Document ID: s3://data.kl3m.ai/documents/govinfo/USCOURTS/USCOURTS-ca10-16-01012/USCOURTS-ca10-16-01012-0/pdf.json

Parties Involved:
Lenox MacLaren Surgical Corporation
Appellee
Medtronic PS Medical, Inc.
Appellant
Medtronic Sofamor Danek Co., Ltd
Appellant
Medtronic Sofamor Danek, Inc.
Appellant
Medtronic, Inc.
Appellant

Document Text:

PUBLISH 

UNITED STATES COURT OF APPEALS 

FOR THE TENTH CIRCUIT 

_________________________________ 

LENOX MACLAREN SURGICAL 

CORPORATION, 

 Plaintiff – Appellant / 

 Cross-Appellee, 

v. 

MEDTRONIC, INC.; MEDTRONIC 

SOFAMOR DANEK, INC.; MEDTRONIC 

PS MEDICAL, INC., d/b/a Medtronic 

Neurologic Technologies; MEDTRONIC 

SOFAMOR DANEK CO., LTD., 

 Defendants – Appellees / 

 Cross-Appellants. 

Nos. 15-1500 

 and 16-1012 

_________________________________ 

Appeal from the United States District Court 

for the District of Colorado 

(D.C. No. 1:10-CV-02139-MSK-NYW)

_________________________________ 

Derek T. Ho, Kellogg, Huber, Hansen, Todd, Evans & Figel, P.L.L.C., Washington, D.C. 

(G. Stephen Long, Nicole A. Westbrook, Jones & Keller, Denver, Colorado, with him on 

the briefs), for Plaintiff-Appellant/Cross-Appellee. 

Mark C. Fleming, Wilmer Cutler Pickering Hale and Dorr, LLP, Boston, Massachusetts 

(Ari Holtzblatt, Ryan McCarl, Wilmer Cutler Pickering Hale and Dorr, LLP, 

Washington, D.C., and Steven Zager, Akin Gump Strauss Hauer & Feld LLP, New York, 

New York, with him on the briefs), for Defendants-Appellees/Cross-Appellants. 

_________________________________ 

Before LUCERO, HARTZ, and McHUGH, Circuit Judges. 

_________________________________ 

FILED 

United States Court of Appeals 

Tenth Circuit 

February 7, 2017

Elisabeth A. Shumaker 

Clerk of Court

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McHUGH, Circuit Judge. 

_________________________________ 

I. INTRODUCTION 

In 2010, Lenox MacLaren Surgical Corporation (“Lenox”) sued several related 

corporations—Medtronic, Inc.; Medtronic PS Medical, Inc. (“PS Medical”); Medtronic 

Sofamor Danek, Inc. (“MSD, Inc.”); and Medtronic Sofamor Danek Co. Ltd. (“MSD 

Japan”) (collectively, “Defendants”)—for monopolization and attempted monopolization 

in violation of § 2 of the Sherman Act. 15 U.S.C. § 2. Lenox alleged that Defendants 

engaged in illegal activity to advance a coordinated, anticompetitive scheme in which a 

related non-party, Medtronic Sofamor Danek USA, Inc. (“MSD USA”), also participated. 

Lenox had sued MSD USA in 2007 on claims arising from the same set of facts. 

This appeal, the third in this case, challenges the district court’s disposition of 

Defendants’ second motion for summary judgment, which claimed that Lenox could not 

prove the elements of its antitrust claims against any of the named Defendants 

individually, and that Defendants cannot be charged collectively with the conduct of 

MSD USA or of each other. They also argued that the doctrine of claim preclusion bars 

Lenox’s claims, in light of the prior proceeding against MSD USA. The district court 

granted summary judgment, holding that because Lenox could not establish each of the 

elements of an antitrust claim against any one defendant, or establish a conspiracy among 

them, Lenox’s claims fail as a matter of law. 

Lenox now appeals, alleging several errors in the district court’s substantive 

analysis of Lenox’s § 2 claims. Defendants cross-appeal to preserve their argument that, 

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even if the district court erred in resolving Lenox’s antitrust claims, we should affirm on 

the alternative basis of claim preclusion. 

For the reasons set forth below, we conclude that Lenox raised a viable antitrust 

theory, but we decline to address the merits of Lenox’s antitrust claims because to the 

extent Defendants can be held liable under Lenox’s theory of antitrust liability, they are 

in privity with MSD USA. As a result, Lenox’s claims are barred by the claim preclusion 

arm of res judicata. We therefore affirm the district court’s grant of summary judgment 

for Defendants on that basis. 

II. BACKGROUND 

The parties’ dispute traces back to 2000, when Lenox entered into an agreement to 

sell bone mills—surgical tools that Lenox manufactures—through MSD USA. The 

arrangement with MSD USA did not go as Lenox had hoped: MSD USA initiated a recall 

of Lenox’s bone mills, and one of the present defendants, PS Medical, began to 

manufacture and sell its own bone mills to former users of Lenox’s product. As we 

explain in greater detail below, it is this failed arrangement that forms the factual nucleus 

of this case. 

Before proceeding further into the background recitation, we pause to clarify the 

identities of, and relationships among, the several Medtronic entities involved in this 

dispute. In our decisions resolving the two prior appeals in this case, and in Lenox’s 

various filings in the district court, the four named defendants often are referenced as 

one: in Lenox MacLaren Surgical Corp. v. Medtronic, Inc. (Lenox I), 449 F. App’x 704 

(10th Cir. 2011) (unpublished), they are “the Medtronic Defendants”; and in Lenox 

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MacLaren Surgical Corp. v. Medtronic, Inc. (Lenox II), 762 F.3d 1114 (10th Cir. 2014), 

and many of Lenox’s filings, they are “Medtronic.” For purposes of assessing the district 

court’s order and the issues raised in this appeal, however, it is important to keep the 

actions of the various entities separate. 

A. The Medtronic Entities 

Medtronic, Inc. is the highest-tier Medtronic entity named as a defendant in this 

case and is the parent or grandparent corporation of the other three defendants, as well as 

non-party MSD USA, the Medtronic entity Lenox sued in the prior litigation and 

arbitration. PS Medical and MSD, Inc. are wholly owned subsidiaries of Medtronic, Inc.; 

and MSD Japan and MSD USA are wholly owned subsidiaries of MSD, Inc. The relevant 

corporate structure thus looks like this: 

 Medtronic, Inc. (defendant) 

o MSD, Inc. (defendant) 

 MSD Japan (defendant) 

 MSD USA (non-party) 

o PS Medical (defendant) 

B. Factual History1

Lenox was one of the first companies to design and produce a bone mill, which is 

a medical tool that grinds bone into fragments for use in spinal-fusion surgeries. In April 

2000, Lenox entered into a five-year Exclusive Supply and License Agreement (the 

 1

 The underlying facts of this case were presented in detail in Lenox I and Lenox 

II. We reiterate here only the information needed to understand the issues raised in this 

appeal. 

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“license agreement” or the “agreement”) with MSD USA. The agreement granted MSD 

USA the exclusive right to purchase Lenox’s bone mills, rebrand them, and distribute 

them. In exchange, MSD USA promised to “refrain from purchasing [bone mills] from 

any third party or from producing [bone mills] itself,” and agreed to certain minimum 

purchase requirements. Specifically, the agreement required MSD USA to purchase 500 

bone mills in the first year and to purchase 100 bone mills per quarter thereafter to 

maintain the exclusivity of its distribution rights. Among other additional provisions, the 

agreement contained a dispute resolution clause under which the parties agreed to 

arbitrate “any dispute arising out of or relating to” the agreement. 

MSD USA made the initial purchase of 500 bone mills in the first year but did not 

purchase any bone mills after that. Lenox therefore notified MSD USA in 2001 that its 

distribution rights were no longer exclusive. 

MSD USA sold some of the 500 Lenox bone mills but distributed the rest through 

a “loaner program,” whereby doctors and hospitals could use the bone mills for free 

while MSD USA retained ownership of them. Under this program, the bone mills were 

returned to MSD USA after each surgery to be sterilized and redistributed for reuse. 

MSD USA sold or loaned some of the bone mills to MSD Japan, which marketed them to 

doctors and hospitals in Japan. 

In November 2002, after MSD USA had purchased the 500 Lenox bone mills, 

PS Medical began developing a pneumatic bone mill of its own. This device proved 

commercially unsuccessful, and in 2006, PS Medical began developing a new electric 

bone mill called the Midas Rex. 

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Between 2000 and 2006, Lenox and MSD USA received only one complaint about 

Lenox’s bone mill—an April 2003 report from an MSD Japan representative stating that 

a piece of metal was found in the ground bone fragments produced by the device. Lenox 

reviewed the report, determined the malfunction was caused by user error, advised MSD 

USA of its determination, and did not hear anything further about the incident from MSD 

USA. 

Then, on September 4, 2006, an MSD Japan representative generated three new 

complaints. Each complaint was logged on a “Reported Event Form,” and included an 

identical event description: “Metal fragments were mixed with bone fragments (New 

product).” The reported complaints allegedly came from three Japanese surgeons, but 

when Lenox located these surgeons they denied lodging the complaints.2

 The Reported 

Event Form, which appears to be a standard, fill-in-the-blank document, contains the 

following stock instruction: “Please complete all applicable sections and return to MSD 

Global.” There is no Medtronic entity known as MSD Global. 

MSD USA received these complaints and, in October 2006, initiated a recall of 

Lenox’s bone mill. But even before it initiated the recall, in mid-to-late September, MSD 

USA employees began taking steps to replace Lenox’s bone mills loaned to physicians 

with PS Medical’s Midas Rex bone mill. PS Medical started selling the Midas Rex in 

January 2007. It specifically targeted prior users of the Lenox bone mill, using MSD 

 2

 In light of this development, Defendants, which initially had asserted the 

complaints were made to MSD USA by the Japanese surgeons, changed their story and 

claimed instead that the complaints came from MSD Japan representatives and other 

third-party witnesses. 

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USA’s customer list. As we detailed in Lenox II, PS Medical went on to attain a 

monopoly in the market for surgical bone mills. 762 F.3d at 1123–24. 

C. Procedural History 

1. Prior Proceeding Against MSD USA 

Lenox sued MSD USA in 2007, alleging that MSD USA entered into the license 

agreement, engaged in the loaner program, and initiated the recall, all for the purpose of 

creating market demand for a mechanical bone mill, clearing the market of Lenox’s 

competing bone mill, and then filling that market vacuum with the Midas Rex bone mill. 

Specifically, Lenox asserted claims for patent infringement, violation of the Colorado 

Consumer Protection Act, and trade libel. MSD USA moved to compel arbitration under 

the terms of the license agreement. The district court granted the motion, and the lawsuit 

was administratively closed and stayed pending the outcome of the arbitration. 

Once in arbitration, Lenox filed an Amended Arbitration Demand Statement, 

adding, among others, a claim for intentional interference with Lenox’s prospective 

economic relations. After an evidentiary hearing, the arbitral panel rejected most of 

Lenox’s claims, concluding, among other things, that the loaner program and production 

of the Midas Rex bone mill did not breach the license agreement, that MSD USA did not 

breach the covenant of good faith and fair dealing, and that the loaner program did not 

infringe Lenox’s patent. The arbitrators did determine, however, that MSD USA’s recall 

of the bone mills was “intentional and wrongful,” and that MSD USA thereby 

intentionally interfered with Lenox’s prospective business relations. The arbitrators 

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concluded MSD USA was liable to Lenox for $246,000 in damages, plus prejudgment 

interest, and issued an award to that effect. 

MSD USA paid Lenox the damages owed, and the parties thereafter agreed to 

administratively reopen the district court proceeding and to dismiss the case with 

prejudice. 

2. This Case 

In September 2010, Lenox filed the present case against Defendants, alleging 

monopolization and attempted monopolization in violation of § 2 of the Sherman Act, as 

well as state law claims that Lenox later voluntarily dismissed. 

Defendants moved to compel arbitration based on the license agreement between 

Lenox and MSD USA. The district court denied the motion, and a panel of this court 

affirmed. Lenox I, 449 F. App’x at 705. The panel determined that, while the agreement 

between Lenox and MSD USA “is factually significant to [Lenox]’s antitrust claims 

because [it] provided the opportunity for the Medtronic Defendants to engage in the 

anticompetitive conduct alleged,” the agreement “does not form the legal basis for 

[Lenox]’s claims” because “[Lenox’s] claims do not depend on whether either MSD 

USA’s or the Medtronic Defendants’ conduct was proper under the [a]greement.” Id. at 

710. 

Based on limited discovery conducted on remand, Defendants moved for summary 

judgment on both of Lenox’s § 2 claims. The district court granted the motion, 

concluding Lenox could not establish the relevant-market, monopoly-power, or harm-tocompetition aspects of those claims. Lenox MacLaren Surgical Corp. v. Medtronic, Inc., 

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No. 10-cv-02139-RPM-BNB, 2013 WL 3179204, at *3–7 (D. Colo. June 21, 2013).

Lenox appealed, and a separate panel of this court reversed. Lenox II, 762 F.3d at 1116–

17. The panel concluded Lenox’s evidence was sufficient to create a jury question as to 

each element of monopolization and attempted monopolization. See id. at 1119–30. 

Although Defendants argued MSD USA alone was responsible for the recall of Lenox’s 

bone mill, the panel declined to affirm summary judgment on that basis because the 

parties had not yet conducted discovery on Defendants’ involvement. Id. at 1128. The 

panel also declined to consider Defendants’ claim-preclusion3

 argument because, 

although Defendants had raised it in an earlier motion to dismiss, they had not renewed 

the argument in their motion for summary judgment. Id. at 1118. 

After conducting further discovery on remand, the district court granted 

Defendants’ request for leave to file a second motion for summary judgment. As relevant 

here, Defendants argued they were entitled to judgment on both of Lenox’s claims 

because (1) “Lenox cannot prove anticompetitive conduct by any individual Defendant 

and . . . all of the conduct forming the basis of Lenox’s monopoly claims are actions 

taken solely by non-party [MSD] USA”; and (2) Lenox’s claims are barred by the 

doctrine of claim preclusion. Ultimately, the district court agreed with Defendants’ first 

argument and granted summary judgment in their favor on that basis alone. Lenox 

 3

 Although the parties used the term “res judicata” in the Lenox II appeal and use it 

again in this appeal, we employ the more descriptive term “claim preclusion” in this 

opinion. See Migra v. Warren City Sch. Dist. Bd. of Educ., 465 U.S. 75, 77 n.1 (1984); 

Wilkes v. Wyo. Dep’t of Emp’t Div. of Labor Standards, 314 F.3d 501, 504 n.1 (10th Cir. 

2002). 

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appealed, and Defendants cross-appealed to preserve their argument that we can affirm 

on the alternate basis of claim preclusion. 

III. DISCUSSION 

Lenox argues the district court erred in granting summary judgment on its § 2 

monopolization and attempted monopolization claims. See 15 U.S.C. § 2. Specifically, 

Lenox asserts the court failed to analyze these claims under the proper legal theory and 

that, viewed through the lens of this theory, the record evidence is sufficient to 

establish—or create triable issues of fact as to the existence of—all the elements of each 

claim. We review de novo the district court’s grant of summary judgment, Savant Homes, 

Inc. v. Collins, 809 F.3d 1133, 1137 (10th Cir. 2016), and its determination of the 

applicable legal standard, see Conroy v. Vilsack, 707 F.3d 1163, 1168 (10th Cir. 2013). 

Defendants argue on cross-appeal that even if the district court erred in disposing 

of Lenox’s antitrust claims on the merits (which Defendants do not concede), we 

nonetheless should affirm the grant of summary judgment on the alternative basis that 

Lenox’s claims are barred by the doctrine of claim preclusion. Where, as here, claim 

preclusion was adequately raised below, we may consider it as an alternative basis for 

affirmance even if the district court did not base its decision on that doctrine. MACTEC, 

Inc. v. Gorelick, 427 F.3d 821, 831 (10th Cir. 2005). If the relevant facts are undisputed, 

the application of preclusion principles to those facts is a question of law that we consider 

de novo. See Pelt v. Utah, 539 F.3d 1271, 1280–81 (10th Cir. 2008); King v. Union Oil 

Co. of Cal., 117 F.3d 443, 445 (10th Cir. 1997). 

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We begin with Lenox’s substantive antitrust claims. To properly assess whether, 

as Lenox contends, the district court erred in disposing of these claims, we must first 

consider Lenox’s assertions that it set forth at summary judgment a legal approach other 

than those considered in the district court’s order and that this alternative approach is 

legitimate. For the reasons set forth below, we conclude that Lenox advanced a viable, if 

somewhat unusual, antitrust theory. But we affirm the district court’s grant of summary 

judgment because even if we were to conclude Lenox’s substantive theory of the case is 

correct on the merits, it necessarily follows that Defendants and MSD USA are in privity 

and that Lenox’s claims are precluded. 

A. Lenox’s Sherman Act Claims 

Lenox argues the district court erred by construing its claims of monopolization 

and attempted monopolization as a claim of conspiracy to monopolize, which requires 

proof of an agreement among the co-conspirators. See Full Draw Prods. v. Easton Sports, 

Inc., 182 F.3d 745, 756 (10th Cir. 1999) (discussing the elements of each claim). Lenox 

maintains instead that Defendants are a “single enterprise” for purposes of antitrust 

analysis. As a result, Lenox claims it was entitled to pursue non-conspiracy § 2 claims 

based on Defendants’ aggregate conduct and was not required to prove the existence of 

an agreement among them. According to Lenox, its burden of establishing any individual 

defendant’s liability required showing only that the defendant’s conduct played a “role” 

in the overall anticompetitive scheme perpetrated by the enterprise as a whole. 

For their part, Defendants acknowledge that the district court considered a 

conspiracy rationale but contend it did so as an alternative theory of liability, in addition 

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to considering actual- and attempted-monopolization theories. Defendants argue any error 

on the part of the district court in addressing conspiracy is immaterial because the court 

also determined—correctly, in Defendants’ view—that Lenox cannot prove any one 

defendant engaged in anticompetitive conduct and therefore cannot establish § 2 liability 

under any theory. 

It is unnecessary to resolve the parties’ dispute over the precise nature and scope 

of the district court’s analysis. Regardless of whether the district court considered only a 

conspiracy rationale, or also assessed each defendant’s conduct individually under the 

alternative tests Defendants deem appropriate, Lenox fairly presented a single-enterprise 

theory of antitrust liability, which the district court did not consider. But that oversight is 

understandable in light of the novelty of the theory as well as Lenox’s confusing attempt 

to toe the line between proving antitrust liability, while avoiding preclusion. As an issue 

of first impression for this court, we conclude that Lenox’s single-enterprise theory is 

viable as a general matter. But the success of the theory here relies on an identity of 

purpose among Defendants and MSD USA that bars Lenox’s action under the doctrine of 

claim preclusion. To explain our reasoning, we begin with a discussion of singleenterprise monopolization and then address the impact of that analysis on the application 

of claim-preclusion principles to the facts of this case. 

1. Unilateral and Concerted Action Under the Sherman Act 

At the root of the substantive issues implicated here is the Sherman Act’s oftemphasized distinction between independent and concerted conduct. See Am. Needle, Inc. 

v. Nat’l Football League, 560 U.S. 183, 189–91 (2010); Cohlmia v. St. John Med. Ctr., 

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693 F.3d 1269, 1280 (10th Cir. 2012). Section 1 of the Sherman Act—which prohibits 

“[e]very contract, combination . . . or conspiracy, in restraint of trade or commerce,” 15 

U.S.C. § 1—“applies only to concerted action that restrains trade.” Am. Needle, 560 U.S. 

at 190. By contrast, § 2 of the Sherman Act—which makes it illegal to “monopolize, or 

attempt to monopolize, or combine or conspire . . . to monopolize any part of the trade or 

commerce,” 15 U.S.C. § 2—“covers both concerted and independent action, but only if 

that action ‘monopolizes’ . . . or ‘threatens actual monopolization,’” Am. Needle, 560 

U.S. at 190 (alteration and citations omitted), or at least is intended to monopolize, see 

Auraria Student Housing at the Regency, LLC v. Campus Vill. Apartments, LLC, 843 

F.3d 1225, 1233 (10th Cir. 2016). See also Multistate Legal Studies, Inc. v. Harcourt 

Brace Jovanovich Legal & Prof’l Publ’ns, Inc., 63 F.3d 1540, 1545 (10th Cir. 1995) 

(“Section 1 of the Act focuses on the anticompetitive behavior of joint actors . . . [while] 

[s]ection 2 applies to unilateral as well as joint action . . . .” (citation omitted)). 

Thus, like § 1, § 2 embodies a conspiracy claim that requires “concerted action by 

a plurality of actors.” See Bell v. Fur Breeders Agric. Coop., 348 F.3d 1224, 1232 (10th 

Cir. 2003) (section 1); Lantec, Inc. v. Novell, Inc., 306 F.3d 1003, 1028 (10th Cir. 2002) 

(section 2). The elements of a § 2 conspiracy claim are “conspiracy, specific intent to 

monopolize, and overt acts done in furtherance of the conspiracy.” Full Draw Prods., 182 

F.3d at 756 (citation omitted). Unlike § 1, however, § 2—through its prohibitions on 

monopolization and attempted monopolization—also “can be violated by a single 

economic unit without requiring any contract, combination, or conspiracy.” Cohlmia, 693 

F.3d at 1280. The elements of a § 2 monopolization claim are “(1) monopoly power in 

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the relevant market; (2) willful acquisition or maintenance of this power through 

exclusionary conduct; and (3) harm to competition.” Lenox II, 762 F.3d at 1119. And the 

elements of a § 2 attempted monopolization claim are (1) “predatory or anticompetitive 

conduct,” (2) “a specific intent to monopolize,” and (3) “a dangerous probability of 

achieving monopoly power.” Id. at 1129. 

These basic principles illuminate the dispute in this case. Lenox claimed that 

Defendants attempted to monopolize, and succeeded in monopolizing, the bone-mill 

market in violation of § 2. Seeing Defendants as four separate companies and noting 

MSD USA’s critical involvement in the conduct undergirding Lenox’s claims, however, 

the district court concluded that Lenox could not establish § 2 monopolization or 

attempted-monopolization liability as to any individual defendant, because no single 

defendant’s conduct satisfied all the respective elements of those claims. The district 

court then concluded Lenox had two other options: (1) it could succeed on its actual- and 

attempted-monopolization claims by proving either that Defendants controlled MSD 

USA’s conduct or shared an “alter ego” relationship with MSD USA; or (2) it could 

instead succeed on a conspiracy-to-monopolize theory if it could prove Defendants 

conspired, among themselves and with MSD USA, to monopolize the bone-mill market. 

Although the district court’s reasoning is understandable, we conclude that Lenox 

actually raised a separate, single-enterprise theory, which has rarely been presented in 

federal antitrust litigation and has never been acknowledged by this court. In light of 

certain longstanding, if nuanced, legal principles regarding the concept of concerted 

action under the Sherman Act, as well as the obverse corollaries of those principles, we 

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now recognize the viability of such a theory in the abstract. We ultimately affirm on 

claim-preclusion grounds the district court’s rejection of Lenox’s claims, but we explain 

the antitrust concepts that sustain Lenox’s single-enterprise theory to place our 

subsequent preclusion discussion in context. 

2. Copperweld and its Corresponding Principles

Our starting point is the Supreme Court’s decision in Copperweld Corp. v. 

Independence Tube Corp., which involved a plaintiff manufacturer’s claim that its 

competitor and the competitor’s parent corporation had conspired in violation of § 1 of 

the Sherman Act. 467 U.S. 752, 756–58 (1984). A jury found the parent and subsidiary 

defendants liable under § 1, and the Seventh Circuit affirmed under the so-called “intraenterprise conspiracy” doctrine, which permitted § 1 liability for the coordinated acts of a 

parent and its wholly owned subsidiary “when there is enough separation between the 

two entities to make treating them as two independent actors sensible.” Id. at 758–59 

(internal quotation marks omitted). The Supreme Court granted certiorari and reversed, 

abrogating the intra-enterprise conspiracy doctrine in the process. 

The Court reiterated the Sherman Act’s basic distinction between unilateral and 

concerted conduct, and explained how the rationale underlying that distinction logically 

supported the then-already-accepted notions that coordinated activity among a 

corporation’s employees or among a corporation and its unincorporated divisions does 

not violate § 1. Id. at 767–71. The Court then concluded that, for the same reasons, the 

coordinated acts of a corporation and its wholly owned subsidiary also do not violate § 1. 

Id. at 771–74. Among other things, the Court stressed that 

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[a] parent and its wholly owned subsidiary have a complete unity of 

interest. Their objectives are common, not disparate; their general corporate 

actions are guided and determined not by two separate corporate 

consciousnesses, but one. . . . If a parent and a wholly owned subsidiary do 

“agree” to a course of action, there is no sudden joining of economic 

resources that had previously served different interests, and there is no 

justification for § 1 scrutiny. 

 Indeed, the very notion of an “agreement” in Sherman Act terms 

between a parent and its wholly owned subsidiary lacks meaning. A § 1 

agreement may be found when “the conspirators had a unity of purpose or a 

common design and understanding, or a meeting of the minds in an 

unlawful arrangement.” [Am. Tobacco Co. v. United States, 328 U.S. 781, 

810 (1946).] But in reality a parent and a wholly owned subsidiary always 

have a “unity of purpose or a common design.” 

Id. at 771. For these reasons, the Court held that “the coordinated activity of a parent and 

its wholly owned subsidiary must be viewed as that of a single enterprise,” id.; see also 

id. at 772 n.18 (“[T]he parent and the subsidiary must be viewed as a single economic 

unit.”), such that the parent and subsidiary are legally incapable of conspiring in violation 

of § 1, id. at 777. The Court noted, however, that its holding would not immunize 

corporations and their wholly owned subsidiaries from antitrust liability because “the 

enterprise [remains] fully subject to § 2 of the Sherman Act.” See id.

Although Copperweld addressed the specific relationship between a parent 

company and its wholly owned subsidiary, “[l]ower courts have since applied 

Copperweld’s reasoning (sometimes referred to as the ‘single-entity’ rule) to a broader 

variety of economic relationships.” Jack Russell Terrier Network of N. Cal. v. Am. 

Kennel Club, Inc., 407 F.3d 1027, 1034 (9th Cir. 2005); see also City of Mt. Pleasant v. 

Associated Elec. Coop., Inc., 838 F.2d 268, 274 (8th Cir. 1988) (“[T]he logic of 

Copperweld reaches beyond its bare result . . . .”). As relevant here, the majority of our 

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sister circuits (indeed, every circuit to address the question), as well as our colleagues on 

the district courts of this circuit, have held that Copperweld’s “rationale and underlying 

policy apply with equal force to sister corporations that are wholly owned subsidiaries of 

the same parent,” and that such subsidiaries, along with their parent, constitute a single 

economic enterprise for antitrust purposes.4 Gonzalez-Maldonado v. MMM Healthcare, 

Inc., 693 F.3d 244, 249–50 (1st Cir. 2012); accord, e.g., Total Benefits Planning Agency, 

Inc. v. Anthem Blue Cross & Blue Shield, 552 F.3d 430, 435 (6th Cir. 2008); Freeman v. 

San Diego Ass’n of Realtors, 322 F.3d 1133, 1147 (9th Cir. 2003); Davidson & Schaaff, 

Inc. v. Liberty Nat’l Fire Ins. Co., 69 F.3d 868, 871 (8th Cir. 1995) (citing Copperweld

for the proposition that “two subsidiaries of the same parent cannot conspire,” but 

applying it in the context of a civil conspiracy claim); Siegel Transfer, Inc. v. Carrier 

Express, Inc., 54 F.3d 1125, 1133–34 (3d Cir. 1995); Advanced Health-Care Servs., Inc. 

v. Radford Cmty. Hosp., 910 F.2d 139, 146 (4th Cir. 1990); Hood v. Tenneco Tex. Life 

Ins. Co., 739 F.2d 1012, 1015 (5th Cir. 1984); Hear-Wear Techs., LLC v. Oticon, Inc., 

No. 07-CV-0212-CVE-SAJ, 2007 WL 4379714, at *4–5 (N.D. Okla. Dec. 12, 2007); 

Med. Supply Chain, Inc. v. US Bancorp, NA, No. 02-2539-CM, 2003 WL 21479192, at 

 4

 “Simply stated, federal courts have consistently applied Copperweld to preclude 

the finding of antitrust conspiracies within a corporate family . . . .” Horst v. Laidlaw 

Waste Sys., Inc., 917 F. Supp. 739, 742 (D. Colo. 1996); see also 7 Phillip E. Areeda & 

Herbert Hovenkamp, Antitrust Law ¶ 1464f, at 225 & n.33 (3d ed. 2008) (stating that 

“[t]he post-Copperweld decisions are virtually unani[m]ous” on this point); 1 A.B.A. 

Section of Antitrust Law, Antitrust Law Developments 27 (5th ed. 2002) [hereinafter 

Antitrust Developments] (“Most courts have held that the Copperweld rule extends to 

conspiracies between sister corporations.”). 

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*3 (D. Kan. June 16, 2003); H.R.M., Inc. v. Tele-Commc’ns, Inc., 653 F. Supp. 645, 647–

48 (D. Colo. 1987). 

While we have not yet expressly addressed Copperweld’s application in the sistersubsidiary context, our precedent does not point to a contrary result. Indeed, we have 

endorsed this extension of Copperweld implicitly. In Medical Supply Chain, Inc. v. US 

Bancorp, NA, 112 F. App’x 730 (10th Cir. 2004) (unpublished), a panel of this court 

reviewed a district court order dismissing a plaintiff’s § 1 and § 2 conspiracy claims on 

the ground that, under Copperweld, the defendants—a parent and several of its wholly 

owned subsidiaries—were a single enterprise incapable of conspiring. Med. Supply 

Chain, 2003 WL 21479192, at *3, *5. Although the panel did not itself explicate the 

result, it “conclude[d] that the district court correctly decided th[e] case” and, reviewing 

the district court’s decision de novo, affirmed “for the same reasons stated by the district 

court.” Med. Supply Chain, 112 F. App’x at 731. 

The only other case in which we have touched on the single-enterprise theory is 

Mitchael v. Intracorp, Inc., 179 F.3d 847 (10th Cir. 1999). There, we rejected the 

plaintiffs’ attempt “to extend Copperweld to hold that a subsidiary and its parent, or a 

subsidiary and a sister subsidiary, can be considered one entity for all § 1 purposes, and 

either one can be liable for conspiring to restrain trade, even where there is no evidence 

that both were involved in the challenged conduct.” Id. at 857 (emphasis added). We 

reasoned this extension was unwarranted because “the [Copperweld] Court held only that 

‘the coordinated activity’ of a parent and subsidiary must be viewed as that of a single 

enterprise for § 1 purposes.” Id. (quoting Copperweld, 467 U.S. at 771 (emphasis 

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added)). Because in Intracorp there was “no evidence of any involvement by [the 

defendant’s] parent or sister corporations,” we concluded that Copperweld’s single-entity 

rule was inapplicable. Id. at 857 n.12 (citation omitted). But we did not address (much 

less reject) the notion that, with evidence of involvement, sister corporations and their 

parent should be treated as a single entity for antitrust purposes. 

Thus, nothing in our existing precedent would prevent Lenox from pursuing a 

theory consistent with the majority view that Copperweld supports treating the 

coordinated acts of sister subsidiaries wholly owned by the same parent as those of a 

single enterprise, such that the subsidiaries are incapable of conspiring under § 1 of the 

Sherman Act. Courts and commentators have long agreed that the logic of this view is 

plain. See, e.g., Advanced Health-Care Servs., 910 F.2d at 145–47 (explaining rationale; 

collecting early cases); Stephen Calkins, Copperweld in the Courts: The Road to Caribe, 

63 Antitrust L.J. 345, 351 (1995) (characterizing the notion that “sister corporations are 

incapable of conspiring in violation of the Sherman Act” after Copperweld as an 

“obvious conclusion, which courts quickly grasped”); see generally Phillip Areeda, 

Intraenterprise Conspiracy in Decline, 97 Harv. L. Rev. 451 (1983). In the words of the 

preeminent antitrust treatise: 

[A]ll of the reasoning of the Court [in Copperweld] . . . equates sibling 

corporations with subsidiaries. The total unity of the corporate enterprise is 

equally reflected in both. In refusing to make corporate form determinative 

and in refusing to treat wholly owned corporations differently from 

unincorporated divisions, the Copperweld holding also denies 

conspiratorial capacity to sibling corporations’ dealings with each other. 

7 Areeda & Hovenkamp, supra, ¶ 1464f, at 225. We agree. 

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In addition, we also conclude that Copperweld’s reasoning with respect to § 1 

applies equally to § 2—for the same reasons single-enterprise entities cannot conspire in 

violation of the former provision, they cannot conspire in violation of the latter. Although 

neither the Supreme Court nor this circuit has expressly extended Copperweld’s holding 

to § 2, the rationale for doing so is obvious. A § 2 conspiracy claim, like a § 1 claim, 

requires concerted activity between at least two participants. See Lantec, 306 F.3d at 

1028. It would be anomalous to hold that wholly related corporations constitute a single 

entity, and so cannot form a conspiracy, for purposes of § 1, but that the same 

corporations constitute separate entities, and so can form a conspiracy, for purposes of 

§ 2. Not surprisingly, every court to address the question has held that affiliated entities 

which must be treated as a single enterprise for purposes of § 1 also must be treated as a 

single enterprise for purposes of § 2.5 See, e.g., Vollrath Co. v. Sammi Corp., 9 F.3d 

1455, 1459, 1463 (9th Cir. 1993); Advanced Health-Care Servs., 910 F.2d at 150; Potters 

Med. Ctr. v. City Hosp. Ass’n, 800 F.2d 568, 573–74 (6th Cir. 1986); Ritz Camera & 

Image, LLC v. SanDisk Corp., 772 F. Supp. 2d 1100, 1110–11 (N.D. Cal. 2011); D’Last 

Corp. v. Ugent, 863 F. Supp. 763, 769 (N.D. Ill. 1994); H.R.M., Inc., 653 F. Supp. at 648. 

Commentators, too, concur. See, e.g., 7 Areeda & Hovenkamp, supra, ¶ 1464g, at 227 

(“Affiliated corporations that constitute a single entity so as to be incapable of conspiring 

 5

 The district court here cited Growers 1-7 v. Ocean Spray Cranberries, Inc., No. 

12-12016-RWZ, 2014 WL 1764533 (D. Mass. May 2, 2014), as having “reject[ed] [the] 

argument that [the] First Circuit has extended Copperweld to monopoly cases.” To be 

sure, the Growers court rejected a party’s characterization of a prior First Circuit case as 

having extended Copperweld to § 2 claims and clarified that the cited case did not 

address the issue. Id. at *7 n.11. But the Growers court then decided for itself that 

Copperweld’s reasoning does apply in the context of § 2. Id. at *7. 

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for purposes of Sherman Act § 1 are equally incapable of conspiring to monopolize under 

Sherman Act § 2.”); Antitrust Developments, supra, at 310 (“Copperweld’s holding . . . 

applies to conspiracies to monopolize.” (footnote omitted)). Moreover, in the same case 

in which a panel of this court implicitly approved extending Copperweld to sister 

subsidiaries, the panel also implicitly approved extending it to § 2 conspiracy claims. See 

Med. Supply Chain, 2003 WL 21479192, at *5 (dismissing § 2 conspiracy claim for same 

reasons it dismissed § 1 claim), aff’d 112 F. App’x at 731 (affirming “for the same 

reasons stated by the district court”). 

Applied to the case at hand, the foregoing discussion leads naturally to several 

related conclusions. For one, we agree with Lenox that Defendants—three of which 

(MSD Japan, PS Medical, and MSD, Inc.) are wholly owned subsidiaries of the fourth 

(Medtronic, Inc.)—should be treated as a single enterprise for purposes of the Sherman 

Act’s conspiracy prohibitions.6 See, e.g., Freeman, 322 F.3d at 1148 (“Where there is 

substantial common ownership, . . . individual firms function as an economic unit and are 

generally treated as a single entity.”). Thus, Lenox could not have pursued a conspiracy 

claim against Defendants. It also follows that Lenox was permitted under the antitrust 

laws to assert § 2 monopolization and attempted monopolization claims—while a single 

corporate enterprise is unable to engage in the concerted action necessary for conspiracy 

liability, its unitary action remains “fully subject to § 2 of the Sherman Act.” See 

 6

 Although MSD Japan is actually a wholly owned subsidiary of MSD, Inc., and 

thus a sub-subsidiary or “grandchild” of Medtronic, Inc., Defendants have not argued that 

this distinction should affect our analysis. Cf. Horst, 917 F. Supp. at 742 (“[W]hether 

Defendants are sister corporations or one is the wholly owned ‘grandchild’ of the other, 

they are [a single entity] incapable of conspiring under the Sherman Act.”). 

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Copperweld, 467 U.S. at 777; see also, e.g., Gonzalez-Maldonado, 693 F.3d at 250 (“Of 

course, a [single enterprise] can violate section 2 of the Sherman Act, which prohibits 

attempts to monopolize and monopolization[.]”); Advanced Health-Care Servs., 910 F.2d 

at 146–50 (affirming dismissal of plaintiff’s § 1 and § 2 conspiracy claims against sistercorporation defendants under Copperweld, but reversing dismissal of monopolization and 

attempted monopolization claims against same defendants); Climax Molybdenum Co. v. 

Molychem, L.L.C., 414 F. Supp. 2d 1007, 1012–13 (D. Colo. 2005) (rejecting parent and 

subsidiary defendants’ argument that plaintiff’s § 2 monopolization and attempted 

monopolization claims were really a § 2 conspiracy claim barred by Copperweld, and 

holding plaintiff could proceed with its claims). 

Similarly, and although Copperweld did not expressly reach this issue, we 

conclude Copperweld’s reasoning necessarily denounces Defendants’ belief that Lenox 

could directly establish its non-conspiracy § 2 claims only by proving that “specific 

Defendants” independently satisfied each necessary element of the claims. (Emphasis 

added.) Rather, in a single-enterprise situation, it is the affiliated corporations’ collective 

conduct—i.e., the conduct of the enterprise they jointly compose—that matters; it is the 

enterprise which must be shown to satisfy the elements of a monopolization or attempted 

monopolization claim. Cf. 7 Areeda & Hovenkamp, supra, ¶ 1464g, at 227 (“[A] single 

entity can violate § 2 if the prerequisites for monopolization or attempted monopolization 

are met[.]”). Stated another way, the related entities’ coordinated conduct must be treated 

as the unitary conduct of the single enterprise which together they form, and it is that 

aggregated conduct which must be scrutinized under § 2. 

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To hold otherwise—to require that each affiliated defendant independently satisfy 

every element in order to be held liable—would be difficult to justify in light of the 

Supreme Court’s direction that the “anticompetitive activities of corporations and their 

wholly owned subsidiaries meriting antitrust remedies may be policed adequately without 

resort to an intra-enterprise conspiracy doctrine,” in part because the enterprise they form 

“is fully subject to § 2 of the Sherman Act.” Copperweld, 467 U.S. at 776–77. And it 

would all but eviscerate the statute with respect to sophisticated competitors. So long as a 

corporation spread its anticompetitive scheme over multiple subsidiaries, such that no one 

entity met all the requirements for individual antitrust liability, it could unlawfully 

monopolize with impunity. We think Copperweld forecloses this result. 

Although we have found no decision that elucidates this corollary of 

Copperweld’s reasoning, numerous courts have followed it in practice. See, e.g., Vollrath, 

9 F.3d at 1460–62 (concluding affiliated defendants were single entity incapable of 

conspiring for purposes of § 1 and § 2 conspiracy claims; analyzing them as “an 

integrated entity” for purposes of attempted monopolization claim); City of Mt. Pleasant, 

838 F.2d at 279–80 (concluding members of cooperative were single entity incapable of 

conspiring; analyzing whether cooperative itself satisfied elements of monopolization 

claims); Directory Sales Mgmt. Corp. v. Ohio Bell Tel. Co., 833 F.2d 606, 611–14 (6th 

Cir. 1987) (similar); Horst, 917 F. Supp. at 742–45 (similar). Indeed, the same can be 

said of our decision in Lenox II, where we determined a jury could find that the overall 

course of conduct at issue in this litigation violated § 2 even though we left unanswered 

the question of each defendant’s specific role in that conduct. See 762 F.3d at 1117, 

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1119–29. Thus, while we agree with Defendants that none of them individually satisfied 

the elements of a monopolization or attempted monopolization claim, we do not agree 

that the inquiry into their liability ends there. 

3. The Requirement of Coordinated Activity 

But nothing in our prior discussion should be read to suggest that a corporation 

can be held liable under § 2 for the anticompetitive conduct of one or more related 

entities, merely by virtue of its place in the same corporate family. As this court has 

previously indicated, Copperweld “held only that ‘the coordinated activity’ of [related 

entities] must be viewed as that of a single enterprise.” See Intracorp, 179 F.3d at 857 

(quoting Copperweld, 467 U.S. at 771 (emphasis added)). Thus, an affiliated corporation 

cannot be held liable as a part of the enterprise “where there is no evidence that [the 

corporation] w[as] involved in the challenged conduct.” See id. So although we agree that 

Lenox was entitled to pursue its § 2 claims against Defendants as a single enterprise, and 

to prove those claims based on the actions of the enterprise as a whole, Lenox was still 

required to come forward with evidence that each defendant independently participated in 

the enterprise’s scheme, to justify holding that defendant liable as part of the enterprise. 

But neither this circuit nor any other has provided a clear answer to the question of what 

level of involvement is sufficient to meet that burden. And here, the parties’ briefs and 

the district court’s order offer different options for formulating that test. 

To begin, the district court noted that, irrespective of its own conduct, an affiliated 

corporation could be deemed automatically or vicariously liable for the conduct of one or 

more related corporations under a veil-piercing, alter ego, or respondeat superior theory. 

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We agree with this general proposition. Cf. id. at 857 n.12 (noting that, aside from the 

lack of evidence of the parent’s and sister corporations’ involvement in the defendant’s 

conduct, there also was “no evidence that [the defendant] [wa]s merely the alter ego of its 

parent or sister corporations” (citation omitted)). But these theories operate independently 

of the single-enterprise theory. Rather than render the affiliated corporation a part of an 

anticompetitive enterprise, a veil-piercing, alter ego, or respondeat superior theory would 

hold the affiliated corporation separately and individually liable for its related 

corporations’ conduct. And here, Lenox disclaimed reliance on any of these theories, 

instead insisting that its focus is on each affiliated corporation’s individual contribution to 

the enterprise’s monopolistic scheme. 

As authority for alternative approaches to this question, both Lenox and 

Defendants point to a pair of district court cases—Molychem, 414 F. Supp. 2d at 1012–

13, and Nobody In Particular Presents, Inc. v. Clear Channel Communications, Inc., 311 

F. Supp. 2d 1048, 1068–71 (D. Colo. 2004)—that considered the question of when a 

parent corporation can be held liable for anticompetitive conduct occurring in the market 

in which its subsidiary competes. The district court in each case determined that a parent 

can be liable for subsidiary-level anticompetitive activity “if there are factual allegations . 

. . showing independent conduct on the part of the parent.” Molychem, 414 F. Supp. 2d at 

1012 (citing Nobody In Particular, 311 F. Supp. 2d at 1068–69); see also Nobody In 

Particular, 311 F. Supp. 2d at 1070 (“[L]ower courts have recognized that parent 

corporations can be held directly liable for independently participating in the antitrust 

violations of their subsidiaries.”). And in each case, the court concluded that, “‘[w]hen 

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the parent controls, dictates or encourages the subsidiary’s anticompetitive conduct, the 

parent engages in sufficient independent conduct to be held directly liable as a single 

enterprise with the subsidiary under the Sherman Act.’” Molychem, 414 F. Supp. 2d at 

1012 (quoting Nobody In Particular, 311 F. Supp. 2d at 1071). 

While both sides highlight these same general passages, they interpret them 

differently. Defendants seize on the “control, dictate, or encourage” language and assert 

that Lenox cannot satisfy this standard here. Specifically, Defendants argue that absent 

proof each of them individually satisfied the elements of a § 2 claim or shared an alterego relationship with MSD USA, the only way they can be held liable is if they 

controlled, dictated, or encouraged MSD USA’s anticompetitive activity.7

 Lenox, on the 

other hand, argues that the “control/dictate/encourage” test is merely one way that 

sufficient independent conduct can be established and that these district court cases stand 

for the broader proposition that an affiliated entity must have done something 

independently to aid or contribute to the enterprise’s overall anticompetitive scheme. 

 7

 In addition to the above-referenced district court cases, Defendants rely on the 

Eighth Circuit’s decision in H.J., Inc. v. International Telephone & Telegraph Corp. for 

the same basic propositions. See 867 F.2d 1531, 1549 (8th Cir. 1989) (“[The parent] 

cannot be held liable ‘as an actor’ without proof that it performed acts sufficient to create 

liability, or actively influenced [the subsidiary] in its violations. . . . Nor can [the parent] 

be held liable as the sole shareholder of [the subsidiary], since [the plaintiff] offered no 

evidence to show that [the subsidiary] was a mere instrumentality or alter ego of [the 

parent], or that [the subsidiary] is a sham corporation formed to shield [the parent] from 

liability.”). But the H.J., Inc. court never considered whether the parent and subsidiary 

defendants there could be considered a single enterprise under Copperweld, even for 

purposes of the plaintiff’s § 1 claim. See id. at 1543–45 (overturning jury’s finding of 

Sherman Act § 1 violation based on inadequacy of evidence showing parent and 

subsidiary conspired, without considering whether parent and subsidiary were incapable 

of conspiring for purposes of § 1). 

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This, according to Lenox, aligns with its view of the proper legal test,8

 which is that each 

defendant must have played a “role”—or “participated”—in the anticompetitive conduct 

of the enterprise as a whole.9

 Lenox asserts that, under this standard, the evidence it 

presented is more than sufficient to support a jury finding that each defendant played a 

role in the enterprise’s overall scheme and therefore that each defendant is liable under 

§ 2. 

The question of what must be shown in order to hold a particular affiliated 

corporation liable as part of an inter-corporate scheme appears to be uncharted territory at 

the federal circuit level. And although the parties here have argued admirably for their 

respective positions on this question, we leave its resolution for another day. We 

 8

 In one footnote of its opening brief and twice in its reply brief, Lenox appears to 

express a different view of the legal theory applicable to its antitrust claims. In these 

instances, Lenox essentially contends that each defendant’s liability under § 2 must be 

assessed individually, albeit under a modified conspiracy framework. This vacillation 

likely reflects Lenox’s awareness that it is walking a fine line doctrinally in this case 

between establishing enterprise liability and avoiding privity with MSD USA for 

purposes of claim preclusion, which we address in Part III.B.1 below. Because Lenox has 

not adequately briefed this potential alternative legal theory, we reject it in favor of the 

principles outlined in this opinion. 

9

 Lenox contends this “role” test was espoused by this court in Lenox II, such that, 

aside from being proper as an objective legal matter, it also constitutes the law of the 

case. See Entek GRB, LLC v. Stull Ranches, LLC, 840 F.3d 1239, 1241 (10th Cir. 2016) 

(when invoked, “[l]aw of the case doctrine . . . preclud[es] the relitigation of issues either 

expressly or implicitly resolved in prior proceedings in the same court”). We reject this 

reading of Lenox II. In the relevant portion of that decision, we briefly addressed 

Defendants’ implicit contention that MSD USA was solely responsible for the sham 

recall of Lenox’s bone mill, observing that Defendants “appear[] to assume . . . [they] had 

no role in the recall.” Lenox II, 762 F.3d at 1128. But since the district court had not yet 

permitted discovery on Defendants’ involvement, we concluded Defendants could not 

“salvage the summary judgment ruling based on [their] assumption that none of [them] 

played a role in the recall.” Id. Viewed in context, it is apparent that we used the word 

“role” as a generic descriptor and that we were not announcing any substantive legal test 

of enterprise liability. Lenox II established neither law nor law of the case on this issue. 

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therefore express no opinion on the parties’ proffered tests or the evidence of each 

defendant’s individual conduct; nor do we decide whether each defendant can be held 

liable for the enterprise’s alleged violations of § 2 under the present facts. We need not 

address these issues here because even if we resolved them all in Lenox’s favor, the 

outcome of this case would be the same. 

As explained, Lenox seeks to hold Defendants liable under § 2 on the theory that 

they are part of a single corporate enterprise that monopolized or attempted to 

monopolize the bone-mill market. And while Lenox did not join MSD USA as a party, its 

theory requires that MSD USA be recognized as a member of the enterprise. Indeed, the 

anticompetitive scheme Lenox has alleged was dependent upon the actions of MSD USA. 

Accordingly, even if we agreed with Lenox that each of the four defendants played a 

sufficient “role” in the Medtronic enterprise’s overall scheme by engaging in conduct 

coordinated with but separate from MSD USA’s conduct, such that Defendants all could 

be deemed a part of the enterprise, MSD USA would necessarily be a part of the 

enterprise along with them. As we now explain, it is this inescapable fact—that Lenox’s 

ability to succeed on its antitrust claims hinges on treating one or more Defendants and 

MSD USA as a single entity—that leads to the conclusion that Lenox’s antitrust claims 

are barred under the doctrine of claim preclusion. 

B. Claim Preclusion 

“The doctrine of res judicata, or claim preclusion, will prevent a party from 

litigating a legal claim that was or could have been the subject of a previously issued final 

judgment.” MACTEC, Inc. v. Gorelick, 427 F.3d 821, 831 (10th Cir. 2005). “The 

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principle underlying the rule of claim preclusion is that a party who once has had a 

chance to litigate a claim before an appropriate tribunal usually ought not have another 

chance to do so.” Stone v. Dep’t of Aviation, 453 F.3d 1271, 1275 (10th Cir. 2006) 

(citation omitted). To apply claim preclusion, “three elements must exist: (1) a [final] 

judgment on the merits in an earlier action; (2) identity of parties or privies in the two 

suits; and (3) identity of the cause of action in both suits.” King v. Union Oil Co. of Cal., 

117 F.3d 443, 445 (10th Cir. 1997). In addition, even if these three elements are satisfied, 

there is an exception to the application of claim preclusion where the party resisting it did 

not have a “full and fair opportunity to litigate” the claim in the prior action. MACTEC, 

427 F.3d at 831 & n.6. 

Lenox does not dispute Defendants’ assertion that the first and third elements are 

satisfied here, and neither do we. The arbitration award, followed by a voluntary 

dismissal with prejudice of the prior federal litigation, was a final judgment on the merits. 

See id. at 831 (“[A] valid and final award by arbitration generally has the same effect 

under the rules of res judicata as a judgment of a court.”); see also Brooks v. Barbour 

Energy Corp., 804 F.2d 1144, 1146 (10th Cir. 1986) (holding voluntary dismissal with 

prejudice after settlement was final judgment on merits). And there is “identity of the 

cause of action in both suits” because Lenox’s claims here and in the prior proceeding 

arise from the same underlying events. See Nwosun v. Gen. Mills Rests., Inc., 124 F.3d 

1255, 1257 (10th Cir. 1997) (“This circuit embraces the transactional approach to the 

definition of ‘cause of action.’ Under this approach, a cause of action includes all claims 

or legal theories of recovery that arise from the same transaction, event, or occurrence.” 

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(footnote and citation omitted)); Plotner v. AT&T Corp., 224 F.3d 1161, 1170 (10th Cir. 

2000) (“The fact that [plaintiff] now presents some of her claims under the rubric of 

slightly different legal theories . . . does not obscure the fact that they all arise out of a 

single transaction.”). Rather, the parties’ disagreement revolves around the “identity of 

parties or privies” element and the “full and fair opportunity to litigate” exception.10 We 

address each of these topics in turn. 

1. Privity 

Generally, claim preclusion requires that the named parties in the first and second 

suits be identical. Pelt v. Utah, 539 F.3d 1271, 1281 (10th Cir. 2008). Thus, even where a 

plaintiff has already sued one or more parties liable for a particular loss, the plaintiff 

ordinarily is entitled to bring another suit against a new defendant, or defendants, based 

on the same loss. United States v. Lacey, 982 F.2d 410, 412 (10th Cir. 1992); McClelland 

v. Facteau, 610 F.2d 693, 695 n.1 (10th Cir. 1979). But an exception to this rule applies 

when there is “privity” between the defendant(s) bound by the first suit and the new 

defendant(s) named in the second suit. See Pelt, 539 F.3d at 1281; see also Mars Inc. v. 

Nippon Conlux Kabushiki-Kaisha, 58 F.3d 616, 619 (Fed. Cir. 1995) (“It is well settled 

. . . that claim preclusion may be invoked by and against those in privity with parties.”); 

18 Charles Alan Wright, Arthur R. Miller & Edward H. Cooper, Federal Practice and 

Procedure § 4407, at 153–56 (2d ed. 2002) [hereinafter Wright & Miller] (“A single 

 10 Although the district court stated that “Lenox does not dispute that it had a full 

and fair opportunity to litigate its claims in the prior arbitration,” Lenox contends it did 

dispute this point below, and it continues to dispute it on appeal. Our review of the record 

convinces us that Lenox adequately preserved this issue in the district court. 

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plaintiff . . . has as many causes of action as there are defendants to pursue, . . . subject to 

the constraint that claim preclusion may be invoked by a person in ‘privity’ with a former 

defendant . . . .” (footnote omitted)). 

Despite its long pedigree in the law, see, e.g., Cromwell v. Cty. of Sac, 94 U.S. 

351, 352 (1876), privity remains “an elusive concept,” In re L & S Indus., Inc., 989 F.2d 

929, 932 (7th Cir. 1993). This court has recognized, for instance, “that no definition of 

privity can be automatically applied in all cases involving the doctrine of res judicata.” 

Pelt, 539 F.3d at 1281 (internal quotation marks omitted). And today, “privity” often is 

used simply “to express the conclusion that nonparty preclusion is appropriate on any 

ground.” Id. (quoting Taylor v. Sturgell, 533 U.S. 880, 894 n.8 (2008)); see also 18A 

Wright & Miller, supra, § 4449, at 351 (“[I]t has come to be recognized that the privity 

label simply expresses a conclusion that preclusion is proper.”). But even so, the term 

pervades federal jurisprudence, and the standards and substantive relationships to which 

courts have associated it guide our analysis. 

Although this court has addressed, and found, privity in a variety of corporate 

contexts, see, e.g., Fox v. Maulding, 112 F.3d 453, 459–60 (10th Cir. 1997) (corporation 

and its officers and directors); Robinson v. Volkswagenwerk AG, 56 F.3d 1268, 1275 

(10th Cir. 1995) (subsidiary and its “controlling” parent); Lowell Staats Mining Co. v. 

Phila. Elec. Co., 878 F.2d 1271, 1276 (10th Cir. 1989) (corporation and its agent); Circle 

v. Jim Walter Homes, Inc., 654 F.2d 688, 689, 692 (10th Cir. 1981) (“subsidiary 

assignee” and its sister-subsidiary and parent), we have not yet considered whether 

privity exists in the precise circumstances presented here—i.e., between one member of 

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an anticompetitive enterprise and the enterprise’s other members. Lenox points to this 

dearth of precise precedent, arguing that our prior cases support finding privity between 

related but legally distinct entities only where there is an assignee-assignor or alterego/control relationship. In Lenox’s view, the evidence here reveals no such relationship 

between Defendants and MSD USA, thereby precluding a finding of privity. But we do 

not read our precedent so restrictively. And under the present facts we have little 

difficulty concluding privity exists. 

Whatever the outer boundaries of privity may be, this court has long held that “[a]t 

a minimum, privity requires a showing that the parties in the two actions are ‘really and 

substantially in interest the same.’” Lenox II, 762 F.3d at 1119 (quoting Pelt, 539 F.3d at 

1281); see also, e.g., St. Louis Baptist Temple, Inc. v. Fed. Deposit Ins. Corp., 605 F.2d 

1169, 1174 (10th Cir. 1979). As the above discussion demonstrates, the viability of 

Lenox’s antitrust claims depends on its ability to treat Defendants and MSD USA as a 

single entity, which Lenox has attempted to do since it initiated the earlier litigation 

against MSD USA. Thus, the crux of Lenox’s theory of liability is not just that 

Defendants and MSD USA are “substantially in interest the same,” Lenox II, 762 F.3d at 

1119, but that, functionally, they must be treated as actually the same. Cf. In re Colonial 

Mortg. Bankers Corp., 324 F.3d 12, 17–19 (1st Cir. 2003) (finding privity between two 

parties—which were either a parent and its subsidiary or sister subsidiaries—for purposes 

of defensive claim preclusion where they “were treated as a single entity” or “as peas in a 

pod” in the prior litigation). That is, by aggregating Defendants’ and MSD USA’s actions 

into the unitary conduct of a single entity, and by evaluating that unitary conduct for 

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purposes of antitrust liability, Lenox’s theory treats Defendants and MSD USA as the 

same entity and seeks to hold them liable for the same conduct. 

This court previously has found privity in analogous circumstances, outside the 

antitrust context. In Robinson v. Volkswagenwerk AG, plaintiffs brought and lost a 

products liability case against a subsidiary and then filed a second products liability case 

against the subsidiary’s parent on the theory that the parent “had a controlling 

relationship with” the subsidiary. 56 F.3d at 1275. As here, we did not resolve the 

plaintiffs’ contention that the asserted relationship actually rendered the parent liable on 

the merits because we concluded that, even “[i]f true, . . . this ‘near alter ego’ relationship 

would be sufficient to establish ‘privity’ between the two corporations such that [the 

parent] is entitled to assert the previous judgment as a bar to the claim now asserted.” Id.

Contrary to Lenox’s contentions, Robinson is not wholly inapposite simply because the 

relationship alleged there was “controlling.” Regardless of the precise relationship 

asserted, Robinson supports the proposition that if the parties were functionally or 

“near[ly]” acting as one, then they are in privity, such that a final judgment against one 

bars a subsequent action against the other for the same injury. See id. Such is the situation 

here.11

 11 Numerous other circuits have found privity between related corporations 

without a concomitant finding of alter-ego status or an otherwise controlling relationship. 

See, e.g., Rabo Agrifinance, Inc. v. Terra XXI, Ltd., 583 F.3d 348, 353 (5th Cir. 2009) 

(finding relationships among various entities involved in same large-scale farming 

enterprise “sufficiently close to bind all of them . . . to the judgment in the [prior action],” 

without describing nature of relationships); Anchor Glass Container Corp. v. 

Buschmeier, 426 F.3d 872, 879–80 (7th Cir. 2005) (finding privity between parent and 

previously sued subsidiary based on parent’s ownership of subsidiary and fact that 

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Our decision in Robinson also undermines Lenox’s attempt to discount the 

inherent conflict between its assertions that Defendants’ corporate independence must be 

respected for privity purposes but disregarded for antitrust-liability purposes. 

Acknowledging this discord, Lenox contends that, under Copperweld, it is appropriate to 

ignore parties’ legal separateness when assessing Sherman Act liability, but that it is 

inappropriate to do so outside that context. But in Robinson, we identified the assumption 

integral to the plaintiff’s theory of liability and applied it with equal force for purposes of 

assessing privity. See 56 F.3d at 1275. It is therefore irrelevant whether Lenox is correct 

 

subsidiary’s executives acted on behalf of or in interest of parent); In re Colonial Mortg. 

Bankers Corp., 324 F.3d at 18–19; Mars Inc., 58 F.3d at 619; Lubrizol Corp. v. Exxon 

Corp., 929 F.2d 960, 966 (3d Cir. 1991); Cent. Transp., Inc. v. Four Phase Sys., Inc., 936 

F.2d 256, 260 & n.2 (6th Cir. 1991) (finding privity between corporation named as a 

party in prior arbitration and two of its sister subsidiaries; and noting defendants’ 

argument that entities had “close affiliation, joint legal representation and identity of 

interests”); In re Teltronics Servs., Inc., 762 F.2d 185, 191–92 (2d Cir. 1985) (finding 

privity between various corporate entities involved in successive lawsuits, seemingly on 

the basis of common ownership alone). See also 18A Wright & Miller, supra, § 4460, at 

639 (“Corporate parents and subsidiaries have been found in privity so as to enable one to 

assert claim preclusion against a plaintiff who had already [brought] an action against the 

other.”). 

In fact, several circuits have determined that where, as here, closely related 

defendants are sued by the same plaintiff and the subsequent defendant seeks to invoke 

claim preclusion based on the earlier judgment, traditional privity is not necessary. See, 

e.g., FleetBoston Fin. Corp. v. Alt, 638 F.3d 70, 80–81 (1st Cir. 2011) (“We, along with 

other circuits, have long held that claim preclusion applies if the new defendant is closely 

related to a defendant from the original action—who was not named in the previous law 

suit, not merely when the two defendants are in privity.” (quoting Airframe Sys., Inc. v. 

Raytheon Co., 601 F.3d 9, 17 (1st Cir. 2010))); Midcontinent Broad. Co. v. Dresser 

Indus., Inc., 669 F.2d 564, 567 (8th Cir. 1982) (“[W]here, as here, the parties have such a 

close relationship, bordering on near identity, they are for purposes of res judicata the 

same parties.”); Gambocz v. Yelencsics, 468 F.2d 837, 840–41 (3d Cir. 1972). See also 47 

Am. Jur. 2d Judgments § 577 (noting that “[c]ourts have applied nonmutual res judicata 

where there existed a close or significant relationship between defendants in the first 

action and defendants in the second action who are asserting res judicata against the same 

plaintiff,” and referring to this standard as “privity-like”). 

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that Copperweld’s single-entity rule cannot be invoked outside the context of an antitrust 

case, because Lenox did invoke it in this antitrust case. Having done so, Lenox cannot 

now “have it both ways: either [Defendants and MSD USA] are in privity with one 

another for both liability and res judicata purposes, or they are not in privity for either 

purpose.” See R.G. Fin. Corp. v. Vergara-Nunez, 446 F.3d 178, 186 (1st Cir. 2006) 

(analyzing privity under Puerto Rico res judicata statute, which is construed 

“pragmatically”); see also id. (“[W]e do not see how [the sister subsidiary] and [the 

parent] can be tied so closely to [another subsidiary named in the prior action] for 

purposes of the counterclaim and yet, at the same time, be considered distinct from [that 

other subsidiary] for purposes of the res judicata analysis.”); Futura Dev. Corp. v. Centex 

Corp., 761 F.2d 33, 43–44 (1st Cir. 1985) (similar); cf. Kennedy v. Mendoza-Martinez, 

372 U.S. 144, 195 (1963) (Brennan, J., concurring) (“[A party] cannot have it both ways 

in the same case.”). 

In sum, we agree with Defendants that, if Lenox is correct that Defendants were 

operating as a single entity for antitrust purposes, they are in privity with MSD USA. As 

a result, that element of claim preclusion is satisfied. See King, 117 F.3d at 445. We now 

turn to the parties’ dispute over the “full and fair opportunity to litigate” exception to 

claim preclusion. 

2. Full and Fair Opportunity to Litigate 

As noted above, even where the requisite elements of claim preclusion are present, 

its application is inappropriate if “the party seeking to avoid preclusion did not have a full 

and fair opportunity to litigate the claim in the prior suit.” MACTEC, 427 F.3d at 831 

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(internal quotation marks omitted). This narrow exception applies only where the 

requirements of due process were not afforded, see Crocog Co. v. Reeves, 992 F.2d 267, 

270 (10th Cir. 1993)—where a party shows “a deficiency that would undermine the 

fundamental fairness of the original proceedings,” Nwosun, 124 F.3d at 1257 (citation 

omitted). See also Mass. Sch. of Law at Andover, Inc. v. Am. Bar Ass’n, 142 F.3d 26, 39 

(1st Cir. 1998) (“[A]s long as a prior . . . judgment is procured in a manner that satisfies 

due process concerns, the requisite ‘full and fair opportunity’ existed.”); 18 Wright & 

Miller, supra, § 4415, at 366 (opining that full and fair opportunity exception “mean[s] 

no more than that claim preclusion cannot arise from proceedings that deny due 

process”). The fairness of the prior proceeding “is determined by examining any 

procedural limitations, the party’s incentive to fully litigate the claim, and whether 

effective litigation was limited by the nature or relationship of the parties.” Nwosun, 124 

F.3d at 1257–58. 

Here, Lenox asserts that it lacked a full and fair opportunity to litigate its § 2 

monopolization and attempted monopolization claims in the prior proceeding against 

MSD USA. Lenox’s various contentions divide loosely into two main arguments. We 

address and reject these arguments in turn. 

Lenox first contends it did not have a full and fair opportunity to litigate its 

antitrust claims because it was unaware of Defendants’ involvement—and thus did not 

know of the facts necessary to establish § 2 liability—when it filed the prior lawsuit.12

 12 Because it will not affect the outcome of this appeal, we give Lenox the benefit 

of the doubt and both (1) construe its brief as asserting that Defendants’ involvement 

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Cf. 18 Wright & Miller, supra, § 4415, at 388 (stating that, under certain circumstances, 

the later filing of a new claim arising from the same transaction at issue in a prior action 

“may . . . be excused because the plaintiff did not know the full dimensions of the claim 

at the time of the first action.”). But claim preclusion applies to all claims arising from 

the same underlying transaction “even where the new claims are based on newly 

discovered evidence, unless the evidence was either fraudulently concealed or it could 

not have been discovered with due diligence.” In re Adelphia Recovery Tr., 634 F.3d 678, 

695 (2d Cir. 2011) (internal quotation marks omitted); accord Capitol Hill Grp. v. 

Pillsbury, Winthrop, Shaw, Pittman, LLC, 569 F.3d 485, 491 (D.C. Cir. 2009); McCarty 

v. First of Ga. Ins. Co., 713 F.2d 609, 612 (10th Cir. 1983) (“The rule against splitting 

causes of action serves no purpose if a plaintiff cannot reasonably be expected to include 

all claims in the first action.”); see also Robinson, 56 F.3d at 1274 n.5 (“[C]oncealment 

of material information by a party may justify a refusal to give preclusive effect to a 

judgment.”). And here, there is nothing to suggest these circumstances were present. 

 

constitutes facts necessary to establish its § 2 claims, and (2) assume for the sake of 

argument that this assertion is correct. Lenox’s discussion suggests, however, that its real 

complaint is not that its ignorance of Defendants’ involvement deprived it of a fair 

opportunity to litigate its current claims in the prior proceeding, but that this lack of 

knowledge deprived it of a fair opportunity to litigate its current claims against 

Defendants in the prior proceeding. This focus misinterprets the nature of the preclusion 

inquiry once privity is established. What matters is whether Lenox had a full and fair 

opportunity to litigate its § 2 claims against MSD USA—if it did, then it is barred from 

later bringing those claims against MSD USA or any entity in privity with MSD USA. See 

Lowell Staats, 878 F.2d at 1277 (“If Smith is in privity with Nuclear, then res judicata 

bars claims against Smith which could have been raised in the [prior] litigation against 

Nuclear.”); Spence v. Latting, 512 F.2d 93, 98 (10th Cir. 1975) (“Where a second suit 

between the same parties or their privies is on the same [transaction], the final judgment 

in the prior action is conclusive as to all matters which were actually litigated as well as 

those which could have been litigated.” (emphases added)). 

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First, there is no evidence that Lenox was prevented from discovering the facts 

supporting its antitrust claims “by [Defendants’ or MSD USA’s] fraud, deception, or 

wrongful conduct.” See McCarty, 713 F.2d at 613 (citation omitted). MSD USA’s 

assertions, during discovery in the prior suit, that it was the only Medtronic entity that 

contracted and dealt directly with Lenox were factually accurate statements, and its 

resistance to providing information about PS Medical and MSD Japan was validly 

premised on their status as non-parties. Contrary to Lenox’s implications, none of its 

cited examples of Defendants’ and MSD USA’s behavior amounts to wrongful or 

fraudulent conduct aimed at concealing Defendants’ involvement. Cf. Mass. Sch. of Law, 

142 F.3d at 39 (“[A]n opportunity to litigate is no less ‘full’ or ‘fair’ simply because the 

forum court enforces conventional limitations on pretrial discovery.”). 

Moreover, Lenox cannot seriously maintain that Defendants’ involvement could 

not have been discovered with due diligence because Lenox did, in fact, discover it. See 

Capitol Hill Grp., 569 F.3d at 491–92 (new claims were precluded where plaintiff knew 

of underlying operative facts during prior proceeding). While the record suggests Lenox 

knew of other Medtronic entities’ involvement even before its claims against MSD USA 

were sent to arbitration, there is no dispute that, at the latest, Lenox discovered these facts 

during the pendency of the arbitration. Lenox is misguided in insisting that, to have had a 

fair opportunity to litigate, it must have known of these facts at the time it filed its 

original complaint. 

It is true that “[t]he filing of the plaintiff’s complaint frames the scope of 

litigation, establishing a transactional nexus into which facts and claims are fitted or 

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excluded for purposes of claim preclusion,” Hatch v. Boulder Town Council, 471 F.3d 

1142, 1150 (10th Cir. 2006), and that, broadly speaking, claim preclusion does not bar 

subsequent litigation of new claims based on facts the plaintiff did not and could not 

know when it filed its complaint, see Doe v. Allied-Signal, Inc., 985 F.2d 908, 914 (7th 

Cir. 1993); cf. Mitchell v. City of Moore, 218 F.3d 1190, 1202–03 (10th Cir. 2000). 

Critically, though, if the plaintiff discovers facts during the litigation that stem from the 

same underlying transaction, it must supplement its complaint with any new theories 

those facts support. Stone, 453 F.3d at 1278–79; see also id. at 1280 (“[A] plaintiff’s 

obligation to assert claims arising out of the same transaction continues throughout the 

course of the litigation.” (emphasis omitted)). A subsequent lawsuit will be allowed only 

if the facts discovered mid-litigation give rise to “new and independent claims, not part of 

the previous transaction.” Hatch, 471 F.3d at 1150. Put differently, “a plaintiff can[not] 

avoid supplementing his complaint with facts that are part of the same transaction 

asserted in the complaint, in the hope of bringing a new action arising out of the same 

transaction on some later occasion.” Id.13

Lenox attempts to avoid the implications of these cases through its second 

argument in favor of the full and fair opportunity exception. According to Lenox, it could 

not have added its § 2 claims when it discovered Defendants’ involvement because, at 

 13 The Seventh Circuit case Lenox relies on—Doe v. Allied-Signal, Inc.—does not 

provide otherwise. See 985 F.2d at 914–15 (holding that first action for negligent failure 

to keep plaintiff safe from rape at workplace was distinct from subsequent action based 

on employer’s misrepresentation of plaintiff’s employment status because facts forming 

basis of second action arose from different transaction and damages asserted in second 

action did not accrue until first action ended). 

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that time, it “was deep in the arbitration against MSD USA” and the arbitrators “had no 

jurisdiction over claims between Lenox and Defendants.” Again, we are not persuaded. 

“Essential to the application of the doctrine of res judicata is the principle that the 

previously unlitigated claim to be precluded could and should have been brought in the 

earlier litigation.” Plotner, 224 F.3d at 1170 (quoting D-1 Enters., Inc. v. Commercial 

State Bank, 864 F.2d 36, 38 (5th Cir. 1989)). And as Lenox notes, it follows from this 

principle that the preclusion doctrine will not later bar a claim an arbitration panel did not 

have jurisdiction to hear. See Clark v. Bear Stearns & Co., 966 F.2d 1318, 1321 (9th Cir. 

1992); 18B Wright & Miller, supra, § 4475.1, at 510–11 (“If the arbitrator lacked 

authority to entertain the matters advanced in the later litigation, claim preclusion does 

not apply.”) 

But Lenox argues only that the arbitration panel lacked jurisdiction over 

Defendants. Lenox does not contend that the panel lacked jurisdiction over Sherman Act 

claims or that Lenox could not have brought its present § 2 claims against MSD USA 

alone. And as we noted above, see supra note 11, these are the relevant considerations in 

assessing the full and fair opportunity exception. See Nwosun, 124 F.3d at 1257 (“Res 

judicata . . . requires that the party had a full and fair opportunity to litigate the claim in 

the prior suit.” (emphasis added)); see also Lowell Staats, 878 F.2d at 1277 (“If Smith is 

in privity with Nuclear, then res judicata bars claims against Smith which could have 

been raised in the [prior] litigation against Nuclear.”). 

Moreover, even if we determined the arbitration panel did not have jurisdiction 

over Lenox’s antitrust claims and credited Lenox’s belief that it could not have had a fair 

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opportunity to litigate those claims if it was unable to join Defendants as parties, we still 

would conclude preclusion is proper. In this case, the role of the arbitration panel is a 

mere distraction. Lenox initiated the prior proceeding against MSD USA in federal court, 

and the federal action was administratively closed and stayed while the parties 

participated in arbitration. When the arbitration concluded, the federal action remained 

pending, and it was not until Lenox and MSD USA jointly agreed to a voluntary 

dismissal with prejudice that the federal action came to an end. Thus, regardless of the 

arbitration, Lenox could have sought to amend its complaint to add its § 2 antitrust claims 

and to join Defendants as parties at any time during or after the arbitration proceeding but 

before agreeing to dismiss the federal action, with prejudice. See Katz v. Gerardi, 655 

F.3d 1212, 1215–16 (10th Cir. 2011) (recounting complex procedural history involving 

multiple motions to amend complaints during arbitration, which added claims and parties 

and required court to administratively reopen cases during, and reclose them pending, 

arbitration of discrete claims). Lenox has not alleged that the district court in the original 

proceeding lacked jurisdiction over Defendants or over Lenox’s claims under § 2 of the 

Sherman Act, nor could it. 

We therefore reject Lenox’s contention that it was jurisdictionally barred from 

bringing its § 2 claims in the prior proceeding and for that reason lacked a full and fair 

opportunity to litigate those claims. Cf. MACTEC, 427 F.3d at 832 (rejecting plaintiff’s 

full-and-fair-opportunity argument even where prior proceeding was initiated in 

arbitration and arbitrator was jurisdictionally barred from considering plaintiff’s theory 

because plaintiff had opportunity to assert theory in subsequent application to district 

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court to vacate arbitral award); Katz, 655 F.3d at 1219 n.5 (concluding that, where motion 

to amend was granted in one case, plaintiff’s argument that it “cannot pursue its amended 

complaint in the other [parallel] case because it is administratively closed until arbitration 

is completed . . . is not a valid reason to ignore [plaintiff’s] claim splitting”). Seeing no 

other indication of “a deficiency that would undermine the fundamental fairness of” 

Lenox’s litigation with MSD USA, we conclude Lenox was afforded a full and fair 

opportunity to litigate its antitrust claims. See Nwosun, 124 F.3d at 1257. Accordingly, 

because the requisite elements of claim preclusion are satisfied, Lenox’s claims are 

barred. See MACTEC, 427 F.3d at 831. 

IV. CONCLUSION 

Lenox was entitled to pursue its § 2 monopolization and attempted monopolization 

claims under the theory that Defendants, together with MSD USA, are a single entity for 

antitrust purposes, and to prove the elements of those claims based on the collective 

conduct attributable to the enterprise as a whole. However, if Lenox prevailed in 

establishing that Defendants and MSD USA were acting as a single enterprise, it would 

necessarily also establish privity between Defendants and MSD USA for purposes of 

claim preclusion. And because the remaining requirements of preclusion are satisfied, 

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Lenox’s claims in this case are barred. We therefore AFFIRM the district court’s grant of 

summary judgment for Defendants, but do so on different grounds.14

 14 Lenox initially filed an unopposed motion to seal Volume VIII of the Joint 

Appendix, which consists of thirteen documents filed under seal in the district court 

pursuant to a protective order. This court issued an order requesting additional 

justification to seal, and, in its response, Lenox abandoned its request to seal the 

documents. Responding to the same order, Defendants requested that only two of the 

thirteen documents remain sealed: a 2013 motion (JA 1481–1562) and an expert’s 

declaration (JA 1460–80). Defendants asserted that these two documents contain 

sensitive business information of Defendants and third-parties. 

We have reviewed these documents and agree. “[A] party may overcome the 

presumption in favor of public access to judicial records by demonstrating the [portions 

of the record] contain sources of business information that might harm a litigant’s 

competitive standing.” Deherrera v. Decker Truck Line, Inc., 820 F.3d 1147, 1162 n.8 

(10th Cir. 2016) (internal quotation marks omitted). “And the public’s interest in access 

to judicial records is lessened when the contents are not used to determine the litigant’s 

substantive legal rights.” Id. (alteration and internal quotation marks omitted). Because 

these two documents contain proprietary business information not only of Defendants but 

of non-parties, comprise a small portion of the overall record, and play no role in our 

resolution of this appeal, we grant the motion to seal as to these two documents. See id.; 

AST Sports Sci., Inc. v. CLF Distribution Ltd., 514 F.3d 1054, 1057 n.1 (10th Cir. 2008). 

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