NFL demands prediction markets halt injury and manipulation bets

NFL sends second letter demanding prediction markets drop injury and manipulation contracts

Sabrina Perel sent the letter on a Thursday, one week before the 2026 NFL regular season opens. As Kalshi's Chief Compliance Officer, she had signed a similar letter in the spring. The categories she flagged then — contracts tied to player injury status, officiating decisions, fan safety, player misconduct — were still live on prediction market exchanges when she wrote again. The second letter exists because the first one did nothing.

The specific contracts the NFL wants gone are worth naming, because the league's logic follows from the particulars. A contract on whether a kicker misses a field goal. Whether a quarterback's first pass attempt is incomplete. Whether a running back gains fewer than a specified number of yards on his opening carry. The NFL's argument is that these outcomes can be moved by one person making one decision in real time, which makes them categorically different from a contract on who wins a game. A player, a coach, an official — any of them can determine how a single-outcome contract resolves, and the NFL's concern is that the existence of the market creates an incentive structure that didn't exist before.

That's the integrity argument, and it's real. But the letter arrives at a moment that makes it harder to read as purely principled. Kalshi recently became the official prediction market partner for nine Major League Baseball teams. The NFL is watching a competitor league collect revenue from the category it's trying to shut down. Perel's letter doesn't address that tension, but it's the context in which any prediction market operator will read it.

The reporting doesn't say whether Kalshi or Polymarket have responded formally to this second letter, or whether either platform has removed any contracts since the spring communication. What it does say is that the categories identified months ago continue to be listed. That's Perel's framing, and she chose it deliberately — the implication being that continued listing after formal notice is a different kind of problem than listing without awareness.

The consensus reading of this situation treats the NFL's pressure as regulatory noise running alongside the main legal track — the circuit split, the Supreme Court petition, the state enforcement actions. I don't think that's where this lands. The legal cases establish whether prediction markets are gambling operations under state law. The NFL's letter is about something else: whether the specific contract structure of prediction markets creates manipulation exposure that traditional sportsbooks, with their fixed pre-game lines, don't have. A prop bet on a quarterback's completion percentage closes before kickoff. A prediction market contract on whether his first pass is incomplete can trade through the snap. That's a different risk surface, and the league is the first actor with standing to name it clearly and publicly.