On December 7, 2020 Atara Biotherapeutics, Inc. (Nasdaq: ATRA), a pioneer in T-cell immunotherapy leveraging its novel allogeneic EBV T-cell platform to develop transformative therapies for patients with serious diseases including solid tumors, hematologic cancers and autoimmune diseases, reported that it has commenced an underwritten public offering of $150,000,000 of shares of its common stock (Press release, Atara Biotherapeutics, DEC 7, 2020, View Source [SID1234574478]). In connection with the proposed offering, Atara Biotherapeutics expects to grant the underwriters a 30-day option to purchase up to an additional $22,500,000 of shares of its common stock at the public offering price, less the underwriting discounts and commissions. All of the shares in the proposed offering will be sold by Atara Biotherapeutics. The proposed offering is subject to market and other conditions, and there can be no assurances as to whether or when the proposed offering may be completed, or as to the actual size or terms of the proposed offering.

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Citigroup, Evercore ISI and Mizuho Securities are acting as joint book-running managers for the proposed offering.

The securities described above are being offered by Atara Biotherapeutics pursuant to a shelf registration statement on Form S-3, including a base prospectus, that was previously filed by Atara Biotherapeutics with the Securities and Exchange Commission (the "SEC") and that became automatically effective on February 27, 2018. A preliminary prospectus supplement and accompanying prospectus relating to the proposed offering will be filed with the SEC and will be available on the SEC’s website located at View Source Copies of the preliminary prospectus supplement and the accompanying prospectus relating to the proposed offering, when available, may be obtained from: Citigroup, by mail at Citigroup Global Markets Inc., c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, or by telephone at 800-831-9146; Evercore Group L.L.C., Attention: Equity Capital Markets, 55 East 52nd Street, 35th Floor, New York, NY 10055, or by telephone at 888-474-0200, or by email at [email protected]; or Mizuho Securities USA LLC, Attention: Equity Capital Markets, 1271 Avenue of the Americas, 3rd Floor, New York, NY 10020, by telephone 212-205-7600, or by email: [email protected]. The final terms of the proposed offering will be disclosed in a final prospectus supplement to be filed with the SEC.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction.