2026 Membership Book FINAL

Case 1:25-cv-12578-RGS Document 41 Filed 10/16/25 Page 2 of 7

the Defendants’ combined motion to dismiss and response to Robinhood Derivatives, LLC’s (“Robinhood”) motion for preliminary injunction. 2 INTEREST OF THE TRIBAL AMICI IGA is an inter-tribal non-profit organization comprised of 124 federally recognized Indian Tribes that operate gaming enterprises throughout Indian Country. IGA also has 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. To pursue this mission, IGA operates as an educational and public-policy resource for tribes, policy makers, and members of the public concerning Indian gaming issues and tribal community development. 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 range of issues involving tribal sovereignty, self-government, treaty rights, and policies affecting Tribal Nations, including jurisdiction, taxation, and gaming issues. NCAI currently represents more than 275 Tribal Nations. NCAI works daily to strengthen the ability of Tribal Nations to ensure the health and welfare of their communities. CNIGA is a non-profit organization that represents 54 federally recognized tribal governments located within the State of California. CNIGA acts as a planning and coordinating

2 The undersigned counsel, who do not represent any party to this suit, authored this motion and the accompanying brief. The Tribal Amici paid the entire cost of this amicus brief. None of the Tribal Amici are party to this suit. Accordingly, no party to this suit contributed money for the preparation of this amicus brief.

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