Michael J. O'Sullivan - 12 Aug 2026 Form 4 Insider Report for BERKSHIRE HATHAWAY INC (BRK.B)

Reporting relationship: Senior Vice President, General Counsel and Secretary
Issuer ticker: BRK.B
Reported as of: 12 Aug 2026
Net transaction value: +$250,072
SEC form: 4
Accepted by SEC: 13 Aug 2026, 17:06:55 UTC
Prior SEC filing: 06 May 2026
Source filing: View source filing
Reporting owner signature: /s/ Michael O'Sullivan

Key filing fact

Michael J. O'Sullivan filed Form 4 for BERKSHIRE HATHAWAY INC (BRK.B) on 13 Aug 2026.

Key facts

This page summarizes Michael J. O'Sullivan's Form 4 filing for BERKSHIRE HATHAWAY INC (BRK.B).
3 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 13 Aug 2026, 17:06.

Change

Previous filing in this sequence was filed on 06 May 2026.
Current net transaction value: +$250,072.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001713777 Primary reporting owner

O'Sullivan Michael J.

Relationship: Senior Vice President, General Counsel and Secretary
Address: 3555 FARNAM STREET, OMAHA
Signature: /s/ Michael O'Sullivan
Signature date: 13 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

BRK.B transaction

Class B Common Stock

Purchase

Transaction value: $22,979
Shares: +45
Change %: +6.8%
Price: $510.64
Shares after: 708
Date: 12 Aug 2026
Ownership: By Trust
Footnotes: F1, F4

BRK.B transaction

Class B Common Stock

Purchase

Transaction value: $205,008
Shares: +400
Change %: +56%
Price: $512.52
Shares after: 1,108
Date: 12 Aug 2026
Ownership: By Trust
Footnotes: F2, F4

BRK.B transaction

Class B Common Stock

Purchase

Transaction value: $22,085
Shares: +43
Change %: +3.9%
Price: $513.61
Shares after: 1,151
Date: 12 Aug 2026
Ownership: By Trust
Footnotes: F3, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $510.58 to $510.68 per share, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Footnote F2

The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $512.42 to $512.54 per share, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Footnote F3

The reported price in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $513.60 to $513.64 per share, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote.

Footnote F4

Shares held by a living trust of which the reporting person is trustee.

SEC remarks

Senior Vice President, General Counsel and Secretary