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  4. [Form 4] BERKSHIRE HATHAWAY INC Insider Trading Activity

Berkshire Hathaway (BRK) legal executive purchases 488 Class B shares via trust

Filing Impact
(Moderate)
Filing Sentiment
(Positive)
Form Type
4

Rhea-AI Filing Summary

BERKSHIRE HATHAWAY INC insider Michael J. O'Sullivan, Senior Vice President, General Counsel and Secretary, reported three open-market purchases of Class B common stock on August 12, 2026. A living trust for which he serves as trustee acquired a total of 488 shares in indirect ownership. The trades were executed at weighted average prices of $510.64 for 45 shares, $512.52 for 400 shares, and $513.61 for 43 shares, each reflecting multiple transactions within narrow price ranges. The filing indicates these transactions were not made pursuant to a Rule 10b5-1 trading plan.

Positive

  • None.

Negative

  • None.
Insider O'Sullivan Michael J.
Role See Remarks
Bought 488 shs ($250K)
Type Security Shares Price Value
Purchase Class B Common Stock F1, F4 45 $510.64 $23K
Purchase Class B Common Stock F2, F4 400 $512.52 $205K
Purchase Class B Common Stock F3, F4 43 $513.61 $22K
Holdings After Transaction: Class B Common Stock — 1,151 shares (Indirect, By Trust)
Footnotes (4)
  1. 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.
  2. 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.
  3. 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.
  4. F4. Shares held by a living trust of which the reporting person is trustee.
Shares purchased (block 1) 45 shares at $510.64 Indirect purchase of Class B Common Stock on 2026-08-12
Shares purchased (block 2) 400 shares at $512.52 Indirect purchase of Class B Common Stock on 2026-08-12
Shares purchased (block 3) 43 shares at $513.61 Indirect purchase of Class B Common Stock on 2026-08-12
Total shares purchased 488 shares Sum of all reported Class B Common Stock purchases in this filing
Price range block 1 $510.58–$510.68 Weighted average price range for 45-share purchase
Price range block 2 $512.42–$512.54 Weighted average price range for 400-share purchase
Price range block 3 $513.60–$513.64 Weighted average price range for 43-share purchase
weighted average price financial
"The reported price in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
living trust financial
"Shares held by a living trust of which the reporting person is trustee."
indirect financial
"Shares reported as indirect ownership with nature of ownership "By Trust"."
Rule 10b5-1 regulatory
"The Rule 10b5-1 checkbox is not marked for these transactions."
Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transactions did BRK report for Michael J. O'Sullivan?
Michael J. O'Sullivan reported three open-market purchases of Berkshire Hathaway Class B common stock on August 12, 2026. In total, a living trust he oversees acquired 488 shares through these transactions at weighted average prices just above $510 per share.

How many Berkshire Hathaway (BRK) shares were bought in this Form 4?
The Form 4 shows that a trust associated with Michael J. O'Sullivan acquired 488 shares of Berkshire Hathaway Class B common stock. These were split into trades of 45, 400, and 43 shares, each reported at a separate weighted average price per share.

What prices were paid for the Berkshire Hathaway (BRK) shares in this filing?
The reported weighted average purchase prices were $510.64 for 45 shares, $512.52 for 400 shares, and $513.61 for 43 shares. Footnotes explain that each figure reflects multiple trades within narrow price ranges around the stated averages.

Were the Berkshire Hathaway (BRK) insider purchases made under a Rule 10b5-1 plan?
The filing indicates these transactions were not made pursuant to a Rule 10b5-1 trading plan. The Rule 10b5-1 checkbox is marked false, and the footnotes do not describe any pre-arranged trading arrangement for these purchases.

How are the Berkshire Hathaway (BRK) shares held after Michael J. O'Sullivan’s purchases?
The acquired shares are reported as held indirectly “By Trust.” A footnote clarifies they are held by a living trust of which Michael J. O'Sullivan is trustee, indicating trust-level ownership rather than direct personal registration.

What role does the reporting person in this BRK Form 4 hold at Berkshire Hathaway?
The reporting person, Michael J. O'Sullivan, serves as Senior Vice President, General Counsel and Secretary of Berkshire Hathaway Inc. This officer position is noted in the remarks, providing context for his insider status in the company.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
O'Sullivan Michael J.
(Last)(First)(Middle)
3555 FARNAM STREET
(Street)
OMAHA NEBRASKA 68131
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
BERKSHIRE HATHAWAY INC [ BRK.B ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
See Remarks
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/12/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Class B Common Stock08/12/2026P45A$510.64(1)708IBy Trust(4)
Class B Common Stock08/12/2026P400A$512.52(2)1,108IBy Trust(4)
Class B Common Stock08/12/2026P43A$513.61(3)1,151IBy Trust(4)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. 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.
2. 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.
3. 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.
4. Shares held by a living trust of which the reporting person is trustee.
Remarks:
Senior Vice President, General Counsel and Secretary
/s/ Michael O'Sullivan08/13/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR