Depository receipts represent shares of a foreign company that are held in domestic custody on the foreign company's behalf. They allow investors to trade foreign securities on a domestic exchange. There are two main types: American Depository Receipts (ADRs), which are traded on U.S. markets, and Global Depository Receipts (GDRs), which are traded elsewhere. ADRs introduce foreign companies to American investors by allowing trading of the foreign company's shares on U.S. exchanges in dollar denominations. They exist in sponsored and unsponsored forms at three levels of increasing regulation and information disclosure.