AEX index
 AEX index performance between 1982 and 2012 | |
| Foundation | 1983 |
|---|---|
| Operator | Euronext |
| Exchanges | Euronext Amsterdam |
| Constituents | up to 25 (1990–2025) up to 30 (since 2025) |
| Type | Large cap |
| Market cap | €850,8 billion (Begin March 2021) |
| Weighting method | Capitalization-weighted |
| Related indices | AMX index, AScX index |
| Website | www |
The AEX index, derived from Amsterdam Exchange index, is a stock market index composed of Dutch companies that trade on Euronext Amsterdam, formerly known as the Amsterdam Stock Exchange. Started in 1983, the index is composed of a maximum of 30 of the most frequently traded securities on the exchange. It is one of the main national indices of the stock exchange group Euronext alongside Euronext Brussels' BEL20, Euronext Dublin's ISEQ 20, Euronext Lisbon's PSI-20, the Oslo Bors OBX Index, and Euronext Paris's CAC 40.