Berkshire Hathaway: a 3.9σ rise on 28 July 2026
Recorded 7 October 2026On 28 July 2026 Berkshire Hathaway rose 3.06% close to close, 3.9 times its typical daily move of 0.78% over the 20 sessions before it: larger than every one of the 16 sessions on record before it. 3 other instruments of the 199 measured that day moved 2σ or more.
The day
Daily closes, as recorded the night after
- Move
- +3.06%
- Size
- +3.9σ
- Typical day before it
- 0.78%
- Close
- 512.37
- Previous close, 27 July 2026
- 497.18
- Since, to 21 October 2026
- +5.20%
Berkshire Hathaway, the 30 sessions to 28 July 2026
Daily closes; the last point is the quake
Show values
| Point | BRK.B |
|---|---|
| 12 Jun 2026 | 489 |
| 15 Jun 2026 | 496 |
| 16 Jun 2026 | 495 |
| 17 Jun 2026 | 491 |
| 18 Jun 2026 | 489 |
| 22 Jun 2026 | 489 |
| 23 Jun 2026 | 493 |
| 24 Jun 2026 | 495 |
| 25 Jun 2026 | 488 |
| 26 Jun 2026 | 499 |
| 29 Jun 2026 | 496 |
| 30 Jun 2026 | 500 |
| 1 Jul 2026 | 500 |
| 2 Jul 2026 | 508 |
| 6 Jul 2026 | 507 |
| 7 Jul 2026 | 504 |
| 8 Jul 2026 | 495 |
| 9 Jul 2026 | 495 |
| 10 Jul 2026 | 494 |
| 13 Jul 2026 | 497 |
| 14 Jul 2026 | 491 |
| 15 Jul 2026 | 488 |
| 16 Jul 2026 | 493 |
| 17 Jul 2026 | 491 |
| 20 Jul 2026 | 491 |
| 21 Jul 2026 | 490 |
| 22 Jul 2026 | 489 |
| 23 Jul 2026 | 491 |
| 24 Jul 2026 | 495 |
| 27 Jul 2026 | 497 |
| 28 Jul 2026 | 512 |
The same day
Other quakes on 28 July 2026
No other instrument moved 3σ or more that day: this one moved on its own.
Berkshire Hathaway's other quakes
On record, newest first
- 17 September 2026: −2.04%, −3.6σ
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.