CAC 40 Index¶
OVERVIEW¶
The CAC 40 (Cotation Assistée en Continu) is the primary benchmark stock market index for France, representing the 40 most significant and liquid equities listed on the Euronext Paris exchange. Managed by Euronext Paris, the index serves as a barometer for the broader French economy and European large-cap equities.
Note
The CAC 40 is a free-float, market-capitalization-weighted index. The largest companies by public float exert the most influence over its movements.
FEATURES¶
| Feature | Detail |
|---|---|
| Exchange | Euronext Paris |
| Constituents | 40 large-cap equities |
| Weighting method | Free-float market capitalization |
| Currency | Euro (EUR) |
| Calculation | Real-time, continuous |
| Review frequency | Quarterly |
| Governing body | Index Steering Committee |
| Total return variant | CAC 40 GR (Gross Return) |
| Primary futures venue | Euronext |
| Common tracking ETF | EWQ |
HOW TO USE¶
Calculation Methodology¶
The CAC 40 index level is determined by the following formula:
The divisor is a proprietary adjustment factor maintained by Euronext. It ensures index continuity is unaffected by corporate actions such as stock splits, special dividends, or constituent changes. Only shares available for public trading are included — strategic holdings by governments or founding families are excluded from the free-float weight calculation.
Worked Example¶
Assume the CAC 40 has a current base divisor of 100,000,000. If the total free-float market capitalization of all 40 constituent stocks is €1,500,000,000,000:
Tip
Index heavyweights MC (LVMH), OR (L'Oréal), and TTE (TotalEnergies) dominate index weight. A 5% decline in LVMH alone can drag the entire CAC 40 lower, potentially offsetting gains across the remaining 39 constituents.
Trading Applications¶
| Use Case | Description |
|---|---|
| Market sentiment | Gauge broader European equity conditions |
| Eurozone hedging | Hedge large-cap Eurozone equity exposure |
| Macro pair trades | Execute directional trades on European vs. global indices |
| Overnight hedging | Use CAC 40 futures for directional hedging outside market hours |
| Trend confirmation | Combine with DAX and Euro Stoxx 50 to confirm pan-European momentum |
| Sector exposure | Proxy for global luxury, energy, and aerospace trends |
Note
Many CAC 40 constituents are global multinationals deriving significant revenue outside France. The index should not be treated as a pure domestic French economic indicator.
Limitations and Misconceptions¶
| Limitation | Detail |
|---|---|
| Concentration risk | LVMH, L'Oréal, and Sanofi account for a disproportionate share of total index weight |
| Misleading strength signal | A rising CAC 40 may reflect global luxury demand or a weak Euro, not domestic economic health |
| Dividend exclusion | The standard CAC 40 price index excludes dividends — use CAC 40 GR for total return comparisons |
| Mid-cap blind spot | Broad domestic weakness in mid-cap sectors can be masked by mega-cap outperformance |
Tip
When comparing long-term historical performance, always reference the CAC 40 GR (Total Return) variant to account for dividend reinvestment. Comparing price index charts against total return benchmarks will produce significant discrepancies over multi-year periods.
KEYBOARD SHORTCUTS¶
| Shortcut | Action |
|---|---|
F |
Add CAC 40 to watchlist |
Q |
Open CAC 40 quote panel |
C |
Open CAC 40 chart |
D |
View constituent breakdown |
H |
Toggle historical index data |
T |
Switch between price index and total return (GR) view |
Esc |
Close active panel |