Can I file a claim in the Josephson v. Kalshi Data Breach Class Action case?

No. The case is still being litigated — there is no settlement, no claim form, and no payout. It was filed May 18, 2026 in the District Court, S.D. New York (No. 1:26-cv-04126).

Who are the attorneys in the Josephson v. Kalshi Data Breach Class Action?

For the plaintiffs: Russell Busch (Bryson Harris Suciu & DeMay PLLC). For Kalshi, Inc.: Sean M. Murphy (Milbank Tweed Hadley and McCloy LLP); Matthew Charles Wasserman (Dinsmore); Matthew Laroche (Milbank LLP); Katherine Fell (Milbank LLP). From the public court docket.

In litigation — no settlement yetdata breachprivacy

Josephson v. Kalshi Data Breach Class Action

Verified September 19, 2026Found via the federal court docketHow ClaimWatch verifies cases

Still being litigated: the claims below are allegations, not findings, and there is no settlement, claim form or payout yet.

Where this case stands

In litigation

The case has been filed and is being fought in court. There is no settlement, no claim form and no payout yet; many class actions are dismissed or never certified.

Pending in the District Court, S.D. New York (No. 1:26-cv-04126).

May 18, 2026
Case filed

What happened

A proposed class action against Kalshi, Inc. and related entities, apparently concerning fraud. The case was voluntarily dismissed without prejudice shortly after filing, suggesting either procedural issues or potential settlement discussions early in litigation.

Do you qualify?

No settlement exists yet, so there is nothing to file and no class definition to check. If the case settles, the settlement will define exactly who qualifies — watch this case and we'll let you know.

How to file

There is no claim to file yet. If this case reaches a settlement, a claim process will open — usually with an official settlement website and a filing deadline.

Common questions

Can I file a claim in the Josephson v. Kalshi Data Breach Class Action case?: No. The case is still being litigated — there is no settlement, no claim form, and no payout. It was filed May 18, 2026 in the District Court, S.D. New York (No. 1:26-cv-04126).What a class action lawsuit is →
Who are the attorneys in the Josephson v. Kalshi Data Breach Class Action?: For the plaintiffs: Russell Busch (Bryson Harris Suciu & DeMay PLLC). For Kalshi, Inc.: Sean M. Murphy (Milbank Tweed Hadley and McCloy LLP); Matthew Charles Wasserman (Dinsmore); Matthew Laroche (Milbank LLP); Katherine Fell (Milbank LLP). From the public court docket.

Who's involved

Plaintiffs

Temuujin Shaariibuu
Tyrone Stuckey
Luis Cuevas
Brett Josephson

Defendants

Kalshi Trading LLC
Kalshi Klear Inc.
Kalshi Klear LLC
KalshiEX LLC
Kalshi Inc.

Counsel for plaintiffs

Russell Busch Bryson Harris Suciu & DeMay PLLC
Represents Brett Josephson, Luis Cuevas, Tyrone Stuckey, Temuujin Shaariibuu
12 tracked cases
rbusch@brysonpllc.com · (919) 926-7948

Counsel for defendants

Sean M. Murphy Milbank Tweed Hadley and McCloy LLP
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
2 tracked cases
(212) 530-5688
Matthew Charles Wasserman Dinsmore
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
2 tracked cases
(312) 837-4316
Matthew Laroche Milbank LLP
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
4 tracked cases
(212) 530-5514
Katherine Fell Milbank LLP
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
5 tracked cases
Joshua Sterling Milbank LLP
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
3 tracked cases
(202) 835-7535
Ashley Satterlee Milbank LLP
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
4 tracked cases
Andrew Porter Milbank LLP
Represents Kalshi Inc., KalshiEX LLC, Kalshi Klear LLC, Kalshi Klear Inc., Kalshi Trading LLC
5 tracked cases · $117.8M in disclosed settlements defended

Other cases these firms appear in

Unison Home Equity Agreement Class Action · Bryson Harris Suciu & DeMay PLLC
IDscan.net Class Action · Bryson Harris Suciu & DeMay PLLC
Rioux v. IDscan.net Data Breach Class Action · Bryson Harris Suciu & DeMay PLLC
Sharecare Contract Class Action · Bryson Harris Suciu & DeMay PLLC
Josephson v. Kalshi Class Action · Milbank Tweed Hadley and McCloy LLP

From the public court docket, contact details as filed; not an endorsement.

In the news

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Guides:What is a class action lawsuit?How class membership works Your options as a class member

Summarised from public settlement documents; confirm terms on the official settlement website. ClaimWatch is not a law firm, and filing a claim is free.