Kalshi Pulls Athlete Injury Markets After CFTC Pressure on Player Availability Contracts

Meta description: Kalshi removed athlete injury markets after CFTC pressure, following Polymarket’s withdrawal of NFL player availability filings.

Tags: Kalshi, Polymarket, CFTC, Sports Contracts, NFL, Federal Register

Market platform: Kalshi

Category: Regulation

Kalshi removed athlete injury and player participation markets from its platform in early September after pressure from the Commodity Futures Trading Commission, according to Sportico reporting cited by multiple industry outlets. The move followed Polymarket’s withdrawal of similar NFL player availability filings in late August, putting both exchanges on the same side of the CFTC’s proposed limits on injury-linked sports contracts.

The regulatory issue is narrow but important: whether federally regulated prediction markets can list contracts whose payout depends on whether a specific athlete is injured, returns from injury, or participates in a particular game. The CFTC has not issued a final rule banning the category, but its June 12, 2026 Federal Register proposal identifies player injury contracts as likely contrary to the public interest.

What did Kalshi remove from its platform?

Kalshi had listed contracts tied to athlete participation and return timelines, including the template “Will athlete participate in event in/before time period?” The CFTC’s designated contract market product database shows Kalshi self-certified that contract type on February 19, 2026.

Sportico reported that Kalshi removed athlete injury and return-timeline markets after a CFTC request. Complete iGaming, citing Sportico, said Kalshi had offered markets in 2026 based on when athletes including Luka Doncic, Anthony Edwards and Malik Nabers would next play. SCCG Management, also citing Sportico, described the removed products as markets tied to injury durations and player availability.

Separately, Legal Sports Report reported on August 28 that Kalshi was proceeding with similar player participation contracts after Polymarket withdrew its own filings. Gambling.com reported on September 1 that Kalshi continued to offer similar contracts after Polymarket pulled a filing for the question, “Will Patrick Mahomes participate in the Kansas City Chiefs’ Week 1 regular-season game?”

The removed Kalshi markets sat inside a broader sports portfolio that remains under legal and regulatory pressure. Next Event Horizon reported that on Saturday, August 29, 2026, sports represented 28% of Kalshi’s volume and parlays represented 57.8% of Kalshi volume. Those figures describe one trading day, not a midyear average.

What has the CFTC said about athlete injury contracts?

The CFTC’s position is set out in its proposed rule, “Prediction Markets; Public Interest Determinations,” published in the Federal Register on June 12, 2026 as 91 FR 35806. The notice proposed amendments to Regulation 40.11 and a new Appendix F for event contracts involving enumerated activities under the Commodity Exchange Act.

In that proposal, the CFTC said it “preliminarily believes” that event contracts settling solely by reference to the duration, severity, occurrence, or medical diagnosis of an injury sustained by a specific athlete raise serious public interest concerns. The agency gave three reasons: incentives around physical harm, confidentiality risks involving medical information, and questions about whether physician diagnoses or injury reports provide objective and manipulation-resistant settlement criteria.

The proposal’s language matters because it stops short of a final prohibition. The Federal Register notice said comments had to be received by July 27, 2026. As of early September, the next formal step is CFTC action on a final rule or another agency proceeding, not public comments on the June proposal.

That distinction is central to the industry fight. Self-certification lets a designated contract market list a contract after certifying that it complies with the Commodity Exchange Act and CFTC rules. The CFTC can then review and challenge contracts through the procedures in Part 40. The athlete injury episode shows the agency using pressure and proposed-rule guidance before a final sports-market rule is in place.

How did Polymarket’s withdrawal affect the dispute?

Polymarket moved first. Legal Sports Report reported that Polymarket submitted player participation filings to the CFTC on August 25, 2026, then withdrew them one day later. Finance Magnates reported that the withdrawals covered both a broader NFL participation product class and a Patrick Mahomes-specific contract.

ESPN reported that a Polymarket source said the company withdrew the filing “to be in full compliance with the CFTC.” Gambling.com also cited the ESPN account and reported that Polymarket continued to engage with the regulator on its offerings.

The Mahomes market became the clearest test case because it was framed around Week 1 participation rather than an explicit medical diagnosis. The CFTC’s June proposal, however, treats injury-linked participation markets as a risk category when settlement turns on a player’s health, return timeline, or availability.

After Polymarket’s withdrawal, Kalshi’s continued listings created a short-lived split between two CFTC-regulated prediction market operators. Kalshi’s removal ended that split without a published CFTC final rule or court order specific to the injury-market category.

Why do regulators treat player availability differently from game outcomes?

The CFTC’s June proposal distinguishes broad sports outcomes from more sensitive sports contracts. It said aggregate sports outcomes, including final scores, point differentials, win-loss results, advancement, statistics and season-long metrics, may be less problematic when settlement uses objective, verifiable data and robust integrity coordination.

Player injury contracts are different because the relevant information can be private, medically sensitive and unevenly distributed. A player, family member, trainer, team employee, agent, league official or media-rights partner may know more about a player’s availability than the public market does. That creates a classic information asymmetry problem, with the added public-interest concern that the contract is linked to an athlete’s health.

Kalshi’s own rules attempted to address that risk through trading restrictions. The company’s June 2026 CFTC rule filing for team-position contracts added prohibitions for team-affiliated persons, candidate-affiliated persons and others with access to material nonpublic information. For player participation markets, similar guardrails would address some insider-trading concerns, but they would not eliminate the CFTC’s broader objections to incentives and medical confidentiality.

Sports leagues have raised related concerns. ESPN reported in March 2026 that the NFL asked prediction market operators, including Kalshi and Polymarket, to refrain from offering contracts on events that could be easily manipulated or known in advance. ESPN said the NFL’s objections included player injuries, officiating, draft picks, coach firings, player signings, celebrity attendance and other categories the league viewed as vulnerable.

Is this part of a broader legal problem for Kalshi sports markets?

Yes. The injury-market removal came during a wider state and federal fight over whether Kalshi’s sports contracts are federally regulated derivatives or state-regulated gambling products.

In Nevada, the U.S. Court of Appeals for the Ninth Circuit refused on August 29, 2026 to let Kalshi restart sports and election event trading while litigation continues, according to the Associated Press. AP reported that the panel said Kalshi had not made a persuasive showing that federal commodities law preempts Nevada gambling law for sports event contracts. The panel sent the election-contract issue back to the district court for further review.

In Maryland, U.S. District Judge Adam B. Abelson denied Kalshi’s motion for a temporary restraining order and preliminary injunction on August 1, 2025 in KalshiEX LLC v. Martin, Case No. 25-cv-1283-ABA. The District of Maryland memorandum opinion said Kalshi had not shown a likelihood of success on the merits of its preemption arguments against Maryland regulators seeking to enforce sports wagering laws.

In Washington, King County Superior Court Judge John McHale ordered Kalshi to geofence Washington users out of sports, elections, politics, entertainment, culture, technology and science, and “mentions” markets, according to GeekWire and Bloomberg Law. GeekWire reported that the order allowed Kalshi to continue offering commodities, climate, economics and finance markets in the state, and required a multi-source geofencing solution by September 2, 2026.

Kalshi also has legal wins. Federal courts previously sided with the exchange in early litigation against cease-and-desist efforts in Nevada and New Jersey, and AP reported that the Third Circuit ruled earlier in 2026 that New Jersey could not regulate Kalshi. Kalshi remains a CFTC-designated contract market, a status it received in 2020.

What is the next milestone for athlete injury markets?

The next regulatory milestone is the CFTC’s handling of the June 12 proposed rule after the July 27 comment deadline. A final rule could give exchanges, leagues and state regulators a clearer legal target for compliance or litigation. Until then, the player injury category is being shaped by CFTC pressure, exchange withdrawals and the broader court fight over sports event contracts.

Kalshi is still investing in sports-adjacent distribution. On August 31, 2026, the USTA announced that Kalshi became the Official Prediction Market Partner of the US Open under an exclusive, multi-year agreement beginning with the 2026 tournament. The USTA announcement said the agreement restricts markets that present integrity risks, including umpire decisions, player injuries and code violations.

That makes the current boundary clearer than it was before the NFL season. Kalshi can pursue sports partnerships and broad sports markets while the legal fight continues. Athlete injury and player availability contracts now sit in a category the CFTC has identified in the Federal Register as likely contrary to the public interest, with Polymarket and Kalshi both stepping back before a final rule is published.