Editing CAC 40 (section)

==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. <ref>Besanger, Serge (2024), Gagner à l'international : l'aventure Leroy-Somer, p. 94. </ref> CAC 5 consisted of Leroy-Somer, LVMH, Synthélabo, Eurocom and UCB.<ref>Les Echos, 19 june 1986.</ref> 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 franc]]s.<ref name="profile">{{cite web
 |url          = http://www.euronext.com/editorial/wide/editorial-2667-EN-FR0003500008.html?selectedMep=1
 |title        = CAC 40 index profile
 |publisher    = [[Euronext]]
 |access-date   = 2007-12-03
 |archive-url  = https://web.archive.org/web/20071209130116/http://www.euronext.com/editorial/wide/editorial-2667-EN-FR0003500008.html?selectedMep=1#
 |archive-date = 9 December 2007
 |url-status     = dead
}}</ref> On 1 December 2003, the index's weighting system switched from being dependent on total market capitalisation to [[Float (finance)|free float]] market cap only, in line with other leading indices.<ref>{{cite press release
|url=http://www.euronext.com/news/press_release/press_release-1731-EN.html?docid=59760
|title=CAC40 shift to free-float weighting: revision of free-float calculation and capping factors
|date=5 November 2003
|publisher=[[Euronext]]
|access-date=2007-12-03
|archive-date=27 May 2010
|archive-url=https://web.archive.org/web/20100527054001/http://www.euronext.com/news/press_release/press_release-1731-EN.html?docid=59760
|url-status=dead
}}</ref>