SEC Form 4 reporting owner

O'Sullivan Michael J.

O'Sullivan Michael J. has filed 5 Form 4 transactions reported between May 6, 2026 and August 12, 2026, as a reporting owner of BERKSHIRE HATHAWAY INC.

Name as filed: O'Sullivan Michael J.

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
None
reported
Companies
1
with Form 4 filings
Latest transaction
Aug 12, 2026
transaction date

Roles and reported holdings

  • BRK-ABERKSHIRE HATHAWAY INC
    May 6, 2026 – Aug 12, 2026

    Reporting owner

    No common-stock holding reported on a purchase, sale, gift or withholding line.

    5 lines are priced far from BRK-A’s market price that day, so the filing may concern a different security. Left out of totals and holdings; see the filings.

Transaction history

All 5 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Aug 12, 2026BRK-AOpen-market purchaseCode P · indirectPrice far from market; may be another security43$22K@ $513.61Form 4
Aug 12, 2026BRK-AOpen-market purchaseCode P · indirectPrice far from market; may be another security400$205K@ $512.52Form 4
Aug 12, 2026BRK-AOpen-market purchaseCode P · indirectPrice far from market; may be another security45$23K@ $510.64Form 4
May 6, 2026BRK-AOpen-market purchaseCode P · indirectPrice far from market; may be another security53$25K@ $470.22Form 4
May 6, 2026BRK-AOpen-market purchaseCode P · indirectPrice far from market; may be another security483$226K@ $467.13Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

5 open-market lines are priced outside 0.67×–1.5× of the stock’s closing price that day. A gap that large usually means the filing reports a different security than the company it is filed under, so those lines are shown but left out of totals and holdings.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.