144 0001780662 XXXXXXXX LIVE 0001478320 Adaptive Biotechnologies Corp 001-38957 1165 EASTLAKE AVE E SEATTLE WA 98109 206-659-0067 PISKEL KYLE Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

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

18672 271117.44 153981561 03/11/2026 NASDAQ Common 03/10/2026 Restricted Stock Units Issuer N 18672 03/10/2026 N/A N Kyle Piskel

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 02/04/2026 2145 39596.70 Kyle Piskel

1165 Eastlake Avenue East Seattle WA 98109

Common Stock 01/12/2026 4290 77220.00 The securities to be sold were acquired upon the vesting of restricted stock units on 3/4/2026. 03/16/2026 /s/ Kyle Piskel