Prediction Markets Weekly: Kalshi, the NFL, and Growing Pains

Prediction markets had another busy week, with the industry continuing to grow while facing significant challenges. The NFL is taking its concerns to the Supreme Court, Kalshi is expanding into traditional financial products, and companies are spending millions to influence the rules governing their businesses.

Prediction markets have gained serious momentum in 2026. But as these platforms grow and become more established, they're also discovering that growth brings a new set of problems. This week offered a pretty good look at both sides of that equation.

The NFL Takes its Concerns to the Supreme Court

One of the week's biggest developments came Thursday when the NFL filed an amicus brief supporting New Jersey regulators in their Supreme Court dispute with Kalshi. The league wants the Supreme Court to review whether sports event contracts fall exclusively under federal oversight or whether states can regulate them.

The NFL raised concerns about game integrity, consumer protections, and the differences between federal and state regulatory standards. It specifically highlighted contracts involving player injuries, officiating decisions, and events that could potentially be influenced by individual participants. The league also wants a minimum trading age of 21 for sports contracts, compared with Kalshi's current 18-year minimum.

What's interesting is how much activity football already generates for prediction markets. According to the NFL's filing, football-related contracts accounted for $1.8 billion of the $3.3 billion traded across prediction markets on the opening Sunday of the 2026 season.

That's more than half of the industry's trading volume that day. The NFL understands how popular these products have become, but it also wants to ensure the protections it has developed alongside state regulators remain relevant. Regardless of which side of the regulatory argument you support, I think those concerns deserve a serious conversation.

Kalshi Is Expanding Beyond Prediction Markets

While the NFL challenges the industry's regulatory framework, Kalshi is moving ahead with plans to become much more than a prediction market exchange. The company recently launched US500PERP, a perpetual futures contract tied to an index tracking 500 of the largest publicly traded U.S. companies.

The product lets traders gain leveraged exposure to the broader stock market without the traditional expiration dates of standard futures contracts. I think this is one of Kalshi's more interesting recent developments. Much of the conversation surrounding the company has focused on sports event contracts and its legal battles with state regulators. But CEO Tarek Mansour has made it clear that he envisions Kalshi becoming a broader financial exchange.

Products like US500PERP are another step toward that goal. It also raises an interesting question about the industry's future. Will prediction market companies remain focused primarily on event contracts, or will some evolve into full-service trading platforms? Kalshi certainly seems interested in the latter.

The Regulatory Battle Keeps Getting Bigger

The NFL isn't the only organization asking the Supreme Court to address the legal uncertainty surrounding prediction markets. This week, 39 state attorneys general and a Native American tribe also supported New Jersey's request for Supreme Court review. The disagreement centers on whether the Commodity Futures Trading Commission has exclusive authority over sports event contracts or whether states can apply their own regulations.

Federal appeals courts have already reached conflicting conclusions. The Third Circuit supported Kalshi's position, while the Sixth and Ninth Circuits favored state regulatory authority. That's a difficult situation for companies trying to operate nationally. The industry is also spending heavily to influence the outcome.

Kalshi, Polymarket, and the Coalition for Prediction Markets have collectively spent at least $3 million on lobbying and political contributions during 2026. Kalshi has hired lobbyists across 41 states as regulatory disagreements continue. I don't think it's surprising that companies are investing in protecting their businesses.

What stands out is how much time and money the industry now has to devote to legal and political battles. Platforms need consistent rules to make long-term decisions. Right now, the regulatory environment remains anything but consistent.

More Markets Aren't Necessarily Better Markets

Beyond the legal challenges, another issue deserves more attention. Prediction market platforms keep introducing new contracts, categories, and products, but do those additions actually improve the trader experience? I've argued recently that the industry would benefit from focusing more on market quality rather than constantly expanding the number of available contracts.

Liquidity, competitive pricing, clear settlement rules, and a straightforward user experience matter more than simply offering thousands of different markets. A platform can introduce dozens of new contracts every day, but that doesn't necessarily make it better if most attract limited trading activity.

The industry has already demonstrated that it can generate impressive trading volume. The bigger challenge is turning that activity into a sustainable business with customers who continue returning. That requires more than new product announcements.

Growing Pains Are Part of the Next Chapter

Looking at everything that happened this week, I think prediction markets are entering an important stage of development. The industry has largely moved beyond proving that people are interested in trading on real-world events. The trading volume, new products, and growing commercial interest have already answered that question.

Now the expectations are changing. Professional sports leagues want stronger protections. States want clarity about their regulatory authority. Companies want room to expand, and traders want reliable platforms with markets worth trading. Those interests aren't necessarily incompatible, but balancing them won't be easy.

I expect we'll continue to see new products, regulatory challenges, and major industry announcements in the coming months. The real question is which companies can successfully navigate those challenges while improving the experience they offer. Prediction markets have proven they can grow quickly. Now they need to show they can grow sustainably.