Julie Rubinstein's Stock Option Exercises and Sales at Adaptive Biotechnologies

This Form 4 filing reports stock transactions by Julie Rubinstein, President and COO of Adaptive Biotechnologies Corp (ADPT), from April 9-13, 2026. Rubinstein exercised stock options to acquire 44,166 shares at exercise prices of $7.27 and $8.46 per share, while simultaneously selling 57,180 shares at prices ranging from $12.75 to $14.44 per share. The net effect was a reduction in her direct holdings from 448,910 to 421,174 shares. All transactions were executed pursuant to a Rule 10b5-1 trading plan adopted on November 18, 2025, indicating pre-planned trading activity. The sales were conducted at weighted average prices with detailed price ranges provided in footnotes. Rubinstein also exercised options with expiration dates in 2029 and 2033, with some options being fully vested and others following a monthly vesting schedule.