Company:  ONYX PHARMACEUTICALS INC (ONXX)
Form Type:  4
Filing Date:  5/3/2012 
CIK:  0001012140 
Address:  249 E. GRAND AVE. 
City, State, Zip:  SOUTH SAN FRANCISCO, California 94080 
Telephone:  650-266-0000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$95.15  
Change: 
-1.05 (-1.09%)  
Trade Time: 
02:34 PM EST  
Market Cap: 
$6.92B
Description of Business
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  FORM 4
    NAME AND TITLE
    NON DERIVATIVE SECURITIES
    DERIVATIVE SECURITIES
    EXPLANATIONS AND REMARKS
    REPORTING OWNERS
    SIGNATURES