[5] Application of Basic‘s “total mix” standard does not mean that pharmaceutical manufacturers must disclose
all reports of adverse events. Adverse event reports are daily events in the pharmaceutical industry; in 2009, the
FDA entered nearly 500,000 such reports into its reporting system, see FDA, Reports Received and Reports Entered
232, 108 S.Ct. 978 (quoting TSC Industries, 426 U.S., at 449, 96 S.Ct. 2126; emphasis added). For the reasons just
stated, the mere existence of reports of adverse events—which says nothing in and of itself about whether the drug is
causing the adverse events—will not satisfy this standard. Something more is needed, but that something more is not
limited to statistical significance and can come from “the source, content, and context of the reports,” supra, at 1321.
This contextual inquiry may reveal in some cases that reasonable investors would have viewed reports of adverse
[6] Moreover, it bears emphasis that § 10(b) and Rule 10b–5(b) do not create an affirmative duty to disclose any
and all material information. Disclosure is required under these provisions only when necessary “to make … state–
ments made, in the light of the circumstances under which they were made, not misleading. 17 CFR § 240.10b–5(b);
see also Basic, 485 U.S., at 239, n. 17, 108 S.Ct. 978 (“Silence, absent a duty to disclose, is not misleading under
Rule 10b–5”). Even with respect to information that a reasonable investor might consider material, companies can
more than 10 patients who had lost their sense of smell after using Zicam. Clarot told Linschoten that Matrixx had
received additional reports of anosmia. (In addition, during the class period, nine plaintiffs commenced four product
liability lawsuits against Matrixx alleging a causal link between Zicam use and anosmia.) FN11 Further, Matrixx
knew that Linschoten and Dr. Jafek had presented their findings about a causal link between Zicam and anosmia to a
national medical conference devoted to treatment of diseases of the nose.FN12 Their presentation described a patient
that, in one instance, a consumer who did not have a cold lost his sense of smell after using Zicam. More
importantly, to survive a motion to dismiss, respondents need only allege “enough facts to state a claim to
relief that is plausible on its face.” Bell Atlantic Corp. v. Twombly, 550 U.S. 544, 570, 127 S.Ct. 1955, 167
L.Ed.2d 929 (2007). For all the reasons we state in the opinion, respondents’ allegations plausibly suggest