The Securities and Exchange Commission plays an important role in regulating the American economy by governing financial industries. Learn the meaning and role of SEC (Securities and Exchange Commission) in the US legal system. Find out how SEC regulates the securities industry, protects investors, and enforces the law. The Securities and Exchange Commission, commonly abbreviated as SEC, is a government agency in the United States that is responsible for enforcing securities laws and regulating the securities industry. About The federal securities laws empower the Securities and Exchange Commission with broad authority over all aspects of the securities industry. The SEC’s mission is to protect investors; maintain fair, orderly, and efficient markets; and facilitate capital formation.