2026 Membership Book FINAL

Case 1:25-cv-08846-AT Document 60-1 Filed 12/03/25 Page 7 of 31

INTRODUCTION AND INTERESTS OF AMICI CURIAE The Indian Gaming Association (“IGA”), National Congress of American Indians (“NCAI”), Washington Indian Gaming Association (“WIGA”), California Nations Indian Gaming Association (“CNIGA”), Arizona Indian Gaming Association (“AIGA”), Minnesota Indian Gaming Association (“MIGA”), Oklahoma Indian Gaming Association (“OIGA”), United South and Eastern Tribes Sovereignty Protection Fund (“USET SPF”), San Manuel Gaming and Hospitality Authority (“SMGHA”), and 17 federally recognized Indian Tribes (“Amici Tribes”) 1 (collectively, “Tribal Amici”) submit this amicus curiae brief in support of the Defendants’ response to KalshiEX, LLC’s (“Kalshi”) motion for preliminary injunction and temporary restraining order. IGA is an inter-tribal non-profit organization comprised of 124 federally recognized Indian Tribes that operate gaming enterprises throughout Indian Country and other non-voting members, which represent organizations, tribes, and businesses engaged in tribal gaming enterprises around the country. IGA’s mission is to advance tribal economic, social, and political interests, and to preserve and promote tribal sovereignty, self-sufficiency, and economic development by advocating for tribally owned governmental gaming enterprises. NCAI is the oldest and largest national organization comprised of American Indian and Alaska Native tribal governments and their citizens. Since 1944, NCAI has advised and educated the public, tribal nations, state governments, and the federal government on a broad 1 The Amici Tribes include: Agua Caliente Band of Cahuilla Indians; Elk Valley Rancheria; Karuk Tribe; Kickapoo Traditional Tribe of Texas; Klamath Tribes; Lytton Rancheria of California; Mashantucket Pequot Tribal Nation; Mescalero Apache Tribe of the Mescalero Reservation; Pechanga Band of Indians; Picayune Rancheria of Chukchansi Indians of California; Pueblo of Acoma; Pueblo of Sandia; Rincon Band of Luiseño Indians; Santa Ynez Band of Chumash Mission Indians; Seminole Tribe of Florida; Table Mountain Rancheria; and Yuhaaviatam of San Manuel Nation.

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