OPINION OF THE COURT
Investors in Diagnostic Ventures, Inc., brought this class action against multiple parties, alleging violations of § 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5. These interlocutory appeals under Fed.R.Civ.P. 23(f) present issues at the intersection of class action procedure and the securities laws. The District Court granted plaintiffs’ motion for class certification with respect to all defendants but one. Parties from both sides filed cross-appeals. We will affirm.
I.
Diagnostic Ventures, Inc., (DVI) was a healthcare finance company that extended loans to medical providers to facilitate the purchase of diagnostic medical equipment and leasehold improvements, and offered lines of credit for working capital secured by healthcare receivables. Founded in 1986, DVI was a publicly traded company with reported assets of $1.7 billion in 2003. Its common stock began trading on the New York Stock Exchange (NYSE) in 1992. It issued two tranches of 9 7/8% senior notes: the first, issued in 1997, totaled $100 million; the second, issued in 1998, totaled $55 million. The Notes were similar, 1 but the 1997 Notes were traded on the NYSE, while the 1998 Notes were traded over the counter.
On August 13, 2003, DVI announced it would file for Chapter 11 bankruptcy pro *628 tection resulting from the public disclosure of alleged misrepresentations or omissions as to the amount and nature of collateral pledged to lenders. In the ensuing years, its common stock and 1997 Notes were delisted from the NYSE, the Securities and Exchange Commission and Department of Justice undertook investigations, its former Chief Financial Officer, Steven Garfinkel, pleaded guilty to fraud, the bankruptcy trustee and multiple lenders filed lawsuits, and the company dissolved.
On September 23, 2003, Cedar Street Fund, Cedar Street Offshore Fund, and Kenneth Grossman 2 filed a class action lawsuit alleging violations of federal securities laws. 3 In their Fifth Amended Complaint, plaintiffs assert claims under § 10(b) of the Securities Exchange Act of 1934, 15 U.S.C. § 7§j(b), and the SEC’s Rule 10b-5,17 C.F.R. § 240.10b-5, against multiple defendants, of which only Deloitte & Touche LLP and Clifford Chance LLP are involved in these appeals. 4 Deloitte was DVI’s certified public accountant from 1987 to June 2003. Clifford Chance served as the company’s lead corporate counsel, particularly advising on disclosure obligations under federal securities laws during the time period relevant to these appeals.
The Fifth Amended Complaint alleges that between August 10, 1999, and August 13, 2003, defendants engaged in a scheme designed to artificially inflate the price of DVI securities by: (1) refusing to write down millions of dollars of impaired assets; (2) double-pledging collateral and/or pledging ineligible collateral; (3) refusing to implement internal controls or to comply with those in place; and (4) concealing cash shortages by overstating revenues, assets, and earnings, and understating liabilities and expenses. Fifth Am. Compl. ¶ 9. Specifically, plaintiffs contend Deloitte committed securities fraud by wrongfully issuing unqualified, or “clean,” audit reports for fiscal years 1999 to 2002, hiding DVI’s improper accounting practices, and declining to force the company to disclose its fraudulent acts. Id. ¶¶ 424-85, 537-57. With respect to Clifford Chance, plaintiffs contend the law firm assisted DVI in its scheme by drafting fraudulent financial reports (in particular, DVI’s 10-Q disclosure for the quarter ending September 30, 2002), conspiring with *629 other defendants to hide material information about the company’s financial condition, and deflecting inquiries from the SEC. 5 Id. ¶¶ 363-409, 558-65.
Plaintiffs moved to certify a class under Fed.R.Civ.P. 23(b)(3) on behalf of DVI investors who purchased securities during the period in which the company allegedly made misrepresentations. The District Court granted plaintiffs’ motion with respect to all defendants but Clifford Chance. The court analyzed the Rule 23 prerequisites and concluded that each was met. Specifically, it found plaintiffs met Rule 23(b)(3)’s predominance requirement by successfully invoking the fraud-on-the-market presumption of reliance. But the court found plaintiffs were not entitled to a presumption of reliance with respect to Clifford Chance because its conduct was not publicly disclosed and it owed no duty of disclosure to DVI’s investors. Therefore, individual issues predominated over common issues and a class could not be certified against Clifford Chance. The court appointed lead plaintiffs as class representatives and defined the class as:
All persons and entities who purchased or otherwise acquired the securities of DVI, Inc. (including its common stock and 9 7/8% Senior Notes) between August 10, 1999 and August 13, 2003, inclusive and who were thereby damaged. Excluded from the class are Defendants; any entity in which a Defendant has a controlling interest or is a part or subsidiary of, or is controlled by a Defendant; the officers, directors, legal representatives, heirs, predecessors, successors and assigns of any of the Defendants; Lead Plaintiffs named in WM High Yield Fund, et al. v. O’Hanlon, et al., No. 04-CV-3423 (E.D.Pa.).
Of the many defendants, initially, only Deloitte filed a petition for leave to appeal. See Fed.R.Civ.P. 23(f). After the District Court denied plaintiffs’ motion for partial reconsideration of the court’s order with respect to Clifford Chance, they too filed a petition for leave to appeal under Rule 23(f). 6
To certify a class, the proposed class representative must satisfy each of the four requirements in Rule 23(a) — numerosity, commonality, typicality, and adequacy' — -and the putative class action must meet the requirements of one of the subsections of Rule 23(b). 7 Fed.R.Civ.P. 23. *630 Plaintiffs seek certification under Rule 23(b)(3), which requires that (1) “the questions of law or fact common to class members predominate over any questions affecting only individual members,” and (2) “that a class action is superior to other available methods for fairly and efficiently adjudicating the controversy.” Fed. R.Civ.P. 23(b)(3). These twin requirements are known as predominance and superiority.
The only Rule 23 requirement raised on appeal is predominance.
8
Predominance requires that “[i]ssues common to the class ... predominate over individual issues.... ”
Hydrogen Peroxide,
Plaintiffs assert claims under § 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5.
9
The elements of a § 10(b) private action are: “(1) a material misrepresentation or omission by the defendant; (2) scienter; (3) a connection between the misrepresentation or omission and the purchase or sale of a security; (4) reliance upon the misrepresentation or omission; (5) economic loss; and (6) loss causation.”
Stoneridge Inv. Partners, LLC v. Scientific-Atlanta, Inc.,
552 U.S.
*631
148, 157,
The parties dispute the reliance element of plaintiffs’ claims. Reliance, also known as transaction causation, “establishes that but for the fraudulent misrepresentation, the investor would not have purchased or sold the security.”
Newton,
In order to facilitate securities class-actions, the Supreme Court established a rebuttable presumption of class-wide reliance based on the fraud-on-the-market theory.
10
Id.
at 245-47,
The Supreme Court appears to have endorsed the semi-strong version of the efficient capital market hypothesis.
See Schleicher v. Wendt,
To invoke the fraud-on-the-market presumption of reliance, plaintiffs must show they traded shares in an efficient market,
Semerenko v. Cendant Corp.,
Deloitte’s rebuttal arguments also implicate loss causation, a distinct legal element of § 10(b) and Rule 10b-5 claims. Loss causation is different from reliance and requires “a causal connection between the material misrepresentation and the loss.”
Dura Pharms., Inc. v. Broudo,
In adopting the rebuttable fraud-on-the-market presumption of reliance in
Basic,
the Supreme Court injected nascent economic theory into legal doctrine.
See Basic,
II.
Deloitte challenges the District Court’s application of the fraud-on-the-market presumption of reliance and its finding that predominance has been satisfied. Deloitte also contends the court’s factual findings on market efficiency were an abuse of discretion and that loss causation — a distinct element of the legal claims — must be established as a prerequisite before invoking the presumption of reliance. Finally, even if lead plaintiffs successfully invoked the presumption of reliance, Deloitte contends it has rebutted the presumption by demonstrating individual, as opposed to common, issues of loss causation predominate, and by demonstrating that plaintiffs relied on a strategy crafted to exploit market inefficiencies.
A.
Market efficiency is the cornerstone of the fraud-on-the-market presumption of reliance. As noted, to invoke the presumption of reliance, plaintiffs must show they traded securities in an efficient market,
Semerenko,
1.
The District Court examined plaintiffs’ and defendants’ expert reports and the parties’ arguments on market efficiency. The court considered several factors 14 in its analysis of DVI’s three securities (common stock, the 1997 Notes, and the 1998 Notes), 15 and concluded the market in which each traded was efficient.
*634 On appeal, Deloitte challenges several findings of fact, contending the court simply tallied efficiency factors rather than engaging in a thoroughgoing market efficiency analysis. Significantly, Deloitte contests the court’s findings about the cause-and-effect relationships between public disclosures and the securities’ price changes. Plaintiffs, in turn, defend the soundness of the District Court’s analysis and emphasize that the listing of DVI’s common stock and 1997 Notes on the NYSE weighs in favor of a finding of market efficiency.
Securities markets like the NYSE and the NASDAQ are “open and developed,”
see Oran v. Stafford,
Other factors may be relevant to assessing market efficiency, particularly when securities are traded in markets less open and well-developed than those of the major exchanges, but even for the major exchanges as well. The type of security (stocks, bonds, convertibles, derivatives, etc.), the company’s industry, the security’s price, and other considerations should guide district courts in deciding which factors are most relevant to an efficiency analysis.
16
However, because an efficient market is one in which “information important to reasonable investors ... is immediately incorporated into stock prices,”
Burlington,
Here, the District Court found causal relationships between disclosures about DVI and its securities’ prices. In analyzing DVI’s common stock, the court exam
*635
ined an event study conducted by plaintiffs’ expert, which found that, of the 34 days during the class period when DVI’s common stock- saw significant price changes, 20 of those days coincided with news releases.
See DVI,
On appeal, Deloitte makes two primary arguments related to cause-and-effect. First, it contests whether 60% and 65% correlations between news releases and price changes in DVI common stock and Notes, respectively, demonstrate an efficient market. The District Court credited two studies offered by plaintiffs, which found that on average “only about one-third of statistically significant changes in the stock price of publicly traded companies are actually associated with identifiable news or events.”
DVI,
Deloitte also contends the market price reacted too slowly to news releases about DVI to demonstrate efficiency. The court found that although DVI’s stock price sometimes took up to two days to incorporate new information, “on the vast majority of occasions the information was incorporated into the stock price on the same day.”
DVI,
We have addressed the speed with which information is incorporated into market price and explained that because a perfectly efficient market is not attainable,
cf., Peil,
In sum, the District Court weighed efficiency factors involving the markets in which DVI’s common stock and senior Notes traded. Granting weight to the listing of DVI’s stock and Notes on the NYSE, and to the cause-and-effect relationships between news releases and DVI’s securities’ prices, the court concluded that each market was efficient. The legal standards it used to evaluate efficiency were proper, its factual findings were not clearly erroneous, and its weighing of the factors was not an abuse of discretion. Accordingly, the court did not abuse its discretion *636 in permitting plaintiffs to invoke the fraud-on-the-market presumption of reliance.
2.
Deloitte urges us to adopt the view that plaintiffs must prove loss causation at the class certification stage in order to invoke the fraud-on-the-market presumption of reliance.
See Oscar Private Equity Invs. v. Allegiance Telecom, Inc.,
The
Oscar
court’s analysis hinged on the relationship between loss causation and market impact. Market impact is the effect of a disclosure on the market price. In an efficient market, every material disclosure should be reflected in the market price. Market impact is necessary to prove loss causation because a misrepresentation that does not move the market price is incapable of causing a loss.
Cf. Dura,
In
Oscar,
the court explained that because the fraud-on-the-market presumption of reliance requires an efficient market, and a disclosure that does not result in a price change suggests an inefficient market, market impact, and therefore loss causation, must go to the core of the reliance requirement.
18
See
Oscar
appears to shift the burdens announced in
Basic,
undermining the purpose of the presumption of reliance.
See
*637
In re Salomon Analyst Metromedia Litig.,
B.
Once established, the presumption of reliance may be rebutted by “any defense to actual reliance.”
Semerenko,
In a recent opinion, the Court of Appeals for the Second Circuit interpreted Basic to mean “that a successful rebuttal defeats certification by defeating the Rule 23(b)(3) predominance requirement. Hence, the court must permit defendants to present their rebuttal arguments before certifying a class....” 20 Salomon, 544 *638 F.3d at 485 (quotation and citation omitted). The Second Circuit heeded defendants’ request to “attempt to rebut the fraud-on-the-market presumption” with evidence “that the market price was not affected by the alleged misstatements,” id., by vacating the district court’s opinion and holding that defendants have the burden “to show that the allegedly false or misleading material statements did not measurably impact the market price of the security,” id. at 486 n. 9.
Evidence an allegedly corrective disclosure did not affect the market price undermines the fraud-on-the-market presumption of reliance for several reasons. “An efficient market for good news is an efficient market for bad news.”
Merck,
Even if a plaintiff could establish the market was efficient notwithstanding a lack of market impact, under our precedents the lack of market impact may indicate the misstatements were immaterial— a distinct basis for rebuttal.
See Semerenko,
Accordingly, we believe rebuttal of the presumption of reliance falls within the ambit of issues that, if relevant, should be addressed by district courts at the class certification stage. The District Court here did not err in evaluating Deloitte’s rebuttal arguments. Moreover, we agree with the Second Circuit that a defendant’s successful rebuttal demonstrating that misleading material statements or corrective disclosures did not affect the market price of the security defeats the presumption of reliance for the entire class, thereby defeating the Rule 23(b) predominance requirement.
1.
Deloitte contends on appeal that it has rebutted the presumption of reliance by showing plaintiffs cannot demonstrate loss causation for all class members. But Deloitte does not argue or demonstrate the alleged corrective disclosures did not affect the market price. Instead, Deloitte contends some “in-and-out” traders — investors who sold their securities before the first alleged corrective disclosure — suffered no loss and therefore loss causation cannot be shown for those traders rebutting the presumption of reliance. On these facts, we disagree.
As previously discussed, loss causation considered separate and apart from the presumption of reliance will rarely defeat the Rule 23(b)(3) predominance requirement because the evidence used to prove loss causation in fraud-on-the-market eases is often common to the class.
See Hydrogen Peroxide,
The parties dispute whether the first alleged corrective disclosure occurred on August 13, 2003, the day DVI announced it would file for bankruptcy protection, or on some earlier date going back to and possibly preceding May 20, 2003, the day Deloitte resigned as DVI’s certified public accountant.
21
Before the District Court, Deloitte briefed this issue as a class definition issue and not as a rebuttal to the presumption of reliance. Citing
Dura,
the court recognized that persons who sold their securities before the first corrective disclosure would face a difficult task of establishing damages and therefore also of loss causation, but declined to narrow the class dates, holding this a factual question that need not be addressed at the class certification stage.
DVI,
At bottom, Deloitte urges us once again, albeit under a different legal theory, to require the District Court to rule on the earliest date a corrective disclosure occurred- — -a ruling that on its face does not implicate predominance because it would be made using evidence common to the class.
See Hydrogen Peroxide,
Although
Basic
permits rebuttal of the presumption of reliance, it places the burden of rebuttal on defendants.
See Basic,
2.
Defendants also introduced rebuttal evidence before the District Court contending that lead plaintiffs relied on non-public information rather than on the integrity of the market price. 24 On appeal, Deloitte reiterates its argument that lead plaintiffs’ investment strategy was to capitalize on inefficiencies in the small-cap market by trading securities it believed, based on public information and information received from DVI, were incorrectly priced. In essence, Deloitte argues that because plaintiffs hoped to be successful arbitrageurs they could not have relied on the integrity of the market price and the presumption of reliance is therefore rebutted defeating predominance.
The District Court examined and rejected evidence that lead plaintiffs relied on inside information from DVI in making trades. Before the District Court, Deloitte contended research notes taken by or attributed to Kenneth Grossman demonstrated lead plaintiffs’ receipt of material non-public information from DVI management on numerous occasions,
25
which
*641
were correlated with lead plaintiffs’ trades in DVI securities. The court reviewed plaintiffs’ comparison of the description of each research note with information publicly available as of the date of the research note, and made a factual finding “that the communications from DVI insiders were either immaterial or publicly available, having been disclosed through public conference calls, press releases, SEC filings or other publicly available materials.”
DVI,
Because Deloitte has not proffered evidence lead plaintiffs received and traded on material, non-public, information, Deloitte’s contention is limited to the naked argument that evidence an investor believes successful arbitrage is possible rebuts the presumption of reliance. Deloitte essentially argues that a subjective belief the market is not perfectly efficient is sufficient to demonstrate plaintiffs did not rely on the integrity of the market price. In support, Deloitte cites
Zlotnick v. TIE Communications,
In
Basic,
the Court explained that “a free and open public market” is based on “a situation where the market price reflects as nearly as possible a just price.”
Accordingly, for the foregoing reasons, we will affirm the order of the District Court.
III.
Plaintiffs appeal the District Court’s denial of class certification with respect to Clifford Chance. Because this appeal raises different issues than those presented in Deloitte’s appeal, a brief summary of the factual allegations may be helpful. On October 11, 2002, Deloitte issued a Management Letter in connection with its annual audit of DVI. The letter identified material weaknesses in DVI’s internal controls for monitoring non-performing assets and assessing impaired loans. Deloitte informed DVI that federal securities laws— the Sarbanes-Oxley Act of 2002(SOX), Pub.L. No. 107-204, 116 Stat. 745, in particular — required disclosure of these weaknesses in DVI’s next Form 10-Q. According to plaintiffs, disclosing this information would have forced DVT to write down millions of dollars of assets and reverse income accrued on impaired loans. DVI initially prepared a portion of the 10-Q for the quarter ending September 30, 2002, revealing the material weaknesses and faxed it to John Healy, a partner at Clifford Chance. Healy allegedly directed DVI not to release that version of the 10-Q. Instead, according to plaintiffs, Healy devised a “workaround” scheme to avoid having to disclose the weaknesses. 27 The parties dispute Clifford Chance’s role in drafting the misleading portions of the 10-Q, 28 but they do not dispute that the final version did not state there were material weaknesses in DVI’s internal controls.
The Fifth Amended Complaint asserts violations of Rule 10b-5(a) and (c), but not Rule 10b — 5(b), against Clifford Chance. Fifth Am. Compl. ¶ 560. As noted, subsections (a) and (c) make fraudulent conduct unlawful; subsection (a) makes it unlawful “[t]o employ any device, scheme, or artifice to defraud,” 17 C.F.R. § 240.10b-5(a); subsection (c) makes it unlawful “[t]o engage in any act, practice, or course of business which operates or would operate as a fraud,”
id.
§ 240. 10b — 5(c). In contrast, subsection (b) makes it unlawful “[t]o make any untrue statement of materi
*643
al fact” or to omit a material fact necessary to clarify prior misleading statements.
Id.
§ 240. 10b — 5(b). Consequently, the District Court only addressed plaintiffs’ scheme liability claims under subsections (a) and (c).
29
It explained: “Lead Plaintiffs do not allege that Clifford Chance directly made any public misstatements that affected the market for DVI securities. Instead, Lead Plaintiffs argue that Clifford Chance should be held liable under section 10(b) because it participated in a scheme to defraud investors] in DVI.”
DVI,
As discussed in Part II.A.
supra,
to invoke the fraud-on-the-market presumption of reliance, plaintiffs must show they traded securities in an efficient market,
Semerenko,
On appeal, plaintiffs renew their arguments. They also argue Clifford Chance’s deceptive conduct was communicated to the public, and that Stoneridge only requires public dissemination of the fraudulent acts, not public attribution of the acts to a particular defendant. 30
*644
Our analysis of plaintiffs’ scheme liability claims is guided by a number of Supreme Court decisions. In 1971, the Court found a private right of action to be implicit in § 10(b) and Rule 10b-5. See
Superintendent of Ins. of N.Y. v. Bankers Life & Cas. Co.,
More than twenty years after
Superintendent,
the Court resolved uncertainty regarding from whom plaintiff-investors can recover in securities fraud actions, restricting the scope of private actions under the statute. It held that “a private plaintiff may not maintain an aiding and abetting suit under § 10(b).”
Cent. Bank of Denver, N.A. v. First Interstate Bank of Denver, N.A.,
Any person or entity, including a lawyer, accountant, or bank, who employs a manipulative device or makes a material misstatement (or omission) on which a purchaser or seller of securities relies *645 may be liable as a primary violator under 10b-5, assuming all of the requirements for primary liability under Rule 10b-5 are met.
Id.
Two issues have arisen in private litigation following
Central
Bank,
31
First, there is uncertainty among the circuits as to how to differentiate primary and secondary liability.
Compare Pac. Inv. Mgmt. Co. v. Mayer Brown LLP (Refco),
Second, during the past fifteen years, many plaintiffs have also advanced “scheme liability” claims under Rule 10b-5(a) and (c) to reach secondary actors, who may have been integrally involved in furthering the fraudulent scheme, but who made no public statements. The essence of these claims is that even though secondary actors may not themselves have made actionable misrepresentations, they are nevertheless liable for primary violations of § 10(b) through their deceptive acts. This was the issue in
Stoneridge,
where plaintiffs, purchasers of common stock in Charter Communications, Inc., alleged that Seientific-Atlanta and Motorola, vendors of Charter, knowingly entered into sham transactions with Charter that allowed the company to book fictitious revenues.
The Supreme Court affirmed, but rejected a narrow definition of “deceptive acts,” making clear that “[c]onduct itself can be deceptive.”
Stoneridge,
In all events we conclude respondents’ deceptive acts, which were not disclosed to the investing public, are too remote to satisfy the requirement of reliance. It was Charter, not respondents, that misled its auditor and filed fraudulent financial statements; nothing respondents did made it necessary or inevitable for Charter to record the transactions as it did.
Id.
at 161,
Plaintiffs make two arguments with respect to their scheme liability claims. First, they argue the District Court erroneously interpreted
Stoneridge
to bar all scheme liability claims where the deceptive conduct was not publicly disclosed. They read
Stoneridge
to have created a “remoteness test” that requires district courts to assess (1) the level of the secondary actor’s involvement in the scheme,
see id.
at 161,
The Second Circuit recently addressed this argument in
Refco,
a case with facts analogous to those presented here. The litigation arose from the demise of Refco, a large “provider[ ] of brokerage and clearing services in the international derivatives, currency, and futures markets.”
Refco,
We too read
Stoneridge
to preclude plaintiffs’ invocation of the fraud-on-the-market presumption of reliance. The Court’s statement that defendants’ conduct was “too remote to satisfy the requirement of reliance,”
Stoneridge,
Moreover, no alleged act by Clifford Chance made it necessary for DVI to file the misleading 10-Q. Even assuming Clifford Chance developed the workaround to avoid disclosure of DVI’s material weaknesses, and DVI would have issued a truthful 10-Q if the law firm did not present this alternative, it was still DVI, not Clifford Chance, that filed it.
See Refco,
Second, plaintiffs attempt to establish the fraud-on-the-market presumption of reliance is available to them under
Stoneridge
by arguing that Clifford Chance’s deceptive conduct was actually publicly disclosed — a necessary prerequisite of the reliance presumption.
See id.
at 159,
Plaintiffs in
Refco
also made this argument in an attempt to distinguish
Stoneridge.
But just as the Second Circuit held that a secondary actor can be liable in a private action under Rule 10b-5(b) only for misstatements attributed to that actor, it also required attribution to invoke the fraud-on-the-market presumption in a scheme liability action under Rule 10b-5(a)
*648
and (c).
See Refco,
We agree with the Second Circuit and hold that in order for a plaintiff to invoke the fraud-on-the-market presumption of reliance against a secondary actor in a scheme liability action under § 10(b), the plaintiff must show the deceptive conduct was publicly attributed to that secondary actor.
33
See also Affco Invs. 2001 LLC v. Proskauer Rose L.L.P.,
Our decision conforms with both
Central Bank
and Congress’s response to the decision, which gave only the SEC authority to bring actions against individuals for aiding and abetting.
See
15 U.S.C. § 78t(e). “If
Central Bank’s
carefully drawn circumscription of the private right of action is not to be hollowed ... courts must be vigilant to ensure that secondary violations are not shoehorned into the category reserved for primary violations.”
SEC v. Tambone,
*649 We hold that a plaintiff cannot invoke the fraud-on-the-market presumption of reliance in a private action under Rule 10b-5(a) and (c) unless the deceptive conduct has been publicly disclosed and attributed to the actor. Here, because plaintiffs do not contend Clifford Chance’s alleged role in masterminding the fraudulent 10-Q was disclosed to the public, they cannot invoke the presumption. Accordingly, their claim against the law firm cannot be certified as a class action because individual issues of reliance predominate.
IV.
For the foregoing reasons, we will affirm the judgment of the District Court.
Notes
. The extent of the Notes’ similarities is disputed by the parties. See infra n. 15.
. Cedar Street Fund is a limited partnership that invests in small- and mid-cap stocks. Cedar Street Offshore Fund is a Cayman Islands tax-exempt company that invests in the same manner as Cedar Street Fund. According to the funds' promotional materials, the minimum investment is $1 million. Gross-man was a managing member of and 50% shareholder in Cedar Street Fund’s General Partner, SG Capital Management, LLC, and a director of the offshore fund. Plaintiffs’ investment strategies and their relationship with DVI insiders are disputed, and we discuss them in greater detail in Part II.B., infra.
. The District Court appointed the three investors as lead plaintiffs and consolidated various similar cases.
. Other parties against whom plaintiffs allege a § 10(b) claim in the Fifth Amended Complaint include: (1) officers and directors of DVI; (2) Dolphin Medical Inc., PresGar Imaging, LLC, OnCure Medical Corp., and Rad-net Management, Inc., which were each closely associated with DVI; and (3) Merrill Lynch & Co., Inc., a financial advisor to DVI, an underwriter in many of its securitization transactions, and a substantial lender to the company. Plaintiffs also assert claims under § 20(a) of the Exchange Act of 1934, 15 U.S.C. § 78t(a), against DVI’s officers and directors, Thomas Pritzker and other Pritzker family members, and Pritzker Organization LLC, each of whom allegedly exerted influence over DVI and/or its officers and directors through their substantial holdings in DVI common stock and Notes. All the defendants other than Deloitte and Clifford Chance have either settled their disputes or voluntarily opted out of these appeals.
. Unlike plaintiffs’ claims against Deloitte and other defendants, which were asserted under Rule 10b-5(a), (b), and (c), Fifth Am. Compl. ¶¶ 493, 522, 541, their claims against Clifford Chance are asserted only under Rule 10b-5(a) and (c), id. ¶ 560, which make it unlawful to "employ any device, scheme, or artifice to defraud,” and to "engage in any act, practice, or course of business which operates ... as a fraud,” respectively, 17 C.F.R. § 240.10b-5. We discuss the specific factual allegations plaintiffs make against Clifford Chance in Part III, infra.
. The District Court exercised jurisdiction under 15 U.S.C. § 78aa and 28 U.S.C. § 1331. We granted the Rule 23(f) petitions and have jurisdiction to decide the merits of these interlocutoiy appeals under 28 U.S.C. § 1292(e).
. "We review a class certification order for abuse of discretion.”
In re Hydrogen Peroxide Antitrust Litig.,
. Some of Deloitte’s arguments to rebut the presumption of reliance implicate typicality, and this is how the District Court analyzed them. See In re DVI, Inc. Sec. Litig., 249 F.R.D. 196, 202-03 (E.D.Pa.2008). On appeal, Deloitte limits its arguments to the Rule 23(b) predominance requirement, and does not contest the District Court's typicality findings.
. Section 10(b) makes it:
unlawful for any person, directly or indirectly, by the use of any means or instrumentality of interstate commerce or of the mails, or of any facility of any national securities exchange ... [t]o use or employ, in connection with the purchase or sale of any security ... any manipulative or deceptive device or contrivance in contravention of such rules and regulations as the Commission may prescribe as necessary and appropriate in the public interest or for the protection of investors.
15 U.S.C. § 78j. Under this statute, the SEC promulgated Rule 10b-5, which makes it unlawful:
(a) To employ any device, scheme, or artifice to defraud,
(b) To make any untrue statement of a material fact or to omit to state a material fact necessary in order to make the statements made, in light of the circumstances under which they were made, not misleading, or
(c) To engage in any act, practice, or course of business which operates or would operate as a fraud or deceit upon any person, in connection with the purchase or sale of any security.
17 C.F.R. § 240.10b-5.
. The Supreme Court established another presumption of reliance in
Affiliated Ute Citizens of Utah v. United States,
. The weak form of the hypothesis assumes stock prices are independent of past performance because the market’s valuation of the security already includes all historical information; the strong form of the hypothesis assumes stock prices reflect all information, both private and public, such that even insiders cannot outperform the market.
See Schleicher,
. Private securities complaints must "specify each statement alleged to have been misleading [] [and] the reason or reasons why the statement is misleading....” 15 U.S.C. § 78u-4(b)(l). The Private Securities Litigation Reform Act codified the loss causation element of a private securities cause of action, requiring a plaintiff to "prov[e] that the act or omission of the defendant alleged to violate [a federal securities law] caused the loss for which the plaintiff seeks to recover damages.” 15 U.S.C. § 78u-4(b)(4). "[T]he general rules of pleading require that the plaintiff also
plead
[loss causation] in his complaint.”
Teachers’ Ret. Sys. of La. v. Hunter,
Complaints also must "state with particularity facts giving rise to a strong inference that the defendant acted with the required state of mind.” 15 U.S.C. § 78u-4(b)(2). "A complaint will survive ... only if a reasonable person would deem the inference of scienter cogent and at least as compelling as any opposing inference one could draw from the facts alleged.”
Tellabs, Inc. v. Makor Issues & Rights, Ltd.,
. Deloitte does not dispute the alleged misrepresentations became public.
. The District court considered efficiency factors set forth in
Cammer v. Bloom,
. The District Court also treated the two tranches — the 1997 and 1998 Notes — as one security for purposes of evaluating whether they traded in efficient markets.
DVI,
The District Court analyzed the market in which the two tranches of Notes were traded using many of the same factors it applied to DVI's common stock. On the facts here, applying the fraud-on-the-market presumption of reliance to bond holders was not clearly erroneous. See
In re Enron Corp. Sec. Derivative & ERISA Litig.,
. We have noted the
Cammer
factors may be instructive depending on the circumstances.
See Hayes v. Gross,
. This factor is related to, but broader than, loss causation. In analyzing market efficiency, courts often look to all corporate disclosures and news events. Conversely, in analyzing loss causation, courts generally look to corrective disclosures.
. In most cases, unmoored from the presumption of reliance, loss causation is unlikely to defeat class certification because it is generally susceptible of class-wide proof.
See Hydrogen Peroxide,
. In
Newton,
an atypical securities fraud action, we upheld a denial of class certification because the plaintiffs could not meet the Rule 23(b)(3) predominance requirement — plaintiffs were unable to demonstrate injury using class-wide proof.
See Newton,
. In Basic, the Court explained in a footnote: We note there may be a certain incongruity between the assumption that Basic shares are traded on a well-developed, efficient, and information-hungry market, and the allegation that such a market could remain misinformed, and its valuation of Basic shares depressed, for 14 months, on the basis of three public statements. Proof of that sort is a matter for trial, throughout which the District Court retains the authority to amend the certification order as may be appropriate. Thus, we see no need to engage in the kind of factual analysis the dissent suggests that manifests the “oddities” of applying a rebuttable presumption of reliance in this case.
. The District Court, ruling on a motion for summary judgment, subsequently held the September 25, 2002, May 13, 2002, June 5-6, 2003, and July 16, 2003, disclosures were not corrective disclosures as a matter of law.
. As a preliminary matter, we note the issue of which individuals and entities are included in the putative class is primarily relevant to class definition. Here, the in-and-out traders referenced by Deloitte are excluded from the class, which is limited by its plain terms to individuals or entities who were damaged by their purchases. We question whether the District Court conformed with Fed.R.Civ.P. 23(c)(1)(B), requiring trial courts granting a motion for class certification to "define the class and the class claims, issues, or defenses....” We recently held this rule, which was part of the 2003 amendments to Rule 23, created an affirmative duty for district courts to include a “readily discernable, clear, and complete list of the claims, issues or defenses to be treated on a class basis.”
Wachtel v. Guardian Life Ins. Co. of Am.,
. Deloitte attempts to recast a claim about damages — loss—to one about loss causation.
See Newton,
. Deloitte initially introduced this rebuttal evidence before the District Court in the context of the Rule 23(a) typicality requirement. If a unique defense might "play a major role in the litigation,” there is a risk that absent class members will suffer if class representatives do not focus on concerns common to the class.
See Beck v. Maximus, Inc.,
. Some access to company management is permissible because it facilitates the dissemi-' nation of publicly available company news, and is often inevitable when institutional investors are taking large equity stakes in companies.
See In re WorldCom, Inc. Sec. Litig.,
. The District Court applied these factual findings to the Rule 23(a) typicality requirement, which Deloitte does not contest on appeal, but they are equally applicable in the present predominance challenge.
. The term workaround was used by CFO Garfinkel in his affidavit. The specifics of the workaround are complicated, but in essence Healy’s alleged plan was to take advantage of a loophole in SOX by conducting a “special audit” of DVI’s internal controls during the two-week period following the issuance of the Management Letter, but before the deadline for filing the 10-Q. The audit was meant to show there were no material weaknesses in DVI's internal controls, which allowed DVI to avoid disclosure to the SEC under the SOX guidelines.
. Clifford Chance devotes a significant portion of its reply brief to contesting plaintiffs’ factual allegations. It contends there is no evidence showing Healy believed the Management Letter needed to be disclosed, or that any attorney at Clifford Chance drafted the 10-Q. The record appears to present some evidence to the contrary, but regardless, the resolution of these factual disputes is more appropriate at a merits stage of the proceeding. At this point, we are concerned only with whether plaintiffs’ claims involve common questions of law and fact.
See Hydrogen Peroxide,
. We refer to claims under Rule 10b-5(a) and (c) as "scheme liability claims” because they make deceptive conduct actionable, as opposed to Rule 10b-5(b), which relates to deceptive statements.
. On appeal, plaintiffs also assert Clifford Chance is liable under Rule 10b — 5(b) for actually making misstatements with respect to the aforementioned 10-Q. Presumably, this argument was made to circumvent
Stoneridge,
which was decided while the class certification motion was
sub judice.
Plaintiffs urge us to adopt a broad definition of what constitutes "mak[ing] any untrue statement of a material fact” under this subsection.
See
17 C.F.R. § 240.10b-5(b). They rely primarily on a vacated panel opinion from our Court, which held that an actor can be primarily liable when he knowingly or recklessly plays such a substantial role in the creation of the statement that he could be said to be the author of that statement.
See Klein v. Boyd,
Plaintiffs waived their Rule 10b-5(b) theory of recovery when they failed to raise it before the District Court.
See Srein v. Frankford Trust Co.,
Plaintiffs also contend the
Affiliated Ute
presumption of reliance — a presumption that can be invoked when a duty to disclose material information has been breached,
see
. After Central Bank, Congress amended the Exchange Act to permit the SEC to bring enforcement actions against any person that "knowingly provides substantial assistance to another person in violation of [the Act],” PSLRA, Pub.L. No. 104-67, § 104, 109 Stat. 737, 757 (codified in 15 U.S.C. § 78t(e)), but did not reverse the Court’s holding with respect to private actions.
. In support of their remoteness test argument, plaintiffs rely only on cases where defendants were corporate insiders as opposed to secondary actors such as outside counsel.
See Pugh v. Tribune Co.,
. Like the Second Circuit, our decision applies only to "parties who are not employed by the issuing firm whose securities are the subject of allegations of fraud.”
Refco,
. Without attribution, the market will not know, and therefore cannot rely on the deceptive conduct. Plaintiffs cannot use the fraud-on-the-market presumption of reliance, but they may still have the opportunity to prove actual reliance on a secondary actor’s conduct.
. We recognize that an attribution requirement may allow some secondary actors to escape liability simply by engaging in all conduct behind closed doors. We also agree with the Second Circuit’s acknowledgment that "it is somewhat unclear how the deceptive conduct of a secondary actor could be communicated to the public and yet remain 'deceptive.' ”
Refco,
