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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 E. Grand Ave. South San Francisco CA 94080	Chairman & 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
Common Stock	Acquisiton	2013-03-28	10,938	$35.18	119,392	No	4	M	Direct
Common Stock	Disposition	2013-03-28	10,938	$90.00	108,454	No	4	S	Direct
Common Stock	Acquisiton	2013-03-28	26,800	$0.00	135,254	No	4	A	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	A	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	2013-03-28	10,938	$0.00	10,938	$35.18
Common Stock	Stock Option (Right to Buy)	Acquisiton	2013-03-28	75,300	$0.00	75,300	$88.86

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
54,687		2021-03-31	No	4	M	Direct
75,300		2023-03-27	No	4	A	Direct

Footnotes

Shares sold pursuant to a 10b5-1 Plan.
Represents restricted stock units granted to the reporting person. Each restricted stock unit represents a right to receive one share of the issuer's common stock. The restricted stock units vest annually over four years.
12.5% of the shares subject to the option become exercisable 6 months following the date of grant. The remaining shares become exercisable in equal monthly installments over the following 42 months for a total vesting of 48 months.
Includes shares purchased through the issuer's ESPP.