Notice of Related Case (s) 2:26-cv-1062, by Plaintiff Robinhood Derivatives LLC. (Payson, Kenneth)

(3:26-cv-05311-TMC) - 1

Davis Wright Tremaine LLP LAW OFFICES 920 Fifth Avenue, Suite 3300 Seattle, WA 98104-1610 206.622.3150 main · 206.757.7700 fax The Honorable Tiffany M. Cartwright UNITED STATES DISTRICT COURT WESTERN DISTRICT OF WASHINGTON AT TACOMA ROBINHOOD DERIVATIVES, LLC, Plaintiff,

v. TINA GRIFFIN, in her official capacity as Executive Director of the Washington State Gambling Commission; ALICIA LEVY, in her official capacity as Chair of the Washington State Gambling Commission; SARAH LAWSON, in her official capacity as Vice Chair of the Washington State Gambling Commission; NOAH SKARTVEDT, in his official capacity as Commissioner of the Washington State Gambling Commission; MICHAEL CHARLES, in his official capacity as Commissioner of the Washington State Gambling Commission; and NICHOLAS W. BROWN, in his official capacity as Attorney General for the State of Washington,

Defendants. No. 3:26-cv-05311-TMC NOTICE OF RELATED CASE

Pursuant to Local Civil Rule 3(g), Plaintiff Robinhood Derivatives, LLC (“Robinhood”) provides this notice to the Court that the present action may be related to another action currently proceeding before Judge Coughenour in the Western District of Washington, State of Washington v. KalshiEx, LLC, No. 2:26-cv-1062 (W.D. Wash.) (removed from King Cnty. Super. Ct. No. 26- 2-10264-3) (“Kalshi Action”).

(3:26-cv-05311-TMC) - 2

Davis Wright Tremaine LLP LAW OFFICES 920 Fifth Avenue, Suite 3300 Seattle, WA 98104-1610 206.622.3150 main · 206.757.7700 fax

The parties to the two actions are not identical. The two actions do concern substantially similar events, namely the State of Washington’s attempts to apply its gambling-related statutes to federally regulated event contracts traded on Commodity Futures Trading Commission-designated contract markets. The two actions arise in a different procedural posture: the Kalshi Action involves Kalshi’s removal of a state court enforcement action to federal court, and the present action involves Robinhood’s request for declaratory and injunctive relief against Washington officials based on the real and imminent threat that Washington will initiate an enforcement action regarding those same Washington laws against Robinhood.

DATED this 13th day of April, 2026.

DAVIS WRIGHT TREMAINE LLP By s/ Kenneth E. Payson Kenneth E. Payson, WSBA #26369 920 Fifth Avenue, Suite 3300 Seattle, WA 98104 Telephone: (206) 622-1610 Fax: (206) 757-7700 Email: [email protected] CRAVATH, SWAINE & MOORE LLP Kevin J. Orsini* Antony L. Ryan* Brittany L. Sukiennik* 375 Ninth Avenue New York, New York 10001 Telephone: (212) 474-1000 Fax: (212) 474-3700 Email: [email protected] [email protected] [email protected] *admitted pro hac vice Attorneys for Plaintiff Robinhood Derivatives, LLC