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Common stock (Tables)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Changes in issued, treasury and outstanding Berkshire common stock

Changes in Berkshire’s issued, treasury and outstanding common stock during the six months ending June 30, 2018 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, 2017

     762,755         (11,680)        751,075         1,342,066,749         (1,409,762)        1,340,656,987   

Conversions of Class A common stock to Class B common stock and exercises of 
replacement stock options issued in a business acquisition

     (4,560)        —         (4,560)        7,181,203         —         7,181,203   
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

Balance at June 30, 2018

             758,195                 (11,680)                746,515          1,349,247,952           (1,409,762)         1,347,838,190