O'Sullivan Michael J.: insider buys
Every open-market stock purchase reported by O'Sullivan Michael J. to the SEC on Form 4.
Total bought$500.62K
Purchases2
Companies1
Last purchase filedAug 13, 2026
Return on these buys+11%
O'Sullivan Michael J. has made 2 open-market purchases worth $500.62K in 1 company since May 6, 2026, according to SEC Form 4 filings. The most recent was filed on Aug 13, 2026: 488 shares of BRK.B at $512.44 (See Remarks), worth $250.07K. The largest was $250.55K of BRK.B on May 6, 2026. Taken together, these purchases are up 11% at the latest closing prices (split-adjusted, weighted by amount).
Companies O'Sullivan Michael J. bought
| Ticker | Company | Role | Buys | Total | Since buy | Last filed |
|---|---|---|---|---|---|---|
| BRK.B | Berkshire Hathaway Inc | See Remarks | 2 | $500.62K | +11% | Aug 13 |
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| Filed | Stock | Insider | Value | Shares | Price | Since buy | Stake | Trade | |
|---|---|---|---|---|---|---|---|---|---|
| Aug 13 | BRK.BBerkshire Hathaway Inc | O'Sullivan Michael J.See Remarks | $250.07K | 488 | $512.44 | +5.9% | +79% | Aug 12 | SEC |
| May 6 | BRK.BBerkshire Hathaway Inc | O'Sullivan Michael J.See Remarks | $250.55K | 536 | $467.44 | +16% | +422% | May 6 | SEC |