Michael J. O'Sullivan insider trades: Berkshire Hathaway (BRK.B) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Michael reports to the SEC
Open-market buys and sales
104 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Aug 12, 2026 | BRK.B | ↑ Buy | 488 | $512.44 | $250K | By Trust | Aug 13, 2026 (1d) |
| May 6, 2026 | BRK.B | ↑ Buy | 536 | $467.44 | $251K | By Trust | May 6, 2026 (0d) |
| Nov 17, 2025 | SNAP | ↓ Sell | 70,882 | $8.34 | $591K | Direct | Nov 19, 2025 (2d) |
| Oct 31, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $7.73 | $186K | By Trust | Nov 4, 2025 (4d) |
| Sep 30, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $7.86 | $189K | By Trust | Oct 2, 2025 (2d) |
| Sep 16, 2025 | SNAP | ↓ Sell | 14,290 | $7.58 | $108K | Direct | Sep 18, 2025 (2d) |
| Aug 29, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $7.16 | $172K | By Trust | Aug 29, 2025 (0d) |
| Aug 18, 2025 | SNAP | ↓ Sell | 68,705 | $7.18 | $493K | Direct | Aug 20, 2025 (2d) |
| Jul 31, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $9.57 | $230K | By Trust | Aug 4, 2025 (4d) |
| Jun 30, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $8.71 | $209K | By Trust | Jul 2, 2025 (2d) |
| Jun 16, 2025 | SNAP | ↓ Sell | 14,297 | $8.04 | $115K | Direct | Jun 18, 2025 (2d) |
| May 30, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $8.15 | $196K | By Trust | Jun 3, 2025 (4d) |
| May 16, 2025 | SNAP | ↓ Sell | 68,845 | $8.59 | $592K | Direct | May 19, 2025 (3d) |
| Apr 30, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $7.74 | $186K | By Trust | May 1, 2025 (1d) |
| Mar 31, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $8.60 | $206K | By Trust | Apr 2, 2025 (2d) |
| Mar 17, 2025 | SNAP | ↓ Sell | 14,183 | $8.83 | $125K | Direct | Mar 18, 2025 (1d) |
| Feb 28, 2025 | SNAP | ↓ Sell10b5-1 | 24,000 | $10.16 | $244K | By Trust | Mar 4, 2025 (4d) |
| Feb 18, 2025 | SNAP | ↓ Sell | 69,119 | $10.84 | $749K | Direct | Feb 20, 2025 (2d) |
| Jan 31, 2025 | SNAP | ↓ Sell10b5-1 | 18,000 | $11.49 | $207K | By Trust | Feb 3, 2025 (3d) |
| Dec 31, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $10.84 | $195K | By Trust | Jan 2, 2025 (2d) |
| Dec 16, 2024 | SNAP | ↓ Sell | 56,961 | $11.44 | $652K | Direct | Dec 18, 2024 (2d) |
| Nov 29, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $11.89 | $214K | By Trust | Dec 3, 2024 (4d) |
| Nov 18, 2024 | SNAP | ↓ Sell | 12,315 | $10.54 | $130K | Direct | Nov 20, 2024 (2d) |
| Oct 31, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $12.31 | $222K | By Trust | Nov 4, 2024 (4d) |
| Sep 30, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $10.81 | $195K | By Trust | Oct 2, 2024 (2d) |
| Sep 16, 2024 | SNAP | ↓ Sell | 59,053 | $9.29 | $549K | Direct | Sep 18, 2024 (2d) |
| Aug 30, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $9.30 | $167K | By Trust | Sep 4, 2024 (5d) |
| Aug 16, 2024 | SNAP | ↓ Sell | 12,512 | $9.11 | $114K | Direct | Aug 20, 2024 (4d) |
| Jul 31, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $13.28 | $239K | By Trust | Aug 2, 2024 (2d) |
| Jun 28, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $16.56 | $298K | By Trust | Jul 2, 2024 (4d) |
| Jun 17, 2024 | SNAP | ↓ Sell | 58,924 | $15.51 | $914K | Direct | Jun 20, 2024 (3d) |
| May 31, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $15.01 | $270K | By Trust | Jun 4, 2024 (4d) |
| May 16, 2024 | SNAP | ↓ Sell | 12,695 | $15.91 | $202K | Direct | May 20, 2024 (4d) |
| Apr 30, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $15.10 | $272K | By Trust | May 2, 2024 (2d) |
| Mar 28, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $11.53 | $208K | By Trust | Apr 1, 2024 (4d) |
| Mar 18, 2024 | SNAP | ↓ Sell | 59,641 | $11.00 | $656K | Direct | Mar 20, 2024 (2d) |
| Feb 29, 2024 | SNAP | ↓ Sell10b5-1 | 18,000 | $11.06 | $199K | By Trust | Mar 4, 2024 (4d) |
| Feb 29, 2024 | SNAP | ↓ Sell10b5-1 | 160 | $11.06 | $2K | Direct | Mar 4, 2024 (4d) |
| Jan 31, 2024 | SNAP | ↓ Sell10b5-1 | 13,000 | $16.16 | $210K | By Trust | Feb 2, 2024 (2d) |
| Dec 15, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $16.88 | $219K | By Trust | Dec 19, 2023 (4d) |
| Nov 30, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $13.83 | $180K | By Trust | Dec 1, 2023 (1d) |
| Nov 16, 2023 | SNAP | ↓ Sell | 35,683 | $11.90 | $425K | Direct | Nov 20, 2023 (4d) |
| Oct 31, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $9.93 | $129K | By Trust | Nov 2, 2023 (2d) |
| Sep 29, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $8.75 | $114K | By Trust | Oct 3, 2023 (4d) |
| Aug 31, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $10.33 | $134K | By Trust | Sep 1, 2023 (1d) |
| Aug 16, 2023 | SNAP | ↓ Sell | 36,037 | $9.23 | $333K | Direct | Aug 18, 2023 (2d) |
| Jul 31, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $11.22 | $146K | By Trust | Aug 2, 2023 (2d) |
| Jun 30, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $11.87 | $154K | By Trust | Jul 5, 2023 (5d) |
| May 31, 2023 | SNAP | ↓ Sell10b5-1 | 13,000 | $9.99 | $130K | By Trust | Jun 2, 2023 (2d) |
| May 16, 2023 | SNAP | ↓ Sell | 60,793 | $8.51 | $518K | Direct | May 18, 2023 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
About Michael J. O'Sullivan's insider trades
Michael J. O'Sullivan is See Remarks at Berkshire Hathaway (BRK.B). Since Nov 16, 2017, Michael has reported 2 open-market purchases worth $501K and 102 sales worth $58.6M on SEC Form 4. In the last 12 months: 2 buys ($501K) and 1 sale ($591K).
65 sales (38% of the value sold) were made under a Rule 10b5-1 trading plan, which is set up months in advance and runs on a schedule, so they say little about how the insider sees the stock today.
Their filings also include other transactions (28 filings), grants and awards (12 filings), inherited shares (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every BRK.B insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.