Haley v. TIAA ( 2022 )


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  • 21-805-cv
    Haley v. TIAA
    In the
    United States Court of Appeals
    For the Second Circuit
    ________
    AUGUST TERM 2021
    ARGUED: MAY 10, 2022
    DECIDED: DECEMBER 1, 2022
    No. 21-805-cv
    MELISSA HALEY, individually and on behalf of herself
    and all others similarly situated,
    Plaintiff-Appellee,
    v.
    TEACHERS INSURANCE AND ANNUITY ASSOCIATION OF AMERICA,
    Defendant-Appellant. ∗
    ________
    Appeal from the United States District Court
    for the Southern District of New York.
    ________
    Before: NEWMAN, WALKER, and SULLIVAN, Circuit Judges.
    ________
    Melissa Haley alleges that a participant loan program that
    Teachers Insurance and Annuity Association of America (TIAA)
    ∗
    The Clerk of Court is directed to amend the caption as set forth above.
    2                                                           No. 21-805
    offered to her retirement plan is a prohibited transaction under the
    Employee Retirement Income Security Act of 1974 (ERISA). After
    ruling that Haley’s suit could proceed against TIAA as a non-
    fiduciary under ERISA, the district court certified a class of employee
    benefit plans whose fiduciaries contracted with TIAA to offer loans
    that were secured by a participant’s retirement savings.        In this
    interlocutory appeal challenging the certification decision, TIAA
    argues that the district court erred when it found that common issues
    predominated over individual ones without addressing the effect of
    ERISA’s statutory exemptions on liability classwide and without
    making any factual findings as to the similarities of the loans. We
    agree. Because the predominance inquiry of Federal Rule of Civil
    Procedure 23(b)(3) requires that a district court analyze defenses, and
    the court did not do so here, we VACATE the district court’s decision
    and REMAND for proceedings consistent with this opinion.
    ________
    TODD S. COLLINS (Ellen T. Noteware, on the brief),
    Berger Montague PC, Philadelphia, PA; John J.
    Nestico, Todd M. Schneider, on the brief, Schneider
    Wallace Cottrell Konecky LLP, Charlotte, NC and
    Emeryville, CA, for Plaintiff-Appellee.
    JAIME A. SANTOS (James O. Fleckner, Michael K.
    Isenman, Kelsey Pelagalli, on the brief), Goodwin
    Procter LLP, Washington, DC and Boston, MA, for
    Defendant-Appellant.
    Leah M. Nicholls, on the brief, Public Justice, P.C.,
    Washington, DC, for amicus curiae Public Justice.
    3                                                            No. 21-805
    Dara S. Smith, William Alvarado Rivera, on the
    brief, AARP Foundation, Washington, DC, for amici
    curiae AARP and AARP Foundation.
    Meaghan VerGow, on the brief, O’Melveny &
    Myers LLP, Washington, DC, for amici curiae The
    Securities Industry and Financial Markets Association,
    American Benefits Council, Society of Professional
    Asset Managers and Recordkeepers, American Council
    of Life Insurers, and Chamber of Commerce of the
    United States of America.
    ________
    JOHN M. WALKER, JR., Circuit Judge:
    Melissa Haley alleges that a participant loan program that
    Teachers Insurance and Annuity Association of America (TIAA)
    offered to her retirement plan is a prohibited transaction under the
    Employee Retirement Income Security Act of 1974 (ERISA). After
    ruling that Haley’s suit could proceed against TIAA as a non-
    fiduciary under ERISA, the district court (Oetken, J.) certified a class
    of employee benefit plans whose fiduciaries contracted with TIAA to
    offer loans that were secured by a participant’s retirement savings. In
    this interlocutory appeal challenging the certification decision, TIAA
    argues that the district court erred when it found that common issues
    predominated over individual ones without addressing the effect of
    ERISA’s statutory exemptions on liability classwide and without
    making any factual findings as to the similarities of the loans. We
    agree. Because the predominance inquiry of Federal Rule of Civil
    Procedure 23(b)(3) requires that a district court analyze defenses, and
    4                                                                No. 21-805
    the court did not do so here, we VACATE the district court’s decision
    and REMAND for proceedings consistent with this opinion.
    BACKGROUND
    Haley participates in a retirement plan offered by Washington
    University in St. Louis (WashU).         The WashU plan is a defined
    contribution savings plan that is tax-deferred under 
    26 U.S.C. § 403
    (b)
    and governed by ERISA. 1 WashU chose to offer certain services to its
    participants, including the ability to borrow against retirement
    savings without incurring a taxable event.           During the relevant
    period, WashU plan participants were permitted to take out either
    non-collateralized or collateralized loans. To facilitate these loans,
    WashU engaged with outside vendors known as “service providers,”
    including TIAA and Vanguard.
    Non-collateralized loans enable participants to borrow directly
    from their retirement accounts without pledging any assets as
    collateral. Vanguard serviced the non-collateralized loans for WashU
    plan participants and charged participants a fixed origination fee and
    annual maintenance fees. Non-collateralized loans are not at issue in
    this case.
    This suit instead challenges the collateralized loan products
    that TIAA offered. Fiduciaries responsible for some eight thousand
    plans, such as WashU, retained TIAA to service collateralized loans
    for their respective plans.       The collateralized loans shared the
    1 
    29 U.S.C. § 1002
    (34). Defined contribution plans are retirement
    savings vehicles that allow participants to contribute a portion of their
    salary to the plan. Section 403(b) plans are available to employees of public
    schools and certain non-profits.
    5                                                              No. 21-805
    following attributes.    TIAA required participants to borrow the
    desired loan amount from TIAA’s “General Account” rather than
    directly from their own retirement accounts. 2 TIAA charged interest
    on the loan, which participants paid (along with the principal) to the
    General Account. The interest rates that participants paid, however,
    depended on several variables, including the type of loan contract
    between TIAA and the plan and the relevant state’s insurance laws.
    TIAA secured the loans with collateral equal to the loan
    amount plus 10%.        TIAA invested that sum in the participant’s
    account in a TIAA Traditional Annuity, an interest-bearing fixed
    annuity that paid a guaranteed minimum rate of return, plus
    additional amounts of interest declared at TIAA’s discretion. The
    plan participant kept the return earned on the collateral. Returns
    varied based on the type of the annuity contract that TIAA offered to
    the plan, and when and where the loan was obtained. The underlying
    annuity contract also affected whether a borrowing participant could
    designate funds already invested in a TIAA Traditional Annuity as
    collateral or whether the participant had to transfer funds from
    existing investments into a TIAA Traditional Annuity.
    While it did not charge origination or maintenance fees, TIAA
    was compensated for servicing the loans.           TIAA states that its
    compensation was the difference, or “spread,” between the interest
    2 An insurance company’s “general account” refers to the assets that
    guarantee the insurer’s obligations under its insurance contracts and
    provide liquidity. Participants do not invest directly in the General
    Account, which TIAA represents is a broadly diversified portfolio of mostly
    fixed income assets.
    6                                                                No. 21-805
    that participants paid TIAA on the loan and the amount TIAA
    credited to participants on their collateral as investment income. 3
    Haley took out four collateralized loans from her WashU plan
    between 2011 and 2015, and a fifth in 2019 while this lawsuit was
    pending. In 2017, she brought the instant action seeking to hold TIAA
    directly liable on the grounds that the collateralized loans violated
    ERISA’s so-called “prohibited transactions” rules. In the alternative,
    Haley sought to hold TIAA liable as a non-fiduciary for its knowing
    participation in the alleged violations by her plan fiduciary, WashU.
    Haley, however, did not name WashU as a defendant.
    The district court held that TIAA was not an ERISA fiduciary
    with respect to the challenged loans but permitted Haley’s claims to
    proceed against TIAA as a non-fiduciary. Haley then moved to certify
    a nationwide class of similarly situated ERISA-governed plans. TIAA
    opposed, asserting that the challenged loans were too disparate to
    warrant class treatment. TIAA further objected to certification on the
    grounds that ERISA recognizes exemptions to prohibited transactions
    and that the factors relevant to whether a collateralized loan is exempt
    are not subject to common proof. The district court certified a class
    under Rule 23(b)(3) as to each of Haley’s non-fiduciary claims. But
    the court did not make any findings about the purported variations
    among the loans in the putative class and did not address how the
    exemptions to the statutory prohibitions weighed in the certification
    analysis. TIAA timely filed an interlocutory appeal under Rule 23(f).
    3 Haley alleged that the spread is even greater because it includes the
    difference between the returns earned on the investments in TIAA’s
    General Account and the interest rate that TIAA credits the participants on
    their collateral. Regardless, this difference is not material to this appeal.
    7                                                                 No. 21-805
    DISCUSSION
    Haley is not the first WashU plan participant to allege that the
    collateralized loans serviced by TIAA are prohibited transactions
    under ERISA. 4 But her suit is unique because she is seeking to hold
    TIAA liable on behalf of a nationwide class of ERISA-governed plans
    whose members received loans under terms approved by plan
    administrators, without naming those administrator fiduciaries as
    defendants. TIAA argues that the district court improperly certified
    the multi-plan class. 5
    4  See Davis v. Wash. Univ. in St. Louis, No. 4:17-CV-1641 RLW, 
    2018 WL 4684244
    , at *5 (E.D. Mo. Sept. 28, 2018) (dismissing the ERISA
    § 406(a)(1)(B) claim against WashU), aff'd in part, rev'd in part and remanded,
    
    960 F.3d 478
     (8th Cir. 2020). The Davis plaintiffs did not appeal the
    dismissal of their prohibited transaction claims.
    5 The class certified by the district court includes: “All individual
    account retirement plans governed by ERISA (the ‘Plans‘) for which, at any
    time from February 5, 2011 through the date of judgment: (a) Teachers
    Insurance and Annuity Association [of America] (‘TIAA’) provided
    services that included collateralized loans (the ‘Loans’) for Plan participants
    (the ‘Borrowing Participants’); (b) TIAA required the Borrowing
    Participants to provide collateral in the amount of 110% of the principal
    balance of the Loans, which collateral TIAA invested in its general account;
    and (c) (i) TIAA charged Loan interest at a rate in excess of the interest rate
    credited to Borrowing Participants on the invested collateral; (ii) TIAA kept
    for or paid to itself amounts earned on the amount of the invested collateral,
    equal to the principal amount of the outstanding Loans, that were in excess
    of the amounts credited to Borrowing Participants; (iii) the amounts that
    TIAA credited to Borrowing Participants on the invested collateral in excess
    of the principal amount of the Loan were less than Borrowing Participants
    would have received had the collateral remained in the Borrowing
    Participants’ designated investment options; and/or (iv) TIAA caused loss
    to the Participant Borrowers and the Plans.” Special App’x 5.
    8                                                                  No. 21-805
    I.      ERISA’s Prohibited Transactions, Briefly Explained
    ERISA is a comprehensive federal statute that regulates
    retirement and employee benefit plans, as well as the conduct of
    fiduciaries who act on behalf of plan participants and other
    beneficiaries. 6 Section 404 of ERISA sets out general duties for plan
    fiduciaries, sponsors, and others.          Section 406 further protects
    participants and beneficiaries by prohibiting certain transactions
    involving plan assets that are “believed to pose a high risk of fiduciary
    self-dealing.” 7 Subsection 406(a) regulates transactions between a
    plan and “parties in interest” with respect to the plan. A “party in
    interest” includes, among others, persons providing services to the
    plan. 8        Haley alleges that the collateralized loans violate two
    provisions of § 406(a):
    Except as provided in section [408] of this title . . . [a]
    fiduciary with respect to a plan shall not cause the plan
    to engage in a transaction, if he knows or should know
    that such transaction constitutes a direct or indirect—
    ...
    (B) lending of money or other extension of credit
    between the plan and party in interest; [or]
    See Harris Tr. & Sav. Bank v. John Hancock Mut. Life Ins. Co., 
    302 F.3d
            6
    18, 26 (2d Cir. 2002) (quoting H.R. Rep. No. 533, 93d Cong., 2nd Sess. 1,
    reprinted in 1974 U.S.C.C.A.N. 4639, 4639).
    7 Henry v. Champlain Enters., Inc., 
    445 F.3d 610
    , 618 (2d Cir. 2006).
    8 
    29 U.S.C. § 1002
    (14)(B). At a general level, a “party in interest” is
    any entity “that a fiduciary might be inclined to favor at the expense of the
    plan’s beneficiaries.” Harris Tr. & Sav. Bank v. Salomon Smith Barney, Inc.,
    
    530 U.S. 238
    , 242 (2000).
    9                                                                     No. 21-805
    (D) transfer to, or use by or for the benefit of a party in
    interest, of any assets of the plan[.] 9
    Section 406(a)’s broad language would ban most transactions
    involving service providers, like TIAA. But § 406(a) is expressly
    limited by § 408, which authorizes the Secretary of Labor to exempt
    certain transactions so long as they are in the “interests of the plan’s
    participants and beneficiaries.” 10 TIAA asserts that two exemptions
    are potentially applicable here. 11 First, § 408(b)(1) exempts loans to
    participants provided that, among other things, they are made in
    accordance with specific provisions of the plan document, “bear a
    reasonable rate of interest,” and are “adequately secured.” 12 Second,
    § 408(b)(17) permits transactions prohibited by § 406(a)(1)(B) and (D)
    as long as the plan pays no more and receives no less than “adequate
    consideration.” 13
    9   
    29 U.S.C. §§ 1106
    (a)(1)(B), (D). Haley initially also alleged that
    TIAA charged excessive and unreasonable compensation, in violation of
    § 406(a)(1)(C). Haley does not oppose TIAA’s request to modify the
    certification order as to this claim.
    10 Boggs v. Boggs, 
    520 U.S. 833
    , 846 (1997) (citing 
    29 U.S.C. § 1108
    (a)(2))
    (internal quotation marks omitted).
    11 Because Haley has conceded that her § 406(a)(1)(C) claim should
    not be resolved classwide, we need not consider TIAA’s arguments that the
    exemption to excessive compensation claims as set forth in § 408(b)(2)
    applies.
    12 
    29 U.S.C. § 1108
    (b)(1). The Department of Labor’s definition of
    “participant loans” presupposes that the loan is exempt under § 408(b)(1)
    and thus not a prohibited transaction. See 
    29 C.F.R. § 2550
    .408b-1(a)(3)(i).
    For our purposes, although we may use the term participant loan as
    shorthand, we express no opinion as to whether the challenged loans in fact
    meet the statutory definition.
    13 
    29 U.S.C. § 1108
    (b)(17)(A).
    10                                                                      No. 21-805
    II.     Standard of Review
    We review class certification decisions, including a district
    court’s rulings that each of the Rule 23 requirements are satisfied, for
    abuse of discretion. 14 We give greater deference to decisions granting
    class certification than to those declining to certify. 15 But “[t]o be
    afforded this deference . . . the certification must be sufficiently
    supported and explained.” 16
    Rule 23(a) requires that a proposed class be sufficiently
    numerous, have questions of law or fact common to the class, and
    involve representative plaintiffs whose claims or defenses are typical
    of the class and who can fairly and adequately protect the class’s
    interests. 17 The district court certified the class under Rule 23(b)(3),
    pursuant to which a plaintiff must also establish that questions of law
    or fact common to the putative class “predominate” over questions
    affecting only individual members and that the class action vehicle is
    the superior method of adjudication. 18
    III.    TIAA’s Challenges to Certification
    TIAA disputes Haley’s ability to show both that there are
    questions common to the class and that such issues predominate.
    14   In re Initial Pub. Offerings Sec. Litig., 
    471 F.3d 24
    , 31 (2d Cir.
    2006), decision clarified on denial of reh'g sub nom. In re Initial Pub. Offering Sec.
    Litig., 
    483 F.3d 70
     (2d Cir. 2007); Johnson v. Nextel Commc’ns. Inc., 
    780 F.3d 128
    , 137 (2d Cir. 2015).
    15 See Johnson, 
    780 F.3d at 137
    .
    16 Langan v. Johnson & Johnson Consumer Cos., Inc., 
    897 F.3d 88
    , 97 (2d
    Cir. 2018).
    17 Fed. R. Civ. P. 23(a).
    
    18 Johnson, 780
     F.3d at 137; Fed. R. Civ. P. 23(b)(3).
    11                                                               No. 21-805
    Because the district court determined that predominance was
    satisfied without analyzing the § 408 exemptions or TIAA’s claimed
    variations among the loans, we vacate and remand for it to undertake
    that inquiry in the first instance.
    A.     Commonality
    “Where the same conduct or practice by the same defendant
    gives rise to the same kind of claims from all class members, there is
    a common question.” 19 Commonality is usually easier to show than
    predominance 20 and the district court did not abuse its discretion in
    finding that former requirement satisfied. As an example, whether
    the uniform requirement that collateral be held in a TIAA annuity
    product rendered TIAA a party in interest “us[ing] . . . [plan] assets”
    in violation of § 406(a)(1)(D) is a common issue bearing on the
    defendant’s liability to the putative class. 21 TIAA recycles many of its
    arguments relating to commonality in its challenge to Haley’s ability
    to satisfy predominance.         Because those arguments are “more
    
    19 Johnson, 780
     F.3d at 137 (internal citation and quotation marks
    omitted).
    20 Comcast Corp. v. Behrend, 
    569 U.S. 27
    , 34 (2013).
    21 
    29 U.S.C. § 1106
    (a)(1)(D). TIAA does not dispute that this attribute
    was a common feature of the collateralized loans it serviced.
    12                                                                     No. 21-805
    efficiently addressed in light of the predominance . . . requirement[],”
    we will consider them in that context. 22
    B.     Predominance
    TIAA’s principal argument is that the district court erred by
    failing to include ERISA’s statutory exemptions as part of its
    predominance inquiry. We agree.
    Predominance is not simply an exercise in tallying up issues; it
    is a qualitative inquiry that entails “careful scrutiny” of the nature and
    significance of a case’s common and individual issues. 23 To that end,
    a complete assessment of predominance demands that a district court
    “consider all factual or legal issues” and classify them as subject either
    to common or individual proof. 24 It is well settled that this exercise
    includes any affirmative defenses, 25 such as the § 408 exemptions. 26
    Affirmative defenses do not carry “less weight” on the class
    certification issue simply because the defendant will bear the burden
    
    22 Johnson, 780
     F.3d at 140.
    23   See In re Petrobras Sec., 
    862 F.3d 250
    , 271 (2d Cir. 2017) (internal
    quotation marks and emphasis omitted); 1 McLaughlin on Class Actions
    § 5:23 (18th ed.).
    24 Myers v. Hertz Corp., 
    624 F.3d 537
    , 550 (2d Cir. 2010) (internal
    citation and quotation marks omitted).
    25 
    Id.
     (collecting cases); Johnson, 
    780 F.3d at 138
     (noting that as part of
    both the commonality and predominance analysis, the court “must assess
    . . . the elements of the claims and defenses to be litigated” (internal
    quotation marks omitted)).
    26 Henry, 445 F.3d at 619; Lowen v. Tower Asset Mgmt., Inc., 
    829 F.2d 1209
    , 1215 (2d Cir. 1987).
    13                                                           No. 21-805
    of proof at the merits stage. 27 Here, as explained below, the district
    court’s treatment of the exemptions was simply to exclude them from
    the predominance analysis because, as affirmative defenses, the
    burden of proving them rests with TIAA. Rule 23(b)(3) demands
    more.
    We start with § 408(b)(17), which exempts transactions that
    otherwise violate § 406(a)(1)(B) and (D) as long as the “plan receives
    no less, nor pays no more, than adequate consideration.” 28 There is
    no rule that clearly defines what consideration is “adequate”; it is
    instead a standard that takes into account whether the fiduciary
    exercised “good faith” in approving the amount the plan pays or
    receives. 29 So, our “focus[] [is] on the conduct of the fiduciaries in
    determining the price, not the price itself.” 30 Haley asserts that the
    “adequacy” determination can be made classwide because good faith
    is evaluated against what is objectively reasonable. TIAA argues that
    individualized proof must be marshalled from non-party plan
    fiduciaries showing how each plan fiduciary valued the assets and
    whether, given other options available to the plan, the fiduciary
    exercised good faith in selecting the terms offered by TIAA. So, even
    if good faith is measured against an objective metric, the application
    27Myers, 
    624 F.3d at 551
    . TIAA does not dispute that, as a non-
    fiduciary, it also bears the burden of showing that an exemption applies.
    28 
    29 U.S.C. § 1108
    (b)(17)(A).
    29 
    29 U.S.C. § 1108
    (b)(17)(B)(ii).
    30 Henry, 445 F.3d at 619–20 (emphasis added) (interpreting the
    Department of Labor’s Proposed Regulation Relating to the Definition of
    Adequate Consideration, 
    53 Fed. Reg. 17,632
    , 17,634) (May 17, 1988) and
    noting that, although the proposed regulation had no legal effect,
    “numerous circuit courts have adopted the DOL’s proposed definition”).
    14                                                            No. 21-805
    of facts pertaining to each non-party fiduciary may be individualized.
    Notwithstanding this dispute, the district court limited its analysis to
    suggesting only that determining whether the plans received
    adequate compensation “is not quite as easy” to resolve with common
    proof. 31
    As for the other exemption that TIAA asserts may apply, the
    district court’s decision gives us no indication that the court factored
    it into its predominance analysis at all. Section 408(b)(1) exempts
    loans “made by the plan to parties in interest who are participants or
    beneficiaries of the plan” so long as, inter alia, the loans are “made in
    accordance with specific provisions regarding such loans set forth in
    the plan,” “bear a reasonable rate of interest,” and “are adequately
    secured.” 32 The parties’ briefs dispute whether the loans are eligible
    for a § 408(b)(1) exemption and whether such a determination could
    be made with classwide proof. TIAA emphasizes the individualized
    nature of reviewing each loan against the specific plan’s governing
    documents to ensure compliance. 33 It adds that by submitting only
    her loan contract, Haley failed to supply the district court with
    necessary proof that the various plans in the purported class were
    sufficiently similar.    TIAA also relies on regulations that define
    “reasonableness” in light of rates that would be offered by “local
    banks” and financial institutions in the community, as well as current
    economic conditions, to argue that reasonableness is necessarily a
    fact- and plan-specific inquiry. 34         Haley counters that the same
    31 Special App’x 22.
    32 
    29 U.S.C. § 1108
    (b)(1).
    33 See 
    29 C.F.R. § 2550
    .408b-1(d).
    34 
    29 C.F.R. § 2550
    .408b-1(e).
    15                                                             No. 21-805
    regulations provide that a “loan program containing a precondition
    designed to benefit a party in interest (other than the participant) is
    not afforded relief by section 408(b)(1).” 35 According to Haley, even
    assuming the interest rate charged on each loan in the class is
    reasonable, requiring borrowers to invest their collateral in a TIAA
    Traditional Annuity is a disqualifying “precondition.”
    That certain of the exemption-related issues may overlap with
    the merits of this case does not absolve a district court from
    addressing them at the certification stage when such determinations
    bear on assessing a Rule 23 requirement. 36 The court must still find
    that each of the requirements is satisfied in order to certify a class. We
    recognize, however, that the “determination as to a Rule 23
    requirement is not binding on the trier of fact in its determination of
    the merits.” 37
    Because the district court did not analyze the exemptions, it
    also did not engage with the evidence that TIAA submitted to
    substantiate the purported variations among the plans. A district
    court cannot simply “take the plaintiff’s word that no material
    differences exist.” 38   While it may be true, as the district court
    surmised, that the loans had the “same basic central . . . structure,” it
    made no findings about the interest rates that TIAA credited on the
    collateral, the interest rates that participants paid, and whether those
    rates varied across loans to support its conclusion that the class
    35 
    29 C.F.R. § 2550
    .408b-1(a)(3)(i).
    36 Wal-Mart Corp. v. Dukes, 
    564 U.S. 338
    , 351–52 & n.6 (2011); In re
    I.P.O. Sec. Litig., 
    471 F.3d at 41
    .
    
    37 Johnson, 780
     F.3d at 138.
    38 Langan, 
    897 F.3d at 97
    .
    16                                                               No. 21-805
    members were adversely affected in the same way. 39               We have
    instructed that a district court must “assess all of the relevant
    evidence admitted at the class certification stage.” 40 The district court
    did not do that here and, in the process, impaired our appellate
    review.
    On this basis, we cannot say the district court took the requisite
    “close look at whether the common legal questions predominate over
    individual ones.” 41 We are thus constrained to find that the district
    court’s determination on predominance was not “within the range of
    permissible decisions,” 42 and therefore remand is required. 43
    39   Special App’x 9–10.
    40 In re I.P.O. Sec. Litig., 
    471 F.3d at 42
    .
    41 Langan, 
    897 F.3d at 97
     (internal citation and quotation marks
    omitted).
    42 Myers, 
    624 F.3d at 548
    .
    43 We are mindful that district courts have various “management
    tools” at their disposal, including bifurcating classwide issues from
    individual issues, and identifying subclasses of “more homogenous groups
    defined by common legal or factual questions.” In re Petrobras Sec., 
    862 F.3d at 274
    ; see Fed. R. Civ. P. 23(c)(4), (5). We reiterate in the interest of
    thoroughness that, if the district court were to rely on subclasses on
    remand, then it would need to (as any district court must) not only identify
    those subclasses but also explain their necessity and show that proceeding
    in that manner comports with Rule 23(b)(3)’s requirements. See Langan, 
    897 F.3d at 98
    . We express no opinion as to whether any of the tools we have
    identified here may be appropriate to this case and leave that determination
    to the district court in the first instance.
    17                                                     No. 21-805
    CONCLUSION
    In sum, we VACATE the district court’s decision and
    REMAND for further proceedings consistent with this opinion.