SCHEDULE 14A INFORMATION

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Atara Biotherapeutics, Inc.

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Stockholder Meeting to Be Held on June 8, 2017. ATARA BIOTHERAPEUTICS, INC. ATARA BIOTHERAPEUTICS, INC. 611 GATEWAY BLVD., SUITE 900 SOUTH SAN FRANCISCO, CA 94080 You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to  you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side).We encourage you to access and review all of the important information contained in the proxy materials before voting. See the reverse side of this notice to obtain proxy materials and voting instructions. E27920-P91733 Meeting Information Meeting Type: Annual Meeting For holders as of: April 12, 2017 Date: June 8, 2017 Time: 9:00 AM PDT Location: 611 Gateway Blvd. Suite 900 S. San Francisco, CA 94080

 

 


 

 

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE AND PROXY STATEMENT ANNUAL REPORT How to View Online: Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX  (located on  the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request: 1) BY INTERNET: www.proxyvote.com 2) BY TELEPHONE:   1-800-579-1639 3) BY E-MAIL*: sendmaterial@proxyvote.com *  If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 25, 2017 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Vote In Person: Many stockholder meetings have attendance requirements including, but not limited to, the possession of an attendance ticket issued by the entity holding the meeting. Please check the meeting materials for any special requirements for meeting attendance. At the meeting, you will need to request a ballot to vote these shares. Vote By Internet: To vote now by Internet, go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. Vote By Mail:  You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. Methods E27921-P91733

 


 

 

Voting Items The Board of Directors recommends you vote FOR the following: 1. Election of Directors Nominees: 1) Isaac E. Ciechanover, M.D. 2) Carol Gallagher, Pharm.D. The Board of Directors recommends you vote FOR the following proposal: 2. Ratification of the selection of Deloitte & Touche, LLP as the Company's independent registered public accounting firm for the fiscal year ending December 31, 2017. NOTE E27922-P91733