Berkshire Hathaway: a 3.6σ fall on 17 September 2026
Recorded 7 October 2026On 17 September 2026 Berkshire Hathaway fell 2.04% close to close, 3.6 times its typical daily move of 0.57% over the 20 sessions before it: its largest move since 28 July 2026. 14 other instruments of the 199 measured that day moved 2σ or more.
The day
Daily closes, as recorded the night after
- Move
- −2.04%
- Size
- −3.6σ
- Typical day before it
- 0.57%
- Close
- 509.2
- Previous close, 16 September 2026
- 519.8
- Since, to 21 October 2026
- +5.85%
Berkshire Hathaway, the 30 sessions to 17 September 2026
Daily closes; the last point is the quake
Show values
| Point | BRK.B |
|---|---|
| 5 Aug 2026 | 519 |
| 6 Aug 2026 | 525 |
| 7 Aug 2026 | 522 |
| 10 Aug 2026 | 529 |
| 11 Aug 2026 | 516 |
| 12 Aug 2026 | 510 |
| 13 Aug 2026 | 507 |
| 14 Aug 2026 | 504 |
| 17 Aug 2026 | 498 |
| 18 Aug 2026 | 503 |
| 19 Aug 2026 | 500 |
| 20 Aug 2026 | 497 |
| 21 Aug 2026 | 496 |
| 24 Aug 2026 | 504 |
| 25 Aug 2026 | 504 |
| 26 Aug 2026 | 505 |
| 27 Aug 2026 | 504 |
| 28 Aug 2026 | 505 |
| 31 Aug 2026 | 504 |
| 1 Sep 2026 | 502 |
| 2 Sep 2026 | 505 |
| 3 Sep 2026 | 508 |
| 4 Sep 2026 | 506 |
| 8 Sep 2026 | 506 |
| 9 Sep 2026 | 507 |
| 10 Sep 2026 | 507 |
| 11 Sep 2026 | 510 |
| 14 Sep 2026 | 515 |
| 15 Sep 2026 | 517 |
| 16 Sep 2026 | 520 |
| 17 Sep 2026 | 509 |
The same day
Other quakes on 17 September 2026
| Instrument | Move | Size |
|---|---|---|
| NEAR Protocol NEAR | +20.63% | +3.7σ |
Berkshire Hathaway's other quakes
On record, newest first
- 28 July 2026: +3.06%, +3.9σ
How it is measured
The move is the close-to-close return; its size is that return divided by the standard deviation of Berkshire Hathaway'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 Berkshire Hathaway'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.