{"id":1812953,"date":"2015-11-08T11:35:20","date_gmt":"2015-11-08T10:35:20","guid":{"rendered":"https:\/\/www.newzyexecutive.fr\/le-cac-40-comment-ca-fonctionne\/"},"modified":"2026-05-04T09:52:26","modified_gmt":"2026-05-04T08:52:26","slug":"le-cac-40-comment-ca-fonctionne","status":"publish","type":"post","link":"https:\/\/www.newzyexecutive.fr\/en\/le-cac-40-comment-ca-fonctionne\/","title":{"rendered":"Understanding the CAC 40: How does it work?"},"content":{"rendered":"

Everyone has asked themselves at least once: how does the CAC 40 actually work?! This stock market index, which provides the data telling us whether we are gaining or losing; this index that governs the markets and to which industrialists and top executives pay particular attention\u2014what does it mean in concrete terms? Here is an explanation.<\/strong><\/p>\n

Stock Index and Euronext<\/h2>\n

When discussing stock indices, we are essentially referring to a statistical measure calculated by grouping the values of shares from multiple companies. It is computed by summing the market capitalizations of its constituent companies, and this figure is then divided by a constant value to arrive at a “scaled” value. It acts as a type of barometer that analyzes market behavior and serves as a benchmark for portfolio managers. A stock index indicates the overall trend; it is the standard used to determine whether a stock market is up or down. The CAC 40 is the benchmark index for the Paris Stock Exchange.<\/p>\n

Since 2000, the Paris Stock Exchange has been renamed Euronext Paris. As such, the CAC 40 is part of Euronext, a transnational exchange that brings together the markets of Paris, Amsterdam, Brussels, and Lisbon, as well as the English derivatives market (LIFFE). It stands as Europe’s leading marketplace. Euronext is responsible for numerous operations, including ensuring market security, managing listings, and providing real-time stock price dissemination.<\/p>\n

The CAC 40<\/h2>\n

The CAC 40 is comprised of the 40 largest French companies; CAC stands for “Cotation Assist\u00e9e en Continu” (Continuous Assisted Trading). From the top one hundred companies, the 40 strongest performers are selected, which is why the same companies do not always feature in the CAC 40. Every three months, a committee of experts updates the group of 40 companies; any company that is no longer listed is replaced by a stock that meets the CAC 40 requirements. A company’s market capitalization is equal to its share price multiplied by the number of shares in its capital. The index base was set at 1,000 in 1987.<\/p>\n

The CAC 40 serves as a benchmark in the world of finance<\/a>, its largest decline was recorded following the September 11, 2001 attacks, demonstrating that external events directly impact stock prices. As the stock market is a major hub of exchange subject to massive fluctuations, it is essential to distinguish between a stock exchange (the trading of corporate securities) and a commodities exchange (the trading of physical goods).<\/p>\n

The CAC 40 is updated every 15 seconds, with publications occurring Monday through Friday from 9:00 a.m. to 5:30 p.m. The closing price is determined at 5:35 p.m. following the calculation of the equilibrium price; therefore, if a specific stock rises, the CAC 40 increases based on that stock’s weighting.<\/p>\n

The CAC 40 represents the state of the French financial market; a complete understanding of it can only be achieved through an in-depth study of how financial markets and various stock indices operate.<\/p>\n","protected":false},"excerpt":{"rendered":"

Everyone has asked themselves at least once: how does the CAC 40 actually work?! This stock index, which provides the data indicating whether the market is gaining or losing; this index that governs the markets and to which industrialists and top executives pay particular attention\u2014what does it concretely signify? Here is an explanation.<\/p>\n

Stock Indices and Euronext
\nWhen we speak of a stock index, we are essentially referring to a statistical measure calculated by grouping the values of shares from several companies. It is calculated by adding up the market capitalizations of the constituent companies. This figure is then divided by a constant value to obtain a “base” value. It acts as a sort of barometer that analyzes market behavior and serves as a comparison tool for portfolio managers. The stock index indicates the trend; it is the benchmark used to determine whether a stock exchange is up or down. The CAC 40 is the index for the Paris Stock Exchange. Since 2000, the Paris Stock Exchange has been renamed Euronext Paris. The CAC 40 is therefore part of Euronext, which is a transnational exchange grouping the markets of Paris, Amsterdam, Brussels, and Lisbon, as well as the English derivatives market (LIFFE). It is the leading European marketplace. Euronext is responsible for numerous functions: ensuring market security, managing listings, and broadcasting real-time stock prices.<\/p>\n

The CAC 40
\nThe CAC 40 is composed of the 40 largest French companies; CAC stands for “Cotation Assist\u00e9e en Continu” (Continuous Assisted Trading). From among the one hundred most significant companies, the 40 strongest values are selected, which is why the same companies do not always appear in the CAC 40. Every three months, a committee of experts updates the group of 40 companies; a company that is no longer listed is replaced by a value that meets the CAC 40 requirements. A company’s market capitalization is equal to its share price multiplied by the number of shares in the company’s capital. The base value was 1000 in 1987. The CAC 40 is a benchmark in the financial world; its largest decline was recorded following the September 11, 2001 attacks, demonstrating that external events directly influence share prices. As the stock exchange is a hub of significant trading with massive fluctuations, it is important to understand the difference between a stock exchange (trading company securities) and a commodities exchange (trading goods). The CAC 40 is updated every 15 seconds, and its publication takes place Monday through Friday from 9:00 a.m. to 5:30 p.m. The closing price is determined at 5:35 p.m. after calculating the equilibrium price; thus, if a specific value rises, the CAC 40 increases based on that value’s weighting. The CAC<\/p>\n","protected":false},"author":2,"featured_media":1812954,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[230],"tags":[322,323,324],"class_list":["post-1812953","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-finance","tag-bourse","tag-cac-40","tag-indice-boursier"],"_links":{"self":[{"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/posts\/1812953","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/comments?post=1812953"}],"version-history":[{"count":3,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/posts\/1812953\/revisions"}],"predecessor-version":[{"id":1813649,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/posts\/1812953\/revisions\/1813649"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/media\/1812954"}],"wp:attachment":[{"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/media?parent=1812953"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/categories?post=1812953"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newzyexecutive.fr\/en\/wp-json\/wp\/v2\/tags?post=1812953"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}