(23) Quarterly data

A summary of revenues and earnings by quarter for each of the last two years is presented in the following table. This information is unaudited. Dollars are in millions, except per share amounts.


	1^stQuarter		2^ndQuarter		3^rdQuarter		4^thQuarter
2012
Revenues	$	38,147	$	38,546	$	41,050	$	44,720
Net earnings attributable to Berkshire *		3,245		3,108		3,920		4,551
Net earnings attributable to Berkshire per equivalent Class A common share		1,966		1,882		2,373		2,757
2011
Revenues	$	33,720	$	38,274	$	33,739	$	37,955
Net earnings attributable to Berkshire *		1,511		3,417		2,278		3,048
Net earnings attributable to Berkshire per equivalent Class A common share		917		2,072		1,380		1,846

Includes realized investment gains/losses, other-than-temporary impairment losses on investments and derivative gains/losses. Derivative gains/losses include significant amounts related to non-cash changes in the fair value of long-term contracts arising from short-term changes in equity prices, interest rates and foreign currency rates, among other factors. After-tax investment and derivative gains/losses for the periods presented above are as follows (in millions):


	1^st Quarter			2^nd Quarter			3^rd Quarter			4^th Quarter
Investment and derivative gains/losses – 2012	$	580		$	(612	)	$	521		$	1,738
Investment and derivative gains/losses – 2011		(82	)		713			(1,534	)		382