O'Sullivan Michael J.
- SEC CIK
- 0001713777
In the past year, 2 open-market purchase filings worth $500.6K and 3 sale filings worth $965.3K.
Current role at each company
- BRK.A Berkshire Hathaway IncSee Remarksas of Aug 13, 2026
- SNAP Snap IncGeneral Counselas of Nov 19, 2025
Open-market trades in the past year
Open-market purchases (P) and sales (S) filed in the last 365 days, not counting derivative securities or duplicate filings. Values leave out price outliers.
- Bought
- $500.6K
- 2 filings
- Sold
- $965.3K
- 3 filings
- Net
- −$464.7K
- Bought minus sold
- Companies
- 2
- With open-market trades
Trades
Every Form 4 that lists O'Sullivan Michael J. as a reporting owner, including filings made jointly with others, grouped by company. Each row adds up one type of transaction in one filing. Only open-market purchases (P) and sales (S) are shown by default.
BRK.A Berkshire Hathaway Inc
See Remarks2 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 13, 2026 (view filing)5:06 PM ET | Aug 12 | 1 day | O'Sullivan Michael J.See Remarks | PPurchaseClass B Common Stock | +488 | $512.44 | +$250.1K | +73.6%1.15K after | 3 lots |
| May 6, 2026 (view filing) | May 6 | Same day | O'Sullivan Michael J.See Remarks | PPurchaseClass B Common Stock | +536 | $467.44 | +$250.5K | +422.0%663 after | 2 lots |
SNAP Snap Inc
General Counsel71 trades
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Nov 19, 2025 (view filing) | Nov 17 | 2 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −70.9K | $8.34 | −$591.2K | −3.7%1.85M after | |
| Nov 4, 2025 (view filing) | Oct 31 | 4 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −24.0K | $7.73 | −$185.5K | −4.7%490.5K after | 10b5-1 |
| Oct 2, 2025 (view filing) | Sep 30 | 2 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −24.0K | $7.86 | −$188.6K | −4.5%514.5K after | 10b5-1 |
| Sep 18, 2025 (view filing) | Sep 16 | 2 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −14.3K | $7.58 | −$108.3K | −0.7%1.94M after | |
| Aug 29, 2025 (view filing) | Aug 29 | Same day | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −24.0K | $7.16 | −$171.8K | −4.4%525.3K after | 10b5-1 |
| Aug 20, 2025 (view filing) | Aug 18 | 2 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −68.7K | $7.18 | −$493.3K | −3.3%2.02M after | |
| Aug 4, 2025 (view filing) | Jul 31 | 4 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −24.0K | $9.57 | −$229.7K | −4.7%487.0K after | 10b5-1 |
| Jul 2, 2025 (view filing) | Jun 30 | 2 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −24.0K | $8.71 | −$209.0K | −4.5%511.0K after | 10b5-1 |
| Jun 18, 2025 (view filing) | Jun 16 | 2 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −14.3K | $8.04 | −$114.9K | −0.7%2.10M after | |
| Jun 3, 2025 (view filing) | May 30 | 4 days | O'Sullivan Michael J.General Counsel | SSaleClass A Common Stock | −24.0K | $8.15 | −$195.6K | −4.4%521.8K after | 10b5-1 |