144 0001780649 XXXXXXXX LIVE 0001478320 Adaptive Biotechnologies Corp 001-38957 1165 EASTLAKE AVE E SEATTLE WA 98109 206-659-0067 ROBINS CHAD M Officer Director Common Stock Morgan Stanley Smith Barney LLC

1 New York Plaza, 8th Floor New York WA 10004

470167 6826824.84 153981561 03/11/2026 NASDAQ Common Stock 03/10/2026 Restricted Stock Unit Issuer N 140567 03/10/2026 N/A Common Stock 03/10/2026 Performance Stock Units Issuer N 329600 03/10/2026 N/A N Chad Robins

1165 Eastlake Avenue E Seattle WA 98109

Common Stock 03/03/2026 53083 823826.47 Chad Robins

1165 Eastlake Avenue E Seattle WA 98109

Common Stock 03/02/2026 41666 653256.21 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 03/02/2026 41666 653197.88 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 03/02/2026 41666 653185.38 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 03/02/2026 47692 765752.29 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 03/02/2026 116334 1848151.72 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 02/27/2026 99225 1589941.71 Chad Robins

1165 Eastlake Avenue E Seattle WA 98109

Common Stock 02/27/2026 83666 1334138.04 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 02/02/2026 41666 762950.29 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 02/02/2026 41666 774225.11 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 02/02/2026 41666 767821.05 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 01/05/2026 41666 649206.28 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 01/05/2026 41666 641710.57 Chad Robins

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 01/05/2026 41666 658068.64 The securities to be sold were acquired upon the vesting of restricted stock units and performance stock units on 3/4/2026. 03/16/2026 /s/ Chad Robins