Onyx Pharmaceuticals, Inc. Announces Concurrent Offerings of Four Million Shares of Common Stock and $200 Million Principal Amount of Convertible Senior Notes

EMERYVILLE, Calif., Aug. 4 /PRNewswire-FirstCall/ -- Onyx Pharmaceuticals, Inc. today announced that it intends to offer, subject to market and other conditions, four million shares of its common stock and $200 million aggregate principal amount of its convertible senior notes due 2016 in concurrent underwritten public offerings. Onyx intends to grant the underwriters 30-day options to purchase up to an additional 600,000 shares of its common stock and up to an additional $30 million aggregate principal amount of its convertible senior notes in connection with the offerings. All of the shares of common stock and the notes are being offered by Onyx.

Goldman, Sachs & Co. is acting as the sole book-running manager for these offerings. The common stock offering and the convertible senior note offering are being conducted as separate public offerings by means of separate prospectus supplements, and neither of these offerings is contingent upon the consummation of the other.

This communication shall not constitute an offer to sell or the solicitation of an offer to buy the securities described herein, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. The offerings of the securities may be made only by means of a prospectus supplement and accompanying prospectus.

This news release also contains "forward-looking statements" of Onyx within the meaning of the federal securities laws. These forward-looking statements include without limitation, statements regarding expectations as to completion, timing and size of any public offering. These statements are subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including risks and uncertainties related to the financial markets. Reference should be made to Onyx's Annual Report on Form 10-K for the year ended December 31, 2008, filed with the SEC under the heading "Risk Factors" for a more detailed description of such factors, as well as Onyx's subsequent Quarterly Reports on Form 10-Q. Readers are cautioned not to place undue reliance on these forward-looking statements that speak only as of the date of this release. Onyx undertakes no obligation to update publicly any forward-looking statements to reflect new information, events or circumstances after the date of this release except as required by law.

Onyx Pharmaceuticals, Inc.



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