The IBEX 35 (Iberia Index) is a capitalization-weighted stock market index, comprised of the 35 most liquid Spanish stocks traded in the continuous market, and is the benchmark index for the Bolsa de Madrid, the Madrid stock-exchange. MEFF (Mercado Español de Futuros Financieros) is Spain's screen-based derivatives market, trading futures and options on the IBEX-35 index.