NantKwest Files Registration Statement for Proposed Initial Public Offering

Jun 19, 2015

Cardiff-by-the-Sea, California, June 19, 2015 — NantKwest, Inc., a clinical-stage immunotherapy company focused on harnessing the power of the innate immune system by using the natural killer cell to treat cancer, infectious diseases and inflammatory diseases, today announced that it has publicly filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission (SEC) relating to a proposed initial public offering of shares of its common stock. All shares of common stock to be sold in the offering will be offered by NantKwest. The number of shares to be offered and the price range for the proposed offering have not yet been determined.

Merrill Lynch, Pierce, Fenner & Smith Incorporated, Citigroup Global Markets Inc., Jefferies LLC and Piper Jaffray & Co. are acting as joint book-running managers for the offering, and MLV & Co. LLC is acting as co-manager.

A registration statement relating to these securities has been filed with the SEC, but has not yet become effective. These securities may not be sold, nor may offers to buy be accepted, prior to the time the registration statement becomes effective. This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities 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.

The offering will be made only by means of a prospectus. When available, copies of the preliminary prospectus may be obtained from: BofA Merrill Lynch, 222 Broadway, New York, NY 10038, Attention: Prospectus Department, or by email at: dg.prospectus_requests@baml.com; Citigroup, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, by email at prospectus@citi.com or by phone at 800-831-9146; Jefferies LLC, Equity Syndicate Prospectus Department, 520 Madison Avenue, 2nd Floor, New York, NY 10022, or by telephone at (877) 547-6340 or by email at Prospectus_Department@Jefferies.com; or Piper Jaffray & Co., Attention: Prospectus Department, 800 Nicollet Mall, Suite 800, Minneapolis, MN 55402, by email to prospectus@pjc.com, or by telephone at (800) 747-3924.

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