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Berkshire Hathaway (BRK.B)See Remarks bought ~$226K

Michael J. O'sullivan, See Remarks at Berkshire Hathaway, bought ~$226K of Berkshire Hathaway shares.

~$226K
Approx. value · 483 sh @ $467.13
610
Holds after · shares reported
Traded
May 6, 2026
Filed
May 6, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

  1. Feb 10, 2026Congress · 1 personMembers of Congress: 3 sales
  2. Mar 13, 2026CongressDisclosed purchase of BRK.B — reported range $15,001 - $50,000
  3. Mar 16, 2026Congress · 2 peopleMembers of Congress: 2 sales
  4. Mar 25, 2026CongressDisclosed partial sale of BRK.B — reported range $1,001 - $15,000
  5. Mar 26, 20265% stakeThe Vanguard Group reported a passive stake (13G)
  6. Mar 27, 2026CongressDisclosed purchase of BRK.B — reported range $50,001 - $100,000
  7. Mar 31, 2026CongressDisclosed sale of BRK.B — reported range $100,001 - $250,000
  8. Apr 10, 2026Government · Federal Register noticeNotice of Lodging of Proposed Consent Decree Under the Comprehensive Environmental Response, Compensation, and Liability Act
  9. Apr 16, 2026Federal contract · $8.6M obligatedDepartment of Defense awarded Berkshire Hathaway: $8.62M obligated to date
  10. Apr 29, 20265% stakeVanguard Capital Management reported a passive stake (13G) of 9.7%
  11. May 2, 2026Company filing · Form 8-K · Results, Executive changeChanged a top executive or board member, and reported its results (and 2 more items)“(c) As previously announced, Charles C. Chang will succeed Marc D. Hamburg as Berkshire’s Chief Financial Officer on June 1, 2026. In his new role, Mr. Chang will be paid an annual cash salary of $8,000,000.”
  12. May 4, 2026Congress · 1 personMembers of Congress: 2 sales
  13. May 6, 2026 · this disclosureInsider · First insider buy since Sep 2022Officer purchased ~$226K of BRK.B shares in the open market

What came next

  1. May 6, 2026Insider · First insider buy since Sep 2022Officer purchased ~$25K of BRK.B shares in the open market
  2. May 27, 2026Congress · 1 personMembers of Congress: 4 purchases
  3. May 28, 2026FDA · NHTSA campaign 26V347000Vehicle recall of 385 units: equipment adaptive/mobility, wheelchair restraints/securement, critical fasteners
  4. May 29, 2026FDA · NHTSA campaign 26V352000Vehicle recall of 2,338 units: equipment, electrical
  5. Jun 15, 2026FDA · NHTSA campaign 26V390000Vehicle recall of 38 units: equipment, other, labels
  6. Jun 22, 2026FDA · NHTSA campaign 26V398000Vehicle recall of 1,824 units: electrical system, wiring, fuses and circuit breakers
  7. Jun 23, 2026CongressDisclosed purchase of BRK.B — reported range $15,001 - $50,000
  8. Jul 8, 2026FDA · NHTSA campaign 26V439000Vehicle recall of 18 units: equipment, other, labels
  9. Jul 15, 20265% stakeWarren E. Buffett filed an activist stake (13D) of 38.2%
  10. Jul 23, 2026FDA · NHTSA campaign 26V477000Vehicle recall of 69 units: electrical system
  11. Jul 23, 2026FDA · NHTSA campaign 26V476000Vehicle recall of 804 units: equipment, other, labels
  12. Jul 28, 2026Congress · 1 personMembers of Congress: 2 purchases
  13. Jul 30, 2026CongressDisclosed purchase of BRK.B — reported range $1,001 - $15,000
  14. Aug 3, 2026FDA · NHTSA campaign 26V503000Vehicle recall of 21 units: electrical system, wiring
  15. Aug 8, 2026Company filing · Form 8-K · ResultsReported its results
  16. Aug 12, 2026Federal contract · $5.7M obligatedDepartment of the Treasury awarded Berkshire Hathaway: $5.74M obligated to date
  17. Aug 12, 2026Insider · 1 personInsiders: 3 purchases (~$250K)
  18. Sep 1, 2026FDA · NHTSA campaign 26V563000Vehicle recall of 5 units: equipment, recreational vehicle/trailer, lpg systems
  19. Sep 1, 2026FDA · NHTSA campaign 26V565000Vehicle recall of 55 units: equipment adaptive/mobility, wheelchair lift/ramp, controls/control wiring
View the official recordSEC Form 4

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Berkshire Hathaway

For Berkshire Hathaway, OQRO holds 4 insider filings (SEC Form 4 or Form 144), 7 Congress trade reports, 139 fund holdings reports (13F) and 1 federal contract award dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its BRK.B page.

Other recent filings by Michael J. O'sullivan, See Remarks

The full history of Michael J. O'sullivan, See Remarks is on the profile page.

How this filing works

Other disclosures at Berkshire Hathaway

Everything OQRO holds on this company is on its BRK.B page.

This is one filing. OQRO holds the rest

Insider trades filed with the SEC, stock trades disclosed by members of Congress, fund holdings from 13F filings and federal contract awards, each one in plain words next to its official filing. On this page it opens why the trade stands out, what the company did around that time, the price since, and every field of the form.

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