Qualcomm: a 3.1σ fall on 18 September 2026
Recorded 7 October 2026On 18 September 2026 Qualcomm fell 5.82% close to close, 3.1 times its typical daily move of 1.88% over the 20 sessions before it: its largest move since 4 August 2026. 30 other instruments of the 147 measured that day moved 2σ or more.
The day
Daily closes, as recorded the night after
- Move
- −5.82%
- Size
- −3.1σ
- Typical day before it
- 1.88%
- Close
- 177.72
- Previous close, 17 September 2026
- 188.71
- Since, to 21 October 2026
- +0.14%
Qualcomm, the 30 sessions to 18 September 2026
Daily closes; the last point is the quake
Show values
| Point | QCOM |
|---|---|
| 6 Aug 2026 | 160 |
| 7 Aug 2026 | 168 |
| 10 Aug 2026 | 162 |
| 11 Aug 2026 | 163 |
| 12 Aug 2026 | 163 |
| 13 Aug 2026 | 165 |
| 14 Aug 2026 | 166 |
| 17 Aug 2026 | 162 |
| 18 Aug 2026 | 160 |
| 19 Aug 2026 | 162 |
| 20 Aug 2026 | 161 |
| 21 Aug 2026 | 161 |
| 24 Aug 2026 | 159 |
| 25 Aug 2026 | 161 |
| 26 Aug 2026 | 164 |
| 27 Aug 2026 | 165 |
| 28 Aug 2026 | 164 |
| 31 Aug 2026 | 170 |
| 1 Sep 2026 | 167 |
| 2 Sep 2026 | 170 |
| 3 Sep 2026 | 169 |
| 4 Sep 2026 | 169 |
| 8 Sep 2026 | 174 |
| 9 Sep 2026 | 176 |
| 10 Sep 2026 | 177 |
| 11 Sep 2026 | 182 |
| 14 Sep 2026 | 180 |
| 15 Sep 2026 | 188 |
| 16 Sep 2026 | 185 |
| 17 Sep 2026 | 189 |
| 18 Sep 2026 | 178 |
The same day
Other quakes on 18 September 2026
Qualcomm's other quakes
On record, newest first
- 21 September 2026: +9.29%, +3.9σ
- 4 August 2026: +7.32%, +3.1σ
How it is measured
The move is the close-to-close return; its size is that return divided by the standard deviation of Qualcomm'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 Qualcomm'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.