Kalshi Faces Class Action Lawsuit Over Khamenei Market Resolution

Key Points

Table of Contents

A class action lawsuit has been filed against prediction market platform Kalshi regarding the settlement of a market focused on Iranian Supreme Leader Ali Khamenei’s departure from power.
Contract holders who bet “yes” anticipated receiving complete $1 per share payouts following reports of Khamenei’s death on February 28, but the platform implemented a “death carveout” clause.
Trading activity in the market surpassed $54 million; the two lead plaintiffs maintained positions worth approximately $259.84.
While Kalshi refunded all trading fees and net losses, claiming no trader suffered financial harm, plaintiffs are demanding full contractual payments plus additional punitive compensation.
Co-founder Tarek Mansour defended the company’s position, stating the provision was explicitly outlined and that the platform prohibits markets enabling profit from death.

US-based prediction market operator Kalshi finds itself defending against a class action complaint lodged with the US District Court for the Central District of California. The litigation revolves around the platform’s handling of a controversial market asking “Ali Khamenei out as Supreme Leader?”

We stand by principle and law:

1. Kalshi didn’t deviate from its market rules. They were clear that death did not resolve the market to “Yes”.

2. Kalshi’s rules prevented a ‘death market’, where traders directly profit from death. This is a good thing (+ we’re a US based… https://t.co/gXMeQECFLz

— Tarek Mansour (@mansourtarek_) March 6, 2026

The disputed market posed a straightforward question: would Khamenei depart from his position before March 1, 2026? Participants purchasing “yes” positions anticipated receiving the maximum $1 per contract if events confirmed their prediction.

When numerous news organizations confirmed Khamenei’s passing on February 28, contract holders assumed their positions would settle at face value.

However, Kalshi activated a “death carveout provision” embedded in the market rules. Under this mechanism, when a political figure exits office exclusively through death, settlements occur at the final trading price instead of distributing full winnings to successful predictors.

According to the complaint, this provision remained hidden within complex market specifications. Plaintiffs contend the disclosure failed to meet standards that would reasonably inform typical platform users before they committed capital.

The legal filing asserts the carveout clause “was not incorporated into the user-facing rules summary.” Additionally, it maintains the policy’s presentation fell short of alerting a “reasonable consumer.”

Court documents note that Kalshi subsequently conceded their original disclosure language contained “grammatically ambiguous” elements.

The lead plaintiffs maintained combined positions totaling roughly $259.84. Meanwhile, aggregate trading volume for this particular market crossed $54 million.

How Kalshi Has Responded

Tarek Mansour, co-founder of Kalshi, took to X (formerly Twitter) to publicly address the controversy. He emphasized the platform maintains firm guidelines preventing markets that create financial incentives from mortality.

“We don’t list markets directly tied to death,” Mansour explained, asserting the provision existed within official market documentation and wasn’t concealed from users.

Kalshi issued refunds covering every trading fee and net loss associated with the disputed market. Company representatives maintain that zero traders experienced actual monetary losses.

Mansour conceded that improvements could be made regarding how the platform presents rule disclosures prior to bet placement.

Plaintiff Demands

The refund measures haven’t satisfied the plaintiffs. They’re pursuing compensatory damages matching the complete anticipated payout values.

Additionally, they seek punitive damages designed to prevent comparable practices going forward.

The complaint characterizes the carveout mechanism as “predatory” and constituting an “unfair business practice.” Plaintiffs argue that for a market concerning an octogenarian leader amid escalating military tensions, mortality represented the most probable scenario.

The company recently completed a fundraising round valuing it at $11 billion. This achievement came as prediction markets experience unprecedented trading volumes throughout 2026.

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