Director Michelle Renee Griffin's Stock Option Exercise and Sale at Adaptive Biotechnologies

This Form 4 filing reports that Michelle Renee Griffin, a director of Adaptive Biotechnologies Corp (ADPT), executed a complex transaction involving stock options and common stock. On June 25, 2026, Griffin exercised 52,084 stock options with an exercise price of $7.80 per share, receiving the same number of common shares. Immediately following the exercise, she sold all 52,084 shares at a weighted-average price of $20.18 per share, with the actual sale prices ranging from $20.00 to $20.55. The transactions were executed pursuant to a Rule 10b5-1 trading plan adopted on November 7, 2025, indicating pre-planned trading activity. Following these transactions, Griffin's direct holdings in Adaptive Biotechnologies common stock decreased from 67,709 shares to 15,625 shares. The stock options were fully vested and exercisable, with an expiration date of April 23, 2029.