SEC v. Geon Industries, Inc.

United States Court of Appeals for the Second Circuit · 1976 · Corporations

531 F.2d 39 (2d Cir. 1976)

Updated August 22, 2026

CorporationsSecurities RegulationRule 10b-5Insider TradingDisclosureBroker-Dealer Supervisiontippingmaterial nonpublic information

Facts

Geon was engaged in preliminary but advancing merger discussions with Burmah Oil, and Geon's CEO, Neuwirth, privately mentioned merger-related information to Roy Alpert and, as the district court inferred from circumstantial evidence, to broker Rauch, who then heavily traded Geon stock. Later, after Geon's officers discovered serious year-end earnings problems that could defeat Burmah's obligation to buy, Amex called Geon's financial vice president Bloom about unusual sell orders and asked whether anything about the Burmah deal accounted for them. Bloom denied that anything about the deal explained the orders and said Geon had no announcement to make, although he knew of unverified but potentially serious information threatening the merger. On the same morning Rauch, McMahon, Rosenfeld, and others at Edwards & Hanly sold Geon shares before trading was halted.

Issue

Whether Neuwirth's private disclosures about the Burmah merger were sufficiently supported and material to constitute unlawful tipping under Rule 10b-5; whether Bloom violated Rule 10b-5 by failing to answer Amex's inquiries fully and fairly; and whether Edwards & Hanly should be enjoined for Rauch's misconduct despite the district court's finding of reasonable supervision.

Rule

Circumstantial evidence may support an inference that a corporate insider tipped nonpublic information. For merger information, materiality under Rule 10b-5 depends on balancing the probability the transaction will occur against its anticipated magnitude in light of the company's overall activity; because a cash-out merger ending a small company's separate existence is extraordinarily significant, inside information about it may become material at an earlier stage than lesser transactions. A corporate officer responding to a stock exchange's inquiry must not give answers that are false or misleading by omission; if the exchange asks pointed questions needed to decide whether to suspend trading, the officer must respond fully and fairly even though the company might not yet be required to make a public announcement. A brokerage firm is not to be enjoined on these facts absent sufficient proof that it failed reasonably to supervise the representative, and the court declined to extend respondeat superior to require an injunction where supervision was adequate.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

Sierra Relay Systems, a small public company based in Boise, has begun discussions with a large Canadian buyer about a cash acquisition that would end Sierra Relay’s separate existence. Before any term sheet is signed, Sierra Relay’s chief executive tells his friend Nina Park in Portland that he is traveling to Toronto to meet people about a possible deal, and Nina promptly buys shares.

If the SEC later alleges unlawful tipping under Rule 10b-5, which is the strongest argument that the information was material?

Explanation. The majority held that merger materiality is assessed by balancing probability against magnitude. Where the transaction would effectively end a small company’s separate existence, magnitude is so great that information may become material earlier than with lesser transactions. The court rejected any automatic rule and also distinguished tipping materiality from mandatory public reporting obligations.