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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1067983	Berkshire Hathaway Inc	BRK.A	Fire, Marine & Casualty Insurance (6331)	470813844

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1192668	L Ronald Olson	355 South Grand Avenue 35Th Floor Los Angeles CA 90071		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class B Common Stock	Acquisiton	2012-12-18	1,000	$90.00	1,000	No	4	P	Direct
Class B Common Stock	Acquisiton	2012-12-18	1,500	$90.00	2,500	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct
No	4	P	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
See Footnote 3	Class A Common Stock	Acquisiton	2012-12-18	10	$135,000.00	0	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
140			No	4	P	Indirect

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Class B Common Stock	15,000	Indirect	By Ronald & Jane Olson Living Trust

Reported Derivative Holdings

Sec. Name	Sec. Type	Price	Date	Expiration Date	Amount	Remaning Holdings	Nature of Ownership
See Footnote 3	Class A Common Stock	$0.00			0	20	Direct

Expiration Date	Amount	Remaning Holdings	Nature of Ownership
	0	20	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $90.00 to $90.0067. The reporting person undertakes to provide to Berkshire Hathaway Inc. ("Berkshire"), any security holder of Berkshire, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 1 and 2 to this Form 4.
The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $89.9925 to $90.00.
Each share of Class A Common Stock is convertible at any time at the option of the holder into 1,500 shares of Class B Common Stock. In accordance with the instructions to Form 4, my holdings of, and transactions in, shares of Class A Common Stock are reported in Table II.
Not applicable.