Oncothyreon Prices $47.0 Million Public Offering Of Common Stock

SEATTLE, March 29, 2012 /PRNewswire/ - Oncothyreon Inc. (NASDAQ: ONTY) today announced that it has priced an underwritten public offering of 11,750,000 shares of its common stock at a price to the public of $4.00 per share for gross proceeds of $47.0 million. The net proceeds from the sale of the shares, after deducting the underwriters' discounts and other estimated offering expenses payable by Oncothyreon, will be approximately $43.6 million. Oncothyreon has also granted the underwriters a 30-day option to purchase up to an additional 15 percent of the shares of common stock offered in the public offering to cover overallotments, if any, which would result in additional gross proceeds of approximately $7.1 million if exercised in full.

Oncothyreon currently intends to use the net proceeds of the offering to fund the development of PX-866, Oncothyreon's irreversible pan-isoform PI-3 kinase inhibitor, and ONT-10, Oncothyreon's proprietary follow-on vaccine to Stimuvax. Stimuvax, currently in a Phase 3 pivotal trial, is a vaccine for patients with non-small cell lung cancer and is partnered with Merck KGaA. The offering proceeds may also be used for general corporate purposes. The offering is expected to close on or about April 4, 2012, subject to the satisfaction of customary closing conditions.

Cowen and Company, LLC is acting as sole book-running manager for the offering and Stifel, Nicolaus & Company, Incorporated is acting as co-manager. Cantor Fitzgerald & Co., Rodman & Renshaw, LLC and Wedbush PacGrow Life Sciences acted as financial advisors to Oncothyreon in connection with this offering.

A shelf registration statement (File # 333-178726) relating to these securities was filed on December 23, 2011, as amended on January 10, 2012, and declared effective by the Securities and Exchange Commission on January 10, 2012. A preliminary prospectus supplement related to the offering was filed with the Securities and Exchange Commission on March 28, 2012. The securities may be offered only by means of a prospectus, including a prospectus supplement, forming a part of the effective registration statement.  Copies of the prospectus supplement and accompanying prospectus relating to the offering may be obtained, when available, from Cowen and Company, LLC (c/o Broadridge Financial Services, 1155 Long Island Avenue, Edgewood, NY, 11717, Attn: Prospectus Department, Phone: [phone], Fax: [phone]). An electronic copy of the prospectus supplement and accompanying relating to the offering is available on the website of the Securities and Exchange Commission at www.sec.gov.

This press release does not constitute an offer to sell or the solicitation of offers to buy any securities of Oncothyreon, and shall not constitute an offer, solicitation or sale of any security in any state or jurisdiction 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.

About Oncothyreon

Oncothyreon is a biotechnology company specializing in the development of innovative therapeutic products for the treatment of cancer.

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