Company: ATRA
Filing Date: 2025-04-28
Form Type: DEFA14A
Source: 0000950170-25-059333
Chunk: 1

Company: Atara Biotherapeutics, Inc.
Filing Date: 2025-04-28
Form: DEFA14A
Chunk 1
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1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy. For complete information and to vote, visitwww.ProxyVote.comControl 

# Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* June 10, 2025 9:00 AM Pacific Time Virtually at:www.virtualshareholdermeeting.com/ATRA2025*Please check the meeting materials for any special requirements for meeting attendance.
Vote atwww.ProxyVote.comTHIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters. Voting Items Board Recommends 1. Election of Directors Nominees: 1a. AnhCo Nguyen, Ph.D. 1b. Matthew K. Fust 1c. Gregory A. Ciongoli 2. To approve, on an advisory basis, the compensation of the Company’s named executive officers, as disclosed in the Proxy Statement. 3. To approve, on an advisory basis, the frequency of future advisory votes on the compensation of the Company’s named executive officers. 4. To ratify the selection of Deloitte & Touche LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2025. NOTE: Such other matters that may properly come before the meeting or any adjournment or postponement thereof will be voted on by the proxy holders in their discretion. For For For For 1 Year For Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. V68539-P31357