The legal battle over sports prediction markets in the United States is moving closer to a potential Supreme Court review. The National Football League (NFL) has filed a brief supporting New Jersey’s request for the Supreme Court to examine whether states can enforce their sports gambling laws against prediction market platforms such as Kalshi.
The dispute centers on the relationship between federal derivatives regulation and state gambling laws. Kalshi argues that its sports event contracts fall under the exclusive regulatory authority of the Commodity Futures Trading Commission (CFTC). New Jersey, however, maintains that states should retain the power to regulate sports-related wagering offered to their residents.
The NFL’s October 8 filing adds a significant voice to the debate, highlighting concerns about consumer protection, sports integrity and the rapid growth of prediction markets.
NFL Raises Concerns Over Sports Integrity
In its brief, the NFL argues that state-level oversight plays an important role in protecting consumers and maintaining the integrity of professional sports. The league believes sports prediction markets raise regulatory questions that cannot necessarily be resolved through federal derivatives oversight alone.
The NFL also highlighted the scale of trading activity connected to professional football. According to the league’s filing, approximately $1.8 billion of the $3.3 billion traded on prediction markets during the first Sunday of the NFL season involved its games.
These figures demonstrate the growing financial significance of sports-related event contracts. They also explain why the league is paying close attention to how these products are offered, monitored and regulated.
However, the NFL’s filing represents the position of an interested party. It does not establish that all sports prediction markets violate existing laws or that the Supreme Court will ultimately side with New Jersey.
New Jersey Seeks Supreme Court Review of Kalshi Ruling
New Jersey filed a petition for a writ of certiorari in Flaherty v. KalshiEX after the U.S. Court of Appeals for the Third Circuit ruled in Kalshi’s favor in April.
A petition for a writ of certiorari asks the Supreme Court to review a lower court decision. Filing such a petition does not mean the justices have agreed to hear the case.
The central legal question is whether the federal Commodity Exchange Act prevents states from applying their sports gaming laws to event contracts offered through a CFTC-regulated market.
New Jersey argues that federal derivatives legislation did not eliminate traditional state authority over sports gambling. The state maintains that Congress did not intend to remove established gaming protections simply by allowing certain financial contracts to trade on federally regulated exchanges.
Kalshi takes a different position. The company argues that designated contract markets operate under a federal regulatory framework and that states cannot independently impose conflicting gambling restrictions on contracts covered by that framework.
The disagreement could have important consequences for prediction market operators, state regulators and consumers across the United States.
Appeals Courts Reach Different Conclusions
The dispute has become more significant because federal appeals courts have taken different approaches to the regulation of sports event contracts.
The Third Circuit’s decision favored Kalshi in its dispute with New Jersey. Meanwhile, decisions from the Sixth and Ninth Circuits have allowed state regulatory claims involving similar sports event offerings to proceed in other cases.
These decisions do not necessarily involve identical facts, legal claims or state laws. Nevertheless, the differing approaches have intensified the debate over how federal and state regulatory powers should interact.
At the heart of the disagreement is the legal concept of federal preemption. This principle generally means that federal law can displace state law when the two conflict and federal law takes priority.
Kalshi argues that federal oversight of designated contract markets limits the ability of states to regulate its event contracts as sports gambling. State authorities, by contrast, argue that federal derivatives regulation should not automatically prevent them from enforcing laws designed to protect residents from unlawful wagering.
The Supreme Court could eventually clarify the boundaries between these competing regulatory systems if it agrees to review the dispute.
Why the Case Matters for Prediction Markets
Prediction markets allow users to trade contracts linked to the outcomes of future events. In sports markets, a contract may pay out based on whether a particular team wins a game or another specified result occurs.
Platforms such as Kalshi classify eligible products as event contracts traded through a federally regulated exchange. Traditional sportsbooks generally operate under state-specific licensing and gambling regulations.
Although the products may produce similar financial outcomes for customers, their legal treatment can differ depending on their structure and the applicable laws.
A Supreme Court decision could influence where sports event contracts can be offered, which regulatory requirements platforms must follow and how much authority states retain over these products.
A ruling favoring New Jersey could strengthen the position of states seeking to apply gambling restrictions to certain sports prediction contracts. A decision favoring Kalshi could reinforce the role of federal regulation in determining how those contracts are governed.
The ultimate impact would depend on the Court’s reasoning, the scope of its decision and the specific laws involved. Other prediction markets and event categories might not automatically receive the same treatment.
Kalshi’s Response Due November 9
According to the Supreme Court docket, Kalshi’s response to New Jersey’s petition is due November 9, 2026. As of October 10, the justices have not agreed to hear the case and have not issued a decision on the underlying legal dispute.
After reviewing the petition and response, the Supreme Court can decide whether to accept the case. If the justices decline review, the existing appellate ruling in the New Jersey dispute will remain in place, although that would not constitute a nationwide ruling on every prediction market.
If the Court accepts the case, further legal briefing and potentially oral arguments would follow before a decision on the merits.
For now, the dispute remains unresolved. The NFL’s intervention highlights the importance of the issue for professional sports, while the differences among federal appeals courts have increased pressure for greater legal clarity.
As prediction markets continue expanding, the outcome of this case could help define the relationship between federally regulated event contracts and state sports gambling laws in the United States.
Disclaimer: This article is for informational purposes only and does not constitute legal, financial or investment advice.
