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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
1197018	Anthony N Coles	C/O Onyx Pharmaceuticals, Inc. 249 East Grand Ave. South San Francisco CA 94080	President & Ceo	Yes	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	Explanation
Common Stock	Acquisiton	2012-08-08	250,000	$29.03	379,033	No	4	M	Direct
Common Stock	Disposition	2012-08-08	270,690	$72.18	108,343	No	4	S	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	StockOption (Right to Buy)	Disposition	2012-08-08	250,000	$0.00	250,000	$29.03

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
100,000		2018-03-30	No	4	M	Direct

Footnotes

Reflects the forfeiture of 25,000 performance restricted stock units.
The shares were sold at prices between $72.00 and $72.45. 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.
Twenty-Five percent of the shares subject to the option vested and became exercisable on March 31, 2009. The remaining shares vest and become exercisable at a rate of 1/48th per month thereafter.