Sixth Circuit Rejects “Close-and-Significant-Relationship” Privity for Nonparty Claim Preclusion; Parent–Subsidiary Status Alone Does Not Bar a Second Suit

I. Introduction

In Diamond Williams v. Mastronardi Produce-USA, Inc., the Sixth Circuit addressed a recurring res judicata problem: a plaintiff sues the “wrong” corporate entity (here, the parent), loses on the ground that the parent was not her employer, and then sues the subsidiary that allegedly was the employer. The key question was whether the subsidiary—Mastronardi Produce-USA, Inc. (“USA”)—could invoke claim preclusion based on the judgment won by its parent—Mastronardi Produce, Ltd. (“Canada”)—in the prior suit.

The district court dismissed Williams’s second suit, holding that USA and Canada were “privies” under a “close-and-significant-relationship” test used in some other circuits, and reasoning that Williams should not get “a second bite at the apple.” The Sixth Circuit reversed, holding that nonparty claim preclusion must be grounded in the Supreme Court’s six recognized exceptions, not a free-floating “close relationship” concept.

II. Summary of the Opinion

The Sixth Circuit held that the district court erred by adopting the “close-and-significant-relationship” test to find privity between a parent and its wholly owned subsidiary. Under Taylor v. Sturgell, a nonparty generally cannot be bound by a judgment unless one of six recognized exceptions applies. USA failed to show that any relevant exception applied:

  • The “pre-existing substantive legal relationship” exception did not apply because parent–subsidiary status does not create the kind of property-based successive interest historically associated with binding “privies,” and, in any event, the discrimination claims were not about any such property interest.
  • The “control” exception did not apply because the record showed coordination at most, not that USA had effective control over Canada’s litigation choices.
  • The “adequate representation” exception did not apply because—under Sixth Circuit precedent—adequate representation requires alignment of interests plus special protective procedures or an understanding of representative litigation, which were absent.

The court also noted—without deciding—that USA’s late-raised issue-preclusion theory appeared conceptually confused, because the prior case determined Canada was not the employer, so preclusion would bar Williams from claiming Canada was her employer, not force her to keep claiming it.

III. Analysis

A. Precedents Cited

1. The governing framework: Taylor v. Sturgell

The opinion is built around Taylor v. Sturgell, 553 U.S. 880 (2008), which states that, as a general rule, a judgment does not bind nonparties, subject to six recognized exceptions (consent; substantive legal relationship; adequate representation; control; relitigation by proxy/agent; special statutory scheme). The Sixth Circuit treats Taylor as displacing looser “privity” shorthand and requiring a category-by-category fit.

2. Sixth Circuit “privity” before and after Taylor: Becherer, Amos, 202 N. Monroe

The court explained that pre-Taylor Sixth Circuit doctrine, exemplified by Becherer v. Merrill Lynch, Pierce, Fenner & Smith, Inc., 193 F.3d 415 (6th Cir. 1999) (en banc), used “privity” as an umbrella for multiple concepts (successor interest, control, adequate representation). After Taylor, the Sixth Circuit’s inquiry is whether one of the Taylor exceptions is satisfied.

For adequate representation, the court relied heavily on Amos v. PPG Industries, Inc., 699 F.3d 448 (6th Cir. 2012), and cited 202 N. Monroe, LLC v. Sower, 850 F.3d 265 (6th Cir. 2017). These cases require more than similar interests; they require “special procedures” (e.g., class certification-type protections) or an understanding that the first litigant acted in a representative capacity.

3. Rejection of other circuits’ “close relationship” approaches: Airframe Sys. and Elbert

The Sixth Circuit expressly rejected approaches exemplified by Airframe Sys., Inc. v. Raytheon Co., 601 F.3d 9 (1st Cir. 2010) and Elbert v. Carter, 903 F.3d 779 (8th Cir. 2018), which had permitted preclusion based on a “close and significant relationship.” The panel emphasized that Taylor supplies the controlling framework and does not turn on which side of the “v.” the new party appears.

The court supported this methodological point with Bucklew v. Precythe, 587 U.S. 119 (2019) (“just as binding as holding is the reasoning”), using it to reject efforts to confine Taylor to its facts.

4. Claim preclusion basics and procedural posture: New Hampshire, Montana, Sheldon, Chapman, VCST Int’l

The opinion situated claim preclusion in the standard formulation that it bars successive litigation of the same claim after a final judgment: New Hampshire v. Maine, 532 U.S. 742 (2001). It reiterated the “full and fair opportunity to litigate” rationale from Montana v. United States, 440 U.S. 147 (1979), as quoted in Taylor.

On review and pleading posture, the panel cited United States ex rel. Sheldon v. Kettering Health Network, 816 F.3d 399 (6th Cir. 2016) (de novo review of res judicata and 12(b)(6) dismissals), Chapman v. JPMorgan Chase Bank, N.A., 651 F. App’x 508 (6th Cir. 2016) (dismissal appropriate only if preclusion is conclusively established from the complaint plus judicially noticeable records), and VCST Int’l B.V. v. BorgWarner Noblesville, LLC, 142 F.4th 393 (6th Cir. 2025) (plaintiff need not plead around affirmative defenses). The court also cited out-of-circuit cases Stevens v. St. Tammany Par. Gov’t and Parungao v. Cmty. Health Sys., Inc. as consistent authority on considering prior public records at the motion-to-dismiss stage.

5. The “substantive legal relationship” exception and its property roots: Coke, Blackstone, Greenleaf, Freeman; Bigelow

In a notably historical analysis, the court rooted the “pre-existing substantive legal relationship” exception in property-based privity traditions: it cited Edward Coke, William Blackstone, Simon Greenleaf, and A.C. Freeman, and relied on Bigelow v. Old Dominion Copper Mining & Smelting Co., 225 U.S. 111 (1912) for the proposition that common-law “privity” denotes a “mutual or successive relationship to the same rights of property,” and that joint tortfeasors are not in privity for res judicata purposes.

6. Corporate separateness: Dole Food and Galette

To explain why parent and wholly owned subsidiary do not share a single, identical set of rights and liabilities, the court cited Dole Food Co. v. Patrickson, 538 U.S. 468 (2003) and Galette v. N.J. Transit Corp., 607 U.S. 509 (2026), emphasizing that separate corporate existence is a core feature of the corporate form.

7. Control doctrine: Becherer, Benson & Ford, Leaf, Vulcan

For the control exception, the court leaned on Becherer’s demanding standard (effective choice of legal theories/proofs and control over appellate review), quoting Benson & Ford, Inc. v. Wanda Petroleum Co., 833 F.2d 1172 (5th Cir. 1987). It also cited Leaf v. Refn, 742 F. App’x 917 (6th Cir. 2018) (control is factual) and Vulcan, Inc. v. Fordees Corp., 658 F.2d 1106 (6th Cir. 1981) (privity/control as factual questions).

8. Issue preclusion clarification: Ga.-Pac. and procedural restraint: PCC Airfoils

On issue preclusion, the court cited Ga.-Pac. Consumer Prods. LP v. Four-U-Packaging, Inc., 701 F.3d 1093 (6th Cir. 2012) for the goal of avoiding inconsistent decisions, and PCC Airfoils, LLC v. Daughtery, 176 F.4th 509 (6th Cir. 2026) for the principle that arguments not raised below are generally better addressed by the district court first.

B. Legal Reasoning

1. The core holding: no “close relationship” shortcut—use the Taylor exceptions

The opinion’s central move is doctrinal: it treats Taylor as a mandatory framework that cabins nonparty preclusion to specified categories. The district court’s equitable frustration—Williams’s refusal to substitute USA in the first case—could not justify expanding nonparty preclusion beyond those categories. In effect, the Sixth Circuit reaffirmed that res judicata is not a general anti-duplicative-litigation power when a new defendant was not a party to the first case.

2. Substantive legal relationship: parent–subsidiary is not the common-law property privity that matters here

The court’s analysis has two steps:

  1. Historically, “privity” that binds nonparties is largely about successive or identical property interests (heirs, assignors/assignees, executors, etc.). This is consistent with the Restatement approach the court cited (see Restatement (Second) of Judgments § 43) and commentary in 18A Wright & Miller’s Federal Practice & Procedure § 4448.
  2. Even if parent ownership of subsidiary shares creates a property relationship, it is not the property interest in dispute in an employment discrimination case. Williams alleged tort-like statutory wrongs (discrimination/retaliation), and the court emphasized that joint tortfeasors are not in privity under Bigelow.

The court used an accessible analogy (father/son hunting mishap) to show why a property-based relationship does not automatically carry over to tort liability. The message is practical: corporate ownership does not mean a parent and subsidiary “stand in each other’s shoes” for purposes of being sued for workplace misconduct.

3. Control: coordination, shared counsel, and shared evidence are not enough

USA argued that it effectively controlled Canada’s defense because the entities shared counsel, USA offered to substitute as defendant, and a corporate officer’s declaration supported Canada’s argument that Canada was the wrong entity. The Sixth Circuit held this fell short of the “high bar” for control: the record did not show that USA had the effective right to pick Canada’s legal theories and proofs or to control appellate review.

The court also highlighted a factual asymmetry: USA was the subsidiary, yet it claimed it controlled its parent’s litigation decisions. The mere parent–subsidiary relationship did not make that inference plausible at the motion-to-dismiss stage.

4. Adequate representation: Amos forecloses preclusion without “special procedures” or representative litigation

The panel treated Amos v. PPG Industries, Inc. as dispositive. Even if USA and Canada had aligned incentives (both wanted Canada to win), “adequate representation” for nonparty preclusion requires additional procedural safeguards—class-like protections or a clear representative posture. No such procedures existed, and USA identified no “understanding” that Canada litigated on USA’s behalf.

The district court’s considerations—close relationship, hindsight view that USA “should have been joined,” and fairness concerns about a “second bite”—were therefore legally irrelevant under the Sixth Circuit’s post-Taylor framework.

5. Motion-to-dismiss discipline: preclusion must be “conclusively” established

Finally, the opinion reinforces pleading-stage limits: because claim preclusion is an affirmative defense, dismissal under Rule 12(b)(6) is proper only when the complaint and judicially noticeable prior-case records conclusively establish preclusion. That standard is demanding in nonparty contexts precisely because the doctrine is exceptional.

C. Impact

1. A clear Sixth Circuit rule against “relationship-based” nonparty claim preclusion

The decision announces a strong, administrable rule for the circuit: courts may not use a “close-and-significant-relationship” test as a substitute for Taylor’s six exceptions. This is likely to reduce unpredictable, equity-driven dismissals where corporate family relationships exist but the new defendant was not a party.

2. Corporate group litigation: parent and subsidiary do not automatically share res judicata defenses

For corporate defendants, the opinion signals that wholly owned subsidiaries cannot rely on the parent’s win unless they can satisfy a specific Taylor exception (most plausibly “control,” but only with concrete evidence, not inference). Conversely, corporate plaintiffs and employees get some protection against being permanently shut out merely for naming the wrong entity first.

3. Litigation strategy in employment cases: entity identification errors are less fatal (but not costless)

The ruling makes it harder to convert an “incorrect defendant” first suit into a complete bar against the correct defendant. That said, the opinion leaves room for:

  • Issue preclusion to narrow disputes (e.g., the prior finding that Canada was not the employer);
  • possible sanctions or cost consequences in extreme cases (not addressed here); and
  • defendants to develop a factual record for “control” or other exceptions at later stages.

IV. Complex Concepts Simplified

Claim preclusion (res judicata)
A rule that can bar an entire later lawsuit when the same claim (or one that should have been brought) was already finally decided. It usually applies only to the same parties (or those who fit a recognized nonparty exception).
Issue preclusion (collateral estoppel)
A narrower rule: it prevents relitigation of a specific issue of fact or law that was actually decided and necessary to the prior judgment. It does not automatically eliminate all claims; it can instead remove particular contested points (e.g., “Canada was not the employer”).
Nonparty preclusion
Binding someone who was not a party to the first case. Taylor treats this as exceptional and permissible only in defined circumstances.
“Privity”
A historically property-focused concept describing a successor/representative relationship (heir, assignee, executor, etc.). After Taylor, calling something “privity” is not enough; a court must identify which recognized exception actually applies.
Adequate representation
Not merely having similar interests. Under Amos and Taylor, it typically requires procedural protections (like class action safeguards) or a clear understanding that the first party litigated on behalf of the nonparty.
Control of litigation
More than cooperation or shared counsel. The nonparty must effectively direct the case—choosing legal theories, proofs, and controlling the opportunity for appellate review.
Parent vs. subsidiary corporate separateness
Even a wholly owned subsidiary is a separate legal person with its own liabilities; ownership alone does not make the parent and subsidiary the same “party” for preclusion.

V. Conclusion

The Sixth Circuit’s decision establishes a firm doctrinal boundary: nonparty claim preclusion cannot rest on a mere “close-and-significant-relationship” between corporate affiliates. Instead, courts must apply Taylor v. Sturgell and determine whether a specific, recognized exception justifies binding a nonparty. In rejecting relationship-based privity and in rigorously applying the “substantive legal relationship,” “control,” and “adequate representation” exceptions, the court ensures that corporate structure alone does not deprive plaintiffs of a day in court against the correct defendant—while preserving targeted preclusion doctrines (especially issue preclusion) for matters actually decided in the earlier case.