OPINION OF THE COURT
SCIRICA, Circuit Judge.
The principal issues in this appeal under Federal Rule of Civil Procedure 23(f) in this antitrust action are (1) whether Rule 23 requires scrutiny under
Daubert v. Merrell Dow Pharmaceuticals, Inc.,
509 U.S. 579, 113 S.Ct. 2786, 125 L.Ed.2d 469 (1993), of challenged expert testimony and (2) the propriety of class certification in light of the Supreme Court’s decision in
Comcast Corp. v. Behrend,
- U.S. -, 133 S.Ct. 1426, 185 L.Ed.2d 515 (2013)
(Comcast),
which re
versed
Behrend v. Comcast Corp.,
655 F.3d 182 (3d Cir.2011)
{Behrend),
after the District Court relied on
Behrend
in granting class certification. Because we find that the District Court had no opportunity to consider the implications of
Com-cast
and hold that, if applicable, a court must resolve any
Daubert
challenges to expert testimony offered to demonstrate conformity with Rule 23, we vacate and remand.
I.
Plaintiffs are direct purchasers of traditional blood reagents, products used to test blood compatibility between donors and recipients, from two companies, defendants Immucor, Inc., which has settled with plaintiffs, and Ortho-Clinical Diagnostics, Inc., the appellant here. Plaintiffs claim Ortho and Immucor violated federal antitrust law by conspiring to fix traditional blood reagent prices.
By 1999, the entire domestic supply of traditional blood reagents had come under the control of Ortho and Immucor in a duopoly in which both companies anticipated they could raise their prices and increase their profits.
In November 2000, Ortho and Immucor executives attended an annual trade meeting at which plaintiffs assert the conspiracy began. Soon thereafter, both Ortho and Immucor began increasing traditional blood reagents prices in rapid succession, and by 2009, many prices had risen more than 2000%. Following a Department of Justice probe, a number of private suits were filed and transferred by the Judicial Panel on Multidistrict Litigation to the District Court, which consolidated them in December 2009.
Plaintiffs seek damages under the Clayton Act,
see
15 U.S.C. § 15, for alleged horizontal price fixing in violation of the Sherman Act,
see
15 U.S.C. § 1. In July 2012, after preliminary approval of plaintiffs’ settlement with Immucor, the court-held a hearing to determine whether to certify plaintiffs’ class of “[a]ll individuals and entities who purchased traditional blood reagents in the United States directly from Defendants Immucor, Inc., and Ortho-Clinical Diagnostics, Inc. at any time from January 1, 2000 through the present.” 283 F.R.D. at 247. The court then certified the class over Ortho’s objection. We granted Ortho’s petition to appeal under Rule 23(f).
II.
Plaintiffs relied in part on expert testimony to produce their antitrust impact analyses and damages models. The District Court evaluated the testimony, the reliability of which Ortho consistently chal
lenged, and, in part by holding that the testimony “could evolve to become admissible evidence” at trial, determined that plaintiffs had met Rule 23(b)(3)’s predominance requirement.
See
283 F.R.D. at 243-45 (quoting
Behrend,
655 F.3d at 204 n. 13). Relying on our decision in
Behrend,
the court rejected Ortho’s challenges to plaintiffs’ damages models as irrelevant to class certification because, the court reasoned,
[vjirtually all of Ortho’s arguments go to the merits of the models [plaintiffs’ expert] has constructed: the question whether the models give rise to “a just and reasonable inference or [are] speculative.”
Behrend,
655 F.3d at 206. These merits questions have some force, and they may prove persuasive at the summary judgment stage. However, they do not overlap with the Rule 23 requirements, because they neither implicate a need for individual proof nor convince the Court that [the] models could not “evolve to become admissible evidence.”
Id.
at 204 n. 13.
Blood Reagents,
283 F.R.D. at 240-41 (third alteration in original).
On appeal, Ortho contends the trial court failed to rigorously scrutinize whether “questions of law or fact common to class members predominate over any questions affecting only individual members.” Fed.R.Civ.P. 23(b)(3). In particular, pointing to
Comcast,
Ortho asserts the trial court erred by declining to address at class certification whether plaintiffs’ damages models were capable of producing just and reasonable damage estimates at trial and by accepting plaintiffs’ theory as capable of proving classwide antitrust impact:
Or-tho also argues that, under the class certification standard, the trial court should have scrutinized the plaintiffs’ expert’s testimony under
Daubert.
III.
A.
Because the District Court did not have the opportunity to consider
Corn-cast’s
later-issued guidance in the first instance, we will vacate the class certification order and remand for reconsideration. Without foreclosing what other conclusions the District Court might reach regarding
Comcast’s
ramifications for antitrust damages models
or proving antitrust impact,
we believe
Behrend’s
“could evolve” formulation of the Rule 23 standard did not survive
Comcast. See Comcast,
133 S.Ct. at 1433 (criticizing
Behrend
for “finding it
unnecessary to decide “whether the [expert’s damages] methodology [was] a just and reasonable inference or speculative’ ” and indicating that such a methodology is not “acceptable so long as it can be applied classwide, no matter how arbitrary the measurements may be” (second alteration in original) (quoting
Behrend,
655 F.3d at 206)). As we stated in
In re Hydrogen Peroxide Antitrust Litigation,
Free access — add to your briefcase to read the full text and ask questions with AI
OPINION OF THE COURT
SCIRICA, Circuit Judge.
The principal issues in this appeal under Federal Rule of Civil Procedure 23(f) in this antitrust action are (1) whether Rule 23 requires scrutiny under
Daubert v. Merrell Dow Pharmaceuticals, Inc.,
509 U.S. 579, 113 S.Ct. 2786, 125 L.Ed.2d 469 (1993), of challenged expert testimony and (2) the propriety of class certification in light of the Supreme Court’s decision in
Comcast Corp. v. Behrend,
- U.S. -, 133 S.Ct. 1426, 185 L.Ed.2d 515 (2013)
(Comcast),
which re
versed
Behrend v. Comcast Corp.,
655 F.3d 182 (3d Cir.2011)
{Behrend),
after the District Court relied on
Behrend
in granting class certification. Because we find that the District Court had no opportunity to consider the implications of
Com-cast
and hold that, if applicable, a court must resolve any
Daubert
challenges to expert testimony offered to demonstrate conformity with Rule 23, we vacate and remand.
I.
Plaintiffs are direct purchasers of traditional blood reagents, products used to test blood compatibility between donors and recipients, from two companies, defendants Immucor, Inc., which has settled with plaintiffs, and Ortho-Clinical Diagnostics, Inc., the appellant here. Plaintiffs claim Ortho and Immucor violated federal antitrust law by conspiring to fix traditional blood reagent prices.
By 1999, the entire domestic supply of traditional blood reagents had come under the control of Ortho and Immucor in a duopoly in which both companies anticipated they could raise their prices and increase their profits.
In November 2000, Ortho and Immucor executives attended an annual trade meeting at which plaintiffs assert the conspiracy began. Soon thereafter, both Ortho and Immucor began increasing traditional blood reagents prices in rapid succession, and by 2009, many prices had risen more than 2000%. Following a Department of Justice probe, a number of private suits were filed and transferred by the Judicial Panel on Multidistrict Litigation to the District Court, which consolidated them in December 2009.
Plaintiffs seek damages under the Clayton Act,
see
15 U.S.C. § 15, for alleged horizontal price fixing in violation of the Sherman Act,
see
15 U.S.C. § 1. In July 2012, after preliminary approval of plaintiffs’ settlement with Immucor, the court-held a hearing to determine whether to certify plaintiffs’ class of “[a]ll individuals and entities who purchased traditional blood reagents in the United States directly from Defendants Immucor, Inc., and Ortho-Clinical Diagnostics, Inc. at any time from January 1, 2000 through the present.” 283 F.R.D. at 247. The court then certified the class over Ortho’s objection. We granted Ortho’s petition to appeal under Rule 23(f).
II.
Plaintiffs relied in part on expert testimony to produce their antitrust impact analyses and damages models. The District Court evaluated the testimony, the reliability of which Ortho consistently chal
lenged, and, in part by holding that the testimony “could evolve to become admissible evidence” at trial, determined that plaintiffs had met Rule 23(b)(3)’s predominance requirement.
See
283 F.R.D. at 243-45 (quoting
Behrend,
655 F.3d at 204 n. 13). Relying on our decision in
Behrend,
the court rejected Ortho’s challenges to plaintiffs’ damages models as irrelevant to class certification because, the court reasoned,
[vjirtually all of Ortho’s arguments go to the merits of the models [plaintiffs’ expert] has constructed: the question whether the models give rise to “a just and reasonable inference or [are] speculative.”
Behrend,
655 F.3d at 206. These merits questions have some force, and they may prove persuasive at the summary judgment stage. However, they do not overlap with the Rule 23 requirements, because they neither implicate a need for individual proof nor convince the Court that [the] models could not “evolve to become admissible evidence.”
Id.
at 204 n. 13.
Blood Reagents,
283 F.R.D. at 240-41 (third alteration in original).
On appeal, Ortho contends the trial court failed to rigorously scrutinize whether “questions of law or fact common to class members predominate over any questions affecting only individual members.” Fed.R.Civ.P. 23(b)(3). In particular, pointing to
Comcast,
Ortho asserts the trial court erred by declining to address at class certification whether plaintiffs’ damages models were capable of producing just and reasonable damage estimates at trial and by accepting plaintiffs’ theory as capable of proving classwide antitrust impact:
Or-tho also argues that, under the class certification standard, the trial court should have scrutinized the plaintiffs’ expert’s testimony under
Daubert.
III.
A.
Because the District Court did not have the opportunity to consider
Corn-cast’s
later-issued guidance in the first instance, we will vacate the class certification order and remand for reconsideration. Without foreclosing what other conclusions the District Court might reach regarding
Comcast’s
ramifications for antitrust damages models
or proving antitrust impact,
we believe
Behrend’s
“could evolve” formulation of the Rule 23 standard did not survive
Comcast. See Comcast,
133 S.Ct. at 1433 (criticizing
Behrend
for “finding it
unnecessary to decide “whether the [expert’s damages] methodology [was] a just and reasonable inference or speculative’ ” and indicating that such a methodology is not “acceptable so long as it can be applied classwide, no matter how arbitrary the measurements may be” (second alteration in original) (quoting
Behrend,
655 F.3d at 206)). As we stated in
In re Hydrogen Peroxide Antitrust Litigation,
the “proper task” of the trial court is “to consider carefully all relevant evidence and make a definitive determination that the requirements of Rule 23 have been met before certifying a class.” 552 F.3d 305, 320 (3d Cir.2008). “Class certification requires a finding that each of the requirements of Rule 23 has been met,”
id.;
factual determinations “must be made by a preponderance of the evidence,”
id.
at 307. “ ‘[Actual, not presumed, conformance’ with the Rule 23 requirements remains necessary,”
id.
at 322 (quoting
Gen. Tel. Co. of Sw. v. Falcon,
457 U.S. 147, 160, 102 S.Ct. 2364, 72 L.Ed.2d 740 (1982)), and “[a] party’s assurance to the court that it intends or plans to meet the requirements is insufficient,”
id.
at 318.
B.
We join certain of our sister courts to hold that a plaintiff cannot rely on challenged expert testimony, when critical to class certification, to demonstrate conformity with Rule 23 unless the plaintiff also demonstrates, and the trial court finds, that the expert testimony satisfies the standard set out in
Daubert.
The Supreme Court has emphasized that the class certification analysis must be “rigorous.”
Comcast,
133 S.Ct. at 1432 (quoting
Walr-Mart Stores, Inc. v. Dukes,
— U.S. -, 131 S.Ct. 2541, 2551, 180 L.Ed.2d 374 (2011)). This “rigorous analysis” applies to expert testimony critical to proving class certification requirements.
See, e.g., Comcast,
133 S.Ct. at 1433 (citing
Dukes,
131 S.Ct. at 2551-52);
Hydrogen Peroxide,
552 F.3d at 323. As part of the “rigorous analysis,” the Court has clarified, “[a] party seeking class certification must affirmatively demonstrate his compliance” with Rule 23.
Dukes,
131 S.Ct. at 2551. This means that the party seeking certification must “be prepared to prove that there are
in fact
sufficiently numerous parties, common questions of law or fact, typicality of claims or defenses, and adequacy of representation, as required by Rule 23(a). The party must also satisfy through evidentiary proof at least one of the provisions of Rule 23(b).”
Comcast,
133 S.Ct. at 1432 (emphasis in original) (quotation marks and citation omitted). Expert testimony that is insufficiently reliable to satisfy the
Daubert
standard cannot “prove” that the Rule 23(a) prerequisites have been met “in fact,” nor can it establish “through evidentiary proof’ that Rule 23(b) is satisfied. Other courts of appéals have reached this conclusion.
See Messner v. Nortkshore Univ. HealthSystem,
669 F.3d 802, 812 (7th Cir.2012) (“When an expert’s report or testimony is ‘critical to class certification,’ we have held that a district court must make a conclusive ruling on any challenge to that expert’s qualifications or submissions before it may rule on a motion for class certification.” (quoting
Am. Honda Motor Co. v. Allen,
600 F.3d 813, 815 (7th Cir.2010) (per curiam)));
In re Zum Pex
Plumbing Prods. Liab. Litig.,
644 F.3d 604, 614 (8th Cir.2011) (approving “a focused
Daubert
analysis which scrutinized the reliability of the expert testimony in light of the criteria for class certification and ’ the current state of the evidence”);
see also Ellis v. Costco Wholesale Corp.,
657 F.3d 970, 982 (9th Cir.2011) (citing the Supreme Court’s dictum in
Dukes
and stating, “In its analysis of Costco’s motions to strike [expert testimony at the class certification stage], the district court correctly applied the evidentiary standard set forth in
Daubert
”). Furthermore,- we believe the Supreme Court’s dictum in
Dukes
buttresses our decision.
See Dukes,
131 S.Ct. at 2553-54 (“doubling]” a district court’s “conclusion] that
Daubert
did not apply to expert testimony at the certification stage of class-action proceedings”).
In the District Court, plaintiffs relied on expert testimony to produce most of their antitrust impact analyses and damages models, which they offered to demonstrate that common questions predominated over individual questions as required by Rule 23(b)(3). The court evaluated the expert testimony and, in part because it held the testimony “could evolve to become admissible evidence” at trial, determined that it satisfied Rule 23. 283 F.R.D. at 243-45 (quoting
Behrend,
655 F.3d at 204 n. 13). The court also stated that “[a]t the present stage of the litigation, the Court also rejects Ortho’s arguments regarding the reliability of plaintiffs’ damages models.”
Id.
at 243.
Because Ortho consistently challenged the reliability of plaintiffs’ expert’s methodologies’ and the sufficiency of his testimony to satisfy Rule 23(b)(3), we leave it to the District Court on remand to decide in the first instance which of Ortho’s reliability attacks, if any, challenge those aspects of plaintiffs’ expert testimony offered to satisfy Rule 23 and then, if necessary, to conduct a
Daubert
inquiry before assessing whether the requirements of Rule 23 have been met.
IV.
For the foregoing reasons, we will vacate the class certification order and remand for proceedings consistent with this opinion.