Company: ATRA
Filing Date: 2025-04-28
Form Type: DEF 14A
Source: 0000950170-25-059322
Chunk: 1

Company: Atara Biotherapeutics, Inc.
Filing Date: 2025-04-28
Form: DEF 14A
Chunk 1
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che LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2025; and 5. To conduct any other business properly brought before the Annual Meeting. These items of business are more fully described in the Proxy Statement accompanying this Notice. This Notice is not a form for voting and presents only an overview of the more complete proxy materials, which contain important information. You should access and review all proxy materials before voting. The Proxy Statement accompanying this Notice contains instructions on how to access our proxy materials and vote online, or in the alternative, request a paper copy of the proxy materials and a proxy card. The record date for the Annual Meeting is April 15, 2025 (the “Record Date”). Only stockholders of record at the close of business on that date may vote at the meeting or any adjournment thereof. To increase access for all our stockholders, we have determined that it is prudent to hold this year’s Annual Meeting in a virtual-only format via live audio webcast. You may attend the virtual Annual Meeting at www.virtualshareholdermeeting.com/ATRA2025. To participate in the Annual Meeting, you will need the 16-digit control number that appears on your Notice of Internet Availability of Proxy Materials, proxy card or the instructions that accompanied your proxy materials. Refer to the “Questions and Answers About These Proxy Materials and Voting” section of the accompanying Proxy Statement for detailed procedures regarding attending, submitting questions and voting at the virtual Annual Meeting. A list of stockholders entitled to vote at the meeting will be available for examination during normal business hours for ten days prior to the meeting for any purpose germane to the meeting at our corporate headquarters at 1280 Rancho Conejo Boulevard, Thousand Oaks, CA 91320. The stockholder list will also be available during the meeting at www.virtualshareholdermeeting.com/ATRA2025.

| By Order of the Board of Directors    |
| /s/ AnhCo Nguyen                      |
| AnhCo Nguyen PhD                      |
| President and Chief Executive Officer |

Thousand Oaks, California April 28, 2025

TABLE OF CONTENTS

|                                                                                                    |     | Page |
| Questions and Answers About These Proxy Materials and Voting                                       |     |    1 |
| Proposal 1: Election of Directors                                                                  |     |    7 |
| Nominees for Election for a Three-Year Term Expiring at the 2028 Annual Meeting                    |     |    7 |
| Information Regarding the Board of