CAC 40: a 3.5σ fall on 9 September 2026
Recorded 7 October 2026On 9 September 2026 CAC 40 fell 1.94% close to close, 3.5 times its typical daily move of 0.55% over the 20 sessions before it: larger than every one of the 49 sessions on record before it. 9 other instruments of the 199 measured that day moved 2σ or more.
The day
Daily closes, as recorded the night after
- Move
- −1.94%
- Size
- −3.5σ
- Typical day before it
- 0.55%
- Close
- 8,156.67
- Previous close, 8 September 2026
- 8,317.98
- Since, to 21 October 2026
- −2.88%
CAC 40, the 30 sessions to 9 September 2026
Daily closes; the last point is the quake
Show values
| Point | CAC |
|---|---|
| 29 Jul 2026 | 8,408 |
| 30 Jul 2026 | 8,486 |
| 31 Jul 2026 | 8,510 |
| 3 Aug 2026 | 8,614 |
| 4 Aug 2026 | 8,667 |
| 5 Aug 2026 | 8,669 |
| 6 Aug 2026 | 8,700 |
| 7 Aug 2026 | 8,715 |
| 10 Aug 2026 | 8,726 |
| 11 Aug 2026 | 8,715 |
| 12 Aug 2026 | 8,675 |
| 13 Aug 2026 | 8,651 |
| 14 Aug 2026 | 8,637 |
| 17 Aug 2026 | 8,580 |
| 18 Aug 2026 | 8,509 |
| 19 Aug 2026 | 8,502 |
| 20 Aug 2026 | 8,453 |
| 21 Aug 2026 | 8,484 |
| 24 Aug 2026 | 8,453 |
| 25 Aug 2026 | 8,439 |
| 26 Aug 2026 | 8,462 |
| 27 Aug 2026 | 8,320 |
| 28 Aug 2026 | 8,401 |
| 31 Aug 2026 | 8,335 |
| 1 Sep 2026 | 8,302 |
| 2 Sep 2026 | 8,281 |
| 3 Sep 2026 | 8,286 |
| 4 Sep 2026 | 8,279 |
| 7 Sep 2026 | 8,306 |
| 8 Sep 2026 | 8,318 |
| 9 Sep 2026 | 8,157 |
The same day
Other quakes on 9 September 2026
| Instrument | Move | Size |
|---|---|---|
| FTSE 100 FTSE | −1.31% | −3.6σ |
| Meta Platforms META | +6.55% | +3.2σ |
| Euro Stoxx 50 STOXX50 | −1.58% | −3.1σ |
| DAX 40 DAX | −1.66% | −3.0σ |
| Swiss Market Index SMI | −1.80% | −3.0σ |
CAC 40's other quakes
On record, newest first
- 27 August 2026: −1.68%, −3.2σ
- 8 July 2026: −2.18%, −3.3σ
How it is measured
The move is the close-to-close return; its size is that return divided by the standard deviation of CAC 40's previous 20 daily returns. A quake is 3σ or more. This record was made the night after the day finished trading and has not been changed since. The live chart is on CAC 40's page; the last few months of every market's daily moves are on the volatility terrain, and every quake on record is in the quake archive.