Berkshire Hathaway (BRK-B) Seasonality
Recurring seasonal patterns for BRK-B — the calendar windows where Berkshire Hathaway has historically tended to rise or fall, with the win rate (how often it repeated) and average return for each, based on the last 10 years of price history.
BRK-B seasonality at a glance
Over the last 10 years, BRK-B's strongest seasonal window has been Oct 31 – Nov 30: it ended higher in 9 of 10 years (90% win rate) with an average return of +6.02% across a 30-day hold. On the weak side, BRK-B has historically declined between Jun 7 – Jun 27, falling in 8 of 10 years (average -3.47%).
In total, our analysis finds 590 recurring seasonal windows for Berkshire Hathaway — 463 bullish and 127 bearish. The next high-win-rate window, Jul 28 – Aug 17, opens tomorrow. These figures describe historical behaviour only — not a forecast.
BRK-B's upcoming & recent seasonal patterns
Holding period:10-day20-day30-dayOrdered by season — windows opening soon first, plus a couple of recently completed high-performers. Holding-period colors help you compare durations at a glance.
| Status | Seasonal window | Hold | Avg return | Win rate | This year |
|---|---|---|---|---|---|
| Completedended 5d ago | Jun 22 – Jul 22 | 30d | +2.63% | 80% | +0.14% |
| Completedended 6d ago | Jun 21 – Jul 21 | 30d | +2.52% | 80% | +0.04% |
| Active20d left | Jul 27 – Aug 16 | 20d | +2.53% | 80% | — |
| Active30d left | Jul 27 – Aug 26 | 30d | +2.74% | 80% | — |
| Upcomingtomorrow | Jul 28 – Aug 17 | 20d | +2.09% | 80% | — |
| Upcomingtomorrow | Jul 28 – Aug 27 | 30d | +2.98% | 80% | — |
| Upcomingin 2d | Jul 29 – Aug 18 | 20d | +1.83% | 90% | — |
Win rate = how often the pattern repeated in the same direction. Average return = the mean move across all analysed years. Past performance does not guarantee future results.
Explore BRK-B seasonality in full
See the seasonal curve chart, filter by win rate and return, and track upcoming windows — free during beta.
BRK-B seasonality FAQ
What has historically been the best month to buy BRK-B stock?
Based on the last 10 years of price data, BRK-B's strongest seasonal window starts in October: Oct 31 to Nov 30, which ended higher in 9 of 10 years (90% win rate) with an average return of +6.02%. Past seasonal patterns do not guarantee future performance.
What is BRK-B's strongest seasonal pattern?
BRK-B's highest-win-rate pattern in our data is the Oct 31 – Nov 30 window (30-day hold): up in 9 of the last 10 years with an average move of +6.02%.
When has BRK-B historically performed worst?
BRK-B's weakest recurring window has been Jun 7 to Jun 27, declining in 8 of 10 years with an average return of -3.47%.
How reliable are BRK-B's seasonal patterns?
Each BRK-B pattern is scored by its historical win rate — the share of the last 10 years it repeated in the same direction. BRK-B currently shows 590 recurring windows (463 bullish, 127 bearish). Seasonality describes historical tendencies only; it is not a prediction, and past performance does not guarantee future results.
What is BRK-B stock seasonality?
Stock seasonality is the tendency of a stock to perform in a similar way during the same period each year. By analysing Berkshire Hathaway's price history across many years, SeasonalityX identifies recurring calendar windows — exact start and end dates — where BRK-B has repeatedly risen (bullish) or fallen (bearish). Each pattern is scored by its win rate and average return so you can judge how reliable and how strong it has been.
Seasonality is one input among many — it works best alongside your own research and risk management. Learn more in our guide to seasonal analysis and the tutorials.