Form 4 Filing for Susan Bobulsky

Susan Bobulsky, Chief Commercial Officer, MRD of Adaptive Biotechnologies Corp, reported a disposition of 6444 shares of Common Stock on October 6, 2026. The transaction was executed at a price of $30.00 per share, resulting in 389,350 shares remaining. This transaction was conducted under a Rule 10b5-1 trading plan established on December 16, 2025. The filing is a Form 4, indicating a change in beneficial ownership.