Michael J. O'Sullivan bought $250k of BRK-B
See Remarks at BERKSHIRE HATHAWAY INC. 488 shares at an average of $512.44, traded Aug 12, 2026, filed Aug 13, 2026.
Score components
- +15RoleOfficer
- +13Trade size$250k at market
- +10Relative to holdingsHoldings up 74%
- +10Price context10% above the 52-week low
- 0ClusterNo other insider buying within 14 days
- 0Repeat buyingFirst buy in 90 days
- 0Track recordToo few past buys to judge (0 with prices)
What happened after comparable buys
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0001193125-26-349574, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Aug 12, 2026 | POpen-market purchase Class B Common Stockindirect: By Trust | +45 | $510.64 | $23k | 708 | Aug 13, 2026 |
| Aug 12, 2026 | POpen-market purchase Class B Common Stockindirect: By Trust | +400 | $512.52 | $205k | 1,108 | Aug 13, 2026 |
| Aug 12, 2026 | POpen-market purchase Class B Common Stockindirect: By Trust | +43 | $513.61 | $22k | 1,151 | Aug 13, 2026 |
Related signals
Other insiders at BERKSHIRE HATHAWAY INC and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 55Moderate | BRK-Bsell BERKSHIRE HATHAWAY INC | Ajit Jain Vice Chairman | $20M 39,700 shares | -37% | |
| 48Moderate | BRK-Bbuy BERKSHIRE HATHAWAY INC | Michael J. O'Sullivan See Remarks | $251k 536 shares | +422% | |
| 44Moderate | BRK-Bsell BERKSHIRE HATHAWAY INC | Ajit Jain Vice Chairman | $929k 2,000 shares | -2% | |
| 70Notable | BRK-Bsell BERKSHIRE HATHAWAY INC | Meryl B Witmer director | $1.6M 2 shares | -50% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.