144 0001780851 XXXXXXXX LIVE 0001478320 Adaptive Biotechnologies Corporation 001-38957 1165 Eastlake Avenue East Seattle WA 98109 1-206-659-0067 Harlan Robins Officer Common Stock Goldman Sachs & Co. LLC 200 West Street New York NY 10282 386240 8184425.6 160044392 07/02/2026 NASD Common Stock 03/07/2026 Acquired as compensation -- Performance Awards The Issuer N 7206 03/07/2026 Compensation Common Stock 03/07/2026 Acquired as compensation -- Performance Awards The Issuer N 6205 03/07/2026 Compensation Common Stock 03/07/2026 Acquired as compensation -- Performance Awards The Issuer N 3561 03/07/2026 Compensation Common Stock 03/07/2026 Acquired as compensation -- Performance Awards The Issuer N 22535 03/07/2026 Compensation Common Stock 03/07/2026 Acquired as compensation -- Performance Awards The Issuer N 30434 03/07/2026 Compensation Common Stock 03/07/2026 Acquired as compensation -- Performance Awards The Issuer N 18274 03/07/2026 Compensation Common Stock 03/10/2026 Acquired as compensation -- Performance Awards The Issuer N 13457 03/10/2026 Compensation Common Stock 03/06/2023 Acquired as compensation -- Restricted Stock Units The Issuer N 46021 03/06/2023 Compensation Common Stock 03/04/2021 Acquired as compensation -- Restricted Stock Units The Issuer N 17170 03/04/2021 Compensation Common Stock 03/04/2022 Acquired as compensation -- Restricted Stock Units The Issuer N 61779 03/04/2022 Compensation Common Stock 03/04/2021 Acquired as compensation -- Restricted Stock Units The Issuer N 11548 03/04/2021 Compensation Common Stock 03/04/2022 Acquired as compensation -- Restricted Stock Units The Issuer N 44235 03/04/2022 Compensation Common Stock 03/06/2023 Acquired as compensation -- Restricted Stock Units The Issuer N 55766 03/06/2023 Compensation Common Stock 03/04/2024 Acquired as compensation -- Restricted Stock Units The Issuer N 48049 03/04/2024 Compensation N Harlan Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 06/15/2026 100000 1737460 Harlan Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 06/16/2026 6160 110945.91 Harlan Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 04/08/2026 10000 148323.94 The sales of shares set forth herein are made in connection with a selling plan dated 3/13/2026, that is intended to comply with Rule 10b501(c). 07/02/2026 03/13/2026 Goldman Sachs & Co. LLC on behalf of Harlan Robins