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November 9, 2021

Insider Trading

Insider-trading law has been shaped by competing
institutional forces and theoretical perspectives. While the
Securities and Exchange Commission (SEC) and federal
prosecutors have pushed for broad theories of liability
rooted in the value of equal access to information, the
courts have implemented a narrower framework predicated
on fiduciary duty and fraud. Congress, however, has not
weighed in on this back-and-forth. Despite the attention
insider trading attracts, legislators have not enacted a
statutory definition for the offense. Its elements are instead
the product of judicial decisionmaking, with SEC rules
supplementing the core prohibition. Nevertheless, recent
Congresses have shown increasing interest in insider
trading, featuring several bills that would codify the
elements of the offense and fill perceived gaps in existing
doctrine. This In Focus provides an overview of insider-
trading law and recent efforts at legislative reform.
The Evolution of Insider-Trading Law
Origins
The modern insider-trading prohibition is grounded in
Section 10(b) of the Securities Exchange Act and SEC Rule
10b-5. Those provisions impose broad prohibitions of fraud
in connection with securities transactions, but do not
explicitly mention insider trading. Nevertheless, the courts
and regulators have constructed a complex legal regime on
top of this modest textual foundation.
The story begins in 1961, when the SEC first deployed Rule
10b-5 to tackle open-market trading on the basis of inside
information. In that year, the Commission settled an
administrative enforcement action against a brokerage-firm
partner who sold shares of the Curtiss-Wright Corporation
after learning of an impending dividend cut from one of the
corporation's directors. The enforcement action-In re
Cady, Roberts & Co.-marked the SEC's first articulation
of what became known as the disclose or abstain rule,
under which persons with special access to a corporation's
material nonpublic information must either disclose such
information or abstain from trading the corporation's
securities.
While Cady, Roberts represented a notable expansion of
Rule 10b-5, the Second Circuit accepted the SEC's position
seven years later in SEC v. Texas Gulf Sulphur Co. The
case offers a common insider-trading fact pattern: after a
mining company discovered promising mineral deposits-
but before it announced the discovery-several insiders
bought the company's shares and options to acquire its
shares. The Second Circuit embraced the SEC's view that
this conduct violated Rule 10b-5. In doing so, the court
articulated a broad theory of insider-trading liability

premised on the notion that all investors should have equal
access to material information about the securities they
trade. Although the defendants in Texas Gulf were insiders,
the court's opinion did not limit the disclose or abstain
rule to a corporation's officers, directors, and agents.
Instead, the Second Circuit explained that the requirement
applied to anyone in possession of material nonpublic
information-regardless of their relationship to the
securities issuer.
The Supreme Court Alters the Approach
The equal-access gloss on Rule 10b-5 did not last. In 1980,
the Supreme Court rejected that theory in Chiarella v.
United States. The case involved an employee of a financial
printer that prepared tender-offer documents for acquirers.
Based on information in these documents, the employee
identified firms that were being targeted for acquisition and
purchased their shares before the bids were announced. The
employee thus clearly traded on the basis of material
nonpublic information. Nevertheless, he was not an insider
of the targeted firms, nor did his employer-which served
the acquirers-have any special relationship with them. In
Chiarella, the Court reversed the employee's insider-
trading conviction based on the absence of such a
relationship. According to the Court, a trader's failure to
disclose a material fact is fraudulent-and therefore
violates Rule lOb-5-only if the trader has a duty to
disclose the fact. There is no such duty, however, absent a
fiduciary or other similar relation of trust and confidence.
While the Court acknowledged that corporate insiders owe
fiduciary duties to buyers and sellers of their companies'
shares, it concluded that the defendant in Chiarella had no
such relationship with the shareholders of the targeted
firms. The Court therefore reversed the defendant's
conviction because the trial court's jury instructions
improperly allowed for a conviction without a finding of
the requisite relationship.
In rejecting the equal-access model from Texas Gulf,
Chiarella sets forth the basic contours of what has been
called the classical theory of insider-trading liability,
under which corporate insiders who trade on material
nonpublic information violate Rule 10b-5 by breaching a
duty to their counterparties (buyers or sellers). The decision
explicitly declined to consider an alternative theory, under
which persons who trade on material nonpublic information
can violate Rule 10b-5 by breaching a duty to the source of
the information (in Chiarella, the acquirers that had
retained the defendant's printing firm). This
misappropriation theory would remain in limbo until
the Supreme Court embraced it in its 1997 decision in
United States v. O'Hagan. In that case, a partner at a law
firm representing an acquirer in a takeover bid purchased

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