In this lesson, we’ll learn about materiality, a core concept for disclosure-based securities regulation.

I. The Duty to Disclose

The U.S. securities-regulation system is built around disclosure based on the assumption that full and fair disclosure is investors’ best protection. 

Sometimes, issuers are required by law to make specific disclosures. These circumstances include when securities are being offered for the first time. In other instances, issuers must make judgments about what to...