Which of the following acts protects investors with full and fair disclosure of new securities issues?

The Securities Act of 1933 is designed to ensure that investors receive full and fair disclosure regarding new securities offerings. This act mandates that companies provide detailed information about the investment, including financial statements, risks involved, and how the proceeds from the sale will be used. The goal is to facilitate informed decision-making by potential investors, thereby promoting transparency and reducing the potential for fraud in the securities market.

In contrast, other acts like the Securities Exchange Act of 1934 primarily focus on regulating the trading of securities already issued and ensuring that ongoing disclosures by public companies meet specific standards. The Trust Indenture Act of 1939 pertains to the agreements between bond issuers and bondholders, primarily dealing with the debt securities' trust indentures. The Investment Company Act of 1940 regulates investment companies, providing guidelines on their operations to protect investors, but it does not directly focus on the disclosure of new issuances like the 1933 Act does. Therefore, the Securities Act of 1933 is the correct choice for protecting investors through full and fair disclosure of new securities issues.