426 U.S. 438 (1976)
TSC Industries, Inc. v.
What is the appropriate standard for determining the materiality of omitted information in securities disclosures?
An omitted fact is material if there is a substantial likelihood that a reasonable shareholder would consider it important in deciding how to vote. The materiality of an omitted fact must be gauged by its significance, given the total mix of information available.
The Supreme Court held that a fact is material if there is a substantial likelihood that its disclosure would have been viewed by the reasonable investor as having significantly altered the 'total mix' of information made available.
The TSC Industries v. Northway decision is pivotal in securities law as it clarified the definition of materiality, impacting how companies approach disclosures. The 'total mix' standard provided a clearer guideline for assessing when omissions or misstatements in securities filings may lead to liability under federal securities laws. This case continues to influence both litigation strategies and compliance approaches, ensuring that investors receive significant information necessary for informed decision-making without being inundated with insignificant data.