Polymarket Lawsuits: Litigation Tracker

Summary

Polymarket is a party to 12 cases of the 74 on this tracker, involving 11 states.

Restricted (2)

• QCX, LLC (d/b/a Polymarket US) v. Nessel

  No. 1:26-cv-00710 · No. 26-1552

  Injunction denied; on appeal (6th Cir.)6th Cir.; W.D. Mich. (Judge Maloney) belowMI

  Judge Maloney denied Polymarket US a preliminary injunction (June 2026), holding sports event contracts are not swaps under the Commodity Exchange Act.Checked Sep 22, 2026

• State of Nevada ex rel. Nevada Gaming Control Board v. Blockratize Inc. (Polymarket)

  No. 26OC000121B · No. 3:26-cv-00089 · No. 26-1343

  State-court injunction in force; remand appeal on hold (9th Cir.)Nev. 1st Jud. Dist. (Carson City); 9th Cir. remand appealNV

  Remanded to state court (March 2026) over Polymarket’s objection; the state court has since entered a preliminary injunction, and the Ninth Circuit refused to stay the remand.Checked Sep 25, 2026

Blocked for Market (1)

• KalshiEX LLC v. Ellison; QCX LLC (Polymarket US) v. Ellison

  No. 0:26-cv-02778 · No. 0:26-cv-02841

  Statute enjoined; not in effectU.S. District Court for the District of Minnesota (Nos. 0:26-cv-02778 and 0:26-cv-02841, consolidated with 0:26-cv-02661; Judge Katherine M. Menendez)MN

  One July 27, 2026 opinion preliminarily enjoined the first statutory ban in all three consolidated cases, on express preemption, and only as to CFTC-registered designated contract markets.Checked Sep 22, 2026

Pending (9)

• Connecticut cease-and-desist orders to nine platforms (September 2026)

  Orders issued; first platform suit filedConnecticut Department of Consumer Protection — administrativeCT

  Connecticut ordered nine more platforms to stop offering sports event contracts (September 10, 2026) and issued about thirty subpoenas to vendors, app stores and media organizations.Checked Sep 22, 2026

• Missouri Attorney General cease-and-desist letters (September 2026)

  Pre-suit letters; response window runningMissouri Attorney General — pre-suit letters (no court proceeding)MO

  Missouri’s Attorney General told six platforms to stop offering sports event contracts or get licensed and taxed as sportsbooks (letters dated September 16, 2026).Checked Sep 22, 2026

• People of the State of New York v. QCX LLC (d/b/a Polymarket US)

  No. 1:26-cv-08338

  Petition filed; removed to federal courtS.D.N.Y. (removed from NY County Supreme Court)NY

  The New York Attorney General filed an Executive Law § 63(12) petition against QCX LLC (Polymarket US) seeking an injunction, restitution, disgorgement and statutory penalties.Checked Sep 25, 2026

• QCX LLC (d/b/a Polymarket US) v. James

  No. 1:26-cv-08345

  Filed; no rulingS.D.N.Y.NY

  Polymarket US sued New York’s Attorney General and Gaming Commission (September 24, 2026) for a declaration that federal law preempts state enforcement against its event contracts.Checked Sep 25, 2026

• Mayor and City Council of Baltimore v. QCX LLC (Polymarket)

  No. C-24-CV-26-005535 · No. 1:26-cv-03253

  Filed — municipal consumer-protection actionD. Md. (Judge Bennett); removed from Baltimore CityMD

  Baltimore filed a separate consumer-protection action against Polymarket’s exchange entities — QCX LLC, Blockratize Inc. and QC Tech LLC — alongside its Kalshi suit; QCX removed it to federal court.Checked Sep 22, 2026

• QCX LLC (d/b/a Polymarket US) v. Torrez

  No. 1:26-cv-02100

  StayedD.N.M. (Judge Urias)NM

  Stayed by agreement (August 2026) before any merits ruling.Checked Sep 22, 2026

• Kentucky enforcement actions v. Kalshi & others (Franklin Circuit Court)

  No. 26-CI-00689 · No. 26-CI-00696 · No. 3:26-cv-00048

  PendingFranklin Circuit Court (No. 26-CI-00689); removed to E.D. Ky.KY

  Kentucky’s AG sued Kalshi, Polymarket, and distribution partners (June 2026), plus an excise tax; the CFTC then sued the state.Checked Sep 22, 2026

• State of Rhode Island v. KalshiEX LLC

  No. PC-2026-02753 · No. 1:26-cv-00333

  PendingRhode Island state courtRI

  Rhode Island’s AG sued Kalshi and Polymarket US (May 2026); the case is consolidated with Kalshi’s own suit, in which the United States and the CFTC intervened.Checked Sep 22, 2026

• QCX LLC (d/b/a Polymarket US) v. Campbell

  No. 1:26-cv-10651

  Stayed pending the Kalshi appeal; enforcement standstillD. Mass. (Judge Young)MA

  Stayed by stipulation (March 2026) until Kalshi exhausts its state appeal, with the Attorney General agreeing not to enforce against Polymarket US in the meantime.Checked Sep 25, 2026

What Changed

Logged September 25, 2026

• New caseSeptember 24, 2026

  QCX LLC (d/b/a Polymarket US) v. James

  Polymarket US sued New York’s Attorney General and the eight Gaming Commission officials in federal court for a declaration that the Commodity Exchange Act preempts state enforcement against its event contracts, the same day the Attorney General petitioned against it.

  Complaint, QCX LLC v. James, 1:26-cv-08345 (S.D.N.Y.), ECF 1

• FilingSeptember 24, 2026

  People of the State of New York v. QCX LLC (d/b/a Polymarket US)

  Polymarket US removed the Attorney General’s petition to the Southern District of New York (No. 1:26-cv-08338), invoking the federal-officer removal statute and federal-question jurisdiction.

  Notice of removal, 1:26-cv-08338 (S.D.N.Y.), ECF 1

• New caseFebruary 9, 2026

  QCX LLC (d/b/a Polymarket US) v. Campbell

  Added to the tracker: Polymarket US’s Massachusetts preemption suit, stayed by stipulation in March 2026 until Kalshi exhausts its state appeal, with the Attorney General agreeing not to enforce in the meantime.

  Stipulation and joint motion to stay, 1:26-cv-10651 (D. Mass.), ECF 21

• New caseJanuary 16, 2026

  State of Nevada ex rel. Nevada Gaming Control Board v. Blockratize Inc. (Polymarket)

  Added to the tracker: the Nevada Gaming Control Board’s enforcement action against Polymarket, remanded to state court in March 2026, where a preliminary injunction has since been entered; Polymarket’s remand appeal is on hold at the Ninth Circuit.

  Order granting remand, 3:26-cv-00089 (D. Nev.), ECF 41

Logged September 24, 2026

• New caseSeptember 24, 2026

  People of the State of New York v. QCX LLC (d/b/a Polymarket US)

  New York’s Attorney General filed an Executive Law § 63(12) petition against QCX LLC, which does business as Polymarket US, in New York County Supreme Court. It seeks an injunction against unlicensed event contracts, restitution, disgorgement, treble gains and $100,000 per unauthorized sports-wagering offer.

  NY Attorney General — Verified Petition

Logged September 22, 2026

• FilingSeptember 16, 2026

  QCX, LLC (d/b/a Polymarket US) v. Nessel

  Michigan filed its Sixth Circuit brief defending the denial of Polymarket US’s injunction. Polymarket US’s reply is next.

  CourtListener — No. 26-1552 (6th Cir.)