezuelan President Nicolás Maduro as an alternative example. The CEO acknowledged the incident as a "good lesson" and committed to improving how rules are displayed on the platform.

Under the compensation terms, Kalshi committed to refunding all fees and rolling back positions opened before the news of Khamenei's death to their last trading price. Mansour stated that "no user will lose a single dollar on this market."

Why This Matters

The Kalshi controversy exposes a fundamental tension in prediction markets: the lack of transparent, pre-established cancellation rules can result in significant financial harm to participants. This case raises pressing questions about regulatory standards for platforms dealing with political and geopolitical events. Earlier in February, Ethereum co-founder Vitalik Buterin had warned about the growing reliance on uninformed speculators threatening the viability of the prediction market sector — a concern this incident underscores.

Widespread Complaints and Lawsuit Threats

Despite Mansour's assurances, numerous traders reported losses and inadequate reimbursement. A community note appeared under Mansour's X post directly contradicting his claims, stating: "This is false. Many users have reported losing money on winning trades."

A user named Sameer shared a screenshot showing a winning position placed at 6% probability with $1,034 invested, closed with a compensation of just $245. Had the outcome been honored, the payout would have exceeded $12,000.

"Deceiving your customers, then calling them 'users', and next lying on twitter is going to be fun in court" — Sameer (@sameeriously), original post

"Liar. You're getting sued." — Zander Pyle (@Alexander_333_), original post

Multiple other traders described similar situations with varying loss amounts. One participant filed complaints with the SEC and CFTC requesting an investigation, arguing that cancellation conditions were not disclosed when the market launched. Kalshi has not issued further comments on the compensation issues.

A user going by jellyman highlighted what they see as a double standard: Kalshi previously maintained a market about former President Jimmy Carter's attendance at Donald Trump's inauguration — even after Carter's passing. "You're okay with death, but not when it doesn't make you money," the user wrote.

Record Volumes on Polymarket Amid Geopolitical Turmoil

While the Kalshi dispute unfolded, rival platform Polymarket recorded all-time high trading activity. According to defioasis, on February 28 — the day of the strike on Iran — Polymarket's daily volume reached $478 million.

"Polymarket daily trading volume hit an all-time high with nominal volume reaching $478 million. The political sector reached $220 million, also an all-time high, accounting for 46.2% of the day's volume" — defioasis.eth (@defioasis), original post

Peak values were also recorded within the Polymarket Builders ecosystem. Simultaneously, blockchain analytics firm Bubblemaps identified six suspected insider wallets that placed bets on the Iran strike, collectively earning over $1.2 million.

"Six suspected insiders made $1.2M betting on a US strike on Iran. Most of these wallets were funded in the last 24 hours, specifically bet for February 28, and bought 'yes' hours before the strike" — Bubblemaps (@bubblemaps), original post

What happened with the Kalshi market on Khamenei?

Kalshi voided a market tied to the Iranian leader's "resignation" after reports of his death. Positions were rolled back to the last trading price rather than settled based on the outcome, causing significant losses for traders who held winning positions.

How much compensation did Kalshi users receive?

Kalshi pledged to refund fees and roll back positions to the last traded price. However, traders report major shortfalls — one user invested $1,034 and received only $245, versus a potential $12,000+ payout had the market settled normally.

What were Polymarket's trading volumes during this period?

On February 28, Polymarket hit a record daily volume of $478 million, with $220 million (46.2%) coming from the political sector — also an all-time high.