Company: ATRA
Filing Date: 2025-04-28
Form Type: DEF 14A
Source: 0000950170-25-059322
Chunk: 2

Company: Atara Biotherapeutics, Inc.
Filing Date: 2025-04-28
Form: DEF 14A
Chunk 2
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 Directors and Corporate Governance                              |     |   10 |
| Proposal 2: Advisory Vote on Executive Compensation                                                |     |   21 |
| Proposal 3: Advisory Vote on the Frequency of Stockholder Advisory Votes on Executive Compensation |     |   22 |
| Proposal 4: Ratification of the Selection of Independent Registered Public Accounting Firm         |     |   23 |
| Security Ownership of Certain Beneficial Owners and Management                                     |     |   24 |
| Executive Officers                                                                                 |     |   26 |
| Executive Compensation                                                                             |     |   26 |
| Transactions with Related Persons and Indemnification                                              |     |   48 |
| Householding of Proxy Materials                                                                    |     |   49 |
| Other Matters                                                                                      |     |   50 |

<div align='center'>ATARA BIOTHERAPEUTICS, INC.

1280 Rancho Conejo Boulevard, Thousand Oaks, CA 91320

PROXY STATEMENT

FOR THE 2025 ANNUAL MEETING OF STOCKHOLDERS

QUESTIONS AND ANSWERS ABOUT THESE PROXY MATERIALS AND VOTING</div>

Why did I receive a notice regarding the availability of proxy materials on the internet?

Pursuant to rules adopted by the Securities and Exchange Commission (the “SEC”), we have elected to provide access to our proxy materials over the internet. Accordingly, we have sent you a Notice of Internet Availability of Proxy Materials (the “Notice”) because our Board of Directors (the “Board”) is soliciting your proxy to vote at the 2025 Annual Meeting of Stockholders (the “Annual Meeting”), including any votes related to adjournments or postponements of the meeting. All stockholders will have the ability to access the proxy materials on the website referred to in the Notice or request to receive a printed set of the proxy materials. Instructions on how to access the proxy materials over the internet or to request a printed copy may be found in the Notice. In this Proxy Statement, “we”, “us”, “our”, “Company” and “Atara” refer to Atara Biotherapeutics, Inc.

We intend to mail the Notice on or about April 29, 2025 to all stockholders of record entitled to vote at the Annual Meeting.

How do I attend the Annual Meeting?

The meeting will be held virtually via live audio webcast on June 10, 2025 at 9:00 a.m. Pacific time. The meeting will only be conducted virtually via web