[2] Trading on options and futures contracts on the IBEX 35 is provided by MEFF (Mercado Español de Futuros Financieros), another subsidiary of BME.

[5] Between 2000 and 2007, the index outperformed many of its Western peers,[6] driven by relatively strong domestic economic growth which particularly helped construction and real estate stocks.

[7] Consequently, while the record highs to date of the FTSE 100, CAC 40 and AEX, for example, were set during the dot-com bubble in 1999 and 2000, the IBEX 35's all-time maximum of 15,945.70 was reached on November 8, 2007.

[8][9] The financial crisis of 2007–2008 included extreme volatility in the markets, and saw both the biggest one day percentage fall and rise in the IBEX 35's history.

[11] The composition of the IBEX 35 is reviewed twice per year (in June and December)[12] by the so-called Technical Advisory Committee, which consists of "representatives of the stock exchanges and derivatives markets, as well as... renowned experts from the academic and financial fields".

[12] If any changes are made, they come into effect the following trading day after the third Friday of the rebalance month[13][12] In general, at each review, the 35 companies with the highest trading volume in Euros over the previous six months are chosen for inclusion in the index, provided that the average free float market capitalization of the stock is at least 0.3% of the total market cap of the index.

[12] The market cap used to calculate the weighting of each constituent is multiplied by a free float factor (ranging from 0.1 to 1) depending on the fraction of shares not subject to block ownership.

IBEX Mini futures contracts are traded on the MEFF Renta Variable (MEFF-RV) exchange under the ticker symbol BIBX.