What Is the CAC 40 Index: Meaning and History

CAC 40 is one of the stock market indices you'll always see included in business news round-ups. It represents the overall performance and the economic health of Europe and France in particular.

When it officially launched in 1988, it coincidentally was registered at an all-time low. An all-time high was recorded in September 2000. But what about the CAC 40 index now, and is it worth investing in? Let's explore what purposes this index serves, how it's calculated, and what trading strategies can yield good profits.

What Is the CAC 40 Index?

A stock market index is a statistical composite that measures the collective performance of a selected group of shares, weighting each company — typically by market capitalisation — to produce a single benchmark figure. The CAC 40 is France's primary example of such a benchmark.

The CAC 40 is a free-float capitalisation-weighted index. It quotes 40 of the largest and most actively traded shares in France and is considered a measure of the economy and the Paris stock market. It's similar to what Dow Jones represents for the United States, FTSE 100 is for the UK, Nikkei 225 is for Japan, etc.

Originally, the acronym CAC meant Compagnie des Agents de Change. It was a group of brokers that operated the Paris Stock Exchange since at least the 16th century. The initial sentiment was transformed, but the acronym stayed.

Cotation Assistée en Continu was introduced in 1988 as a technological modernisation of the Paris Bourse, moving from the manual agent-based trading of the Compagnie des Agents de Change system to computerised quotation. The index was benchmarked from 31 December 1987 with a base value of 1,000 points, establishing the starting reference against which all subsequent performance is measured.

Companies within the CAC 40 composition account for about 20% of market capitalisation in Europe, which shows how influential it is. It's also tightly connected to the Euro Stoxx 50 index, where they have 15 companies in common. CAC often catches the attention of international investors, with almost half of CAC 40 shares held by non-residents and a quarter owned by investors outside of the Eurozone.

Euronext is a pan-European exchange group operating regulated markets in France, the Netherlands, Belgium, Ireland, Norway, Portugal, and Italy (following its 2014 spin-off from NYSE Euronext). Euronext Paris is the French subsidiary and the mandatory listing venue that determines CAC 40 eligibility. Only companies using Euronext Paris as their market of reference can be assessed for inclusion in the index.

CAC 40 in the Global Index Landscape

Every major economy maintains a flagship equity benchmark that investors use to gauge overall market health. The CAC 40 serves this role for France in the same way that comparable indices serve other nations.

The CAC 40 shares its exchange infrastructure with several other national benchmarks under the Euronext group umbrella. The AEX covers the 25 largest companies on Euronext Amsterdam and serves as the Dutch national benchmark, while the ISEQ 20 tracks the 20 largest companies listed on Euronext Dublin. Together, these indices represent different national markets operating within the same pan-European exchange group, with the CAC 40 being the largest and most internationally referenced of the three.

The relationship between the CAC 40 and the EURO STOXX 50 is particularly close: as of September 2025, 15 French companies are shared between the two indices, meaning that French blue-chips carry significant influence over the broader pan-European benchmark. Investors tracking the EURO STOXX 50 are, in effect, substantially exposed to the same companies that drive CAC 40 performance. France represents 34.2% of total EURO STOXX 50 assets as of September 2025.

By contrast, the Nasdaq's technology-heavy weighting — with thousands of constituents dominated by US software, semiconductor, and internet companies — offers a very different sectoral profile from the CAC 40's diversification across luxury goods, energy, aerospace, and pharmaceuticals, making the CAC 40 an appealing option for investors seeking European exposure away from concentrated US tech risk.

What Are CAC 40 Companies?

The CAC 40 represents various industries within the French economy. Some sectors include personal products, pharmaceuticals, banking, industrial materials, telecommunications, publishing, media and entertainment, chemicals, etc.

The composition of the index is reviewed multiple times a year by the Conseil Scientifique. They study market capitalisation and turnover of constituent companies. They make their selection after the close of the third Friday of March, June, September and December.

Source: Euronext

It's not uncommon for companies to be taken off the list. Here are some criteria companies need to meet to be admitted to the CAC 40 listing:

• Euronext Paris as a market of reference
• Significant activities and presence in the French economy
• Members of staff and/or headquarters located in France
• Sizable trading volumes.

Here are the index's most prominent constituents. Total Energies (largest weighting at 9.52%) is an integrated energy group spanning oil, gas, and renewables. Schneider Electric (7.57%, now the second-largest constituent) is a global leader in energy management and industrial automation. LVMH is the world's largest luxury goods conglomerate by revenue, owning brands including Louis Vuitton, Moët & Chandon, and Dior. Airbus, headquartered in Toulouse with pan-European manufacturing operations, anchors the Industrials sector. Sanofi is one of Europe's largest pharmaceutical companies. Michelin, the global tyre and mobility technology manufacturer, demonstrates that the index extends into heavy industry. BNP Paribas represents the financial sector.

Before any company can be assessed for inclusion, it must have completed an IPO and established a trading history on Euronext Paris. For companies already in the index, maintaining sufficient market capitalisation and trading volume is an ongoing requirement. If a constituent falls below the thresholds assessed at the quarterly review, it may be replaced by the next-largest eligible company. Think of it as a league table: strong performers stay in; those that fall in size or liquidity make way for rising challengers.

How Is the CAC 40 Calculated?

As with most modern capitalisation-weighted indices, the CAC 40 uses the free-float variant of market capitalisation rather than the total outstanding share count. Market capitalisation is calculated by multiplying a company's share price by its total number of outstanding shares. For example, a company with 500 million shares priced at €100 each has a market capitalisation of €50 billion.

Free-float capitalisation weighting refines this further by counting only publicly tradable shares, i.e., those not held by governments, founding families, or strategic long-term investors who are unlikely to sell. If Company A's free-float market cap is €50 billion and the combined free-float market cap of all 40 constituents is €1,000 billion, Company A carries a 5% weight in the index. This weighting approach ensures the index reflects the market as it is actually traded, not just on paper.

The Conseil Scientifique oversees the CAC 40's composition through a quarterly review process, meeting after the close of the third Friday of March, June, September, and December. At each review, constituents are assessed on three criteria: market capitalisation, average daily trading turnover, and free-float percentage. Companies that no longer meet the required thresholds may be replaced by the next-largest eligible company. To prevent over-concentration, a 5% 15% cap is applied to any individual constituent's weighting. No single company can exceed this share of the total index weight. This cap is reviewed annually by the Index Steering Committee in September.

Factors Influencing the CAC on the Stock Exchange

The key factor you need to understand about CAC 40 is that it relies on French economic activity. In addition to that, multiple accompanying influences affect its price and general market sentiment. To make the right decisions, you should stay informed on:

• National events (GDP, the employment and unemployment rates, trade balance)
• Global events (international politics, related indices, Eurozone governance)
• Performances of quoted companies (capitalisation, turnover, etc.)
• Major changes in companies' structures and policies

Advantages and Disadvantages of the CAC Index

These days, you can find hundreds of assets that you can trade with. Below are some arguments favouring the CAC 40 Index:

• Indices are more liquid than equities.
• CAC 40 traders are exposed to lower risks because it's made up of several stocks.
• France remains one of the leading economies in Europe, so it makes sense to invest in French indices.
• It's easier to keep track of one index rather than many individual companies.

There's no such thing as a perfect trading asset. So, for transparency reasons, let's take a look at the downsides of CAC 40:

• You have no control over individual index components.
• This index doesn't provide exposure to smaller-cap companies.
• The index price calculation isn't always fair.

Dividends and Total Return

Many CAC 40 constituents pay regular dividends to their shareholders, adding an income dimension to index exposure that sits alongside potential capital growth. A concrete advantage for investors who value yield alongside price appreciation.

The standard CAC 40 headline figure that appears in news feeds and trading platforms is a price return index: it tracks share price movements but excludes any dividends paid by constituent companies. Reinvested dividends are captured separately by the CAC 40 Total Return variant (CAC 40 TR), which reflects the full compound return available to a long-term investor who reinvests every dividend received.

For CFD traders, this distinction matters when benchmarking performance: if you are comparing a CFD position's gains against a published CAC 40 chart, check whether that chart references the price index or the total return index, as the two figures can diverge meaningfully over time.

CAC 40 CFD Trading

As a trader, you can't buy indices, including CAC 40, because they're just benchmarks. However, it doesn't mean it's unfit for trading at all. This is where you should go for CFDs. There are many perks to using this particular instrument, and you will see why.

What Is CFD Trading?

CFD stands for contract for difference and acts as a form of derivative trading. In recent years, CFDs have become a popular method for online investing. It can be applied to indices, commodities, currencies and stocks.

When you work with CFDs, you aren't actually purchasing an underlying asset directly. Instead, you engage in a contract with a CFD broker and buy/sell a number of units for a particular financial instrument. No matter which way the market goes, CFDs are suitable when you expect prices to go up or down.

Advantages and Disadvantages of CFD CAC 40

If you're interested in working with CAC 40, it makes sense to enter the market using CFDs. With CFDs, you can:

• Use CFDs as a quicker and more accessible medium for trading.
• Gain exposure with less capital by using leverage.
• Take advantage of all market movements.

Stamp duty is a government transaction tax levied on the purchase of physical shares in certain jurisdictions. Because CFDs do not transfer ownership of the underlying shares, this tax does not apply to CFD trades — representing a direct cost saving compared to buying shares directly in markets where such a tax applies.

It is important to understand that this saving exists alongside other trading costs, not instead of them. CAC 40 CFD traders pay a spread (the difference between the buy and sell price at execution), holding costs (overnight financing charges applied to positions kept open beyond the trading day), and commissions on each trade. The high liquidity of CAC 40 CFDs typically results in tighter spreads compared to less liquid instruments, reducing the effective cost per trade.

At the same time, you shouldn't overlook the additional risks when trading with leverage.

How Leverage Works on CAC 40 CFDs

Because CFDs are margin products rather than outright purchases, leverage is an inherent feature of how they function. Leverage allows a trader to control a larger CAC 40 CFD position using only a fraction of its total value as the initial margin deposit.

Under ESMA regulations, the leverage cap for major index CFDs (including the CAC 40) is 1:20 for retail clients, distinct from the 1:30 cap that applies to major currency pairs. With 1:20 leverage, a €1,000 margin deposit controls a €20,000 CAC 40 CFD position. A 5% rise generates a €1,000 gain, a 100% return on margin. The same 5% fall produces a €1,000 loss, wiping out the entire margin deposit. Leverage amplifies both gains and losses equally. If a losing position is not closed or protected by a stop-loss order, losses can exceed the initial deposit.

The correct ESMA cap for major index CFDs is 1:20 for retail clients (1:30 applies to major FX pairs only). Keep in mind that 84% of retail investor accounts lose money when trading CFDs with this provider.

Alternative Ways to Gain CAC 40 Exposure

CFDs are not the only instrument for gaining exposure to CAC 40 performance. Two significant alternatives are worth understanding.

Exchange-traded funds (ETFs) tracking the CAC 40 provide passive exposure by holding the index's constituent shares in proportion to their weighting. Buying a CAC 40 ETF means purchasing actual fund units. You own a stake in the underlying companies, benefit from dividends, and track the index's total return over time without leverage. ETFs suit long-term, buy-and-hold investors who want straightforward CAC 40 participation. They are not available on CFD platforms like Libertex; investing in an ETF requires a different type of brokerage account.

CAC 40 options give the buyer the right — but not the obligation — to buy or sell the index at a predetermined price before a specified expiry date. Unlike a CFD, an option buyer's maximum loss is limited to the premium paid upfront. The mechanics are considerably more complex than CFD trading, making options better suited to experienced traders with specific directional views or hedging strategies.

For active traders seeking leveraged, two-directional CAC 40 exposure without the complexity of options or the capital requirements of ETF investing, CFDs remain the most accessible and flexible instrument.

CAC 40 CFD Trading Strategies

When you trade the CAC 40 with CFDs, you can use leverage to increase gains in a relatively small amount of time; at the same time, leverage also increases potential losses, up to your entire capital. You can only do so if you pick the right strategy. You can employ regular strategies, but remember to consider specific characteristics of CFDs. Here's how you behave during:

• Bullish market. Even during rising markets, prices inevitably go through occasional consolidation or retracement periods. Try swing trading to benefit from these small reversals and get maximum returns.
• Bearish market. Since CFDs allow you to trade in all directions, you can go short when prices are falling. So, even in tumultuous periods, you have the option of buying in through CFDs.

Takeaways on the CAC French Stock Index

The CAC 40 is a great asset to diversify your portfolio. It offers exposure to a variety of the most prominent French companies and provides decent potential profits (when done right). It suits all kinds of traders; you can trade as much or as little as you want.

Before you're ready to enter the real market, you need to learn the basics. At Libertex, we offer a wide range of resources to build your trading skills. Sign up for a free demo account to ensure you'll be managing your future CFD portfolio properly.