Michael J. O'Sullivan, Insider at Berkshire Hathaway, bought BRK.B on Aug 12, 2026
Data as of Oct 16
- Traded
- Aug 12, 2026
- Disclosed
- Aug 13, 2026
- Filed
- 1 day after the trade
Form 4s are due within two business days.
Official filing (SEC Form 4) ↗
The price around the disclosure
BRK.B since disclosure
+4.9%
Similar stocks (XLF) since disclosure
−4.7%
XLF — its sector index fund
Change in closing price from Aug 13, 2026 (the first trading day on or after disclosure) to Oct 16, 2026. Dividends excluded. Not a return anyone earned.
Our take
None of our tested rules fired on this trade.
Other trades in the same filing
- ▲ BUYMichael J. O'Sullivan InsiderBRK.B Berkshire Hathaway Inc$23Kdisclosed Aug 13 · filed 1 day after the trade
- ▲ BUYMichael J. O'Sullivan InsiderBRK.B Berkshire Hathaway Inc$205Kdisclosed Aug 13 · filed 1 day after the trade