Atlas Biologicals v. Biowest ( 2022 )


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  • Appellate Case: 20-1401    Document: 010110751168      Date Filed: 10/11/2022 Page: 1
    FILED
    United States Court of Appeals
    Tenth Circuit
    PUBLISH
    October 11, 2022
    UNITED STATES COURT OF APPEALS
    Christopher M. Wolpert
    FOR THE TENTH CIRCUIT                     Clerk of Court
    _________________________________
    ATLAS BIOLOGICALS, INC., a Colorado
    corporation,
    Plaintiff Counter Defendant -
    Appellee,
    v.                                                         No. 20-1401
    THOMAS JAMES KUTRUBES, an
    individual,
    Defendant,
    and
    BIOWEST, LLC, a Missouri limited
    liability company,
    Defendant Counter Plaintiff -
    Appellant.
    _________________________________
    Appeal from the United States District Court
    for the District of Colorado
    (D.C. No. 1:18-CV-00969-CMA-MEH)
    _________________________________
    Andrew B. Reid, Reid Law, LLC, Boulder, Colorado, for Defendant Counter Plaintiff -
    Appellant.
    John D. Root, Lind Ottenhoff & Root, LLP, Windsor, Colorado, for Plaintiff Counter
    Defendant - Appellee.
    _________________________________
    Before HOLMES, Chief Judge, BALDOCK, and MATHESON, Circuit Judges.
    _________________________________
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 2
    HOLMES, Chief Judge.
    _________________________________
    At face value, this case is about whether a stock transfer is valid under
    Colorado law. But to answer this question, we must first answer certain Article III
    jurisdictional questions. This dispute arises from a closely related but independent
    proceeding. There, Plaintiff-Appellee Atlas Biologicals, Inc. (“Atlas”) sued its
    former employee Thomas Kutrubes for various federal intellectual-property claims.
    Mr. Kutrubes, seemingly as an attempt to thwart Atlas’s ability to collect a likely
    judgment against him, transferred his 7% interest in Atlas to Atlas’s rival Defendant-
    Appellant Biowest, LLC (“Biowest”). Once Atlas found out about this alleged
    transfer, it sought a writ of attachment in the district court against Mr. Kutrubes’s
    interest in Atlas, which the district court granted. But in granting the writ, the district
    court explained that it did not know what interest Mr. Kutrubes still had in Atlas and
    raised the idea of Atlas filing a separate declaratory judgment action.
    Atlas did so, and that is the lawsuit before us. And we now must decide
    whether the district court properly found in favor of Atlas in this action in light of the
    fact that it did not have an independent source of federal jurisdiction to decide the
    question of state law that the action presented—a question that implicated a third
    party not involved in the initial suit, Biowest. Reviewing these matters de novo, we
    conclude that the district court acted properly and within the scope of its jurisdiction,
    and we further agree with the district court’s resolution of the merits. Accordingly,
    exercising jurisdiction under 
    28 U.S.C. § 1291
    , we affirm.
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    I
    To understand the contours of this case, one must understand the proceedings
    in a related case. Atlas “specializes in the production of bovine serum-based
    products that are used for cell culture and research in the medical, veterinary,
    and biological sciences.” Atlas Biologicals, Inc. v. Kutrubes (Atlas I), No. 15-CV-
    00355, 
    2019 WL 4594274
    , at *1 (D. Colo. Sept. 23, 2019) (unpublished) (footnote
    omitted). Mr. Kutrubes “began working for Atlas as an intern in 2005 and was hired as
    an employee in 2006, initially serving as a regional sales manager.” 
    Id. at *2
    . Several
    years later, Mr. Kutrubes became a shareholder and ultimately came to own a 7% stake in
    Atlas. He also was eventually promoted to National Sales Manager and was
    subsequently elected to Atlas’s Board of Directors.
    Nevertheless, Mr. Kutrubes began “developing a business plan to compete
    with Atlas while he was still in Atlas’s employ.” 
    Id.
     In late 2014, Mr. Kutrubes
    began taking steps to formalize his venture, and he ultimately incorporated a business
    in Colorado—Peak Serum, Inc. (“Peak Serum”). Around this time and while still
    employed at Atlas, Mr. Kutrubes began emailing himself “certain information,
    documentation, and data,” such as “Atlas’s customer contact lists, a supplier
    agreement; its quality manual; its organizational chart; a contract manufacturing
    statement; proofs of labels; a marketing brochure; and email exchanges
    about Atlas’s products, among others.” 
    Id.
    However, as a part of his job description, Mr. Kutrubes had signed a document
    stating that he “[u]nderst[ood] and [would] adher[e] to company policies and
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    procedures,” which included “a policy entitled ‘Control of
    Confidentiality/Proprietary Information’ that prohibited all employees from
    disclosing without the company’s prior written authorization any ‘Confidential and/or
    Proprietary Information.’” 
    Id.
     (first alteration in original). He also sent emails to
    Atlas’s customers and suppliers in an attempt to secure business for Peak Serum. Mr.
    Kutrubes later admitted that he breached his duty of loyalty to Atlas during this time.
    On December 16, 2014, Mr. Kutrubes tendered his resignation letter, with an
    intended effective date of December 19. He also requested the company to buy out
    his 7% stake for $224,000.00 based on “the recent appraisal of the company at
    $3,200,000.00.” 
    Id.
     A few days after Mr. Kutrubes gave notice of his resignation,
    Atlas discovered that Mr. Kutrubes had been sending company documents to his
    personal email account and had been attempting to solicit Atlas’s clients and
    suppliers. As a result, “Atlas ‘decline[d] [Mr. Kutrubes’s] resignation’ and ‘instead
    terminate[d] his directorship and employment for cause’ on December 27, 2014.” 
    Id. at *3
     (first and third alterations in original). In a letter detailing its findings, Atlas
    demanded Mr. Kutrubes cease using all materials obtained from Atlas, return those
    materials to the company, abandon all plans to start a similar business as Atlas, and
    surrender all shares to Atlas.
    On February 20, 2015, Atlas sued Mr. Kutrubes and Peak Serum in the District
    of Colorado. After more than a year of discovery, Atlas filed an amended complaint
    in which it asserted various intellectual-property claims, such as claims for federal
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    trademark infringement and misappropriation of trade secrets. The district court
    conducted a five-day bench trial between March 5, 2018, and March 9, 2018.
    On April 4, 2018, Mr. Kutrubes purportedly sold his 7% interest in Atlas to
    Biowest. See Aplt.’s App., Vol. II, at 46–50 (Stock Sale and Purchase Agreement,
    executed Apr. 4, 2018). The next day, Mr. Kutrubes, through counsel, notified Atlas that
    he had sold his shares to Biowest. “Biowest did not receive delivery of an indorsed
    certificate for [Mr.] Kutrubes’s shares,” because “Atlas had not created stock certificates
    for [Mr.] Kutrubes’s shares at the time of the Purported Transfer,” and only did so after
    Mr. Kutrubes had transferred the shares. Atlas Biologicals, Inc. v. Kutrubes (Atlas II),
    
    474 F. Supp. 3d 1188
    , 1192 (D. Colo. 2020).
    In response, Atlas filed “an Emergency Ex Parte Motion for Pre-Judgment
    Attachment and Injunctive Relief Against Further Conveyances of Assets by [Mr.]
    Kutrubes,” in which it argued the “transfer was unsuccessful (i.e., not completed) because
    ‘no endorsed share certificate ha[d] been tendered nor a request for a transfer on the
    books and records of Atlas . . . ha[d] been made.’” Atlas I, 
    2019 WL 4594274
    , at *5
    (second and third alterations and omission in original) (quoting Atlas’s emergency
    motion). And Atlas requested, as relief, “prejudgment attachment of [Mr.] Kutrubes’s
    shares of its stocks pursuant to Colorado Rule of Civil Procedure 102(c).” 
    Id.
     In
    response, Mr. Kutrubes argued he had successfully transferred his stock to Biowest and
    requested an “injunction preventing Atlas and its shareholders [and] officers . . . from
    holding any shareholder meetings, amending corporate bylaws, or otherwise taking
    actions that would impact any minority shareholder until such time as the dispute with
    5
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    respect to ownership of shares is resolved.” 
    Id.
     (alteration and omission in original). The
    district court “issued a Writ of Attachment on April 24, 2018, that ordered the Sheriff of
    Larimer County, Colorado, to ‘attach and safely keep any stock of [Atlas] owned by [Mr.
    Kutrubes].’” 
    Id.
     (first alteration in original) (quoting writ of attachment).
    The district court nevertheless noted at the hearing concerning the issuance of
    the writ of attachment, that it did not know whether the transfer of stock was valid—
    whether it had been “consummated in full.” Aplt.’s App., Vol. IV, at 144. Because
    of this uncertainty as to the validity of the transfer, the district court told the parties
    the following:
    So I am going to issue an order of pre-
    judgment attachment as to whatever
    interest remains in Mr. Kutrubes for the
    7 percent of stock that he owns in Atlas.
    I don’t know what that is, and that is not
    going to be decided by me unless you all
    file a separate action in this Court for
    either declaratory judgment or for
    further    undoing      the   fraudulent
    conveyance.
    
    Id.
     (emphasis added). Atlas “informed the Court that it had served the Writ of
    Attachment on [Mr.] Kutrubes on May 3, 2018, and that it had ‘surrendered
    [Mr. Kutrubes’s] stock certificates to the Larimer County Sheriff on May 9,
    2018.’” Atlas II, 474 F. Supp. 3d at 1191.
    The next day, Atlas sued Biowest and Mr. Kutrubes. Atlas sought “declaratory
    relief pursuant [to] Fed. R. Civ. P. 57 to void the purported transfer of stock [from
    Mr. Kutrubes to Biowest] under Article 8 of the Colorado Uniform Commercial Code
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    Appellate Case: 20-1401      Document: 010110751168         Date Filed: 10/11/2022      Page: 7
    [i.e., CUCC] or, in the alternative, to avoid and recover a fraudulent transfer pursuant
    to the Colorado Uniform Fraudulent Conveyances Act C.R.S. §§ 38-8-101[,] et
    seq. (CUFTA).” Id.
    On June 25, 2018, Biowest filed a motion to dismiss Atlas’s claims pursuant to
    Fed. R. Civ. P. 12(b)(1) on the grounds that the district court lacked subject-matter
    jurisdiction over the case and that Atlas lacked standing to sue Biowest. See Atlas II,
    No. 18-CV-00969, 
    2019 WL 1200809
    , at *2, *4 (D. Colo. Mar. 14, 2019) (unpublished).
    Biowest also argued that, if the district court indeed had subject-matter jurisdiction, the
    suit should be dismissed for failure to state a claim.
    The district court rejected Biowest’s argument “that the Court does not have
    ancillary jurisdiction over the action because it is ‘separated’ from the Primary Suit
    [i.e., Atlas I], relies on state claims, and lacks ‘an independent federal jurisdiction
    basis.’” 
    Id. at *5
    . The district court explained that “this case ‘involves the second,
    less common purpose—ancillary jurisdiction over collateral proceedings,’”; that is,
    jurisdiction “to enable a court to function successfully, that is, to manage its
    proceedings, vindicate its authority, and effectuate its decrees.” 
    Id.
     at *5–6 (quoting
    Kokkonen v. Guardian Life Ins. Co. of Am., 
    511 U.S. 375
    , 380 (1994)). Therefore,
    the court reasoned that it was “satisfied that it has ancillary jurisdiction over” Atlas’s
    claims because Atlas “seeks to avoid an allegedly fraudulent transfer of stock to
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    Defendant Biowest, LLC from Defendant Kutrubes, against whom [Atlas] seeks a
    judgment in the Primary Suit [i.e., Atlas I].” 1 Id. at *6.
    Next, the district court concluded that Atlas indeed had standing to sue
    Biowest for a declaratory judgment to void the transfer. Because the declaratory
    judgment was ostensibly brought under Colorado’s Uniform Declaratory Judgments
    Law, 
    Colo. Rev. Stat. §§ 13-51-101
    , et seq., the district court looked to Colorado’s
    law of standing, which states that “a plaintiff must assert a legal basis on which a
    claim for relief can be grounded. The plaintiff must allege an injury in fact to a
    legally protected or cognizable interest.” Atlas II, 
    2019 WL 1200809
    , at *7 (quoting
    Farmers Ins. Exch. v. Dist. Ct. for the Fourth Jud. Dist., 
    862 P.2d 944
    , 947 (Colo.
    1993)). And the district court explained that under Colorado law a declaratory
    judgment was appropriate “when the rights asserted by the plaintiff are present and
    cognizable ones . . . [and] a declaratory judgment would effect a change in the
    plaintiff’s present rights or status.” 
    Id.
     (emphasis omitted) (quoting Farmers Ins.
    Exch., 862 P.2d at 947).
    With this in mind, the district court concluded that Atlas had standing to sue
    “because the declaratory judgment that it seeks—that purported transfer of stock
    1
    The district court did find that it did not have jurisdiction over Atlas’s
    claim for “civil conspiracy,” because it is an “entirely new and original” theory of
    liability, and the Supreme Court has “cautioned against the exercise of jurisdiction
    over proceedings that are ‘entirely new and original’ . . . or where ‘the relief sought
    is of a different kind or on a different principle’ than that of the prior decree.” Atlas
    II, 
    2019 WL 1200809
    , at *6 (omission in original) (quoting Peacock v. Thomas, 
    516 U.S. 349
    , 358 (1996)).
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    from Defendant [Kutrubes] to Defendant Biowest, LLC ‘is void and of no effect,’ . . .
    would effect a change in its present rights or status.” Id. at *8. Specifically, the
    district court explained that Atlas’s status as issuer of the stock is affected by whether
    the transfer was valid because if it was valid, Atlas would be required to register the
    transfer. And also, the writ of attachment was predicated on an understanding that
    the transfer was invalid and Atlas had already surrendered the shares to the Larimer
    County police department. Id. 2
    On April 19, 2019, Atlas moved for summary judgment on its claim for
    declaratory relief to void the stock transfer. In response, Mr. Kutrubes argued that
    2
    The district court also denied Biowest’s motion to dismiss as to Atlas’s
    first three claims. First, it concluded that Atlas had stated a claim for a declaratory
    judgment against Biowest and Mr. Kutrubes because it “alleges that the transfer of
    stock from Defendant Kutrubes to Defendant Biowest, LLC was ineffectual under the
    [C]UCC because Defendant Biowest, LLC does not possess a stock certificate and
    Plaintiff has not registered any certificate in Defendant Biowest, LLC’s name.” Atlas
    II, 
    2019 WL 1200809
    , at *9. Second, the district court concluded that Atlas had
    stated a claim for actual fraud, because Mr. Kutrubes transferred “his shares ‘with the
    actual intent to hinder, delay, or defraud [Plaintiff].’” 
    Id.
     (alteration in original).
    The district court also explained that Atlas could bring this claim against Biowest
    because “CUFTA allows for a judgment ‘against a person other than the debtor’ if
    that person ‘also acts with wrongful intent’” and “Defendant Biowest, LLC acted
    with actual intent to defraud Plaintiff” when it accepted the transfer with knowledge
    of the ongoing trial and the likelihood of a judgment against Mr. Kutrubes. 
    Id. at *10
    . Lastly, the district court concluded that Atlas had stated a constructive fraud
    claim against Mr. Kutrubes and Biowest. Although noting that “the citations to
    CUFTA’s remedy provisions in Plaintiff’s Complaint are significantly flawed,” it
    explained that Plaintiff has adequately alleged that Defendant Biowest, LLC may be
    liable for a judgment for the value of the stocks transferred pursuant to Section 38-8-
    109(2). 
    Id.
     at *10–11. Section 38-8-109(2) states that an aggrieved creditor “may
    recover judgment for the value of the asset transferred . . . or the amount necessary to
    satisfy the creditor’s claim, whichever is less,” and that this judgment may be entered
    against “[t]he first transferee of the asset.” 
    Id. at *11
     (alteration and omission in
    original) (quoting 
    Colo. Rev. Stat. § 38-8-109
    (2), -109(2)(a)).
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    “the transfer was valid because Defendants substantially complied with the [C]UCC
    and an equitable transfer of stock occurred.” Atlas II, 474 F. Supp. 3d at 1191–92.
    And Biowest, for its part, “argue[d] that Plaintiff’s Motion should be denied
    because, inter alia, Article 8 of the [C]UCC is irrelevant to the transfer of ownership
    of stock and an equitable transfer of stock occurred.” Id. at 1192. However, the
    district court granted summary judgment in favor of Atlas. At the outset, it did reject
    Atlas’s arguments that the shares were certificated securities because its bylaws
    required its stock certificate to be “certificated”; instead, the district court found that
    the shares were uncertificated securities at the time of the transfer because Atlas only
    created the stock certificates for the shares after the alleged transfer. Id. at 1193.
    Yet, concluding that “Article 8 of the [C]UCC governs the Purported Transfer
    and its delivery requirements must be satisfied for legal ownership of stock to
    transfer,” the district court found that the transfer did not meet the requirements for
    delivery of uncertificated securities under Article 8. Id. at 1194. The [C]UCC
    provides that delivery of an uncertificated security to a purchaser occurs when either
    of the following conditions is satisfied: (1) “The issuer registers the purchaser as the
    registered owner, upon original issue or registration of transfer; or (2) Another
    person, other than a securities intermediary, either becomes the registered owner of
    the uncertificated security on behalf of the purchaser or, having previously become
    the registered owner, acknowledges that it holds for the purchaser.” Id. (quoting
    
    Colo. Rev. Stat. § 4-8-301
     (2019)).
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    The district court concluded that neither of the foregoing two conditions was
    met. The district court determined that the first condition was not satisfied because
    Atlas did not register Biowest as the registered owner of the security and rejected
    Biowest’s argument that Atlas’s purported obligation to register satisfied this
    condition. Next, the district court explained that the second condition—which, as
    applied here, would mean that Mr. Kutrubes held the stock for Biowest—was not
    satisfied, because Atlas never received any statement that Mr. Kutrubes held the
    stock for the benefit of Biowest. And Mr. Kutrubes indicated he was the owner of
    the stock and did not mention that he owned it for the benefit of Biowest when he
    made a shareholder request to Atlas on June 18, 2019. 3 Because Biowest did not
    satisfy either condition for delivery of uncertificated securities, the district court
    concluded that “ownership of [Mr.] Kutrubes’s stock did not transfer to Biowest.”
    
    Id. at 1195
    .
    The district court also rejected the contention that the stock had been equitably
    transferred to Biowest. Even though, reasoned the court, “Colorado recognizes
    equitable transfer of corporate stock and that the adoption of the [C]UCC does not
    abrogate the principle allowing such equitable transfer, ‘equitable title claims are
    recognized in Colorado only where the rights of third parties would not be affected,’”
    3
    Specifically, on that date in June 2019, Mr. Kutrubes provided a signed
    and dated form to Atlas stating that he was a current shareholder of Atlas, and had
    been so for nine years, and that he owned 52,689 shares. He sought to examine
    certain financial records of the company to “review and ascertain the value of [his]
    shares and the financial status of the company.” Aplt.’s App., Vol. II, at 265.
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    and the court concluded that the doctrine did not apply here because the claim would
    affect Atlas’s rights as a third party. 
    Id.
     (quoting Mortg. Invs. Corp. v. Battle
    Mountain Corp. (Mortg. Invs. II), 
    93 P.3d 557
    , 560 (Colo. Ct. App. 2003)).
    Therefore, the district court granted summary judgment on Atlas’s declaratory
    judgment claim that the stock transfer was void.
    On September 18, 2020, upon a stipulated motion by the parties, the district
    court certified its order as final pursuant to Fed. R. Civ. P. 54(b) and entered a final
    judgment pursuant to Fed. R. Civ. P. 54(b) on the declaratory judgment claim. See
    Aplt.’s App., Vol. III, at 153–55 (order on certification of finality); 
    id. at 156
     (Final
    Judgment). And, following the grant of an extension on the Fed. R. Civ. P. Rule 4
    appeal deadline, Biowest filed its Notice of Appeal. See 
    id.
     at 157–64 (motion for
    extension); see also 
    id.
     at 169–71 (Corrected Notice of Appeal).
    Notably, a few days after the court certified its order in the instant case as
    final, the district court in Atlas I entered judgment “in favor of Atlas [] on its claims
    for federal trademark infringement; Colorado common law trademark and trade name
    infringement; misappropriation of trade secrets; and breach of fiduciary duty.” Atlas
    I, 
    2019 WL 4594274
    , at *23. Specifically, the district court ordered “that a final
    judgment shall be entered against Defendants Thomas James Kutrubes, Peak Serum,
    Inc., and Peak Serum, LLC in the amount of $2,048,180.50.” 4 
    Id.
     And Mr. Kutrubes
    4
    At oral argument, we questioned the parties about how the outcome of
    Mr. Kutrubes’s appeal would affect the supplemental enforcement jurisdiction of the
    district court at issue in this appeal. Both parties seemed to agree that if the panel in
    Atlas I reversed the district court’s judgment in its entirety, such that there would be
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    and his companies appealed. See Atlas I, No. 19-1404, 
    2022 WL 2840484
     (10th Cir.
    July 21, 2022) (unpublished). In a recently issued unpublished decision, a panel of
    our court affirmed the district court’s judgment. 
    Id. at *1, *9
    .
    II
    This appeal presents three issues. First, we must decide whether the district
    court properly extended supplemental ancillary jurisdiction to the proceedings
    initiated by Atlas. Second, we must determine whether Atlas had standing to sue
    Biowest even though Biowest was not a party in the original litigation. Because we
    answer both of these inquires in the affirmative, we last turn to the underlying merits
    of this suit—whether the stock transfer between Mr. Kutrubes and Biowest was
    consonant with Colorado law. We conclude it was not; it is therefore void.
    Therefore, we affirm the district court’s grant of summary judgment in favor of
    Atlas.
    A
    We first turn to whether the district court had subject-matter jurisdiction to
    hear this case. We begin by outlining what is required for federal courts to have
    jurisdiction and sketch the contours of when courts may possess supplemental
    no judgment against Mr. Kutrubes, this case would be moot and there would be no
    ancillary enforcement jurisdiction. But, as noted, that did not happen. The panel
    who heard Mr. Kutrubes’s appeal affirmed the district court’s judgment. See Atlas I,
    No. 19-1404, 
    2022 WL 2840484
    , at *1,*9 (10th Cir. July 21, 2022) (unpublished).
    Therefore, because there remains an outstanding judgment against Mr. Kutrubes, this
    case is not moot and, as will be discussed below, the district court properly exercised
    ancillary enforcement jurisdiction over Atlas’s claim in this case.
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    jurisdiction over claims that traditionally fall outside the ambit of federal jurisdiction.
    This will be followed by further discussion of the species of supplemental
    jurisdiction that we have before us: ancillary enforcement jurisdiction. Next, we will
    conclude that this case was indeed within the district court’s ancillary enforcement
    jurisdiction. And finally, we will consider Biowest’s arguments to the contrary.
    1
    “Federal courts are courts of limited jurisdiction. They possess only that
    power authorized by Constitution and statute . . . which is not to be expanded by
    judicial decree.” Kokkonen, 
    511 U.S. at 377
     (citations omitted); see Owen Equip. &
    Erection Co. v. Kroger, 
    437 U.S. 365
    , 374 (1978) (“It is a fundamental precept that
    federal courts are courts of limited jurisdiction. The limits upon federal jurisdiction,
    whether imposed by the Constitution or by Congress, must be neither disregarded nor
    evaded.”). Accordingly, “[i]t is to be presumed that a cause lies outside this limited
    jurisdiction . . . and the burden of establishing the contrary rests upon the party
    asserting jurisdiction.” Kokkonen, 
    511 U.S. at 377
     (citation omitted); see also
    McNutt v. Gen. Motors Acceptance Corp. of Indiana, 
    298 U.S. 178
    , 182 (1936) (“It is
    incumbent upon the plaintiff properly to allege the jurisdictional facts, according to
    the nature of the case.”); 
    id. at 189
     (“[The plaintiff] must allege in his pleading the
    facts essential to show jurisdiction.”).
    “But sometimes the federal courts are permitted to entertain a claim or
    an incidental proceeding that does not satisfy requirements of an independent basis
    of subject matter jurisdiction.” 13 Charles Alan Wright & Arthur R. Miller,
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    FEDERAL PRACTICE AND PROCEDURE § 3523.2 (3d ed.), Westlaw (database updated
    May 2022). This “supplemental jurisdiction” is most commonly used in the context
    of extending jurisdiction over non-federal question or non-diverse claims asserted in
    federal court. For example, “in any civil action of which the district courts have
    original jurisdiction,” § 1367 of Title 28 permits federal courts to exercise
    supplemental jurisdiction over certain claims that do not independently satisfy the
    requirements for subject-matter jurisdiction, stating the following: “the district courts
    shall have supplemental jurisdiction over all other claims that are so related to claims
    in the action within such original jurisdiction that they form part of the same case or
    controversy under Article III of the United States Constitution.” 
    28 U.S.C. § 1367
    (a).
    But there is another species of supplemental jurisdiction—ancillary or
    ancillary enforcement jurisdiction—that allows federal courts to extend jurisdiction
    over “related proceedings that are technically separate from the initial case that
    invoked federal subject matter jurisdiction.” 13 Wright & Miller, supra, § 3523.2.
    The Supreme Court explained “that a federal court may exercise ancillary jurisdiction
    ‘(1) to permit disposition by a single court of claims that are, in varying respects and
    degrees, factually interdependent; and (2) to enable a court to function successfully,
    that is, to manage its proceedings, vindicate its authority, and effectuate its
    decrees.’” Peacock v. Thomas, 
    516 U.S. 349
    , 354 (1996) (quoting Kokkonen, 
    511 U.S. at
    379–380).
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    2
    We focus on this second form of supplemental jurisdiction—ancillary
    enforcement jurisdiction. Because we have previously described ancillary
    enforcement jurisdiction as an “ill-defined concept,” we pause here to provide some
    clarity to an otherwise nebulous aspect of our federal courts’ jurisdiction. Sandlin v.
    Corp. Interiors Inc., 
    972 F.2d 1212
    , 1215 (10th Cir. 1992) (quoting 6 Charles Alan
    Wright & Arthur R. Miller, FEDERAL PRACTICE AND PROCEDURE § 1444 (2d ed.
    1990)). Not governed by 
    28 U.S.C. § 1367
    , ancillary enforcement jurisdiction is a
    creature of the common law and thus is governed by caselaw. See Boim v. Am.
    Muslims for Palestine, 
    9 F.4th 545
    , 551 (7th Cir. 2021) (“Congress codified much of
    the first category in the supplemental jurisdiction statute, 
    28 U.S.C. § 1367
    , while the
    latter category—at times called ‘ancillary enforcement jurisdiction’—remains
    grounded in federal common law.”); Butt v. United Brotherhood of Carpenters &
    Joiners of Am., 
    999 F.3d 882
    , 886–87 (3d Cir. 2021) (“Unlike the sources of
    jurisdiction conferred by 
    28 U.S.C. § 1367
    , ancillary enforcement jurisdiction
    focuses on ‘the power [of federal courts] to enforce their judgments and ensur[es]
    that they are not dependent on state courts to enforce their decrees.’” (alterations in
    original) (footnote omitted) (quoting Nat’l City Mortg. Co. v. Stephen, 
    647 F.3d 78
    ,
    85 (3d Cir. 2011))); Nat’l City Mortg. Co., 647 F.3d at 85 (“‘Ancillary enforcement
    jurisdiction is . . . a creature of necessity,’ . . . giving federal courts the power to
    enforce their judgments and ensuring that they are not dependent on state courts to
    enforce their decrees. Ancillary jurisdiction is a common law doctrine that survived
    16
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022      Page: 17
    the codification of supplemental jurisdiction in 
    28 U.S.C. § 1367
    .” (first omission in
    original) (citations omitted) (quoting Peacock, 
    516 U.S. at 359
    )).
    We have explained that “[a]ncillary jurisdiction rests on the premise that a
    federal court acquires jurisdiction of a case or controversy in its entirety.” Jenkins v.
    Weinshienk, 
    670 F.2d 915
    , 918 (10th Cir. 1982). In line with this proposition, we
    have explained that “a court may decide collateral matters necessary to render
    complete justice,” 
    id.,
     and “[w]ithin a federal court’s ancillary jurisdiction is the
    power to conduct proceedings necessary to protect and give effect to its judgments,”
    Sandlin, 
    972 F.2d at 1216
    . See Peacock, 
    516 U.S. at 354
     (explaining ancillary
    jurisdiction “enable[s] a court to function successfully, that is, to manage its
    proceedings, vindicate its authority, and effectuate its decrees” (quoting
    Kokkonen, 
    511 U.S. at
    379–80)); see also Loc. Loan Co. v. Hunt, 
    292 U.S. 234
    , 239
    (1934) (“That a federal court of equity has jurisdiction of a bill ancillary to an
    original case or proceeding in the same court, whether at law or in equity, to secure
    or preserve the fruits and advantages of a judgment or decree rendered therein, is
    well settled.”); 13 Wright & Miller, supra, § 3523.2 (explaining that a district court
    “may hear collateral proceedings when necessary to allow it to vindicate its role as a
    tribunal”). Therefore, “if a federal court had jurisdiction of the principal action, it
    may hear an ancillary proceeding, regardless of the citizenship of the parties, the
    amount in controversy, or any other factor that normally would determine subject
    matter jurisdiction.” 13 Wright & Miller, supra, § 3523.2.
    17
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 18
    But the matter of which ancillary proceedings fall within this form of
    supplemental jurisdiction is less clear. The Supreme Court has “approved the
    exercise of ancillary jurisdiction over a broad range of supplementary proceedings
    involving third parties to assist in the protection and enforcement of federal
    judgments—including attachment, mandamus, garnishment, and the prejudgment
    avoidance of fraudulent conveyances.” Peacock, 
    516 U.S. at 356
    . Thus, while it is
    “[w]ithout doubt [that] a federal court has jurisdiction to enjoin actions that threaten
    to interfere with an order it has entered,” 13 Wright & Miller, supra, § 3523.2, the
    Supreme Court nevertheless has outlined certain types of enforcement proceedings
    that do not fall within the ambit of supplemental ancillary jurisdiction. For example,
    in Kokkonen, the Supreme Court explained that ancillary jurisdiction does not extend
    to a breach of a settlement agreement that arose from a stipulation of dismissal under
    Federal Rule of Civil Procedure 41(a)(1)(ii), which did not reserve jurisdiction to the
    district court to enforce the agreement or even refer to the settlement agreement. 
    511 U.S. at
    376–78. The Court explained that “the power asked for here is quite remote
    from what courts require in order to perform their functions,” because “the terms of
    the settlement agreement had [not] been made part of the order of dismissal” and
    therefore, “the only order here was that the suit be dismissed, a disposition that is in
    no way flouted or imperiled by the alleged breach of the settlement agreement.” 
    Id.
    at 380–81.
    The Court recognized another boundary by holding that ancillary supplemental
    jurisdiction did not extend to enforcing a judgment for breach of fiduciary duties
    18
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022      Page: 19
    against a third party who was found by the district court not to be a fiduciary.
    Peacock, 
    516 U.S. at
    357–60. The Court explained that it has never recognized
    extending supplemental jurisdiction “beyond attempts to execute, or to guarantee
    eventual executability of, a federal judgment,” and it has “never authorized the
    exercise of ancillary jurisdiction in a subsequent lawsuit to impose an obligation to
    pay an existing federal judgment on a person not already liable for that judgment.”
    
    Id. at 357
     (emphasis added); see H.C. Cook Co. v. Beecher, 
    217 U.S. 497
    , 498–99
    (1910) (concluding that a plaintiff could not collect on the judgment by suing the
    individual directors of the defendant corporation, alleging that they had authorized
    and knowingly permitted the corporation to become insolvent, because the suit was
    not ancillary to the judgment in the former suit). Further, the Court “cautioned
    against the exercise of jurisdiction over proceedings that are “‘entirely new and
    original,’” or where ‘the relief [sought is] of a different kind or on a different
    principle’ than that of the prior decree.” Peacock, 
    516 U.S. at 358
     (alteration in
    original) (first quoting Krippendorf v. Hyde, 
    110 U.S. 276
    , 285 (1884); and then
    quoting Dugas v. Am. Sur. Co. of New York, 
    300 U.S. 414
    , 428 (1937)).
    Notably, in Ellis v. All Steel Construction, Inc., however, we made clear that
    the third-party boundary of “Peacock . . . is not implicated in actions to reach and
    collect assets of the judgment debtor held by a third party; it is only when the
    plaintiff seeks to hold the third party personally liable on the judgment that an
    independent jurisdictional basis is required.” 
    389 F.3d 1031
    , 1034 (10th Cir. 2004)
    (emphasis added). This distinction is evident from the fact that Peacock itself
    19
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 20
    explicitly recognized “the exercise of ancillary jurisdiction over a broad range of
    supplementary proceedings involving third parties to assist in the protection and
    enforcement of federal judgments—includ[ed] attachment, . . . and the prejudgment
    avoidance of fraudulent conveyances.” 
    516 U.S. at 356
     (emphasis added).
    Our sister circuits likewise have interpreted Peacock as not affecting the
    ability of federal courts to hear ancillary proceedings to enforce judgments against
    third parties. See Nat’l Mar. Servs., Inc. v. Straub, 
    776 F.3d 783
    , 787 (11th Cir.
    2015) (“In contrast with Peacock, the district court had ancillary jurisdiction over
    this supplementary proceeding because [plaintiff] sought to disgorge [defendant] of a
    fraudulently transferred asset, not to impose liability for a judgment on a third party.
    Unlike the defendant in Peacock, [defendant] is not personally liable for the
    judgment against [a separate defendant in the primary action] . . . [defendant in the
    supplemental action’s] liability is limited instead to the proceeds that [defendant in
    the primary action] fraudulently transferred to him.”); Epperson v. Ent. Express, Inc.,
    
    242 F.3d 100
    , 106–07 (2d Cir. 2001) (concluding that the district court had ancillary
    enforcement jurisdiction where one party only attempted to void the allegedly
    fraudulent conveyances of defendant to and among other defendant parties, in order
    to ensure the plaintiff’s collectability of the default judgment); Thomas, Head &
    Greisen Emps. Tr. v. Buster, 
    95 F.3d 1449
    , 1454–55 (9th Cir. 1996) (distinguishing
    plaintiffs’ fraudulent conveyance claims from the veil-piercing claim at issue in
    Peacock, and holding that a district court has enforcement jurisdiction over a
    judgment creditor’s fraudulent conveyance claims against transferees who were not
    20
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    parties to the underlying action); see also Gambone v. Lite Rock Drywall, 288 F.
    App’x 9, 12 (3d Cir. 2008) (unpublished) (“[A]ncillary jurisdiction lets prevailing
    litigants go to the District Court that entered their judgment for help in resolving
    matters related to its enforcement. Accordingly, so long as the plaintiffs’ demand for
    injunctive relief qualifies as a post-judgment enforcement proceeding, which is a
    proceeding that functions as a means for executing a judgement, the District Court
    has subject matter jurisdiction”).
    3
    We conclude that the district court had ancillary subject matter jurisdiction
    over Atlas’s declaratory judgment claim to void the stock transfer to Biowest. In
    Atlas I, the district court issued a writ of attachment, and concluded that “whatever
    Atlas [] stock that Defendant Thomas James Kutrubes owns is subject to attachment .
    . . ,” and commanded the Sheriff of Larimer County to “attach and safely keep any
    stock of Atlas [] owned by Defendant Thomas James Kutrubes.” Aplt.’s App., Vol.
    IV, at 92 (Writ of Attachment, filed Apr. 24, 2018). Atlas filed this suit, seeking
    declaratory relief, to “void the purported transfer of stock under Article 8 of the
    [CUCC] or, in the alternative, to avoid and recover a fraudulent transfer pursuant to
    the Colorado Uniform Fraudulent Conveyances Act . . . .” Aplt.’s App., Vol. II, at 4
    (Amended Complaint, filed Mar. 18, 2019). The district court concluded that it
    indeed had jurisdiction over “these three claims [because] Plaintiff seeks to avoid an
    allegedly fraudulent transfer of stock to Defendant Biowest, LLC from Defendant
    Kutrubes, against whom Plaintiff seeks a judgment in the Primary Suit [i.e., Atlas I].”
    21
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022     Page: 22
    Atlas II, 
    2019 WL 1200809
    , at *6. Specifically, it explained these claims are “within
    the scope of the ancillary enforcement jurisdiction of this Court.” 
    Id.
    The district court is correct. To be sure, the nature of this case is unique. But
    it nevertheless falls within the core of those situations under which ancillary
    enforcement jurisdiction appropriately extends to third parties. As mentioned above,
    we have concluded that “[w]ithin a federal court’s ancillary jurisdiction is the power
    to conduct proceedings necessary to protect and give effect to its judgments.”
    Sandlin, 
    972 F.2d at 1216
    . And we have made clear that ancillary enforcement
    jurisdiction is appropriate in actions “to reach and collect assets of the judgment
    debtor held by a third party.” Ellis, 
    389 F.3d at 1034
    ; cf. Peacock, 
    516 U.S. at 357
    (noting the Court has never recognized extending supplemental jurisdiction “beyond
    attempts to execute, or to guarantee eventual executability of, a federal judgment”).
    Most relevant here, the Supreme Court has approved of the exercise of
    supplemental jurisdiction over a claim to avoid a fraudulent transfer of assets to a
    third party. See Dewey v. W. Fairmont Gas Coal Co., 
    123 U.S. 329
    , 332–33 (1887)
    (concluding that the district court had ancillary jurisdiction over a suit brought under
    West Virginia law allowing “a creditor, before obtaining a judgment or decree for his
    claim, [to] institute any suit to avoid a gift, conveyance, assignment, or transfer . . .
    .”); cf. Riggs v. Johnson Cnty., 73 U.S. (6 Wall.) 166, 187 (1867) (“Process
    subsequent to judgment is as essential to jurisdiction as process antecedent to
    judgment, else the judicial power would be incomplete and entirely inadequate to the
    purposes for which it was conferred by the Constitution.”).
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    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022      Page: 23
    Although this case concerns the predicate issue of whether any sort of transfer
    actually occurred, deciding this question through a declaratory judgment is essential
    to the district court deciding the entire case before it. That is, whether the transfer to
    Biowest was effective under Colorado law determines whether the district court’s
    writ of attachment attached to anything at all. This is true even though Biowest is not
    mentioned in the writ of attachment ordered by the district court, because the relief
    sought by Atlas in this case against Biowest is necessarily tied to vindicating the
    relief already ordered in the principal action (i.e., Atlas I) against Mr. Kutrubes.
    Unlike in Peacock, the district court had ancillary jurisdiction over this
    proceeding because Atlas asked the district court to answer the question about the
    validity of the transfer and thus the writ of attachment—not to impose liability on a
    third party. See Epperson, 
    242 F.3d at 107
     (“In the present proceeding, Appellants
    seek only to void the allegedly fraudulent conveyances of [judgment debtor] to and
    among [third parties] in order to ensure the collect[a]bility of the default judgment
    against [judgment debtor]. Their fraudulent conveyance claims do not seek to hold
    [third parties] liable for the existing judgment . . . . Accordingly . . . Appellants’
    claims for fraudulent conveyance were within the scope of the enforcement
    jurisdiction of the district court.” (footnotes omitted)). Thus, in order to fully
    effectuate the district court’s order attaching “whatever Atlas [] stock that Defendant
    Thomas James Kutrubes owns,” the district court must determine the validity of any
    transfer to Biowest of the attached property under Colorado law and, relatedly,
    whether Atlas was obligated to register the shares purportedly transferred to Biowest.
    23
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022     Page: 24
    Therefore, this is the very sort of proceeding that would allow the district court to
    decide the entire case and assure that its judgments are followed—viz., the type of
    case that fits nicely and properly within the compass of ancillary enforcement
    jurisdiction.
    4
    Biowest’s arguments to the contrary are unavailing. First, Biowest argues that
    Atlas only invoked 
    28 U.S.C. § 1367
    ’s supplemental jurisdiction and did not allege
    common law ancillary jurisdiction. See Aplt.’s Opening Br. at 17–20. And, because
    it “was Atlas’s duty to assert the proper jurisdictional basis for its claims and it failed
    to assert common law ancillary jurisdiction,” the “District Court should not have
    considered that as a basis for its jurisdiction.” 
    Id. at 22
    . Biowest correctly observes
    that “[t]he burden of establishing subject matter jurisdiction is on the party asserting
    jurisdiction.” Aplt.’s Reply Br. at 1 (quoting Port City Props. v. Union Pac. R.R.
    Co., 
    518 F.3d 1186
    , 1189 (10th Cir. 2008)). Consequently, when a party
    championing subject-matter jurisdiction “fails to lead” in identifying the proper
    jurisdictional theory, “we have no duty to follow.” Raley v. Hyundai Motor Co., Ltd.,
    
    642 F.3d 1271
    , 1275 (10th Cir. 2011) (emphasis added). In other words, in such
    circumstances, a federal court is not obliged “to conjure up possible theories” to
    support subject-matter jurisdiction. Id.; see, e.g., Patrick G. by & through Stephanie
    G. v. Harrison Sch. Dist. No. 2, 
    40 F.4th 1186
    , 1214–15 (10th Cir. 2022) (“[The
    plaintiffs] make no meaningful argument—supported by authority or even logic—for
    why this claim is viable (i.e., not moot) . . . . At the end of the day, the [the
    24
    Appellate Case: 20-1401    Document: 010110751168         Date Filed: 10/11/2022      Page: 25
    plaintiffs] must convince us that jurisdiction is present, and we will not make
    arguments in this respect for them.”).
    That does not mean, however, that—when a party stumbles and falls in
    advancing the jurisdictional ball—federal courts lack the discretion to identify a valid
    theory to support their jurisdiction. More specifically, just as federal courts have the
    “discretion to decline to consider . . . arguments that might have supported”
    jurisdiction, where a jurisdictional proponent fails to properly advance them, it
    logically follows that they have the discretion to consider such jurisdiction-
    supportive arguments in a like situation. U.S. ex rel. Ramseyer v. Century
    Healthcare Corp., 
    90 F.3d 1514
    , 1518 n.2 (10th Cir. 1996), superseded by statute on
    other grounds, False Claims Act, 
    Pub. L. No. 111-203, 124
     Stat. 1376, as recognized
    in U.S. ex rel. Reed v. KeyPoint Gov’t Sols., 
    923 F.3d 729
    , 764–65 (10th Cir. 2019)
    (emphasis added); see Daigle v. Shell Oil Co., 
    972 F.2d 1527
    , 1539 (10th Cir. 1992)
    (“[W]e may depart from the general waiver rule [to consider arguments supportive of
    subject-matter jurisdiction] in our discretion, particularly when we are presented with
    a strictly legal question the proper resolution of which is beyond doubt or when
    manifest injustice would otherwise result.” (emphasis added)); cf. 13D Charles Alan
    Wright & Arthur R. Miller, FEDERAL PRACTICE AND PROCEDURE § 3567.3 (3d ed.),
    Westlaw (database updated April 2022) (“[R]efusing to exercise [supplemental]
    jurisdiction under [28 U.S.C.] § 1367(c) is a discretionary—and not a
    jurisdictional—decision.” (emphasis added)). Stated otherwise, where a federal
    court’s subject-matter jurisdiction is challenged, as here—while independently
    25
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022       Page: 26
    assessing whether there is a proper basis for jurisdiction—a federal court is not
    limited to the jurisdictional theories that the jurisdictional proponent advances. To
    the contrary, it has the discretion to identify a proper ground for subject-matter
    jurisdiction that the proponent did not identify. That is precisely the discretion that
    the district court exercised here, and we have no reason to think that the court abused
    its discretion.
    Furthermore, the authority identified by Biowest underscores that the burden
    shouldered by the party asserting jurisdiction is to properly plead—and, at the
    appropriate procedural juncture, actually produce evidence of—facts supporting
    federal jurisdiction. See, e.g., Port City Props., 
    518 F.3d at 1189
    . Here, although it
    appears to be uncontested that Atlas mistakenly pointed to 
    28 U.S.C. § 1367
     for the
    source of supplemental jurisdiction, Atlas nevertheless alleged sufficient facts to
    support ancillary common law jurisdiction—thereby, shouldering (at least in material
    respects) its jurisdictional burden. See Aplt.’s App., Vol. I, at 17–35 (Complaint,
    filed Apr. 25, 2018). Most relevant, Atlas pleaded that Mr. Kutrubes admitted that he
    knew that a judgment would be entered against him in the other case (i.e., Atlas I);
    Mr. Kutrubes purportedly then transferred his shares to Biowest; Atlas sought a writ
    of attachment against Mr. Kutrubes’s stock; and Atlas had not received valid
    instructions to register the shares. See Aplt.’s App., Vol. II, at 7–11, 13. In support
    of its allegations, Atlas filed multiple exhibits comprised of documents from the
    original case detailing the back and forth between the parties regarding the purported
    stock transfer to Biowest and filings regarding the writ of attachment. See 
    id.
     at 21–
    26
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022       Page: 27
    61; cf. Smith v. United States, 
    561 F.3d 1090
    , 1098 (10th Cir. 2009) (“In evaluating a
    Rule 12(b)(6) motion to dismiss, courts may consider not only the complaint itself,
    but also attached exhibits . . . and documents incorporated into the complaint by
    reference . . . .” (citations omitted)). Although Atlas inexplicably did not mention in
    its amended complaint that the writ of attachment was indeed granted, it provided
    sufficient facts to show that the district court had supplemental ancillary jurisdiction
    to hear its case.
    Next, Biowest argues that, although it “does not contest a federal district
    court’s equitable jurisdiction to enforce its orders and judgments,” Biowest “does
    contest the District Court’s assumption of ancillary subject matter jurisdiction over
    claims at law in a separate action.” Aplt.’s Opening Br. at 23; see Aplt.’s Reply Br.
    at 7 (arguing “equitable ancillary enforcement claims (including a properly plead
    CUFTA claim) cannot provide a jurisdictional basis for the declaratory judgment
    claim on the contract, also a claim at law rather than equity, even if considered
    together”). But Biowest points to no authority that shows that this distinction
    matters. Cf. Hunt, 
    292 U.S. at 239
     (“That a federal court of equity has jurisdiction of
    a bill ancillary to an original case or proceeding in the same court, whether at law or
    in equity, to secure or preserve the fruits and advantages of a judgment or decree
    rendered therein, is well settled.” (emphasis added)). And when considering
    ancillary enforcement jurisdiction’s purpose to enable courts to effectuate their
    orders, the law and equity distinction is seemingly inapposite; it is not consonant
    with comprehensively achieving the purpose of ancillary jurisdiction.
    27
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022       Page: 28
    In line with this, Biowest’s arguments that Atlas’s declaratory judgment is
    necessarily “new and original,” because it arises as a claim at law, fails. Aplt.’s
    Opening Br. at 25–26 (quoting Peacock, 
    516 U.S. at 358
    ). Specifically, in an attempt
    to argue that the declaratory judgment concerns a “new and original” claim, Biowest
    contends that “the Agreement and Assignment was executed and the Shares
    transferred prior to the entry of the Atlas One Writ which ran against only Atlas
    stock, if any, held by [Mr.] Kutrubes at the time of entry, and therefore did not cover
    the previously transferred Shares.” Id. at 24. But this attempt to show that the
    dispute is “new and original” actually frames how this dispute relates to the original
    case, and it simply papers over the question that the district court used its
    supplemental ancillary jurisdiction to decide: that is, whether there actually was a
    legally effective transfer of shares by Mr. Kutrubes in the first place and, by
    extension, whether any such transfer actually did occur prior to the issuance of the
    writ of attachment. The fact that the answer to this question—which relates to the
    utility of the writ of attachment issued in Atlas I to enforce the district court’s
    judgment in that case—requires looking to Colorado law does not make this a “new
    or original” suit, disconnected from Atlas I. Instead, this lawsuit is compatible with
    the general aim of ancillary jurisdiction to allow courts to decide an entire case
    without requiring litigants to start over in state court. Thus, Biowest cannot show
    that the nature of this case puts it outside of the proper bounds of a federal court’s
    supplemental jurisdiction. The district court correctly exercised subject-matter
    jurisdiction over Atlas’s declaratory judgment claim.
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    B
    Having determined that the district court properly extended supplemental
    ancillary enforcement jurisdiction to Atlas’s declaratory judgment claim, we next
    turn to whether Atlas had standing to sue Biowest. This question is necessarily
    interwoven with the supplemental ancillary enforcement jurisdictional inquiry. But
    to answer this question, we must untangle the state and federal threads that supply the
    basis of the district court’s federal jurisdiction and pinpoint the exact basis on which
    Atlas’s claim rests. To do this, we start by summarizing the relevant law of standing.
    Next, we will explain how federal standing law interacts with state standing law.
    Then, we will examine how standing works in the declaratory judgment context.
    Next, we will conclude that Atlas indeed had standing to sue Biowest. And finally,
    we will consider and dispose of Biowest’s sole argument in response to Atlas’s
    standing.
    1
    “Article III of the Constitution limits the jurisdiction of federal courts to
    ‘Cases’ and ‘Controversies.’” Susan B. Anthony List v. Driehaus, 
    573 U.S. 149
    , 157
    (2014) (quoting U.S. Const. art. III, § 2). The doctrine of standing works by
    “identify[ing] those disputes which are appropriately resolved through the judicial
    process,” and in doing so, assures that federal courts only hear cases consistent with
    the jurisdictional limits articulated in the Constitution. Id. (alteration in original)
    (quoting Lujan v. Defs. of Wildlife, 
    504 U.S. 555
    , 560 (1992)). Accordingly, the
    Supreme Court has described standing as “the irreducible constitutional minimum,”
    29
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022      Page: 30
    and “the core component of standing is an essential and unchanging part of the case-
    or-controversy requirement of Article III.” Lujan, 
    504 U.S. at 560
    .
    “To establish Article III standing, a plaintiff must show (1) an ‘injury in fact,’
    (2) a sufficient ‘causal connection between the injury and the conduct complained
    of,’ and (3) a ‘likel[ihood]’ that the injury ‘will be redressed by a favorable
    decision.’” Susan B. Anthony List, 573 U.S. at 157–58 (alteration in original)
    (quoting Lujan, 
    504 U.S. at
    560–61). As to the injury-in-fact requirement, we have
    explained, “[t]o satisfy the first of these three elements, a plaintiff must offer
    something more than the hypothetical possibility of injury. The alleged injury must
    be concrete, particularized, and actual or imminent.” Colorado Outfitters Ass’n v.
    Hickenlooper, 
    823 F.3d 537
    , 544 (10th Cir. 2016). And for the second element,
    “there must be a causal connection between the injury and the conduct complained
    of—the injury has to be ‘fairly . . . trace[able] to the challenged action of the
    defendant, and not . . . th[e] result [of] the independent action of some third party not
    before the court.’” Lujan, 
    504 U.S. at 560
     (alterations and omissions in original)
    (quoting Simon v. E. Ky. Welfare Rts. Org., 
    426 U.S. 26
    , 41–42 (1976)). Finally, as
    to the redressability prong, “it must be ‘likely,’ as opposed to merely ‘speculative,’
    that the injury will be ‘redressed by a favorable decision.’” Id. at 561 (quoting
    Simon, 
    426 U.S. at 38, 43
    ).
    “The party invoking federal jurisdiction bears the burden of establishing these
    elements.” 
    Id.
     And because “they are not mere pleading requirements but rather an
    indispensable part of the plaintiff’s case, each element must be supported in the same
    30
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 31
    way as any other matter on which the plaintiff bears the burden of proof, i.e., with the
    manner and degree of evidence required at the successive stages of the litigation.”
    
    Id.
    2
    With this broad sketch of what is required to have Article III standing in mind,
    we now turn to the wrinkle presented by this suit: the relationship between Article III
    standing and the state law of standing. As a leading treatise suggests “for the most
    part, there is no question. Standing in federal courts is a matter of federal law.” 13B
    Charles Alan Wright & Arthur R. Miller, FEDERAL PRACTICE AND PROCEDURE §
    3531.14 (3d ed.), Westlaw (database updated June 2022). But this axiom is not
    absolute and does not comprehensively answer the question regarding the source of
    law concerning standing in at least two circumstances where federal courts typically
    apply state substantive law: that is, under diversity jurisdiction, 
    28 U.S.C. § 1332
    ;
    and, as most relevant here, under supplemental jurisdiction.
    In particular, we and other courts have understood that the relevant state’s law
    of standing should be applied—in addition to federal standing law—in considering
    claims in such settings that are derived from state law. See City of Moore v.
    Atchison, Topeka, & Santa Fe Ry. Co., 
    699 F.2d 507
    , 511 (10th Cir. 1983) (“State
    law determines who has standing to challenge the constitutionality of a state statute
    on the ground that it violates a state constitution.”); St. Francis Reg’l Med. Ctr. v.
    Blue Cross & Blue Shield of Kansas, Inc., 
    49 F.3d 1460
    , 1465–66 (10th Cir. 1995)
    (concluding that a state claim before the court through supplemental jurisdiction
    31
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    requires examining “the threshold issue of standing” under state law); see also
    Westborough Mall, Inc. v. City of Cape Girardeau, Mo., 
    693 F.2d 733
    , 747–48 (8th
    Cir. 1982) (looking to “Missouri law . . . in order to [determine] standing” to bring a
    state law claim heard through supplemental jurisdiction); cf. Swanson v. Bixler, 
    750 F.2d 810
    , 813 (10th Cir. 1984) (“Whether a complainant is the real party in interest
    under state law is generally resolved by inquiring whether he or she
    has standing under state law.”); cf. also Williams v. Mayor & City Council of
    Baltimore, 
    289 U.S. 36
    , 47–48 (1933) (“We have assumed, without deciding, that the
    respondents, though without standing to invoke the protection of the Federal
    Constitution, will be heard to complain of a violation of the Constitution of the state.
    Their standing for that purpose, at least in the state courts, is a question of state
    practice.”); Time Warner Ent. Co., L.P. v. Everest Midwest Licensee, L.L.C., 
    381 F.3d 1039
    , 1044 (10th Cir. 2004) (“State law claims before a federal court on
    supplemental jurisdiction are governed by state law.” (footnote omitted)). “Federal
    concepts of standing developed to regulate enforcement of federal rights do not
    represent any independent interest of the federal courts that justifies disregarding
    state law in this context.” 13B Wright & Miller, supra, § 3531.14.
    However, although state standing rules must be met when courts consider state
    causes of action, “state rules that recognize standing need not be honored if Article
    III requirements are not met.” Id. (emphasis added); see Hutchinson v. Pfeil, 
    211 F.3d 515
    , 523 (10th Cir. 2000) (“‘Standing [under Article III] is, of course, a
    threshold issue in every case before a federal court,’ and diversity claims are no
    32
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 33
    exception. Thus, the jurisdictional deficiency discussed above in connection with the
    [federal claim] would be equally fatal to the proposed [state claim], which rests on
    the same speculative injury.” (first alteration in original) (citations omitted) (quoting
    Wolfe v. Gilmour Mfg. Co., 
    143 F.3d 1122
    , 1126 (8th Cir. 1998))). Therefore,
    because the relief sought by Atlas necessarily turns on a question of state law, we
    must be satisfied that Atlas had standing to bring its claim under both the standing
    doctrine of Colorado and Article III.
    Although “Colorado standing jurisprudence does not duplicate all the features
    of federal standing doctrine,” similar considerations underlie both Colorado and
    federal standing law. City of Greenwood Vill. v. Petitioners for Proposed City of
    Centennial, 
    3 P.3d 427
    , 436 n.7 (Colo. 2000); see also Maurer v. Young Life, 
    779 P.2d 1317
    , 1324 n.10 (Colo. 1989) (“Although the federal-court doctrine of standing
    has a different constitutional basis and is not co-extensive with [Colorado’s] standing
    inquiry . . . , we have previously relied on the standing decisions of the United States
    Supreme Court for guidance in construing standing principles generally applicable
    under both the federal and Colorado law of standing.” (citation omitted)). The
    Colorado Supreme Court has noted that “[i]n Colorado, parties to lawsuits benefit
    from a relatively broad definition of standing.” Ainscough v. Owens, 
    90 P.3d 851
    ,
    855 (Colo. 2004).
    Standing in Colorado requires satisfying two requirements. First, similar to
    federal standing, a plaintiff “must demonstrate that he or she will suffer an ‘injury in
    fact’ from the challenged action,” and “[i]njuries need not be economic in character;
    33
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022       Page: 34
    harm to intangible values can satisfy the injury-in-fact requirement.” City of
    Greenwood, 3 P.3d at 437. But unlike federal standing requirements, the Colorado
    Supreme Court has explained that “[o]ur standing doctrine does not require” “an
    injury that is both ‘concrete and particularized,’ on the one hand and ‘actual or
    imminent, not conjectural or hypothetical’ on the other.” Id. at 437 n.8. Second, a
    plaintiff must “demonstrate that the injury he or she has suffered is to a legally
    protected right.” Id. at 437. “This is a question of whether the plaintiff has a claim
    for relief under the constitution, the common law, a statute, or a rule or regulation.”
    Ainscough, 90 P.3d at 856. “A legally protected interest may be tangible or economic
    such as ‘one of property, one arising out of contract, one protected against tortious
    invasions, or one founded on a statute which confers a privilege.’” Id.
    (quoting Wimberly v. Ettenberg, 
    570 P.2d 535
    , 537 (Colo. 1977)). And it
    “encompass[es] all rights arising from constitutions, statutes, and case law.” 
    Id.
    “These two considerations provide the framework for determining whether the
    asserted legal basis for a claim—whether constitutional, statutory, or otherwise—can
    properly be understood as granting [the plaintiff] a right to judicial relief” under
    Colorado law. Bd. of Cnty. Comm’rs, La Plata Cnty. v. Bowen/Edwards Assocs.,
    Inc., 
    830 P.2d 1045
    , 1052–53 (Colo. 1992) (alteration in original) (quoting O’Bryant
    v. Pub. Utilities Comm’n, 
    778 P.2d 648
    , 652 (Colo.1989)). Nevertheless, it is
    important to be aware of the Colorado Supreme Court’s admonition that “[a]lthough
    necessary, the test in Colorado has traditionally been relatively easy to satisfy.”
    Ainscough, 90 P.3d at 856.
    34
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    3
    Under federal and Colorado law, standing must be assessed in the context of
    the claim the plaintiff seeks to bring. The sole claim before us is Atlas’s declaratory
    judgment claim. The federal declaratory judgment statute alone does not provide
    jurisdiction, and, therefore in assessing whether Atlas has standing, we must look to
    the nature of the dispute and to the “character of the threatened action.” Medtronic,
    Inc. v. Mirowski Fam. Ventures, LLC, 
    571 U.S. 191
    , 197 (2014) (quoting Pub. Serv.
    Comm’n of Utah v. Wycoff Co., 
    344 U.S. 237
    , 248 (1952)). Similarly, the Colorado
    Declaratory Judgment Act creates no rights and is solely remedial. See Romer v.
    Fountain Sanitation Dist., 
    898 P.2d 37
    , 41 (Colo. 1995) (“C.R.C.P. 57 establishes
    the procedural mechanism for implementation of the Declaratory Judgment Act.
    C.R.C.P. 57(k) expressly provides that the rule is remedial. The rule neither
    expressly nor by implication expands the interests of parties, governmental or
    private, who seek the benefits of the remedy established thereby.”). Consequently,
    like the federal inquiry, in assessing standing under state law in the declaratory
    judgment context, we look to the nature of the underlying dispute. 5
    5
    The record reflects some confusion concerning whether the federal
    declaratory judgment statute, see 
    28 U.S.C. § 2201
    (a)—as opposed to Colorado’s
    declaratory judgment statute, see 
    Colo. Rev. Stat. § 13-51-105
    —supplies the proper
    statutory framework for the consideration of Atlas’s claim for relief. Atlas’s
    complaint states that “[t]his lawsuit is an action for declaratory relief pursuant [to]
    Fed. R. Civ. P. 57 . . . .” Aplt.’s App., Vol. II, at 4. Rule 57 says that its “rules
    govern the procedure for obtaining a declaratory judgment” under the federal statute,
    
    28 U.S.C. § 2201
    . Fed. R. Civ. P. 57. However, notably, the district court explained
    that “[t]his claim is apparently brought under Colorado’s Uniform Declaratory
    Judgments Law, 
    Colo. Rev. Stat. §§ 13-51-101
    , et seq., and Colorado Rule of Civil
    35
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022     Page: 36
    Procedure 57.” Atlas II, 
    2019 WL 1200809
    , at *7. And the district court further
    noted that “[a]s the Biowest Defendants concede, Plaintiff’s First Claim is
    necessarily a state claim ‘since federal ancillary jurisdiction is cited in the Complaint
    by the Plaintiff as the only basis for this Court’s jurisdiction over Plaintiff’s claims.’”
    
    Id.
     at *7 n.7. Biowest nevertheless states that the federal declaratory judgment
    standard should govern. Aplt.’s Opening Br. at 28–29; see Aplt.’s Reply. Br. at 10–
    12. Atlas, on the other hand, argues that the Colorado declaratory judgment standard
    should apply. See Aplee.’s Resp. Br. at 33. Ultimately, dispelling this apparent
    confusion is not material to our resolution of this appeal. In particular, this minor
    imbroglio has no impact on the federal jurisdictional questions before us.
    As we have discussed, supra, the district court acted in this case with federal
    subject matter jurisdiction—admittedly, jurisdiction of a somewhat unique type, that
    is, ancillary enforcement jurisdiction, which does not depend on the presence of an
    independent basis for federal jurisdiction in the instant lawsuit and, in fact, may
    involve, as here, entirely state substantive law. Furthermore, as for the standing
    question, the federal and Colorado declaratory judgment statutes, as suggested supra,
    are both strictly procedural—that is, without inherent substantive dimensions. See,
    e.g., Aetna Life Ins. Co. of Hartford, Conn. v. Haworth, 
    300 U.S. 227
    , 240 (1937)
    (noting that “the operation of the Declaratory Judgment Act is procedural only”);
    Medtronic, Inc., 571 U.S. at 199 (“We have long considered ‘the operation of the
    Declaratory Judgment Act’ to be only ‘procedural.’” (quoting Aetna Life, 
    300 U.S. at 240
    )); Romer, 898 P.2d at 41. Therefore, irrespective of whether the federal or
    Colorado declaratory judgment statute was the operative one, our focus in the
    standing inquiry would be the same: that is, the substantive dispute underlying the
    declaratory judgment action. In other words, in all events, our focus would remain
    on determining whether Atlas had standing to litigate its substantive state law claims
    under the standing requirements of Colorado and federal law.
    All that said, we observe that because the declaratory judgment statutes are
    strictly procedural, a reasonable argument could be made that Atlas was right to
    reference (albeit indirectly) the federal declaratory judgment statute as the applicable
    one. That is because in an analogous context, where federal courts apply state law,
    the Supreme Court explained that “[u]nder the Erie doctrine, federal courts sitting in
    diversity apply state substantive law and federal procedural law.” Gasperini v. Ctr.
    for Humans., Inc., 
    518 U.S. 415
    , 427 (1996); see Utica Lloyd’s of Texas v. Mitchell,
    
    138 F.3d 208
     (5th Cir. 1998) (concluding that a party could not rely on Texas’s
    declaratory judgment act to authorize attorney’s fees in a diversity case because the
    statute is not substantive law). However, because the resolution of this question
    regarding the operative declaratory judgment statute is not ultimately material to our
    resolution of this appeal, we need not (and thus do not) definitively opine on the
    matter.
    36
    Appellate Case: 20-1401     Document: 010110751168          Date Filed: 10/11/2022   Page: 37
    a
    In the declaratory judgment context, the Colorado Supreme Court has
    explained that “[w]hat is required for purposes of satisfying the standing requirement
    is that the plaintiff demonstrate that there is an existing legal controversy that can be
    effectively resolved by a declaratory judgment, and not a mere possibility of a future
    legal dispute over some issue.” Bd. of Cnty. Comm’rs, 830 P.2d at 1053. At least in
    the context of challenging a regulatory scheme, the court has explained that “[t]he
    injury-in-fact element of standing is established when the allegations of the
    complaint, along with any other evidence submitted on the issue of standing,
    establishes that the regulatory scheme threatens to cause injury to the plaintiff’s
    present or imminent activities.” Id. (emphasis added). And, for the legally protected
    interest, the court explained that “[a]n affirmative answer to this question,” “whether
    the plaintiff’s interest emanates from a constitutional, statutory, or judicially created
    rule of law that entitles the plaintiff to some form of judicial relief,” in the
    declaratory judgment context, means “simply that the party seeking judicial relief has
    stated a claim by demonstrating the existence of a legal right or interest which has
    been arguably violated by the conduct of the other party.” Id. (quoting
    O’Bryant, 778 P.2d at 653).
    Under these principles, we conclude that Atlas has standing under Colorado
    law. First, if the stock transfer between Mr. Kutrubes and Biowest is valid, this
    would threaten to cause injury to Atlas. As will be discussed further below, the
    legally effective transfer of the shares to Biowest would hinder Atlas’s ability as a
    37
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022     Page: 38
    judgment creditor to collect on its Atlas I judgment, and also the transfer could
    possibly open Atlas, as the stock issuer, to liability for not properly registering the
    transfer. As to the second prong, Atlas has a legally protected interest in determining
    whether the transfer was valid because, at the very least, Atlas has a statutory interest
    under Colorado law in determining whether it has a duty to register the share transfer.
    Therefore, Atlas has standing to sue under Colorado law.
    b
    The federal declaratory judgment statute provides that as to “a case of actual
    controversy within its jurisdiction, . . . , any court of the United States, upon the
    filing of an appropriate pleading, may declare the rights and other legal relations of
    any interested party seeking such declaration, whether or not further relief is or could
    be sought.” 
    28 U.S.C. § 2201
    (a). Put another way, “federal courts can issue
    declaratory judgments if there is an actual dispute between adverse litigants and if
    there is a substantial likelihood that the favorable federal court decision will bring
    about some change.” Erwin Chemerinsky, CONSTITUTIONAL LAW: PRINCIPLES AND
    POLICIES (2011); 
    id.
     (“[D]eclaratory judgments exist so that people can know their
    rights in advance.”). 6
    The Supreme Court has made clear that “an appropriate action for declaratory
    relief can be a case or controversy under Article III.” MedImmune, Inc. v.
    6
    “The Declaratory Judgment Act provides that a court ‘may declare the
    rights and other legal relations of any interested party,’ 
    28 U.S.C. § 2201
    (a)
    (emphasis added), not that it must do so.” MedImmune, Inc. v. Genentech, Inc., 
    549 U.S. 118
    , 136 (2007) (second emphasis added). “This text has long been understood
    38
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 39
    Genentech, Inc., 
    549 U.S. 118
    , 126 (2007) (citing Nashville, C. & St. L. Ry. v.
    Wallace, 
    288 U.S. 249
     (1933)). Although predating the modern standing
    formulation, the Supreme Court in Aetna Life Insurance Co. of Hartford, Connecticut
    v. Haworth, 
    300 U.S. 227
     (1937), generally explained what type of cases are
    appropriately within a federal court’s declaratory judgment power. Specifically, the
    Court made clear that “[w]here there is such a concrete case admitting of an
    immediate and definitive determination of the legal rights of the parties in an
    adversary proceeding upon the facts alleged, the judicial function may be
    appropriately exercised[,] although the adjudication of the rights of the litigants may
    not require the award of process or the payment of damages.” 
    Id. at 241
    .
    More recently, although recognizing that “Aetna and the cases following it do
    not draw the brightest of lines between those declaratory-judgment actions that
    satisfy the case-or-controversy requirement and those that do not,” the Court
    explained, “[o]ur decisions have required that the dispute be ‘definite and concrete,
    touching the legal relations of parties having adverse legal interests’; and that it be
    ‘real and substantial’ and ‘admi[t] of specific relief through a decree of a conclusive
    ‘to confer on federal courts unique and substantial discretion in deciding whether to
    declare the rights of litigants.’” 
    Id.
     (quoting Wilton v. Seven Falls Co., 
    515 U.S. 277
    ,
    286 (1995)); accord Cardinal Chem. Co. v. Morton Int’l, Inc., 
    508 U.S. 83
    , 95 n.17
    (1993); Brillhart v. Excess Ins. Co. of Am., 
    316 U.S. 491
    , 494–496 (1942). The
    Supreme Court has explained that it is “‘consistent with the statute,’ . . . ‘to vest
    district courts with discretion in the first instance, because facts bearing on the
    usefulness of the declaratory judgment remedy, and the fitness of the case for
    resolution, are peculiarly within their grasp.’” MedImmune, 
    549 U.S. at 136
     (quoting
    Wilton, 
    515 U.S. at 289
    ).
    39
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 40
    character, as distinguished from an opinion advising what the law would be upon a
    hypothetical state of facts.’” MedImmune, 
    549 U.S. at 127
     (second alteration in
    original) (quoting Aetna Life, 
    300 U.S. at
    240–41); see 
    id.
     (“Basically, the question in
    each case is whether the facts alleged, under all the circumstances, show that there is
    a substantial controversy, between parties having adverse legal interests, of sufficient
    immediacy and reality to warrant the issuance of a declaratory judgment.” (quoting
    Maryland Cas. Co. v. Pac. Coal & Oil Co., 
    312 U.S. 270
    , 273 (1941))).
    Applying the declaratory judgment “case and controversy” requirements to the
    Supreme Court’s teachings on standing, we turn to whether Atlas has sufficiently
    alleged it has suffered a sufficient injury-in-fact. Biowest argues there was no
    standing because “Atlas was not a party to the Stock Sales Agreement and
    Assignment between [Mr.] Kutrubes and Biowest . . . and therefore does not have an
    interest in the contract nor standing to bring the claim.” Aplt.’s Opening Br. at 28–
    29 (citation omitted).
    Although Atlas makes clear in its first amended complaint that it seeks
    declaratory judgment to answer the question of whether the transfer of Mr.
    Kutrubes’s shares in Atlas to Biowest is void and of no effect, Aplt.’s App., Vol. II,
    at 16–17, its pleadings are admittedly less clear on what would be the exact injury
    suffered by Atlas if the transfer was not voided. It alludes to the fact it “has not
    received valid instructions to register the purported transfer of [Mr.] Kutrubes’[s]
    Atlas stock to Biowest,” id. at 13, and the transfer, therefore, is “void because it was
    never completed as provided under Article 8 of the [CUCC],” id. at 16. Touching on
    40
    Appellate Case: 20-1401     Document: 010110751168          Date Filed: 10/11/2022     Page: 41
    the question of injury in a somewhat clearer fashion in the same pleading, Atlas does
    aver that the “[t]ransfer, if completed and not avoided, would render [Mr.] Kutrubes
    insolvent,” and because Mr. Kutrubes “admitted and acknowledged that he would
    become liable in damages to Atlas in [Atlas I],” presumably Atlas would have greater
    difficulty collecting on that judgment than it otherwise would have because Mr.
    Kutrubes would be impoverished following the effective transfer of shares to
    Biowest. Id. at 18. However, to the extent that Atlas’s amended complaint is
    somewhat vague about its purported injury, it is not fatally so. We have explained
    that “[a]t the pleading stage, general factual allegations of injury resulting from the
    defendant’s conduct may suffice.” Kansas Nat. Res. Coal. v. United States Dep’t of
    Interior, 
    971 F.3d 1222
    , 1231 (10th Cir. 2020) (quoting Lujan, 
    504 U.S. at 561
    ).
    And Atlas’s briefing clarifies the exact nature of its injury.
    Specifically, substantially tracking the injuries that the district court identified,
    see Atlas II, 
    2019 WL 1200809
    , at *8, Atlas first explains that “[r]esolving whether
    the writ attached [to] the stock or not is related to Atlas’s interests under the writ of
    attachment” and this would require determining “if the stock was transferred, and to
    do that, the court had to decide the declaratory judgment issue.” Aplee.’s Resp. Br.
    at 34, 36. Atlas also points out that “[e]ven a contingent liability qualifies as an
    actual, imminent, and concrete injury sufficient to trigger standing to bring a
    declaratory judgment action.” 
    Id. at 37
    . Next, Atlas argues that it has an interest as
    the issuer of the stock under Article 8 of the CUCC, and it has a duty to register a
    transfer “only if certain pre-conditions are met.” 
    Id. at 38
    . So not only would a
    41
    Appellate Case: 20-1401     Document: 010110751168          Date Filed: 10/11/2022     Page: 42
    declaratory judgment determine whether such conditions have been met, it would
    also relieve Atlas of “conflicting demands placed upon it: compliance with court
    orders and enforcement of the writ of attachment on the one hand, and threats from
    Biowest to litigate on the other.” 
    Id.
    We conclude that Atlas has made a sufficient showing of a cognizable injury.
    Especially with the result of the trial in Atlas I, Atlas has an interest to know whether
    the transfer was legally effective and, as a result, whether the shares could be used to
    satisfy the Atlas I judgment if they remain possessed by Mr. Kutrubes. That is, if Mr.
    Kutrubes validly transferred his shares to Biowest, then Atlas’s ability to collect on
    its judgment in Atlas I against Mr. Kutrubes is significantly impaired. And similarly,
    Atlas has a particularized and specific interest in knowing whether it was required to
    follow the district court’s writ of attachment to turn over the shares to Laramie
    County Sheriff, or if on the other hand, it was required to record the transfer to
    Biowest who, thus, would have control of the shares in question.
    In a roughly analogous context, we have concluded that an insurer could
    pursue a declaratory judgment claim against another insurer to determine their
    relative liability for an insurance claim, because the insurer was “not seeking to
    enforce rights as an insured under the [other insurer’s] policy; it is suing . . . insurer-
    to-insurer. [The insurer] seeks a judicial determination of how its policy interacts
    with the [the other insurer’s] policy.” Philadelphia Indem. Ins. Co. v. Lexington Ins.
    Co., 
    845 F.3d 1330
    , 1335 (10th Cir. 2017). And we explained that there was
    standing because “this action is not one to enforce a contract but rather seeks a
    42
    Appellate Case: 20-1401     Document: 010110751168         Date Filed: 10/11/2022       Page: 43
    declaration of the relative rights and duties of [the insurers].” 
    Id. at 1336
     (alteration
    in original) (quoting United Servs. Auto. Ass’n v. Royal-Globe Ins. Co., 
    511 F.2d 1094
    , 1096 (10th Cir. 1975)). As we explain further below, the standing
    determination of Philadelphia Indemnity belies the notion that Biowest advances—
    that is, the idea that just because Atlas has no direct interest in the contractual
    arrangement between Mr. Kutrubes and Biowest for the share transfer, that it lacks
    standing to seek a declaration regarding its relative rights regarding this arrangement.
    It is true that Atlas’s interest in determining whether the share transfer was
    valid has not yet resulted in an injury. However, we do not deem this to be a material
    impediment to a plaintiff possessing Article III standing. We “have recognized that
    contingent liability may present an injury in fact.” Protocols, LLC v. Leavitt, 
    549 F.3d 1294
    , 1299 (10th Cir. 2008); see 
    id. at 1300
     (noting that the Supreme Court
    found New York had standing to challenge the line-item veto because the President’s
    veto “reviv[ed] . . . a substantial contingent liability [which] immediately and directly
    affects the borrowing power, financial strength, and fiscal planning of the [plaintiff]”
    (quoting Clinton v. City of New York, 
    524 U.S. 417
    , 431 (1998))).
    Most relevant here was our discussion in Protocols of the Supreme Court’s
    decision in Aetna Life. We highlighted that the Supreme Court has acknowledged
    that a contingent liability can be a basis for Article III standing in the declaratory
    judgment context. See id. at 1300. We observed that the Court had found that the
    complaint “presented a controversy because the parties ‘had taken adverse positions
    with respect to their existing obligations,’” and a declaratory judgment could
    43
    Appellate Case: 20-1401     Document: 010110751168          Date Filed: 10/11/2022     Page: 44
    “‘definitely and finally adjudicate[ ]’ the rights of the parties.” Id. (alteration in
    original) (quoting Aetna Life, 
    300 U.S. at
    242–43). Accordingly, we reasoned that
    “[b]y holding that Aetna’s contingent liability presented a ‘controversy’ under Article
    III, the Court necessarily held that standing can be predicated on such liability.” 
    Id.
    Similar reasoning leads us to conclude that a declaratory judgment to avoid
    contingent liability would provide the basis here for Article III standing. The
    contingent liability that Atlas seeks to avoid by having the stock transfer declared
    void through a declaratory judgment action “has created an actual and imminent
    injury.” Id. at 1301. Therefore, Atlas satisfies the injury-in-fact element of standing.
    4
    Significantly, Biowest only contests that element—i.e., injury-in-fact. That is
    likely wise. We independently discern with little difficulty no obstacle to standing
    stemming from the other elements. 7 So, we center our remaining discussion on
    explaining why Biowest’s injury-in-fact challenge is without merit.
    7
    Of course, even absent a specific challenge from Biowest, we must
    independently ensure that the other elements of standing as to Atlas are satisfied.
    And they are. The second element requires that “there must be a causal connection
    between the injury and the conduct complained of—the injury has to be ‘fairly . . .
    trace[able] to the challenged action of the defendant, and not . . . th[e] result [of] the
    independent action of some third party not before the court.’” Lujan, 
    504 U.S. at 560
    (alterations and omissions in original) (quoting Simon, 
    426 U.S. at
    41–42). We
    previously determined in Philadelphia that where two insurers disputed “their
    relative responsibilities to pay for [a] loss” from a fire that there was a sufficient
    causal relation in the sought-after declaratory relief because their “interests are
    adverse . . . . One insurer or the other will bear the loss or they will share it in some
    manner.” 845 F.3d at 1332, 1335. This is similar to this case because Atlas and
    Biowest’s interest are adverse to one another—that is, determining the validity of the
    44
    Appellate Case: 20-1401     Document: 010110751168        Date Filed: 10/11/2022     Page: 45
    Biowest argues here, as it did in the district court, that Atlas does not have
    standing because it was not a party to the contract and, therefore, has no legally
    enforceable right. See Aplt.’s Opening Br. at 28–29; Aplt.’s Reply Br. at 9 (“Under
    Colorado law, a non-party or beneficiary to a contract lacks sufficient privity of
    contract and interest to assert a claim on the contract.”); id. at 11 (“Atlas was not a
    party to the Stock Sales Agreement and Assignment between [Mr.] Kutrubes and
    Biowest . . . and therefore does not have an interest in the contract nor standing to
    bring the claim.” (citation omitted)). But these statements reflect a fundamental
    misunderstanding of what this case is about. Atlas does not claim to be a party or
    beneficiary to the contract. Instead, Atlas seeks to determine whether the transfer at
    the core of the contract was valid. The answer to this question determines who
    transfer will necessarily result in one of them being injured. Therefore, Atlas has
    satisfied the traceability prong.
    Furthermore, as to the redressability prong, “it must be ‘likely,’ as opposed to
    merely ‘speculative,’ that the injury will be ‘redressed by a favorable decision.’”
    Lujan, 504 U.S at 561 (quoting Simon, 
    426 U.S. at 38, 43
    ). Again, Philadelphia
    provides guidance. There, we concluded that “[b]ecause Philadelphia’s injury is
    causally connected to how its policy interacts with [the other insurer’s] policy, a
    judicial determination of the insurers’ respective responsibilities under the policies
    will redress and resolve this dispute.” Philadelphia, 845 F.3d at 1335. Here, this
    prong is satisfied because if the transfer is found to be valid, then Atlas must
    certificate the shares and register the transfer; whereas, if the transfer is void, Atlas
    has no duty to register the transfer and instead may satisfy its Atlas I judgment
    against Mr. Kutrubes (at least in part) through reclaiming the shares.
    Therefore, because Atlas meets the three requirements, Atlas has standing to
    bring this declaratory judgment claim to have the district court determine the
    respective legal rights of both parties in relation to the share transfer.
    45
    Appellate Case: 20-1401      Document: 010110751168       Date Filed: 10/11/2022     Page: 46
    exactly owns Mr. Kutrubes’s shares and thus whether the writ of attachment actually
    attached to anything. And it also will decide whether the transfer, if valid, required
    Atlas to register the transfer of the shares. Therefore, Atlas does not seek the direct
    benefit of the contract; rather, it seeks to determine whether the contract is valid and
    affects its rights.
    We have concluded, in the declaratory judgment context, that a plaintiff that is
    neither a party to, nor third-party beneficiary of, a defendant’s contract nevertheless
    has standing to seek a declaratory judgment regarding the contract. In this regard,
    recall that, in Philadelphia, we determined that one insurance company had standing
    to sue even though it was not a party to or third-party beneficiary of the disputed
    contract because “[i]ts alleged injury is financial, definite, and concrete” and its
    “interests [were] adverse” to the opposing party where “[o]ne insurer or the other
    [would] bear the loss or they [would] share it in some manner.” 845 F.3d at 1335.
    As discussed above, the validity of the contract directly affects Atlas’s rights, and,
    therefore, Biowest’s argument that Atlas may not challenge the validity of a contract
    that it was not party to is unavailing.
    ***
    Therefore, we conclude that Atlas has standing to bring this declaratory
    judgment claim to have the district court determine the respective legal rights of both
    parties in relation to the share transfer.
    46
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    C
    We next turn to the merits of this case and thus whether the transfer between
    Mr. Kutrubes and Biowest was valid under Colorado law. We begin by first detailing
    what Colorado law requires for a stock transfer to be valid. We next turn to the
    merits of the district court’s decision. And finally, we consider three of Biowest’s
    arguments that the district court erred in concluding that the transfer was invalid.
    1
    The Colorado Supreme Court has made clear that “[t]itle to corporate stock in
    Colorado can only be transferred as provided by statute.” Quandary Land Dev. Co.
    v. Porter, 
    408 P.2d 978
    , 981 (Colo. 1965). It further explained that “[t]he statutory
    methods are exclusive and any attempt or desire to convey stock by other means
    merely results in a naked promise to transfer ownership in the future.” Id.; see
    Mortg. Invs. II, 93 P.3d at 560 (affirming trial court’s conclusion that individual who
    purportedly purchased shares of the defendant corporation but failed to obtain stock
    certificates “did not acquire ownership” of the property because he “did not comply
    with Article 8”).
    Article 8 of the CUCC governs the transfer of shares in a corporation. See
    
    Colo. Rev. Stat. §§ 4-8-101
    , et seq.; see also Mortg. Invs. Corp. v. Battle Mountain
    Corp. (Mortg. Invs. I), 
    70 P.3d 1176
    , 1187 (Colo. 2003) (concluding that Article 8
    “governs acquisition of legal ownership of certificated shares of a corporation and
    generally requires that a purchaser receive the security certificate or certified stock of
    the corporation”). Most relevant here, “[a] person acquires a security or an interest
    47
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    therein, under this article, if . . . [t]he person is a purchaser to whom a security is
    delivered pursuant to section 4-8-301.” 8 § 4-8-104(a)(1) (emphasis added). The
    Comment to § 4-8-301 explains that “[d]elivery is used in Article 8 to describe the
    formal steps necessary for a purchaser to acquire a direct interest in a security.” § 4-
    8-301 cmt. (emphasis added).
    Because Mr. Kutrubes’s shares were uncertificated, 9 Article 8 contemplates
    two ways that delivery could occur. First, “[d]elivery of an uncertificated security to
    a purchaser occurs when . . . [t]he issuer registers the purchaser as the registered
    owner, upon original issue or registration of transfer.” § 4-8-301(b)(1). Or when
    “[a]nother person, other than a securities intermediary, either becomes the registered
    8
    Section 4-8-104 also contemplates acquiring a security by acquiring a
    security entitlement. § 4-8-104(a)(2). But because this case is about whether Mr.
    Kutrubes validly transferred the security itself, acquiring a security entitlement is not
    implicated here.
    9
    Atlas also argues in the alternative that the stock certificates could be
    deemed certificated because “Atlas’s bylaws specified the shares were to be
    certificated.” Aplee.’s Resp. Br. at 47. The district court, however, rejected this
    argument. See Atlas II, 474 F. Supp. 3d at 1193. In doing so, the court offered the
    following reasoning: “Atlas admits that it created stock certificates for [Mr.]
    Kutrubes’s shares only after the Purported Transfer took place. Therefore, [Mr.]
    Kutrubes’s shares were not represented by a certificate at the time of the Purported
    Transfer. Accordingly, they were uncertificated securities under the [C]UCC.” Id.
    Atlas fails to show why the district court erred in concluding that the shares were in
    fact uncertificated. “‘Certificated security’ means a security that is represented by a
    certificate.” § 4-8-102(a)(4). Atlas does not point to any authority supporting the
    proposition that the mere statement in a company’s bylaws that shares should be
    certificated means that the shares “were represented by a certificate,” even if, as here,
    no share certificates were printed at the time of the alleged transfer. Therefore,
    absent authority to support it, Atlas’s alternative ground for supporting the district
    court’s judgment is not sufficiently firm for us to rely on it, and we do not do so.
    48
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    owner of the uncertificated security on behalf of the purchaser or, having previously
    become the registered owner, acknowledges that it holds for the purchaser.” § 4-8-
    301(b)(2).
    2
    Mr. Kutrubes’s attempted transfer of his shares to Biowest did not constitute a
    delivery of uncertificated securities under § 4-8-301. First, in the instant action,
    neither party disputes that Atlas is the issuer of Mr. Kutrubes’s stock, and that it did
    not register Biowest as the registered owner. See Aplt.’s App., Vol. III, at 149.
    Thus, the district court correctly concluded the first condition was not met. See id. at
    150. And regarding the second condition, again, Atlas never registered Mr. Kutrubes
    as the owner of the uncertificated securities on behalf of Biowest. Furthermore, Mr.
    Kutrubes did not claim to hold his shares on behalf of Biowest. 10 Accordingly, there
    is no basis for application of the second condition for delivery either. Therefore, Mr.
    Kutrubes’s attempted transfer of his shares to Biowest did not constitute a delivery of
    uncertificated securities under § 4-8-301.
    3
    Biowest’s arguments to the contrary are unavailing. We explain why in the
    following order. First, we will consider Biowest’s argument that common law
    10
    Mr. Kutrubes own actions further negate such an idea, and further
    undermine the assertion that the assignment to Biowest was final and irrevocable.
    Recall that more than one year after the purported transfer, on June 18, 2019, Mr.
    Kutrubes held himself out as the owner of the shares in his “Request for Inspection and
    Copying of Corporate Records.” Aplt.’s App., Vol. II, at 252–53.
    49
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    doctrines of property supersede Article 8. Next, we will examine whether Atlas
    violated its duty to register the transfer. Finally, we consider whether the doctrine of
    equitable transfer applies.
    a
    First, Biowest’s argument that it owns the shares regardless of whether the
    alleged transfer complied with Article 8 fails. Biowest argues that “the District Court
    confuses the distinction between ownership of stock in a corporation and the
    subsequent registration of stock on the corporate records of the issuer.” Aplt.’s
    Opening Br. at 31; see id. (“By analogy, the Article 8 process of registration and
    delivery of stock occurs after a sale of shares and is akin to recording a real estate
    deed after a property has been purchased.”). In line with this argument, Biowest
    contends that the district court incorrectly applied the law of “basic ownership of
    property” when it looked to Article 8 because “a present and irrevocable assignment
    of [Mr. Kutrubes’s] interest in the Shares to Biowest, prior to those Shares being
    certificated (after the fact) by Atlas, governs their ownership.” Id. at 33–34; see
    Aplt.’s Reply Br. at 13 (“The assignment constituted a final transfer of [Mr.]
    Kutrubes’s 7% ownership interest in Atlas to Biowest.”); id. (“By its plain language,
    execution of an irrevocable assignment of interest is sufficient when there are no
    actual stock certificates.”).
    Yet in making this argument, Biowest does little to engage with the reality
    that Article 8 governs the transfer of ownership; instead Biowest only musters
    arguments about evidence of ownership of shares. In this regard, Biowest quotes
    50
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    several more-than-a-hundred-year-old Colorado and non-Colorado cases about stock
    certificates not being dispositive of ownership. See Aplt.’s Opening Br. at 33 (“[A]
    ‘certificate [of stock] was not necessary to complete ownership. . . . The fact of
    ownership may be inferred from other facts, in the absence of a certificate.’” (second
    alteration in original) (quoting Mountain Waterworks Const. Co. v. Holme, 
    113 P. 501
    , 506–07 (Colo. 1911) (internal citations omitted))); 
    id.
     (“The certificate is not the
    subject of ownership, but is simply an evidence of ownership.” (quoting Marshall v.
    Marshall, 
    53 P. 617
    , 619 (Colo. Ct. App. 1898))). Not only do the Colorado cases
    pre-date Colorado’s acceptance of the current CUCC by almost a hundred years, see
    
    id. at 35
    , they also illustrate Biowest’s attempt to sidestep the dispositive issue in the
    assessment of who owns the shares: that is, whether the transfer of ownership from
    Mr. Kutrubes complied with the CUCC’s transfer requirements. Although Biowest
    does argue that the “[r]evised Article 8 deals with the settlement of securities trades,
    not the trades or contracts for purchases of securities themselves,” 
    id. at 36
    , it points
    to no authority that anything other than Article 8 governs the transfer of ownership in
    this case.
    As mentioned above, Colorado caselaw and the CUCC itself make clear that
    the requirements of transfer are not some mere formality but instead are necessary
    requirements for an interest in stock to transfer. Specifically, the Colorado Supreme
    Court has made clear that “[t]itle to corporate stock in Colorado can only be
    transferred as provided by statute,” and “[t]he statutory methods are exclusive and
    any attempt or desire to convey stock by other means merely results in a naked
    51
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    promise to transfer ownership in the future.” Quandary Land Dev., 408 P.2d at 981.
    And the CUCC states that “[a] person acquires a security or an interest therein, under
    this article, if . . . [t]he person is a purchaser to whom a security is delivered pursuant
    to section 4-8-301.” § 4-8-104(a)(1). The Comment to § 4-8-301 explains that
    “[d]elivery is used in Article 8 to describe the formal steps necessary for a purchaser
    to acquire a direct interest in a security.” § 4-8-301 cmt. (emphasis added).
    Biowest’s attempt to distinguish authority that the district court relied on also
    fails. Biowest argues that the district court erred in relying on Mortgage Investments
    I, 
    70 P.3d 1176
    , and Mortgage Investments II, 
    93 P.3d 557
    , because in those
    decisions “the party seeking to establish ownership of the stock in question never
    received books and records necessary to prove he was the owner of uncertificated
    shares” and “evidence was presented there at trial that the corporation’s shares were
    indeed certificated, therefore requiring the application of [C]UCC Article 8 standards
    with respect to transfer and delivery of certificated shares.” Aplt.’s Opening Br. at
    31–32. But the fact that Mortgage Investments Corporation’s purported owner never
    received the documentation to show he was the owner of the uncertificated shares,
    which turned out to be certificated and subject to Article 8’s provisions for that class
    of shares, does not mean the district court erred in concluding that Article 8 governs
    the transfer here of uncertificated shares.
    In sum, Biowest’s reliance on common law principles of property and its
    attempt to distinguish the authority that the district court relied on both fail to
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    demonstrate that the Article 8 ownership-transfer principles do not govern this stock
    transfer.
    b
    Putting aside its contention that “the District Court’s order erroneously
    conflated the concept of ownership of stock with registration of shares,” Biowest also
    argues that the district court erred in concluding the “[s]hares were not registered to
    Biowest as a basis for its ruling that [C]UCC Article 8 was not complied with.” Id. at
    38. This was error by the court, argues Biowest, because, pursuant to 
    Colo. Rev. Stat. § 4-8-401
    , Atlas had a duty to register the shares to Biowest after “[Mr.]
    Kutrubes’s attorney notified Atlas of the sale, and provided Atlas with a copy of the
    Assignment executed by his client.” Aplt.’s Opening Br. at 39. Further, Biowest
    argues the district court incorrectly concluded that neither of these communications
    was sufficient because they did not come from an “appropriate person under 
    Colo. Rev. Stat. § 4-8-107
    (a), which is the ‘the registered owner of an uncertificated
    security.’” 
    Id. at 41
    . Specifically, it explains that this conclusion ignores “another
    basic premise of law – that an attorney is the agent of his client.” 
    Id.
    However, as Atlas points out, see Aplee.’s Resp. Br. at 51, a duty to register a
    transfer occurs only “if certain preconditions exist. If any of the preconditions do not
    exist, there is no duty to register transfer.” 
    Colo. Rev. Stat. Ann. § 4-8-401
     cmt.
    Among these conditions is that “[t]he . . . instruction is made by the appropriate
    person or by an agent who has actual authority to act on behalf of the appropriate
    53
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    person,” § 4-8-401(a)(2)—which is defined as “the registered owner of an
    uncertificated security,” § 4-8-107(a)(2).
    The communications made by Mr. Kutrubes’s attorney and Biowest’s attorney
    did not make the correct request and did not come from the correct person
    respectively. First, the communication from Mr. Kutrubes’s attorney simply states
    that Mr. Kutrubes “transferred [his] stock to a third party, Biowest, LLC” and
    attached a copy of the “Transfer and Conveyance of Common Stock.” Aplt.’s App.,
    Vol. II, at 131–33 (Letter Re: Atlas Biologicals, Inc.—Stock Transfer, dated Apr. 5,
    2018). Nowhere does this letter state that Mr. Kutrubes requests that Atlas register
    the transfer.
    And an attached form titled “Irrevocable Stock Transfer Power” leaves blank a
    line for “[t]he undersigned does hereby irrevocably constitute and appoint . . . an
    attorney to transfer the said stock on the books of the within named Company . . . .”
    Id. at 134. And, therefore, the form did not designate—and, consequently, did not
    allow—Mr. Kutrubes’s attorney to act as his agent who could instruct that the
    transfer be registered, even if the attorney had made the proper instruction. The fact
    that the transfer form was transmitted by Mr. Kutrubes’s attorney does not mean that
    the attorney necessarily had the authority to act as an agent within the contemplation
    of the CUCC. This is because, § 4-8-401(a)(2) requires actual authority from an
    appropriate person. Mr. Kutrubes’s attorney did not demonstrate to Atlas that he had
    the actual authority to order registration of the transfer. If anything, the omission of
    the attorney’s name from the stock transfer form creates the opposite inference. So
    54
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    even if Mr. Kutrubes’s attorney had uttered the correct instruction for Atlas to
    register the transfer to Biowest, the instruction would not have been supported by
    evidence that the attorney had the actual authority to act as Mr. Kutrubes’s agent in
    issuing it.
    Similarly, although Biowest’s attorney explicitly instructed Atlas “to transfer
    those shares to Biowest on Atlas’s stock ledger,” Aplt.’s App., Vol. II, at 150 (Email
    Re: Atlas Biologicals, Inc., dated Apr. 22, 2018), Biowest was not the registered
    owner of the shares, and no document was attached that made clear that Biowest’s
    attorney could act as Mr. Kutrubes’s agent. Therefore, because neither Mr.
    Kutrubes’s attorney, nor Biowest’s attorney was an appropriate person, Atlas had no
    obligation to register the transfer. 11
    11
    Atlas also argues that another prerequisite required to trigger its duty to
    register was not satisfied because Biowest was not a protected purchaser. See
    Aplee.’s Resp. Br. at 51. A protected purchaser is “a purchaser of a certificated or
    uncertificated security, or of an interest therein, who: (1) Gives value; (2) Does not
    have notice of any adverse claim to the security; and (3) Obtains control of the
    certificated or uncertificated security.” § 4-8-303(a). Although Atlas raises
    reasonable arguments for the first two elements, Aplee.’s Resp. Br. at 52–54, we
    need not speak definitively to them, because there is no question that Biowest has not
    satisfied the third prong. Section 4-8-106 defines “control” of uncertificated
    securities as “(1) The uncertificated security is delivered to the purchaser; or (2) The
    issuer has agreed that it will comply with instructions originated by the purchaser
    without further consent by the registered owner.” § 4-8-106(c). As discussed above,
    “delivery” of the uncertificated stock did not, and has not, occurred. And Atlas did
    not agree to comply with Biowest’s instructions. Although Biowest contests the first
    two elements—as to which we forgo opining upon—it does not raise any arguments
    that it had control of the shares. See Aplt.’s Reply Br. at 24–26. Therefore, focusing
    on this third element alone, it is clear that Biowest is not a protected purchaser, and,
    thus, Atlas had no duty to register the transfer on the ground that Biowest was a
    protected purchaser.
    55
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    c
    Finally, Biowest argues that the district court erred in concluding that the
    doctrine of equitable transfer did not apply to Mr. Kutrubes’s attempt to transfer his
    shares to Biowest. Aplt.’s Opening Br. at 42–44. “Equitable assignment of corporate
    stock, where there is a transfer of stock even though there is some technical defect in
    the mode of transfer, is recognized in Colorado.” Mortg. Invs. II, 
    93 P.3d at 560
    .
    However, “equitable title claims are recognized in Colorado only where the rights of
    third parties would not be affected.” Id.; cf. 
    id.
     (“Mortgage Investments was the
    holder of a deed of trust granted by BMC [i.e., Battle Mountain Corporation]. Its
    rights would be affected by the sale of the corpus of BMC to Tucker, who then
    changed the name of the corporation and conveyed and encumbered the property
    subject to the deed of trust.”); cf. also Sky Harbor, Inc. v. Jenner, 
    435 P.2d 894
    , 897
    (Colo. 1968) (ruling that a judgment lien creditor has priority over a person who
    holds only an equitable interest in the property).
    At the outset, we conclude that the equitable transfer doctrine is not applicable
    here because this case is between a transferee (i.e., Biowest) and a third party (i.e.,
    Atlas). The Colorado Supreme Court has explained “a party may not assert equitable
    title in a dispute between a transferee and a third party.” Mortg. Invs. I, 
    70 P.3d at 1187
    ; see Arfsten v. Higby, 
    372 P.2d 166
    , 168 (Colo. 1962) (recognizing “equitable
    titles where rights of third parties are not present”). As Atlas has underscored, the
    cases where Colorado courts have applied the equitable title doctrine have concerned
    claims between the transferor and transferee, see Aplee.’s Resp. Br. at 55, and those
    56
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    cases make clear that third parties were not involved, see Arfsten, 372 P.2d at 168
    (“Majority stockholders and corporate officers are not third parties within the
    protective coverage of the Uniform Stock Transfer Act.”). Therefore, application of
    the equitable transfer doctrine is not appropriate in disputes, like this one, that are not
    between the transferor and transferee.
    Furthermore, in light of the preceding discussion, there should be no doubt that
    Atlas’s rights would be detrimentally affected both as a judgment creditor and as the
    issuer of the shares. Biowest’s only argument to the contrary is that “the transfer of
    ownership of the Shares from [Mr.] Kutrubes to Biowest occurred upon [Mr.]
    Kutrubes’s execution of the Assignment, which was prior to Atlas seeking a pre-
    judgment attachment (which it obtained without notifying Biowest of the proceedings
    thereby precluding Biowest any opportunity to challenge the attachment).” Aplt.’s
    Opening Br. at 44. However, Biowest’s argument assumes a valid transfer of the
    shares that, as we discussed, finds no foundation in the controlling statute, Article 8.
    Moreover, Biowest points to no authority that supports its suggestion that it
    matters—for purposes of applying the equitable transfer doctrine—whether Atlas, as
    a holder of third-party interests, secured the writ of attachment shortly before or after
    the ostensible transfer of the shares to Biowest. Accordingly, based on the foregoing,
    we conclude that this is not a suitable case for application of the equitable transfer
    doctrine and accordingly, Biowest’s reliance on it is unavailing.
    ***
    57
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    In sum, Mr. Kutrubes’s stock transfer was legally invalid. Therefore, Atlas’s
    writ of attachment was effective in attaching his shares.
    IV
    For these reasons, we AFFIRM the district court’s grant of summary judgment
    on Atlas’s declaratory judgment claim.
    58