Polymarket Lawsuits: Litigation Tracker
Last updated November 8, 2026. Snapshot, not legal advice.
Cases
16
Pending
13
Pro-market
0
Anti-market
2
Enjoined
1
Summary
Polymarket is a party to 16 cases of the 90 on this tracker, involving 13 states.
Restricted (2)
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QCX, LLC (d/b/a Polymarket US) v. Nessel
No. 1:26-cv-00710 · No. 26-1552
Judge Maloney denied Polymarket US a preliminary injunction (June 2026), holding sports event contracts are not swaps under the Commodity Exchange Act.Checked Nov 8, 2026
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State of Nevada ex rel. Nevada Gaming Control Board v. Blockratize Inc. (Polymarket)
No. 26OC000121B · No. 3:26-cv-00089 · No. 26-1343
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 Nov 8, 2026
Blocked for Market (1)
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KalshiEX LLC v. Ellison; QCX LLC (Polymarket US) v. Ellison
No. 0:26-cv-02778 · No. 0:26-cv-02841
Also named: Kalshi
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 Oct 28, 2026
Pending (13)
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Missouri Attorney General cease-and-desist letters (September 2026)
Also named: Kalshi, Robinhood, Crypto.com, Novig, Underdog
Novig and Crypto.com’s exchange sued Missouri’s Attorney General and Gaming Commission officials as the thirty-day windows closed (October 16, 2026), and Kalshi followed on October 27 after its extended deadline drew no assurance of non-enforcement.Checked Nov 8, 2026
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Ohio Casino Control Commission cease-and-desist letters (October 2026)
Also named: Robinhood, Coinbase, Novig, Gemini, Webull, Underdog, ProphetX
Ohio’s Casino Control Commission ordered ten platforms and brokers to stop offering sports event contracts in Ohio and confirm compliance within fourteen days, citing the Sixth Circuit’s decision (October 2, 2026).Checked Nov 8, 2026
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People of the State of New York v. QCX LLC (d/b/a Polymarket US)
No. 1:26-cv-08338
The New York Attorney General filed an Executive Law § 63(12) petition against Polymarket US and sought a restraining order; Polymarket US removed it before service, invoking the federal-officer removal statute.Checked Nov 8, 2026
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QCX LLC (d/b/a Polymarket US) v. James
No. 1:26-cv-08345
Polymarket US moved for a preliminary injunction against New York’s Attorney General and Gaming Commission (October 12, 2026), arguing the Commodity Exchange Act preempts state gambling law as applied to its exchange.Checked Nov 8, 2026
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QCX LLC (d/b/a Polymarket US) v. Wilson
No. 2:26-cv-01502
Polymarket US moved for a preliminary injunction against Ohio enforcement (October 27, 2026), after suing over the October cease-and-desist letters on Commerce Clause and preemption grounds. The case is now before Chief Judge Morrison, who denied Kalshi’s Ohio injunction.Checked Nov 8, 2026
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No. 2:26-cv-02482
Polymarket US sued Louisiana’s Attorney General and Gaming Control Board, arguing federal preemption and that the state’s in-state sports-wagering licenses violate the Commerce Clause (October 27, 2026).Checked Nov 8, 2026
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Connecticut cease-and-desist orders to nine platforms (September 2026)
Also named: Robinhood, Coinbase, Crypto.com, Novig, Gemini, Webull, Underdog, ProphetX
Connecticut ordered nine more platforms to stop offering sports event contracts (September 10, 2026). By early October state officials had told reporters that ProphetX, Gemini and Webull had withdrawn from the state, and Underdog had sued.Checked Nov 8, 2026
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Mayor and City Council of Baltimore v. QCX LLC (Polymarket)
No. C-24-CV-26-005535 · No. 1:26-cv-03253
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 Nov 8, 2026
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QCX LLC (d/b/a Polymarket US) v. Torrez
No. 1:26-cv-02100
Stayed by agreement (August 2026) before any merits ruling.Checked Nov 8, 2026
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Coalition for Fair Markets v. Coleman
Also named: Kalshi, Crypto.com
Kalshi, Crypto.com and Polymarket US, through the Coalition for Fair Markets, sued to block Kentucky’s 14.25% prediction-market tax and its licensee contracting ban (June 12, 2026).Checked Nov 8, 2026
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Kentucky enforcement actions v. Kalshi & others (Franklin Circuit Court)
No. 26-CI-00689 · No. 26-CI-00696 · No. 3:26-cv-00048 · No. 3:26-cv-00047
Also named: Kalshi, Robinhood, Coinbase, Webull
Kentucky’s AG sued Kalshi, Polymarket, and distribution partners (June 2026), plus an excise tax; the CFTC then sued the state.Checked Nov 8, 2026
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State of Rhode Island v. KalshiEX LLC
No. PC-2026-02753 · No. 1:26-cv-00333
Also named: Kalshi
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 Nov 8, 2026
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QCX LLC (d/b/a Polymarket US) v. Campbell
No. 1:26-cv-10651
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 Nov 8, 2026
What Changed
November 2026
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People of the State of New York v. QCX LLC (d/b/a Polymarket US)
Polymarket US opposed New York’s motion to send the Attorney General’s petition back to state court. New York’s reply is due November 16.
S.D.N.Y. No. 1:26-cv-08338, ECF 26 (docket text)
October 2026
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Polymarket US sued Louisiana’s Attorney General and Gaming Control Board in the Eastern District of Louisiana, four days after Kalshi’s suit in the Western District. Besides preemption, it argues Louisiana’s in-state sports-wagering licenses violate the Commerce Clause.
Complaint, E.D. La. No. 2:26-cv-02482 -
QCX, LLC (d/b/a Polymarket US) v. Nessel
Polymarket US agreed to stop offering sports contracts in Michigan. A stipulated order ends new sports contracts and requires open positions to be closed by November 25, with the State forbearing while it complies; its Sixth Circuit appeal continues.
Michigan Gaming Control Board release (Oct. 28, 2026) -
QCX LLC (d/b/a Polymarket US) v. Wilson
Polymarket US moved for a preliminary injunction in its Ohio case, which had been reassigned to Chief Judge Sarah D. Morrison, who has Kalshi’s Ohio case. No schedule has been set.
S.D. Ohio No. 2:26-cv-01502, ECF 8 and 15 (docket text) -
Ohio Casino Control Commission cease-and-desist letters (October 2026)
Robinhood Derivatives agreed to stop offering new sports event contracts in Ohio by November 2, in exchange for the Casino Control Commission’s agreement not to enforce while the Sixth Circuit and Supreme Court appeals are pending.
Robinhood Markets, Form 10-Q for the quarter ended September 30, 2026 -
Ohio Casino Control Commission cease-and-desist letters (October 2026)
The Casino Control Commission ordered its own licensees, including sportsbooks and suppliers, to stop servicing platforms that offer sports event contracts in Ohio and to confirm compliance by October 30.
Ohio Casino Control Commission licensee notice (Oct. 20, 2026; PDF hosted by Sports Betting Dime)
24 more changes
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People of the State of New York v. QCX LLC (d/b/a Polymarket US)
New York moved on October 6 to send its petition against Polymarket US back to state court. Judge Abrams set the motion for briefing rather than pausing the case for the Second Circuit; Polymarket US’s opposition is due November 5 and New York’s reply November 16.
Order, S.D.N.Y. No. 1:26-cv-08338 (ECF 18) -
KalshiEX LLC v. Ellison; QCX LLC (Polymarket US) v. Ellison
No schedule was set at Minnesota’s October 15 conference. The magistrate judge ordered the State to explain by October 29 what facts it needs discovery on, such as whether an event contract is a swap, with objections due November 12, before he decides whether discovery happens at all.
Order, D. Minn. No. 0:26-cv-02661 (ECF 93) -
QCX LLC (d/b/a Polymarket US) v. Wilson
Polymarket US sued Ohio’s Attorney General and Casino Control Commission on the day its cease-and-desist compliance was due. It argues Ohio’s in-state licensing rules violate the Commerce Clause and are preempted by federal law.
Complaint, QCX LLC v. Wilson, S.D. Ohio No. 2:26-cv-01502 -
Missouri Attorney General cease-and-desist letters (September 2026)
Missouri’s thirty-day deadlines passed without a suit by the State. Novig and Crypto.com’s exchange sued in federal court instead; Kalshi, Polymarket, Robinhood and Underdog had not, as of the latest docket checks.
Complaint, Ludlow Exchange, LLC d/b/a Novig v. Hanaway, E.D. Mo. No. 4:26-cv-01780 -
Kentucky enforcement actions v. Kalshi & others (Franklin Circuit Court)
Our entry said Kentucky’s remand motion in the Kalshi action was still with the district judge. A magistrate judge recommended on October 14 that the Kalshi case go back to state court, as he did the same day in the Polymarket case; objections in the Kalshi action are now due November 12.
E.D. Ky. No. 3:26-cv-00048, R. 67 (docket text) -
Kentucky enforcement actions v. Kalshi & others (Franklin Circuit Court)
A federal magistrate judge recommended that Kentucky’s suit against Polymarket be sent back to state court. It is a recommendation, not a ruling; the district judge has not yet acted on it. Kentucky’s remand motion in the Kalshi action is still undecided.
Report and Recommendation, E.D. Ky. No. 3:26-cv-00047 (ECF 41) -
QCX LLC (d/b/a Polymarket US) v. James
Polymarket US moved for a preliminary injunction against New York enforcement and asked for oral argument. Judge Abrams had set the case for briefing rather than staying it for the Second Circuit appeals.
Notice of motion, S.D.N.Y. No. 1:26-cv-08345 (ECF 32) -
Ohio Casino Control Commission cease-and-desist letters (October 2026)
Ohio’s Casino Control Commission sent cease-and-desist letters to ten platforms and brokers (Underdog, Gemini, Coinbase, ProphetX, Novig, Robinhood, Polymarket US, Plus500, Moomoo and Webull), citing the Sixth Circuit’s September 25 decision. Each must confirm compliance by October 16.
Ohio Casino Control Commission letters, October 2, 2026
September 2026
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KalshiEX LLC v. Ellison; QCX LLC (Polymarket US) v. Ellison
Minnesota did not appeal the July 27 injunction against its prediction-market ban: the lead docket shows no notice of appeal after the sixty-day window closed September 25. The case moves to merits scheduling, with a conference reset to October 15.
D. Minn. No. 0:26-cv-02661 docket -
People of the State of New York v. QCX LLC (d/b/a Polymarket US)
Our entry left out that the Attorney General also sought a restraining order, and that Polymarket US removed the case before it was served or given an index number, so no state judge ruled. The removal relies on the federal-officer statute, arguing an exchange acts under the CFTC — the earlier New York removals are docketed on federal-question grounds. It is now before Judge Abrams.
Notice of removal, S.D.N.Y. No. 1:26-cv-08338 -
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 -
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 -
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 up to $100,000 per unauthorized sports-wagering offer.
NY Attorney General — Verified Petition -
Missouri Attorney General cease-and-desist letters (September 2026)
We said Missouri’s letter stated no deadline. All six letters give thirty days from their date, so the windows close October 16 for Kalshi, Polymarket, Crypto.com and Robinhood and October 17 for Novig and Underdog, after which the State says it will sue.
Missouri AG — letter to Kalshi -
Mayor and City Council of Baltimore v. QCX LLC (Polymarket)
Baltimore moved on September 16 to send its Polymarket case back to state court, which our copy missed; briefing runs through November 25. We also corrected the companion Kalshi case’s judge to Adam B. Abelson.
Order, D. Md. No. 1:26-cv-03253 (ECF 25) -
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.) -
Missouri Attorney General cease-and-desist letters (September 2026)
Missouri’s Attorney General told Kalshi, Polymarket, Crypto.com, Novig, Underdog and Robinhood to stop offering sports event contracts or be licensed and taxed as sportsbooks. No suit has been filed by either side.
Missouri AG — letter to Kalshi -
Connecticut cease-and-desist orders to nine platforms (September 2026)
Connecticut ordered nine more platforms — Polymarket, Coinbase, Crypto.com, Robinhood, ProphetX, Novig, Webull, Gemini and Underdog — to stop offering sports event contracts, and subpoenaed about thirty vendors, app stores and media organizations.
Governor of Connecticut — announcement -
State of Rhode Island v. KalshiEX LLC
Rhode Island’s case is formally consolidated with Kalshi’s own suit before Chief Judge McElroy, and Polymarket US is a co-defendant in it. We had described three parallel tracks and a separate CFTC suit; the CFTC intervened rather than suing.
Kalshi filing under the consolidated caption
August 2026
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Kentucky enforcement actions v. Kalshi & others (Franklin Circuit Court)
Kentucky’s June filings were two complaints, not one: the Kalshi action (No. 26-CI-00689, Judge Shepherd) names Kalshi with its brokers Robinhood, Webull and Coinbase, and Polymarket is sued separately. Kalshi removed its case to federal court; Kentucky’s remand motion was fully briefed August 31.
Kentucky AG — Kalshi complaint (No. 26-CI-00689) -
Mayor and City Council of Baltimore v. QCX LLC (Polymarket)
We had no federal docket for Baltimore’s Polymarket case. It is No. 1:26-cv-03253, removed August 17 and assigned to Judge Richard D. Bennett — not the judge who has the Kalshi case.
CourtListener — 1:26-cv-03253
June 2026
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Coalition for Fair Markets v. Coleman
Added to the tracker: the platforms’ own challenge to Kentucky’s 14.25% prediction-market tax and licensee contracting ban, filed by the Coalition for Fair Markets (Kalshi, Crypto.com’s exchange and Polymarket US) in Franklin Circuit Court as No. 26-CI-00667. Its claims now run through the federal case against Kentucky.
Complaint, Franklin Circuit No. 26-CI-00667 (E.D. Ky. ECF 18-2)
February 2026
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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
January 2026
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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