X0508 4 2026-03-04 0001478320 Adaptive Biotechnologies Corp ADPT 0001780851 ROBINS HARLAN S C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION 1165 EASTLAKE AVENUE EAST SEATTLE WA 98109 0 1 0 0 Chief Scientific Officer 0 Common Stock 2026-03-04 4 A 0 127813 0 A 1283104 D Common Stock 2026-03-06 4 A 0 709220 0 A 1992324 D Each performance share unit represents a contingent right to receive one share of the issuer's common stock. The performance share units were granted on March 6, 2023, with respect to the three-year period ending on March 6, 2026. The issuer certified the achievement of the performance goals on March 6, 2026. The performance share units vested on March 6, 2026. /s/ Harlan S Robins by Kyle Piskel, Attorney-in-Fact 2026-03-06