Company: ADPT
Filing Date: 2025-04-29
Form Type: DEF 14A
Source: 0001193125-25-103752
Chunk: 75

Company: Adaptive Biotechnologies Corp
Filing Date: 2025-04-29
Form: DEF 14A
Chunk 75
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 box if you wish to vote in accordance with the Board of Directors’ recommendation. The Named Proxies cannot vote your shares unless you sign (on the reverse side) and return this card. PLEASE BE SURE TO SIGN AND DATE THIS PROXY CARD AND MARK ON THE REVERSE SIDE Copyright © 2025 BetaNXT, Inc. or its affiliates. All Rights Reserved

| Adaptive Biotechnologies Corporation Annual Meeting of Shareholders |

| Please make your marks like this: |

THE BOARD OF DIRECTORS RECOMMENDS A VOTE: FORON PROPOSALS 1, 2 AND 3

|    |     | PROPOSAL                                                                                                                                                                                      |     |     |     | YOUR VOTE |     |         |     | BOARD OF DIRECTORS RECOMMENDS |
| 1. |     | To elect one Class III director nominee to serve on the board of directors of Adaptive Biotechnologies Corporation for a three-year term expiring at the 2028 annual meeting of shareholders; |     | FOR |     | WITHHOLD  |     |         |     |                               |
|    |     | 1.01 Chad Robins                                                                                                                                                                              |     | ☐   |     | ☐         |     |         |     | FOR                           |
|    |     |                                                                                                                                                                                               |     | FOR |     | AGAINST   |     | ABSTAIN |     |                               |
| 2. |     | To approve, on a non-binding advisory basis, the compensation of our named executive officers as described in the proxy statement;                                                            |     | ☐   |     | ☐         |     | ☐       |     | FOR                           |
| 3. |     | To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the year ending December 31, 2025; and                                                |     | ☐   |     | ☐         |     | ☐       |     | FOR                           |
| 4. |     | To conduct any other business properly brought before the meeting or any adjournments thereof                                                                                                 |     |     |     |           |     |         |     |                               |

You must register to attend the meeting by Friday, June 6, 2025 at 5:00 pm PT at www.proxydocs.com/ADPT Authorized Signatures - Must be completed for your instructions to be executed. Please sign exactly as your name(s) appears on your account. If held in joint ten