PX1NR on Euronext Paris

CAC 40

Blue chip stock market index

The CAC 40 (French pronunciation: [kak kaʁɑ̃t]) (Cotation Assistée en Continu) is a benchmark French stock market index. The index represents a capitalization-weighted measure of the 40 most significant stocks among the 100 largest market caps on the Euronext Paris (formerly the Paris Bourse).2 From Wikipedia, CC BY-SA 4.0

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Last updated Oct 16, 2026.

Overview

Dec 31, 1987Founded1

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CAC40 1965-18-03-2020
Photo: Touchatou, CC BY-SA 4.0, via Wikimedia Commons3

The CAC 40 (French pronunciation: [kak kaʁɑ̃t]) (Cotation Assistée en Continu) is a benchmark French stock market index. The index represents a capitalization-weighted measure of the 40 most significant stocks among the 100 largest market caps on the Euronext Paris (formerly the Paris Bourse). It is a price return index. It is one of the main national indices of the pan-European stock exchange group Euronext alongside Euronext Amsterdam's AEX, Euronext Brussels' BEL20, Euronext Dublin's ISEQ 20, Euronext Lisbon's PSI-20 and the Oslo Bors OBX Index.2

How it started

History

The CAC 5 and the CAC 40 take their name from the Paris Bourse's early automation system Cotation Assistée en Continu (Continuous Assisted Quotation). CAC 5, inaugurated on 23 June 1986, was a version of the Toronto Computer Assisted Trading System, the first fully automated trading system. CAC 5 consisted of Leroy-Somer, LVMH, Synthélabo, Eurocom and UCB. CAC 40's base value of 1,000 was set on 31 December 1987, equivalent to a market capitalisation of 370,437,433,957.70 French francs. On 1 December 2003, the index's weighting system switched from being dependent on total market capitalisation to free float market cap only, in line with other leading indices.

From Wikipedia’s article on CAC 40, shared under CC BY-SA 4.0.2

Subsidiaries and ownership

Owners

From Wikidata.1

Timeline

  1. Dec 31, 1987Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

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