2026 Membership Book FINAL

Case 3:25-cv-06162-JSC Document 35 Filed 09/04/25 Page 24 of 34

easily subject to valuation.” Prairie Band of Potawatomi Indians v. Pierce , 253 F.3d 1234, 1250

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(10th Cir. 2001); see also EEOC v. Karuk Tribe Hous. Auth. , 260 F.3d 1071, 1077 (9th Cir. 2001)

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(“Assuming that the Tribe is correct in its analysis with respect to jurisdiction, the prejudice of

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subjecting the Tribe to a subpoena for which the agency does not have jurisdiction results in

irreparable injury vis-a-vis the Tribe’s sovereignty.”); Choctaw Nation of Oklahoma v. State of

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Oklahoma , 724 F. Supp. 2d 1182, 1187 (W.D. Okla. 2010) (holding remedies at law are inadequate

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to remedy unlawful assertions of state jurisdiction in Indian Country).

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While the court decisions addressing the irreparable injury arising from encroachment on

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tribal sovereignty have usually involved attempts by states to extend their jurisdictional reach to

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activities on Indian lands, the reasoning of those decisions applies equally well to Kalshi

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conducting class III gaming on Indian lands in violation of IGRA and the Tribes’ laws.

Tribes have the exclusive authority 8 to conduct, or to authorize a third-party entity to

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conduct, 9 gaming pursuant to a compact or procedures on their Indian lands, in accordance with

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IGRA and its implementing regulations. Kalshi’s conducting of class III gaming on Indian lands

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without authorization from a tribe pursuant to a compact, secretarial procedures, or a management

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contract impermissibly encroaches upon and interferes with the right and ability of the Tribes to

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regulate that gaming and, thereby, to govern themselves. Ramos Decl. ¶¶ 38-40; Declaration of

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Joseph Mathiesen-Powell in Support of Plaintiffs’ Motion for a Preliminary Injunction

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(“Mathiesen-Powell Decl.”) ¶ 27; Declaration of Ian DeVries in Support of Plaintiffs’ Motion for

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a Preliminary Injunction (“DeVries Decl.”) ¶¶ 3-7; Declaration of Steve Carrillo in Support of

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Plaintiffs’ Motion for a Preliminary Injunction (“Carrillo Decl.”) ¶¶ 12-17.

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15 NOTICE OF MOTION AND MEMORANDUM OF POINTS AND AUTHORITIES [ Case No.: 25-cv-06162-JSC] 9 See 25 U.S.C. §§ 2710(d)(9) and 2711; 25 C.F.R. § 502.15 (establishing a regulatory mechanism by which tribes can enter into a contract that “provides for the management of all or part of a gaming operation.”); 25 C.F.R. § 533.7 (establishing by regulation that unapproved management contracts are void ab initio); Catskill Dev., L.L.C. v. Park Place Entm’t Corp. , 547 F.3d 115, 120 (2d Cir. 2008). 8 Cal. Const. Art. IV. § 19 (f)(giving California Indian Tribes the exclusive right to utilize slot machines and play house banked and percentage card games), see also, In re Indian Gaming Related Cases , 331 7. 3d 1094 (9 th Circ. 2003)

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