Final answer:
The full disclosure of information pertinent to a new security issue is required by the Securities Act of 1933, which aims to protect investors by ensuring they have access to all material information about securities offered for public sale.
Step-by-step explanation:
The requirement to provide full disclosure of all information pertinent to a new security issue was mandated under the Securities Act of 1933. This act established legal standards for disclosure to help protect investors and restore confidence in the financial markets following the stock market crash of 1929 and the Great Depression. The act aimed to ensure that investors have access to all material information about securities being offered for public sale. Furthermore, the enactment of the Securities and Exchange Commission (SEC) due to this and subsequent legislation helped to regulate the investment industry and prevent fraudulent activities in the securities markets.