Opinion Summary: Hain Celestial Group v. Palmquist

Hain Celestial Group, Inc. v. Palmquist | Date Decided: 2/24/26 | Oral Argument Date: 11/4/25 | Docket Link: HereOverviewToday, the Supreme Court hears oral arguments in Hain Celestial Group versus Palmquist, a forum fight about when courts keep cases they never should have had. A Texas family sued two companies over their child's heavy metal poisoning from baby food—but after a federal court wrongly kicked out one defendant and ran a two-week trial, an appeals court said the case never belonged in federal court, forcing everyone back to square one.Questions Presented:Whether a district court's final judgment as to completely diverse parties must be vacated when an appellate court later determines that it erred by dismissing a non-diverse party at the time of removal.Whether a plaintiff may defeat diversity jurisdiction after removal by amending the complaint to add factual allegations that state a colorable claim against a nondiverse party when the complaint at the time of removal did not state such a claim.Holding: Because the federal trial court wrongly dismissed Whole Foods Market, the federal courts lacked jurisdiction to hear the case.Result: Affirmed.Voting Breakdown: 9-0. Justice Sotomayor delivered the opinion for a unanimous Court. Justice Thomas filed a concurring opinion.Link to Opinion: Here.Oral Advocates:For Petitioner (Hain and Whole Foods): Sarah E. Harrington, Washington, D.C.For Respondent (Palmquist): Russell S. Post, Houston, Texas