Michael J. O'Sullivan

Michael J. O'Sullivan (senior executive) discloses dealings in 2 companies, chiefly Snap Inc and Berkshire Hathaway Inc. Between 30 April 2021 and 12 August 2026, the trades on record add up to 83 filings.

In open-market terms, that means 3 purchases worth €217k on one side and 70 sales worth €25.0M on the other. On balance, insiders were net sellers of €24.8M. A purchase on the market is a deliberate choice to commit personal money, which is why it draws more attention than a grant. Besides market trades, the filings include 7 share grants. So far in 2026, the count stands at 3 purchases and no sales.

A typical purchase (the median) is worth €20k. None of the 3 purchases we analysed coincided with buying by another insider of the same company within 30 days.

Most recently, on 13 August 2026, the filings show an open-market purchase worth €20k in Berkshire Hathaway Inc. The median gap between a trade and its publication by SEC (Form 4) is 2 days. The legal deadline for a Form 4 is two business days after the transaction. Selling is not necessarily a view on the stock: liquidity needs and diversification are common motives. These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.