Wyo. Stat. § 2-3-913: Situs.

(a) This act shall be construed as pertaining to the administration of a trust and shall be available to any trust that is administered in Wyoming under Wyoming law unless:

(i) The governing instrument reflects an intention that the beneficiary or beneficiaries are to receive an amount other than a reasonable current return from the trust;

(ii) The trust is a trust described in Internal Revenue Code §§ 170(f)(2)(B), 664(d), 2702(a)(3) or 2702(b); or

(iii) The governing instrument expressly prohibits use of this act by specific reference to this act.