Define the CAC: A Complete Guide for Stock Investors

The CAC, which stands for Continuous Assisted Quotation, is the benchmark stock market index of the Paris Stock Exchange. As a true economic health barometer for France and Europe, it groups together the largest listed companies and attracts the constant interest of investors looking to diversify their portfolios and understand the dynamics of leading companies. This comprehensive guide details precisely what the CAC is, how it works, its composition, its specificities, and concrete solutions for investing in this key index of French finance and stock market.

Introduction to the CAC

The CAC is an acronym for Continuous Assisted Quotation. Created in 1987, it measures the performance of the 40 largest French capitalizations listed on Euronext Paris. Following the CAC allows one to evaluate the evolution of the main French stocks across various sectors such as luxury, finance, energy, healthcare, industry, or technology. Being one of the most closely watched indices in Europe, the CAC plays a central role for both individual and institutional investors seeking diversification and strategic investment.

The History of the CAC

Before the introduction of the CAC, the Paris Stock Exchange operated through discontinuous quotation systems that were poorly automated. The introduction of the CAC 40 in December 1987 revolutionized French stock market practices, transitioning to computer-assisted continuous quotation. This innovation brought more transparency, reliability, and dynamism to the Paris stock exchange. Since then, the CAC has become the primary reference for measuring the vitality of the French economy on global financial markets.

Definition and Technical Characteristics of the CAC

  • Type: Stock market index
  • Date of creation: December 31, 1987
  • Methodology: Weighted average based on the floating market capitalization of the component companies
  • Historical base: 1,000 points in 1987
  • Number of companies: 40
  • Evolution in points: Not in euros (example: 8,159.6 points on November 11, 2025)
  • Review: Composition reviewed quarterly by an expert committee

The Different Variants of the CAC

There are several versions of the CAC index:

  • CAC 40: The classic version, reflecting the price variations of the 40 component companies.
  • CAC 40 GR (Gross Return): Takes into account the reinvestment of gross dividends paid by the companies.
  • CAC 40 NR (Net Return): Integrates net dividends after tax withholdings.

Composition of the CAC: Sectors and Companies in 2025

The CAC 40 comprises the 40 largest companies listed on the Paris Stock Exchange, selected for their size and the liquidity of their shares. The selection aims to ensure balanced sectoral representation of the key economic pillars of France. These companies come from multiple sectors, ensuring immediate diversification for any investor wishing to invest in them.

  • Luxury : LVMH, Hermès
  • Industry : Schneider Electric, Airbus, Safran, Saint-Gobain
  • Energy : TotalEnergies, Engie
  • Finance - Banking and Insurance : BNP Paribas, Société Générale, AXA
  • Healthcare : Sanofi
  • Technology and Communication : Capgemini, Teleperformance
  • Consumer Goods : L’Oréal, Danone, Pernod Ricard
  • Materials and Chemicals : Air Liquide, Arkema
  • Other Sectors : Carrefour, Bouygues, Veolia, etc.

The weighting of each company depends on its float-adjusted market capitalization (the proportion of shares actually traded on the market), which implies that the same sector can have a predominant influence on the overall performance of the index.

Illustrative List of the Largest Companies in the CAC 40 as of November 11, 2025

  • Schneider Electric (Industry)
  • TotalEnergies (Energy)
  • LVMH (Luxury)
  • Airbus (Industry)
  • Air Liquide (Basic Materials)
  • Safran (Industry)
  • Sanofi (Healthcare)
  • L'Oréal (Consumer Goods)
  • BNP Paribas (Finance)
  • AXA (Insurance)

The composition of the CAC 40 can be consulted in real-time on dedicated stock information websites, the list being adjusted quarterly according to the evolution of listed companies.

How Does the CAC Work and What Is Its Calculation Method?

The CAC is expressed in points, not in euros. Its value is determined by the weighted average of the float-adjusted market capitalization of its 40 components. When a significant component of the CAC increases, the index progresses proportionally, and vice versa. To avoid over-representation of a single company, the weighting is capped at a maximum of 15% per share.

The CAC index evolves continuously based on real-time quotations of the companies, thus offering a dynamic and accurate representation of the Parisian market. For example, if the index rises from 7,000 to 8,000 points, it reflects an average increase in the valuation of the largest French companies.

Analysis of Recent Performance and Trends of the CAC

Recent Performance

  • CAC level on November 11, 2025 : 8,159.6 points at close
  • Session change : +1.25%
  • One-year change : approximately +12%

Historically, the CAC has gone through several major economic cycles: surges during the 1990s, a crash following the dot-com bubble burst in 2000, the 2008 financial crisis, a gradual recovery in the 2010s, and then record highs surpassed beyond 8,000 points in the 2020s thanks to the growth of luxury, industry, and technology giants.

The volatility of the index varies according to periods and market shocks. Over the long term, the CAC offers an attractive return, especially when dividends are reinvested (GR or NR version of the index).

What Factors Influence the CAC?

  • Economic outlook for France and Europe: growth, unemployment, inflation, the monetary policy of the ECB, and corporate results are key factors.
  • Global events: geopolitical crisis, oil shock, pandemic, US and Chinese policies.
  • Selection and weight of companies within the index: entry or exit of major corporations, sectoral variations.
  • Currency effect: the CAC is not protected from fluctuations of the euro against the dollar or other major currencies.

Why invest in the CAC?

Including the CAC in your portfolio gives you direct exposure to the leading companies in the French and European economies while benefiting from significant sectoral diversification. The range of financial instruments linked to the CAC is extensive: ETFs, index funds, futures contracts, options, certificates, leveraged products...

  • Instant diversification: thanks to the wide range of sectors covered within the same index.
  • Accessibility: numerous investment solutions exist (see below).
  • Liquidity and transparency: the CAC is broken down into highly liquid underlying assets.
  • Potential for returns and solid historical performance: long-term growth, particularly attractive with the reinclusion of dividends.

How to invest in the CAC?

Investing via CAC 40 ETFs (trackers)

CAC 40 ETFs are listed on the stock exchange and designed to perfectly replicate the performance of the index. They can be purchased like stocks through any broker or online bank. The value of a share of a CAC 40 ETF fluctuates between a few dozen to one hundred euros, depending on the product chosen and its structure. For example, a typical CAC 40 ETF will have a share price ranging from €40 to €100, but never €47,743 — that would be a misunderstanding; only certain structured or institutional products could reach such amounts, not public ETFs.

ETFs are the simplest and most widespread method for gaining exposure to the evolution of the index. They come in several forms:

  • Traditional ETFs (replicating simply the raw or net performance of the CAC)
  • Dividend-reinvesting ETFs (Gross Return or Net Return)
  • Leveraged or inverse ETFs for active strategies (risky)

Investing in a CAC 40 ETF allows:

  • avoiding the purchase of the 40 individual stocks,
  • benefiting from automatic sectoral diversification,
  • accessing generally very low fees (often less than 0.3% per year).

Investment via mutual funds

Action-based mutual funds or index funds focused on the CAC 40 are managed by authorized management companies and accessible through life insurance contracts, PEA, or units of account. Each fund has its own share price, ISIN code, and performance sheet to analyze. Before subscribing, it is important to verify:

  • the nature of the fund (indexed, active),
  • annual and entry fees,
  • performance history,
  • the existence of an ISR label (Socially Responsible Investment) if desired.

Live Stock Exchange: Invest in Individual Shares

It is possible to invest in the CAC by purchasing individual shares that make up the index on Euronext Paris. However, this method requires a significant capital for a faithful diversification and exposes to higher brokerage fees.

Futures Contracts and Derivatives

Experienced investors may opt for derivatives: CAC 40 futures contracts (futures), options, turbos, warrants, etc. These instruments offer flexibility and leverage, but come with high risk.

Understanding Volatility and Beta of the CAC

The beta of the CAC 40 measures the sensitivity of the index relative to the European stock market. Historically, the CAC’s beta has hovered around 1 (which means that the index generally follows major market trends), but this figure varies according to market conditions and sectoral composition. For an up-to-date and precise figure, it is necessary to consult the detailed sheet of a given ETF or FCP, equipped with its ISIN code. There is no officially published daily beta for the index itself.

Sector Performance and Changes in Composition

The weighting of the CAC varies regularly according to sector performance. Between 2020 and 2025, the luxury sector's share has significantly increased due to the valuation increase of groups like LVMH and Hermès. The industry, energy, health, and finance sectors also maintain significant weights within the index. Good sectoral diversification partially protects the index against the fall of a single company or sector.

FAQ on Investing in the CAC

Who Selects the Companies in the CAC?

The composition is determined by the Scientific Council of Indices, which meets quarterly to study the capitalization, liquidity, and sectoral representativeness of companies listed on Euronext Paris.

What Is the Difference Between the Level of the CAC and the Price of an ETF or a Share?

The level of the CAC is always expressed in points—it is a mathematical index, not a financial asset that can be bought or sold at that level. The exchange-traded funds (ETFs) or investment funds (FCPs) that replicate this level have their own share price, typically ranging between €40 and €100 depending on the product chosen. It is never advisable to confuse the two: the CAC 40 does not possess a "price" in euros as indicated in some unverified content.

Can One Invest in the CAC Through a PEA?

Yes, many CAC 40 ETFs and eligible PEA stock funds exist, allowing for a tax-efficient exposure to the index through the equity savings plan.

What Are the Advantages and Limitations of the CAC for the Individual Investor?

  • Advantages: Exposure to the strongest companies in the market, liquidity, diversification, long-term performance history, ease of access through low-cost ETFs.
  • Drawbacks: Sensitivity to global economic crises, increasing sectoral concentration on certain segments (luxury, industry), lack of small-cap innovative companies.

What strategy should be adopted for investing in the CAC?

  • Passive management: Acquire ETFs or index funds replicating the CAC to follow the market's performance without trying to beat it.
  • Active management: Selectively choose some stocks from the CAC, or opt for active funds seeking to outperform the index.

How to track the performance of the CAC daily?

The value of the CAC and the performance of each of its components are available in real-time on major stock exchange websites, financial information sites, and mobile trading applications. Information on levels, changes, and composition is fully transparent and updated several times a day.

Summary and Key Points

  • The CAC is the flagship index of the French stock exchange, created in 1987, composed of 40 major companies from diversified sectors.
  • The index always expresses itself in points (never in euros), with levels exceeding 8,000 points reached in 2025.
  • Investing in the CAC allows you to benefit from the growth of the leading companies in the French economy, thanks to ETFs, FCPs, or direct purchase of shares.
  • The performance of the CAC comes from both the evolution of the share prices of the companies and, in its GR/NR version, from the reinvestment of dividends.
  • There are different ways to invest, adapted to each investor profile: ETFs, funds, active management, or derivatives.
  • Note the fundamental distinction between the level of the index and the price of the financial instruments that replicate it: an ETF CAC 40 will have a distinct share price, which is never equal to the point level of the index.

Conclusion: Incorporating the CAC into your investment strategy

Defining the CAC and understanding its operation represents a decisive advantage for any stock or financial investor. Whether you prefer the simplicity of passive management through low-cost ETFs, or wish to actively select star stocks from the Parisian market, the CAC remains an essential gateway to accompany the dynamics of large French companies. Its evolution reflects that of the national economic fabric and offers attractive prospects, within a logic of long-term diversification.