Boeing: a 7.6σ fall on 27 October 2026
Recorded 29 October 2026On 27 October 2026 Boeing fell 10.69% close to close, 7.6 times its typical daily move of 1.41% over the 20 sessions before it: larger than every one of the 65 sessions on record before it. 7 other instruments of the 199 measured that day moved 2σ or more.
The day
Daily closes, as recorded the night after
- Move
- −10.69%
- Size
- −7.6σ
- Typical day before it
- 1.41%
- Close
- 168.18
- Previous close, 26 October 2026
- 188.31
- Since, to 6 November 2026
- +3.10%
Boeing, the 30 sessions to 27 October 2026
Daily closes; the last point is the quake
Show values
| Point | BA |
|---|---|
| 15 Sep 2026 | 210 |
| 16 Sep 2026 | 202 |
| 17 Sep 2026 | 197 |
| 18 Sep 2026 | 198 |
| 21 Sep 2026 | 201 |
| 22 Sep 2026 | 198 |
| 23 Sep 2026 | 200 |
| 24 Sep 2026 | 197 |
| 25 Sep 2026 | 198 |
| 28 Sep 2026 | 184 |
| 29 Sep 2026 | 188 |
| 30 Sep 2026 | 186 |
| 1 Oct 2026 | 192 |
| 2 Oct 2026 | 194 |
| 5 Oct 2026 | 193 |
| 6 Oct 2026 | 190 |
| 7 Oct 2026 | 188 |
| 8 Oct 2026 | 188 |
| 9 Oct 2026 | 190 |
| 12 Oct 2026 | 190 |
| 13 Oct 2026 | 186 |
| 14 Oct 2026 | 185 |
| 15 Oct 2026 | 189 |
| 16 Oct 2026 | 190 |
| 19 Oct 2026 | 191 |
| 20 Oct 2026 | 190 |
| 21 Oct 2026 | 192 |
| 22 Oct 2026 | 188 |
| 23 Oct 2026 | 188 |
| 26 Oct 2026 | 188 |
| 27 Oct 2026 | 168 |
The same day
Other quakes on 27 October 2026
| Instrument | Move | Size |
|---|---|---|
| US Dollar / Chilean Peso USD/CLP | +3.11% | +4.1σ |
| US Dollar / Philippine Peso USD/PHP | +0.58% | +3.2σ |
Boeing's other quakes
On record, newest first
- 28 September 2026: −6.91%, −4.4σ
- 3 August 2026: +8.03%, +3.5σ
- 28 July 2026: +4.76%, +3.2σ
How it is measured
The move is the close-to-close return; its size is that return divided by the standard deviation of Boeing'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 Boeing'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.