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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1012140	Onyx Pharmaceuticals Inc	ONXX	Biological Products, (No Disgnostic Substances) (2836)	943154463

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1397266	K Matthew Fust	C/O Onyx Pharmaceuticals, Inc. 249 E. Grand Ave. South San Francisco CA 94080	Evp & Chief Financial Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2013-01-10	7,112	$34.48	60,400	No	4	M	Direct
Common Stock	Disposition	2013-01-10	6,900	$84.41	53,500	No	4	S	Direct
Common Stock	Disposition	2013-01-10	3,299	$85.83	50,201	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2013-01-10	7,112	$0.00	7,112	$34.48

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
63,930		2019-01-05	No	4	M	Direct

Footnotes

Includes 165 shares purchased through the issuer's ESPP on 12/31/12.
Shares sold pursuant to a 10b5-1 plan.
Twenty-Five percent of the shares subject to the option vest and become exercisable one year from the date of grant and vest and become exercisable at a rate of 1/48th per month thereafter.
The shares were sold at prices ranging from $83.92 to $84.6901. The reporting person will provide upon request to the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.
The shares were sold at prices ranging from $85.82 to $85.84. The reporting person will provide upon request to the SEC, the issuer or security holder of the issuer, full information regarding the number of shares sold at each separate price.