Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On October 9, 2020, Dr. Andris Zoltners notified the chairman of the board of directors (the "Board") of Adaptive Biotechnologies Corporation (the "Company"), of his intent to resign as a director of the Board. Dr. Zoltners resigned effective October 14, 2020. Dr. Zoltners stated that he does not have any disagreement with the Company, its management, the Board or any committee of the Board on any matter.

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