This case asks the Court to determine whether an appellate court must vacate a district court’s final judgment if it determines the district court erred in dismissing a non-diverse party when the case was removed. The Hain Celestial Group (“Hain”), as Petitioner, argues that the district court had jurisdiction to enter final judgment because the parties before it were completely diverse after Whole Foods, Inc. (“Whole Foods”) was dismissed. Alternatively, Hain argues Whole Foods could be dismissed under Federal Rule of Civil Procedure 21 as a dispensable party. Sarah Palmquist, Grant Palmquist, and E.P. (the “Palmquists”), as Respondents, argue that Whole Foods remained a part of the litigation until the final judgment, destroying the district court’s subject matter jurisdiction. Alternatively, the Palmquists argue that Hain’s Rule 21 argument is improper and would result in prejudice to them. The outcome of this case could impact forum shopping strategies and increase the resources parties must expend if they must relitigate claims after a final judgment is vacated.