406 U.S. 128 (U.S. Supreme Court 1972)
Affiliated Ute Citizens is a landmark Supreme Court case in federal securities law, most famous for carving out a critical evidentiary shortcut in Rule 10b-5 cases centered on omissions. When a defendant with a duty to disclose fails to reveal material information in connection with a securities transaction, the Court held that plaintiffs need not offer positive, individualized proof of reliance; materiality of the withheld information suffices to establish the causal link required for liability.
In a Rule 10b-5 action primarily based on the defendants' failure to disclose material facts in a fiduciary or similar relationship, must plaintiffs prove positive reliance, and did the bank employees' omission-based conduct constitute a deceptive practice "in connection with" the purchase or sale of a security?
Section 10(b) of the Securities Exchange Act of 1934 and SEC Rule 10b-5 prohibit employing any device, scheme, or artifice to defraud; making any untrue statement of a material fact or omitting to state a material fact necessary to make statements made not misleading; or engaging in any act, practice, or course of business that operates as a fraud or deceit upon any person, in connection with the purchase or sale of any security. In cases primarily involving a failure to disclose by one with a duty to speak, plaintiffs are not required to prove positive reliance; materiality of the withheld information and the existence of the duty to disclose establish the requisite causal connection. Damages are generally measured by the out-of-pocket rule (the difference between the fair value of what the seller parted with and the price received).
The certificates were securities, the bank employees' omission of material facts in the course of facilitating sales violated Rule 10b-5, and in such omission-based cases positive proof of reliance is not a prerequisite to recovery. The Supreme Court reversed the court of appeals in relevant part and remanded for the calculation of appropriate damages consistent with the out-of-pocket measure. It did not impose Rule 10b-5 liability on the United States.
Affiliated Ute is foundational for the "omissions" branch of Rule 10b-5 jurisprudence. It created the Affiliated Ute presumption of reliance, relieving plaintiffs of proving individualized reliance when defendants with a duty to disclose omit material facts. This presumption complements the later fraud-on-the-market presumption in misrepresentation cases and has become a central doctrinal tool in class certification and merits analysis. The case also illustrates fiduciary-based disclosure duties for intermediaries who create or manage a market in securities, and it reinforces the Exchange Act's broad coverage of unconventional instruments. For law students, Affiliated Ute is essential for understanding how courts distinguish between omission and misrepresentation cases, allocate evidentiary burdens, and measure damages in private 10b-5 actions.