Title VII/ADA/ADEA Employee-Numerosity Is a Merits Element (Not Jurisdiction), Yet Summary Judgment Lies Where the Plaintiff Produces No Evidence of Coverage

Introduction

In Rhone v. Schmanke (10th Cir. Jan. 12, 2026), plaintiff-appellant Christopher L. Rhone, proceeding pro se, appealed the District of Kansas’s dismissal of his employment-discrimination suit against Kenneth Schmanke and K1 Hospitality LLC. Rhone alleged race, age, and disability discrimination under Title VII, the ADEA, and the ADA, plus state-law claims.

The appeal presented three practical issues that recur in employment cases: (1) whether an individual owner can be sued as an “employer” under these federal statutes when the complaint identifies the LLC as the employer; (2) whether the statutory “employee numerosity” requirement is jurisdictional or instead a merits element; and (3) what happens on appeal when the appellant fails to explain why the district court was wrong.

Summary of the Opinion

  • The Tenth Circuit affirmed the judgment.
  • It held Rhone waived appellate review because his opening brief did not meaningfully explain why the district court erred.
  • It found no abuse of discretion in the district court’s decision to decline supplemental jurisdiction over state-law claims after federal claims were dismissed.
  • It rejected the district court’s treatment of employee numerosity as jurisdictional (citing Arbaugh v. Y&H Corp.), but nonetheless affirmed because the record showed Rhone failed to create a genuine fact dispute that K1 met the statutory employee thresholds (and thus failed on an essential element of his federal claims).

The court also rejected Rhone’s attempt to invoke the integrated enterprise doctrine, agreeing with the district court that he provided no evidentiary basis to treat related entities as a single employer.

Analysis

Precedents Cited

1) Pro se construction—limits of leniency

Yang v. Archuleta, 525 F.3d 925, 927 n.1 (10th Cir. 2008), was cited for the familiar rule that pro se filings are construed liberally, but courts do not serve as the litigant’s advocate. This frames the opinion’s approach to briefing defects: leniency does not cure a failure to present arguments.

2) Jurisdictional “factual attacks” under Rule 12(b)(1)

The district court treated K1’s summary-judgment motion as a jurisdictional “factual attack.” The panel referenced Baker v. USD 229 Blue Valley, 979 F.3d 866, 872 (10th Cir. 2020), which explains that when a defendant mounts a factual attack on jurisdiction, the district court may consider affidavits and resolve disputed jurisdictional facts. The panel ultimately concluded that approach was mistaken in this context, because numerosity is not jurisdictional.

3) Integrated enterprise doctrine

The opinion cited Knowlton v. Teltrust Phones, Inc., 189 F.3d 1177, 1184 (10th Cir. 1999), for the “integrated enterprise doctrine,” under which related entities can be treated as a single employer for coverage purposes. The court affirmed rejection of the doctrine here because Rhone produced no evidence supporting integration sufficient to aggregate employees across entities.

4) Appellate waiver and reply-brief limits

The court relied on Nixon v. City & Cnty. of Denv., 784 F.3d 1364, 1366 (10th Cir. 2015), for the proposition that an appellant’s first task is to explain why the district court was wrong. It then cited Bronson v. Swensen, 500 F.3d 1099, 1104 (10th Cir. 2007), to hold that Rhone’s failure to do so in the opening brief waived review. It also cited Stump v. Gates, 211 F.3d 527, 533 (10th Cir. 2000), to reinforce that arguments raised for the first time in a reply brief are generally not considered.

5) Supplemental jurisdiction

On the district court’s decision to drop state-law claims, the panel cited Koch v. City of Del City, 660 F.3d 1228, 1248 (10th Cir. 2011), emphasizing the usual practice: when all federal claims are dismissed, the court may—and usually should—decline supplemental jurisdiction over remaining state claims.

6) Numerosity is not jurisdictional

The pivotal correction is grounded in Arbaugh v. Y&H Corp., 546 U.S. 500, 516 (2006). Arbaugh held Title VII’s employee-numerosity threshold is an element of the claim, not a jurisdictional prerequisite. The panel also cited Swallows v. Barnes & Noble Book Stores, Inc., 128 F.3d 990, 992 n. 2 (6th Cir. 1997), noting Title VII, the ADEA, and the ADA define “employer” in essentially similar terms—supporting the panel’s treatment of numerosity as a merits element across these statutes.

7) Affirmance on any ground supported by the record; summary judgment standards

Even though the district court used the wrong procedural lens (jurisdiction), the panel affirmed under an alternative merits rationale, invoking Ellis v. J.R.'s Country Stores, Inc., 779 F.3d 1184, 1192 (10th Cir. 2015), which permits affirmance on any record-supported ground if the appellant had a fair chance to address it. It cited Byrnes v. St. Catherine Hosp., 158 F.4th 1107, 1120 (10th Cir. 2025), for de novo review of summary judgment, and applied Rule 56’s “no genuine dispute as to any material fact” standard.

Legal Reasoning

  1. Individual liability dismissal (owner vs. employer): The district court dismissed claims against Schmanke because Title VII, the ADEA, and the ADA authorize suits against the “employer,” and the complaint identified K1—not Schmanke—as Rhone’s employer. On appeal, Rhone did not directly and coherently challenge that ruling in his opening brief, reinforcing affirmance.
  2. Appellate waiver as a gatekeeping doctrine: The panel treated briefing adequacy as dispositive. By failing to explain why the district court was wrong, Rhone triggered waiver under Nixon and Bronson, and could not reliably cure deficiencies in the reply brief under Stump.
  3. Supplemental jurisdiction follows the federal claims: Once the federal claims were dismissed, Koch supported the routine decision to let state courts decide state-law questions.
  4. Numerosity mischaracterized as jurisdictional, but still fatal on the merits: The panel recognized the district court’s error in treating employee numerosity as a Rule 12(b)(1) jurisdictional matter, because Arbaugh makes it a merits element. Yet the panel affirmed because, under Rule 56, Rhone produced no evidence creating a genuine dispute that K1 employed enough employees to be covered.
  5. Integrated enterprise doctrine requires proof: Rhone’s attempt to aggregate employees across entities failed for lack of supporting evidence. Citing Knowlton, the panel agreed that without facts showing functional integration, the doctrine cannot expand coverage.

Impact

  • Procedural clarity: The decision reinforces, in line with Arbaugh, that numerosity is not jurisdictional—district courts should treat it as a merits issue (typically at summary judgment or trial), not as a subject-matter jurisdiction defect.
  • Practical burden for plaintiffs: Plaintiffs must be prepared to produce evidence on statutory coverage—headcount evidence, payroll records, admissions, or discovery—because failure can end the case even when the court’s initial procedural framing is imperfect.
  • Integrated enterprise doctrine remains evidence-driven: Mere assertion of related businesses is insufficient; plaintiffs need facts supporting aggregation under Knowlton.
  • Appellate practice discipline: The waiver holding underscores that even pro se appellants must articulate reversible error in the opening brief; otherwise, merits arguments may never be reached.
  • State claims routinely remanded (in effect): By affirming the declination of supplemental jurisdiction, the decision signals that plaintiffs should anticipate litigating state claims separately if federal claims are dismissed early.

Complex Concepts Simplified

Employee numerosity requirement
Federal employment statutes apply only if the defendant meets a minimum employee count (e.g., Title VII and ADA: 15+; ADEA: 20+). This is a “coverage” element the plaintiff must prove, not a question of whether the federal court has power to hear the case.
Jurisdiction vs. merits
“Jurisdiction” asks whether a court may hear a type of case at all. “Merits” asks whether the plaintiff can prove the elements needed to win. After Arbaugh, Title VII’s numerosity threshold is merits, not jurisdiction.
Summary judgment (Rule 56)
A case can end before trial if the evidence shows there is no genuine dispute about a fact that matters to the outcome. If the plaintiff has no evidence that the employer meets the statutory headcount, the defendant can win as a matter of law.
Integrated enterprise doctrine
A rule allowing courts, in limited circumstances, to treat related entities as one “employer” and combine their employees. It requires evidence of integration; it is not automatic just because businesses are affiliated.
Supplemental jurisdiction
Federal courts may hear state-law claims that are related to federal claims. But if the federal claims are dismissed, federal courts usually dismiss the state claims without deciding them, leaving them for state court.
Appellate waiver
On appeal, the appellant must identify specific errors and explain why they matter. If the opening brief does not do this, the appellate court may treat issues as waived.

Conclusion

Rhone v. Schmanke is a procedural-and-proof-centered disposition with two core lessons. First, consistent with Arbaugh v. Y&H Corp., employee numerosity under Title VII (and by extension in this opinion’s reasoning, the ADA and ADEA) is a merits element, not a jurisdictional bar. Second, that correction does not save a plaintiff who produces no evidence that the defendant meets the statutory headcount or that related entities should be aggregated under the integrated enterprise doctrine. The opinion also underscores that appellate courts will enforce briefing requirements—even for pro se litigants—and that state-law claims commonly exit federal court once federal claims fall away.