O'Sullivan Michael J.
SEC insider (Form 3/4/5 filer). CIK 0001713777. Officer at BERKSHIRE HATHAWAY INC (BRK.B) and 1 other issuer. 51 reported Form 4/5 transactions since Sep 2024; latest on Aug 12, 2026. Located in OMAHA, NE.
Companies O'Sullivan Michael J. has filed insider reports for
- BERKSHIRE HATHAWAY INC (BRK.B): Officer, See Remarks
- Snap Inc (SNAP): Officer, General Counsel
O'Sullivan Michael J.
CIK: 0001713777
Transaction Breakdown
Open Market Buys (P)5 (9.8%)
High conviction signal
Open Market Sales (S)25 (49.0%)
Position reduction
Option Exercises (M)0 (0.0%)
Derivative conversions
Awards (A)1 (2.0%)
Compensation grants
Other (G, F, J, C, D, …)20 (39.2%)
Gifts, tax withholding, conversions, dispositions to the issuer and other codes
Discretionary Trading P&L
Holdings
Transaction History (51 total)
- Aug 12, 2026BRK.B
BERKSHIRE HATHAWAY INC
PurchaseIndirect45 shares at avg. $510.64$23K - Aug 12, 2026BRK.B
BERKSHIRE HATHAWAY INC
PurchaseIndirect43 shares at avg. $513.61$22K - Aug 12, 2026BRK.B
BERKSHIRE HATHAWAY INC
PurchaseIndirect400 shares at avg. $512.52$205K - May 6, 2026BRK.B
BERKSHIRE HATHAWAY INC
PurchaseIndirect53 shares at avg. $470.22$25K - May 6, 2026BRK.B
BERKSHIRE HATHAWAY INC
PurchaseIndirect483 shares at avg. $467.13$226K - Nov 17, 2025SNAP
Snap Inc
OtherDirect60.1K shares- - Nov 17, 2025SNAP
Snap Inc
SaleDirect70.9K shares at avg. $8.34$591K - Nov 17, 2025SNAP
Snap Inc
OtherIndirect60.1K shares- - Oct 31, 2025SNAP
Snap Inc
SaleIndirect24K shares at avg. $7.73$186K - Sep 30, 2025SNAP
Snap Inc
SaleIndirect24K shares at avg. $7.86$189K
| Type | Shares | Price | Ownership | |||
|---|---|---|---|---|---|---|
| Aug 12, 2026 |  BRK.B BERKSHIRE HATHAWAY INC | Purchase | 45 | $510.64 | $22,979 | Indirect |
| Aug 12, 2026 | BRK.B BERKSHIRE HATHAWAY INC | Purchase | 43 | $513.61 | $22,085 | Indirect |
| Aug 12, 2026 | BRK.B BERKSHIRE HATHAWAY INC | Purchase | 400 | $512.52 | $205,008 | Indirect |
| May 6, 2026 | BRK.B BERKSHIRE HATHAWAY INC | Purchase | 53 | $470.22 | $24,922 | Indirect |
| May 6, 2026 | BRK.B BERKSHIRE HATHAWAY INC | Purchase | 483 | $467.13 | $225,624 | Indirect |
| Nov 17, 2025 |  SNAP Snap Inc | Other | 60,094 | - | - | Direct |
| Nov 17, 2025 | SNAP Snap Inc | Sale | 70,882 | $8.34 | $591,021 | Direct |
| Nov 17, 2025 | SNAP Snap Inc | Other | 60,094 | - | - | Indirect |
| Oct 31, 2025 | SNAP Snap Inc | Sale | 24,000 | $7.73 | $185,623 | Indirect |
| Sep 30, 2025 | SNAP Snap Inc | Sale | 24,000 | $7.86 | $188,544 | Indirect |
1-10 of 51 transactions
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