IBEX35 is the most important index for the Spanish Stock Exchange. It includes 35 leading companies registered in Spain and listed on the Madrid Stock Exchange. The only criterion for including company shares in the IBEX35 index is a high level of capitalization. Traditionally, the list of companies included is reviewed 2 times a year. Currently, a significant part of the total cost of IBEX35 is made up of banks. This index is an indicator of the overall economic situation in the country..