O'Sullivan Michael J. (CIK 1713777) reported 32 SEC Form 4 insider transactions across 2 companies over the past 18 months (most recent 2026-08-13). Recent activity: Buy BRK.B (400 shares), Buy BRK.B (45 shares), Buy BRK.B (43 shares), Buy BRK.B (483 shares), Buy BRK.B (53 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-13 | BERKSHIRE HATHAWAY INC (BRK.B) | See Remarks | Buy | 400 | $205,008 |
| 2026-08-13 | BERKSHIRE HATHAWAY INC (BRK.B) | See Remarks | Buy | 45 | $22,979 |
| 2026-08-13 | BERKSHIRE HATHAWAY INC (BRK.B) | See Remarks | Buy | 43 | $22,085 |
| 2026-05-06 | BERKSHIRE HATHAWAY INC (BRK.B) | See Remarks | Buy | 483 | $225,624 |
| 2026-05-06 | BERKSHIRE HATHAWAY INC (BRK.B) | See Remarks | Buy | 53 | $24,922 |
| 2025-11-19 | Snap Inc (SNAP) | General Counsel | Sell | 70,882 | $591,156 |
| 2025-11-19 | Snap Inc (SNAP) | General Counsel | Sell | 60,094 | $0 |
| 2025-11-19 | Snap Inc (SNAP) | General Counsel | Buy | 60,094 | $0 |
| 2025-11-04 | Snap Inc (SNAP) | General Counsel | Sell | 24,000 | $185,520 |
| 2025-10-02 | Snap Inc (SNAP) | General Counsel | Sell | 24,000 | $188,640 |
| 2025-09-18 | Snap Inc (SNAP) | General Counsel | Buy | 13,200 | $0 |
| 2025-09-18 | Snap Inc (SNAP) | General Counsel | Sell | 13,200 | $0 |
| 2025-09-18 | Snap Inc (SNAP) | General Counsel | Sell | 14,290 | $108,318 |
| 2025-08-29 | Snap Inc (SNAP) | General Counsel | Sell | 24,000 | $171,840 |
| 2025-08-20 | Snap Inc (SNAP) | General Counsel | Sell | 68,705 | $493,302 |
| 2025-08-20 | Snap Inc (SNAP) | General Counsel | Sell | 62,270 | $0 |
| 2025-08-20 | Snap Inc (SNAP) | General Counsel | Buy | 62,270 | $0 |
| 2025-08-04 | Snap Inc (SNAP) | General Counsel | Sell | 24,000 | $229,680 |
| 2025-07-02 | Snap Inc (SNAP) | General Counsel | Sell | 24,000 | $209,040 |
| 2025-06-18 | Snap Inc (SNAP) | General Counsel | Sell | 14,297 | $114,948 |
| 2025-06-18 | Snap Inc (SNAP) | General Counsel | Sell | 13,194 | $0 |
| 2025-06-18 | Snap Inc (SNAP) | General Counsel | Buy | 13,194 | $0 |
| 2025-06-03 | Snap Inc (SNAP) | General Counsel | Sell | 24,000 | $195,600 |
| 2025-05-19 | Snap Inc (SNAP) | General Counsel | Sell | 62,130 | $0 |
| 2025-05-19 | Snap Inc (SNAP) | General Counsel | Sell | 68,845 | $591,379 |
Source: SEC Form 4 filings · as of 2026-08-13