672
Opinion of the Court
which concerns the conduct of broker-dealers in over-the-counter markets. See Brief for United States 38-39. Since 1938, see 52 Stat. 1075, § 15(c)(2) has given the Commission authority to "define, and prescribe means reasonably designed to prevent, such [broker-dealer] acts and practices as are fraudulent, deceptive, or manipulative." 15 U. S. C. §78o(c)(2)(D). When Congress added this same rulemaking language to § 14(e) in 1970, the Government states, the Commission had already used its § 15(c)(2) authority to reach beyond common-law fraud. See Brief for United States 39, n. 22.16
We need not resolve in this case whether the Commission's authority under § 14(e) to "define . . . such acts and practices as are fraudulent" is broader than the Commission's fraud-defining authority under § 10(b), for we agree with the United States that Rule 14e-3(a), as applied to cases of this genre, qualifies under § 14(e) as a "means reasonably designed to prevent" fraudulent trading on material, nonpublic information in the tender offer context.17 A prophylactic
16 The Government draws our attention to the following measures: 17 CFR § 240.15c2-1 (1970) (prohibiting a broker-dealer's hypothecation of a customer's securities if hypothecated securities would be commingled with the securities of another customer, absent written consent); § 240.15c2-3 (prohibiting transactions by broker-dealers in unvalidated German securities); § 240.15c2-4 (prohibiting broker-dealers from accepting any part of the sale price of a security being distributed unless the money received is promptly transmitted to the persons entitled to it); § 240.15c2-5 (requiring broker-dealers to provide written disclosure of credit terms and commissions in connection with securities sales in which broker-dealers extend credit, or participate in arranging for loans, to the purchasers). See Brief for United States 39, n. 22.
17 We leave for another day, when the issue requires decision, the legitimacy of Rule 14e-3(a) as applied to "warehousing," which the Government describes as "the practice by which bidders leak advance information of a tender offer to allies and encourage them to purchase the target company's stock before the bid is announced." Reply Brief 17. As we observed in Chiarella, one of the Commission's purposes in proposing Rule 14e-3(a)
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