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

This SEC Form 4 filing reports that Julie Rubinstein, President and COO of Adaptive Biotechnologies Corp (ADPT), executed a series of stock option exercises and subsequent stock sales from March 27-31, 2026. Rubinstein exercised 44,166 stock options at $7.27 per share and sold 57,602 shares at prices ranging from $12.07 to $13.87 per share. The transactions were conducted under a Rule 10b5-1 trading plan adopted on November 18, 2025, which allows pre-planned trading to avoid insider trading concerns. Following these transactions, Rubinstein's direct holdings decreased from 483,614 shares to 455,878 common shares, while her remaining stock options decreased from 140,607 to 111,163. The filing demonstrates significant insider trading activity with substantial profit realization from option exercises and subsequent sales at higher market prices.