InsiderSenior Vice President, General Counsel and Secretary
Michael J. O'Sullivan Insider Trading Activity
Every SEC Form 4 transaction reported by Michael J. O'Sullivan, sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Is Michael J. O'Sullivan buying or selling?
Michael J. O'Sullivan reported 2 open-market buys ($500.6K) and 99 sells ($60.0M) across 101 Form 4 filings at 2 companies — a net selling position of $59.5M.
Source: SEC EDGAR Form 4
What stands out
- Michael J. O'Sullivan has reported Form 4 transactions at 2 companies; the most active, Snap Inc (SNAP), accounts for 99 of 101 filings (98%).
- The most recent Form 4 was accepted on Aug 13, 2026 (2 months ago).
- In the last 12 months: 2 open-market purchases ($500.6K) and 2 sales ($776.6K).
- The largest open-market sale in the last 12 months was $591.0K of Snap Inc (SNAP) on Nov 20, 2025. SEC ↗
Key Statistics (as of Aug 13, 2026)
Total Form 4 filings
101
SEC EDGAR
Companies
2
Buys (2)
$500.6K
Sells (99)
$60.0M
Insider sentiment
Net sellingNet insider flow of $59.5M in net selling, filed between Feb 21, 2018 – Aug 13, 2026.
Companies Michael J. O'Sullivan files for
Recent Michael J. O'Sullivan transactions
| Date | Ticker | Role | Type | Shares | Value | Filing |
|---|---|---|---|---|---|---|
| Aug 13, 2026 | BRK-A | Senior Vice President, General Counsel and Secretary | Purchase | 488 | $250.1K | SEC ↗ |
| May 6, 2026 | BRK-A | Senior Vice President, General Counsel and Secretary | Purchase | 536 | $250.5K | SEC ↗ |
| Nov 20, 2025 | SNAP | General Counsel | Sale | 70.9K | $591.0K | SEC ↗ |
| Nov 5, 2025 | SNAP | General Counsel | Sale | 24.0K | $185.6K | SEC ↗ |
| Oct 2, 2025 | SNAP | General Counsel | Sale | 24.0K | $188.5K | SEC ↗ |
| Aug 29, 2025 | SNAP | General Counsel | Sale | 24.0K | $171.9K | SEC ↗ |
| Aug 20, 2025 | SNAP | General Counsel | Sale | 68.7K | $493.1K | SEC ↗ |
| Aug 4, 2025 | SNAP | General Counsel | Sale | 24.0K | $229.6K | SEC ↗ |
| Jul 2, 2025 | SNAP | General Counsel | Sale | 24.0K | $209.0K | SEC ↗ |
| Jun 18, 2025 | SNAP | General Counsel | Sale | 14.3K | $115.0K | SEC ↗ |
| Jun 3, 2025 | SNAP | General Counsel | Sale | 24.0K | $195.5K | SEC ↗ |
| May 19, 2025 | SNAP | General Counsel | Sale | 68.8K | $591.7K | SEC ↗ |
| May 1, 2025 | SNAP | General Counsel | Sale | 24.0K | $185.9K | SEC ↗ |
| Apr 2, 2025 | SNAP | General Counsel | Sale | 24.0K | $206.4K | SEC ↗ |
| Mar 18, 2025 | SNAP | General Counsel | Sale | 14.2K | $125.2K | SEC ↗ |
| Mar 5, 2025 | SNAP | General Counsel | Sale | 24.0K | $243.8K | SEC ↗ |
| Feb 21, 2025 | SNAP | General Counsel | Sale | 69.1K | $749.5K | SEC ↗ |
| Feb 4, 2025 | SNAP | General Counsel | Sale | 18.0K | $206.9K | SEC ↗ |
| Jan 3, 2025 | SNAP | General Counsel | Sale | 18.0K | $195.1K | SEC ↗ |
| Dec 19, 2024 | SNAP | General Counsel | Sale | 57.0K | $651.8K | SEC ↗ |
| Dec 4, 2024 | SNAP | General Counsel | Sale | 18.0K | $213.9K | SEC ↗ |
| Nov 21, 2024 | SNAP | General Counsel | Sale | 12.3K | $129.9K | SEC ↗ |
| Nov 5, 2024 | SNAP | General Counsel | Sale | 18.0K | $221.7K | SEC ↗ |
| Oct 2, 2024 | SNAP | General Counsel | Sale | 18.0K | $194.6K | SEC ↗ |
| Sep 18, 2024 | SNAP | General Counsel | Sale | 59.1K | $548.6K | SEC ↗ |
Showing the 25 most recent filings of 101. Screen every filing.
Michael J. O'Sullivan insider trading FAQ
Is Michael J. O'Sullivan buying or selling?
Across 101 SEC Form 4 filings, Michael J. O'Sullivan reported 2 open-market purchases totaling $500.6K and 99 sales totaling $60.0M — a net selling position of $59.5M.
Which companies does Michael J. O'Sullivan file Form 4s for?
Michael J. O'Sullivan has reported insider transactions at 2 companies, most often Snap Inc (SNAP), BERKSHIRE HATHAWAY INC (BRK-A).
How far back does Michael J. O'Sullivan's filing history go?
Trabud holds Michael J. O'Sullivan's SEC Form 4 filings from Feb 21, 2018 – Aug 13, 2026, sourced directly from SEC EDGAR.
Where does Trabud get Michael J. O'Sullivan's insider trading data?
Directly from SEC EDGAR Form 4 filings. Every transaction on this page is a real filing accepted by the SEC, updated as new filings arrive.
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