Company: ADPT
Filing Date: 2025-04-29
Form Type: DEF 14A
Source: 0001193125-25-103752
Chunk: 6

Company: Adaptive Biotechnologies Corp
Filing Date: 2025-04-29
Form: DEF 14A
Chunk 6
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el and Clarice McCauley discretionary authority to vote your shares in accordance with their best judgment with respect to all additional matters that might come before the Annual Meeting. If you receive more than one proxy card or Notice of Internet Availability of Proxy Materials, it means you hold shares that are registered in more than one account. To ensure that all of your shares are voted, sign and return each proxy card or, if you submit a proxy by telephone or the Internet, submit one proxy for each proxy card or Notice of Internet Availability of Proxy Materials you receive. 2

Revocation of Proxy If you are a shareholder of record, you may revoke your proxy at any time before your proxy is voted at the Annual Meeting by taking any of the following actions:

| • |     | delivering to our Corporate Secretary a signed written notice of revocation, bearing a date later than the date of the proxy, stating that the proxy is revoked; |

| • |     | signing and delivering a new paper proxy relating to the same shares and bearing a later date than the original proxy; |

| • |     | submitting another proxy by telephone or over the Internet (your latest telephone or Internet voting instructions will be followed); or |

| • |     | attending the Annual Meeting online and voting via the Internet, although attendance at the Annual Meeting will not, by itself, revoke a proxy. |

**Written notices of revocation and other communications with respect to the revocation of Company proxies should be addressed to: Adaptive Biotechnologies Corporation 1165 Eastlake Avenue East Seattle, WA 98109 Attention: General Counsel and Corporate Secretary If your shares are held in “street name,” you may change your vote by submitting new voting instructions to your broker, bank or other nominee. You must contact your broker, bank or other nominee to find out how to do so. See below regarding how to vote live if your shares are held in street name. Attendance at the Annual Meeting We are excited to once again hold a virtual-only meeting. Based on our experience in prior years, this format provides broad shareholder access to our meeting, allowing all shareholders with Internet connectivity to have a consistent experience regardless of location, ability to travel or similar factors, while saving us and our shareholders time and travel expenses, and, importantly, reducing our environmental impact. We have paid special attention to the meeting platform features, which provide shareholders the opportunity to vote, ask questions and otherwise participate in the meeting in a manner similar to—and in some ways superior to— traditional in-personshareholder meetings,