Case: 25-7504, 01/16/2026, DktEntry: 38.1, Page 1 of 47
No. 25-7504 UNITED STATES COURT OF APPEALS FOR THE NINTH CIRCUIT _______________________________________
B LUE L AKE R ANCHERIA , C HICKEN R ANCH R ANCHERIA OF M E -W UK I NDIANS , and P ICAYUNE R ANCHERIA OF THE C HUKCHANSI I NDIANS , Plaintiffs-Appellants, v. K ALSHI I NC ., K ALSHI EX LLC, R OBINHOOD M ARKETS , I NC ., and R OBINHOOD D ERIVATIVES LLC, Defendants-Appellees. _______________________________________ On Appeal from an Order of the United States District Court for the Northern District of California (No. 25-cv-6162) (Corley, J.) _______________________________________ BRIEF OF MASSACHUSETTS, CALIFORNIA, 25 OTHER STATES, AND THE DISTRICT OF COLUMBIA AS AMICI CURIAE IN SUPPORT OF APPELLANTS AND REVERSAL _______________________________________ R OB B ONTA Attorney General of California C HRISTINE W ILLIAMS Senior Assistant Attorney General N OEL F ISCHER Supervising Deputy Attorney General 1515 Clay Street Oakland, CA 94612
A NDREA J OY C AMPBELL Attorney General of Massachusetts M. P ATRICK M OORE First Assistant Attorney General J ARED R INEHIMER Chief, Privacy & Responsible Technology Division G ERARD J. C EDRONE Deputy State Solicitor L OUISA C ASTRUCCI A LDA C HAN F RANCES C OHEN J OSHUA R. E DLIN Assistant Attorneys General One Ashburton Place Boston, MA 02108 (617) 963-2282 gerard.cedrone@mass.gov
(Additional counsel listed at pages 36-38)
January 16, 2026
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