The two primary federal laws governing securities are the Securities Act of 1933 and the Securities Exchange Act of 1934, which are are covered in separate articles.
Trust Indenture Act of 1939
This Act applies to debt securities such as bonds, debentures, and notes that are offered for public sale. Even though such securities may be registered under the Securities Act, they may not be offered for sale to the public unless a formal agreement between the issuer of bonds and the bondholder, known as the trust indenture, conforms to the standards of this Act. The full text of this Act is available at: http://uscode.house.gov/download/pls/15C2A.txt (Subchapter III). (Please check the Classification Tables maintained by the US House of Representatives Office of the Law Revision Counsel for updates to any of the laws.)
Investment Company Act of 1940
This Act regulates the organization of companies, including mutual funds, that engage primarily in investing, reinvesting, and trading in securities, and whose own securities are offered to the investing public. The regulation is designed to minimize conflicts of interest that arise in these complex operations. The Act requires these companies to disclose their financial condition and investment policies to investors when stock is initially sold and, subsequently, on a regular basis. The focus of this Act is on disclosure to the investing public of information about the fund and its investment objectives, as well as on investment company structure and operations. It is important to remember that the Act does not permit the SEC to directly supervise the investment decisions or activities of these companies or judge the merits of their investments. The full text of this Act is available here.
Investment Advisers Act of 1940
This law regulates investment advisers. With certain exceptions, this Act requires that firms or sole practitioners compensated for advising others about securities investments must register with the SEC and conform to regulations designed to protect investors. Since the Act was amended in 1996, generally only advisers who have at least $25 million of assets under management or advise a registered investment company must register with the Commission. The full text of this Act is available here.
Sarbanes-Oxley Act of 2002
On July 30, 2002, President Bush signed into law the Sarbanes-Oxley Act of 2002, which he characterized as "the most far reaching reforms of American business practices since the time of Franklin Delano Roosevelt." The Act mandated a number of reforms to enhance corporate responsibility, enhance financial disclosures and combat corporate and accounting fraud, and created the "Public Company Accounting Oversight Board," also known as the PCAOB, to oversee the activities of the auditing profession. The full text of the Act is available here. You can find links to all Commission rulemaking and reports issued under the Sarbanes-Oxley Act at: http://www.sec.gov/spotlight/sarbanes-oxley.htm.