Common stock (Tables)

6 Months Ended

Jun. 30, 2013

Changes in issued and outstanding Berkshire common stock

Changes in Berkshire’s issued and outstanding common stock during the first six months of 2013 are shown in the table below.

	Class A, $5 Par Value (1,650,000 shares authorized)									Class B, $0.0033 Par Value (3,225,000,000 shares authorized)
	Issued			Treasury			Outstanding			Issued		Treasury			Outstanding
Balance at December 31, 2012		904,528			(9,573	)		894,955			1,123,393,956		(1,408,484	)		1,121,985,472
Conversions of Class A common stock to Class B common stock and exercises of replacement stock options issued in a business acquisition		(10,681	)		—			(10,681	)		17,218,449		—			17,218,449
Balance at June 30, 2013		893,847			(9,573	)		884,274			1,140,612,405		(1,408,484	)		1,139,203,921