X0306 4 2022-03-04 0 0001478320 Adaptive Biotechnologies Corp ADPT 0001780649 ROBINS CHAD M C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION 1165 EASTLAKE AVENUE E SEATTLE WA 98109 1 1 0 0 CEO and Chairman Common Stock 2022-03-04 4 A 0 247117 0.00 A 1920578 D Common Stock 2022-03-07 4 S 0 4424 12.01 D 1916154 D This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person. /s/ Chad Robins by Eric Billings, attorney-in-fact 2022-03-08