BRK-B 20-day return: the current reading and its track record
BRK-B’s current 20-day return reading and what that signal has historically been followed by.
This page covers Berkshire Hathaway (BRK-B) — its current 20-day return reading and the measured historical record of what BRK-B 20-day return extremes were followed by.
How to read this. These figures are measured only on instruments currently covered by this site — a set of companies that survived. Signals that appear to have ‘worked’ on the downside are conditioned on these names having recovered; a company that fell and never came back would not be here to measure. Read every number below as a property of this surviving sample, not a universal rule, and never as advice.
All figures are ‘excess’ returns — measured relative to each instrument’s own historical drift, not relative to the market. This is not alpha and not a market-beating claim; it isolates the signal from the instrument’s background trend. Measured from the first day each signal appeared (not its most extreme point), so it reflects what was knowable in real time.
Measured across BRK-B’s 20-day return history from 1996 to 2024: 35 high-extreme episodes and 32 low-extreme episodes. High-extreme readings were followed by -0.48% excess at 5 sessions and -1.00% by 20; low-extreme readings were followed by +0.98% excess at 5 sessions and -0.49% by 20.
On this signal, the most recent episode in which BRK-B was at a high extreme began on 2024-08-30; the most recent in which it was at a low extreme, on 2022-09-14.
Outcomes are measured for episodes up to 2024-08-30, the most recent with enough later sessions to score. The current reading above is from a later date, 2026-10-16.
When BRK-B was at a high extreme
Across 35 past episodes where BRK-B was at a high extreme on this signal, the close 20 sessions later lagged BRK-B’s own trailing drift by 1.00 percentage points on average (40% of episodes beat drift).
| horizon | excess vs own drift | beat-drift rate | episodes with a complete horizon |
|---|---|---|---|
| 1 session | +0.18% | 46% | 35 |
| 5 sessions | -0.48% | 49% | 35 |
| 20 sessions | -1.00% | 40% | 35 |
When BRK-B was at a low extreme
Across 32 past episodes where BRK-B was at a low extreme on this signal, the close 20 sessions later lagged BRK-B’s own trailing drift by 0.49 percentage points on average (50% of episodes beat drift).
| horizon | excess vs own drift | beat-drift rate | episodes with a complete horizon |
|---|---|---|---|
| 1 session | +0.46% | 38% | 32 |
| 5 sessions | +0.98% | 50% | 32 |
| 20 sessions | -0.49% | 50% | 32 |
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