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Common stock (Tables)
9 Months Ended
Sep. 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 nine months ending September 30, 2018 are shown in the table below. In addition to our common stock, 1,000,000 shares of preferred stock are authorized, but none are issued.

 

     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

     (16,850)        —         (16,850)        25,886,063         —         25,886,063   

Treasury stock acquired

     —         (225)        (225)        —         (4,139,192)        (4,139,192)  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

    

 

 

 

Balance at September 30, 2018

     745,905         (11,905)        734,000         1,367,952,812         (5,548,954)        1,362,403,858