Analogous to permissive intervention and intervention as of right, third-party standing relates to when someone other than an existing party to a lawsuit has the ability to make a claim or objection in a lawsuit.
To have third-party standing, a litigant must show: (1) a concrete injury, (2) a close relation to the third-party and (3) some hindrance to the third party’s ability to protect its own interests. State v. Knese, 985 S.W.2d 759, 775 (Mo. 1999). State ex rel. Delmar Gardens North Operating, LLC v. Gaertner, 239 S.W.3d 608, 610 (Mo. 2007).