The IBEX 35 is the benchmark stock market index of the Bolsa de Madrid, Spain's main stock exchange. It is a capitalization-weighted index that tracks the performance of the 35 most liquid and highly capitalized Spanish companies listed on the exchange. The companies included in the IBEX 35 are selected based on strict criteria, including market capitalization, liquidity, and representation of different economic sectors. The index is calculated based on the total return of the 35 constituent stocks, which includes both price changes and dividends. The IBEX 35 is widely used as a barometer of the Spanish stock market and is considered a key indicator of the country's economic performance. The index is updated regularly to reflect changes in the market and the financial performance of its constituent companies.

The IBEX 35 is the benchmark stock market index of Spain, representing the 35 most liquid and largest companies listed on the Spanish stock exchange, Bolsa de Madrid. Established in 1992, it serves as a key indicator of the performance of the Spanish economy and is one of the main indices in Europe.

The index is weighted by market capitalization, meaning companies with larger market values have a more significant impact on the index's movement. It includes companies from various sectors, such as banking, telecommunications, energy, and construction. Notable constituents often include firms like Banco Santander, Telefónica, and Iberdrola.

The IBEX 35 is widely followed by investors and analysts to gauge the health of the Spanish equity market.