Adaptive Biotechnologies Corp — Director's Dealing 2026

Feb 6, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Adaptive Biotechnologies Corp (ADPT)
CIK: 0001478320
Period of Report: 2026-02-04

Reporting Person: PISKEL KYLE (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-04	Common Stock	M	2145	$12.14	Acquired	218782	Direct
2026-02-04	Common Stock	S	2145	$18.46	Disposed	216637	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-04	Stock Option (right to buy)	$12.14	M	2145	Disposed	2032-03-04	Common Stock (2145)	Direct

Footnotes

F1: The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 28, 2025.

F2: The options vested with respect to 1/4 of such shares on March 4, 2023, with 1/48 of such shares vesting thereafter at the end of each full month of continuous service until fully vested.