Investment Company Act of 1940

The Investment Company Act of 1940 is an act of Congress. It was passed as a United States Public Law (Pub.L. 76–768) on August 22, 1940, and is codified at 15 U.S.C. §§ 80a-1–80a-64. Along with the Securities Exchange Act of 1934 and Investment Advisers Act of 1940, and extensive rules issued by the Securities and Exchange Commission, it forms the backbone of United States financial regulation. It has been updated by the Dodd-Frank Act of 2010. Often known as the Investment Company Act, the 1940 Act or simply the '40 Act, it is the primary source of regulation for mutual funds and closed-end funds, an investment industry now in the many trillions of dollars. In addition, the '40 Act impacts the operations of hedge funds, private equity funds and even holding companies.

Following the founding of the mutual fund in 1924, investors welcomed the innovation with open arms and invested in this new investment vehicle heavily. Five and a half years later, the Wall Street Crash of 1929 occurred in the , followed shortly thereafter by the United States entry into the Great Depression. In response to this crisis, the United States Congress wrote into law the Securities Act of 1933 and the Securities Exchange Act of 1934 in order to regulate the securities industry in the interest of the public.