Are Prediction Markets Legal in Massachusetts?

Last verified: 2026-07-15

Restricted Scope: Sports contracts only

Restricted right now — a court order limits sports contracts in Massachusetts

Right now, Massachusetts has a court order or enforcement action in place that blocks or limits some contract types on major prediction-market platforms. Appeals are typically still pending, so this status can change.

This is not legal advice. Prediction-market legality is contested and changes quickly. This page reflects publicly reported facts as of the last-verified date above and links to a primary or trade-press source below. Consult a licensed attorney in Massachusetts and check each platform's own current state-availability page before trading.

What This Means for Kalshi vs. Polymarket in Massachusetts

The dispute in Massachusetts is specifically about sports-related contracts (who wins a game, a spread, a player prop) — on both Kalshi and Polymarket. Non-sports contracts (politics, economics, weather, entertainment) from either platform are not the subject of this fight in Massachusetts. Kalshi and Polymarket US are both CFTC-regulated exchanges, and neither has a legal advantage over the other in this dispute — state actions in this category name multiple platforms at once, not one company exclusively.

The Full Picture in Massachusetts

AG Andrea Joy Campbell sued Kalshi in Suffolk Superior Court (Aug. 2025); a judge granted a preliminary injunction (Jan. 20, 2026) letting the state bar Kalshi’s sports contracts. Polymarket separately sued Campbell (Feb. 9, 2026). The Massachusetts Supreme Judicial Court took direct appellate review and, at oral argument, appeared inclined to side with the state — the first state high court to address the issue. No final ruling yet.

Source: Courthouse News — Massachusetts high court Last verified: 2026-07-15

Why Is This Even Contested? The Federal-vs-State Fight

Prediction markets sit at the intersection of two legal regimes that currently disagree. Kalshi and Polymarket US register their contracts with the CFTC as swaps or event contracts on a federally designated exchange, and argue that federal law preempts conflicting state gambling law. State gaming regulators counter that sports-related contracts — betting on who wins a game, a point spread, or a player prop — are functionally sports betting, which most states require a separate license to offer. Federal appellate courts are currently split: the Third Circuit ruled for Kalshi on preemption grounds (April 6, 2026), while a federal judge in the Southern District of New York ruled against Kalshi on the same underlying question (July 8, 2026). This is genuinely unresolved law, not a settled "CFTC means legal everywhere" fact — treat any claim that federal registration alone guarantees legality in every state with skepticism.

Dispute is about sports-related event contracts specifically (who wins a game, point spreads, player props). Non-sports event contracts (politics, economics, weather, entertainment) are not the subject of the dispute in this state.

Massachusetts-Specific Timeline

Entries from our full regulatory timeline that specifically reference Massachusetts.

2025-08

Massachusetts AG sues Kalshi; Maryland court denies Kalshi’s injunction request

AG Andrea Joy Campbell sues Kalshi in Suffolk Superior Court over unlicensed sports wagering. Separately, a federal court in Maryland denies Kalshi injunctive relief, finding Congress didn’t clearly intend to preempt state gambling law.

Source: Regulatory Oversight — Massachusetts sues Kalshi
2026-01-20

Massachusetts wins preliminary injunction to bar Kalshi sports contracts

A federal judge grants Massachusetts a preliminary injunction permitting the state to bar Kalshi’s sports event contracts while the underlying case proceeds.

Source: RotoWire — legal timeline
2026-02-09

Polymarket sues Massachusetts AG Campbell

Polymarket files its own suit challenging Massachusetts’s authority to ban its sports event contracts.

Source: RotoWire — legal timeline
2026-07-10

Ninth Circuit hears California tribal sovereignty appeal

A Ninth Circuit panel presses Kalshi on why its sports event contracts shouldn’t count as Class III gaming under IGRA on tribal lands. Massachusetts, California, 25 other states, and DC file support for the tribes’ position. No ruling yet; the underlying case and Kalshi’s separate Nevada case both remain stayed pending this decision.

Source: Bettors Insider — Ninth Circuit tribal appeal

Frequently Asked Questions

Is Kalshi legal in Massachusetts?
Right now, Massachusetts has a court order or enforcement action in place that blocks or limits some contract types on major prediction-market platforms. Appeals are typically still pending, so this status can change. AG Andrea Joy Campbell sued Kalshi in Suffolk Superior Court (Aug. 2025); a judge granted a preliminary injunction (Jan. 20, 2026) letting the state bar Kalshi’s sports contracts. Polymarket separately sued Campbell (Feb. 9, 2026). The Massachusetts Supreme Judicial Court took direct appellate review and, at oral argument, appeared inclined to side with the state — the first state high court to address the issue. No final ruling yet.
Is Polymarket legal in Massachusetts?
The same status applies to Polymarket as to Kalshi in Massachusetts -- state actions in this category virtually always name multiple platforms rather than one exclusively. The dispute in Massachusetts is specifically about sports-related contracts (who wins a game, a spread, a player prop) — on both Kalshi and Polymarket. Non-sports contracts (politics, economics, weather, entertainment) from either platform are not the subject of this fight in Massachusetts. Kalshi and Polymarket US are both CFTC-regulated exchanges, and neither has a legal advantage over the other in this dispute — state actions in this category name multiple platforms at once, not one company exclusively.
Is there a court order blocking prediction markets in Massachusetts?
AG Andrea Joy Campbell sued Kalshi in Suffolk Superior Court (Aug. 2025); a judge granted a preliminary injunction (Jan. 20, 2026) letting the state bar Kalshi’s sports contracts. Polymarket separately sued Campbell (Feb. 9, 2026). The Massachusetts Supreme Judicial Court took direct appellate review and, at oral argument, appeared inclined to side with the state — the first state high court to address the issue. No final ruling yet.
Where can I check the latest prediction market status for Massachusetts?
This page cites its primary source directly (Courthouse News — Massachusetts high court) and was last verified 2026-07-15. For the full 51-row tracker and the complete regulatory timeline, see the Odds Reference prediction markets legal tracker -- this is a fast-moving area and any single page, including this one, can lag the latest court filing.

Related Reading

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