Form 4 Filing by Susan Bobulsky

Susan Bobulsky, Chief Commercial Officer, MRD of Adaptive Biotechnologies Corp, reported a disposition of 487 shares of common stock on July 1, 2026. The transaction was executed at a price of $22.00 per share, resulting in 406,288 shares remaining. This transaction was conducted under a Rule 10b5-1 trading plan adopted on December 16, 2025. The filing was made on July 6, 2026.