The S&P MERVAL Index (MERcado de VALores, lit. 'Stock Market') is the most important index of the Buenos Aires Stock Exchange. It is a price-weighted index, calculated as the market value of a portfolio of stocks selected based on their market share, number of transactions and quotation price. The base of MERVAL is set at 30 June 1986 = 0.01 Argentine pesos.
It is part of a joint-venture between S&P Dow Jones Indices and BYMA.[1]
The corporations and weighted prices that compose MERVAL are updated every three months, based on their market share during the previous period.
As of 30 July 2021, the constituent companies of the index include Aluar (aluminium smelter), BBVA Argentina (financial services), Banco Macro (financial services), Sociedad Comercial del Plata (holding), Edenor (electricity), Grupo Financiero Galicia