Sangamo BioSciences, Inc. Announces Closing of $74.2 Million Public Offering of Common Stock

Sangamo BioSciences Announces Closing Of $74.2 Million Public Offering Of Common Stock And Exercise Of Over-Allotment Option

RICHMOND, Calif., Sept. 23, 2013 /PRNewswire/ -- Sangamo BioSciences, Inc. (Nasdaq: SGMO) today announced the closing of its previously announced underwritten public offering of 6,100,000 shares of its common stock, as well as 915,000 additional shares of its common stock pursuant to the full exercise of the over-allotment option granted to the underwriters.

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The shares were sold at the public offering price of $10.58 per share, the last closing price of the stock on the date immediately prior to pricing. This brings the aggregate gross proceeds from the offering to approximately $74.2 million, before deducting underwriting discounts and commissions and other offering expenses.

Lazard Capital Markets LLC, JMP Securities LLC and Piper Jaffray & Co. acted as joint book-running managers and Cowen and Company, LLC acted as co-lead manager for the offering.

The shares described above were issued pursuant to a prospectus supplement and accompanying prospectus, all as filed as part of a shelf registration statement on Form S-3 previously filed with and declared effective by the Securities and Exchange Commission ("SEC"). The company filed a final prospectus supplement relating to the offering with the SEC on September 19, 2013, which is available along with the accompanying prospectus filed with the SEC in connection with the shelf registration, on the SEC's website at www.sec.gov. Copies of the final prospectus supplement and the accompanying prospectus may be obtained by sending a request to: Lazard Capital Markets LLC, 30 Rockefeller Plaza, 60th Floor, New York, NY 10020, or via telephone at 800-542-0970; or JMP Securities LLC, Attention: Prospectus Department, 600 Montgomery Street, 10th Floor, San Francisco, CA 94111, or via telephone at 415-835-8985; or Piper Jaffray & Co., Attention: Prospectus Department, 800 Nicollet Mall, J12S03, Minneapolis, MN 55402, or via telephone at 800-747-3924.

This press release does not constitute an offer to sell or a solicitation of an offer to buy any securities of Sangamo, nor shall there be any sale of securities in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction. This press release is being issued pursuant to and in accordance with Rule 134 under the Securities Act of 1933, as amended.

About Sangamo
Sangamo BioSciences, Inc. is focused on research and development of novel DNA-binding proteins for therapeutic gene regulation and genome editing. The Company has ongoing Phase 2 and Phase 1/2 clinical trials to evaluate the safety and efficacy of a novel ZFP Therapeutic^® for the treatment of HIV/AIDS. Sangamo's other therapeutic programs are focused on monogenic diseases, including hemophilia and hemoglobinopathies such as sickle cell anemia and beta-thalassemia, and a program in Huntington's disease. Sangamo's core competencies enable the engineering of a class of DNA-binding proteins known as zinc finger DNA-binding proteins (ZFPs). Engineering of ZFPs that recognize a specific DNA sequence enables the creation of sequence-specific ZFP Nucleases (ZFNs) for gene modification and ZFP transcription factors (ZFP TFs) that can control gene expression and, consequently, cell function. Sangamo has entered into a strategic collaboration with Shire AG to develop therapeutics for hemophilia, Huntington's disease and other monogenic diseases, and it has also established strategic partnerships with companies in non-therapeutic applications of its technology including Dow AgroSciences and Sigma-Aldrich Corporation. For more information about Sangamo, visit the company's website at www.sangamo.com

ZFP Therapeutic^® is a registered trademark of Sangamo BioSciences, Inc.

This press release may contain forward-looking statements based on Sangamo's current expectations. These forward-looking statements include, without limitation, the research and development of novel ZFP TFs and ZFNs and therapeutic applications of Sangamo's ZFP technology platform. Actual results may differ materially from these forward-looking statements due to a number of factors, including technological challenges, Sangamo's ability to develop commercially viable products and technological developments by our competitors. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this press release. Additional risks and uncertainties relating to Sangamo and its business can be found under the heading "Risk Factors" in Sangamo's Annual Report on Form 10-K and most recent Quarterly Report on Form 10-Q, and in the preliminary prospectus supplement related to the offering which has been filed with the SEC. Sangamo BioSciences, Inc. assumes no obligation to update the forward-looking information contained in this press release.

SOURCE Sangamo BioSciences, Inc.