144 0001780649 XXXXXXXX LIVE 0001478320 Adaptive Biotechnologies Corporation 001-38957 1165 Eastlake Avenue East Seattle WA 98109 1-206-659-0067 Chad Robins Officer Common Stock Goldman Sachs & Co. LLC 200 West Street New York NY 10282 37263 552982.92 153981561 04/08/2026 NASD Common Stock 09/01/2009 Founder's Shares The Issuer N 37263 09/01/2009 None N Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/02/2026 41666 653647.87 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 04/06/2026 41666 603273.68 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 02/02/2026 41666 762950.29 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/02/2026 41666 660993.59 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 02/02/2026 41666 774225.11 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 02/02/2026 41666 767821.05 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 02/27/2026 99225 1589941.71 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/02/2026 41666 655964.5 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 02/27/2026 83666 1334138.04 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 04/06/2026 41666 597515.44 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/02/2026 96323 1546542.82 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/02/2026 67703 1056383.45 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/03/2026 4452 71681.21 Chad M. Robins 1165 Eastlake Avenue East Seattle WA 98109 Common Stock 03/03/2026 48631 752258.35 The sales of shares set forth herein are made in connection with a selling plan dated 8/11/2025, that is intended to comply with Rule 10b5-1(c). 04/08/2026 08/11/2025 Goldman Sachs & Co. LLC on behalf of Chad Robins