Mercado Abierto de Títulos Valores (Open Securities Market) was founded in 1970 after the enactment of Law 17,811, and it began operations at mid-decade.

MAE was founded in 1988. International agreements date back to 1999, when the Uruguayan Electronic Stock Exchange (BEVSA) gained access to the use of Sistema de Operaciones Electrónicas (SIOPEL) under an agreement that allowed, among other things, the technological complementation and joint operation of the software for electronic trading.

In 2000, an important agreement was signed with the Sao Paulo Stock Exchange BOVESPA and a license to use this system was granted.

Two years later, three organizations – MAE, the Chilean Electronic Stock Exchange (BEC) and BEVSA – signed a Master Agreement for the Information and Transaction Interconnection of their respective markets.

In January 2004, MAE signed a technological cooperation agreement with Mercado de Valores del Litoral (MVL), one of the most important markets of the interior of the country.