# EDGAR Filing Document

**Accession Number:** 0001478320
**File Stem:** 0001193125-26-263844
**Filing Date:** 2026-6
**Character Count:** 6285
**Document Hash:** 19bee11c4f5af82a37d213281072efc8
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-263844.hdr.sgml**: 20260609

**ACCESSION NUMBER**: 0001193125-26-263844

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 9

**CONFORMED PERIOD OF REPORT**: 20260605

**ITEM INFORMATION**: Submission of Matters to a Vote of Security Holders

**FILED AS OF DATE**: 20260609

**DATE AS OF CHANGE**: 20260609

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Adaptive Biotechnologies Corp
- **CENTRAL INDEX KEY:** 0001478320
- **STANDARD INDUSTRIAL CLASSIFICATION:** BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836]
- **ORGANIZATION NAME:** 03 Life Sciences
- **EIN:** 270907024
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38957
- **FILM NUMBER:** 261076539

**BUSINESS ADDRESS:**
- **STREET 1:** 1165 EASTLAKE AVE E
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98109
- **BUSINESS PHONE:** 206-659-0067

**MAIL ADDRESS:**
- **STREET 1:** 1165 EASTLAKE AVE E
- **CITY:** SEATTLE
- **STATE:** WA
- **ZIP:** 98109

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Adaptive TCR Corp
- **DATE OF NAME CHANGE:** 20091209

?xml version='1.0' encoding='ASCII'? 8-K

**UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549**

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## FORM 8-K

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**CURRENT REPORT**

**Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934**

**Date of Report (Date of earliest event reported): June 9, 2026 (**June 05, 2026**)**<br>

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ADAPTIVE BIOTECHNOLOGIES CORPORATION

**(Exact name of Registrant as Specified in Its Charter)**

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| | | |
|:---|:---|:---|
| Washington | 001-38957 | 27-0907024 |
| **(State or Other Jurisdiction<br>of Incorporation)** | **(Commission File Number)** | **(IRS Employer<br>Identification No.)** |
| 1165 Eastlake Avenue East |  |  |
| Seattle**,** Washington |  | 98109 |
| **(Address of Principal Executive Offices)** |  | **(Zip Code)** |

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**Registrant's Telephone Number, Including Area Code:** (206) 659-0067<br>

Not Applicable

**(Former Name or Former Address, if Changed Since Last Report)**

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Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

**Securities registered pursuant to Section 12(b) of the Act:**

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| | | |
|:---|:---|:---|
| **<br>Title of each class** | **Trading<br>Symbol(s)** | **<br>Name of each exchange on which registered** |
| Common stock, par value $0.0001 per share | ADPT | The Nasdaq Stock Market LLC |

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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## Item 5.07 Submission of Matters to a Vote of Security Holders.
On June 5, 2026, Adaptive Biotechnologies Corporation (the "***Company***") held its annual meeting of shareholders (the "***Annual Meeting***") pursuant to notice duly given. Three proposals were presented for voting: Proposal 1: election of two Class I directors to the Board of Directors (Robert Hershberg, PhD, MD and Katey Owen, PhD); Proposal 2: an advisory request concerning compensation for the Company's 2025 named executive officers; and, Proposal 3: ratification of Ernst & Young LLP as the Company's independent registered public accounting firm for the year ending December 31, 2026. Each of the proposals was described in detail in the Company's definitive proxy statement on Schedule 14A filed with the U.S. Securities and Exchange Commission on April 24, 2026. A quorum of the shareholders voted by the conclusion of the Annual Meeting. The final results of the voting are set forth below.

**Proposal 1: Election of Two Class I Directors**

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| | | | |
|:---|:---|:---|:---|
| **Robert Hershberg PhD, MD**  | **Votes Submitted** | **As % of Proposal Votes** | **Broker Non Vote** |
| **For** | 93188652 | 71.81% | 13570859 |
| **Against** | - | - |  |
| **Withhold/Abstain** | 36573708 | 28.19% |  |

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| | | | |
|:---|:---|:---|:---|
| **Katey Owen, PhD** | **Votes Submitted** | **As % of Proposal Votes** | **Broker Non Vote** |
| **For** | 126803695 | 97.72% | 13570859<br>|
| **Against** | - | - |  |
| **Withhold/Abstain** | 2958666 | 2.28% |  |

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**Proposal 2: Advisory Vote Concerning the 2025 Compensation of the Company's Named Executive Officers** 

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| | | | |
|:---|:---|:---|:---|
|  | **Votes Submitted** | **As % of Proposal Votes** | **Broker Non Vote** |
| **For** | 125287618 | 96.55% | 13570859 |
| **Against** | 4316144 | 3.33% |  |
| **Withhold/Abstain** | 158599 | 0.12% |  |

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**Proposal 3: Ramification of Ernst & Young LLP as the Company's Independent Registered Public Accounting Firm for the Year Ending December 31, 2026**

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| | | | |
|:---|:---|:---|:---|
|  | **Votes Submitted** | **As % of Proposal Votes** | **Broker Non Vote** |
| **For** | 142609643 | 99.50% | 0 |
| **Against** | 484798 | 0.34% |  |
| **Withhold/Abstain** | 238779 | 0.17% |  |

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**SIGNATURES**

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | | |
|:---|:---|:---|:---|
|  |  |  | **Adaptive Biotechnologies Corporation** |
| Date: | June 9, 2026 | By:  | /s/ Kyle Piskel |
|  |  |  | Kyle Piskel<br>Chief Financial Officer |

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