Chad M. Robins - 11 Mar 2026 Form 4 Insider Report for Adaptive Biotechnologies Corp (ADPT)

Role: CEO and Chairman, Director
Signature: /s/ Chad M Robins by Kyle Piskel, Attorney-in-Fact
Issuer symbol: ADPT
Transactions as of: 11 Mar 2026
Net transactions value: -$6,192,099
Form type: 4
Filing time: 13 Mar 2026, 20:45:28 UTC
Previous filing: 06 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
ROBINS CHAD M	CEO and Chairman, Director	C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION, 1165 EASTLAKE AVENUE EAST, SEATTLE	/s/ Chad M Robins by Kyle Piskel, Attorney-in-Fact	13 Mar 2026	0001780649

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ADPT	Common Stock	Sale	$1,851,267	-140,567	-5.1%	$13.17	2,630,713	11 Mar 2026	Direct	F1
transaction	ADPT	Common Stock	Sale	$4,340,832	-329,600	-13%	$13.17	2,301,113	11 Mar 2026	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.
F2	This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of performance share units. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.

Content

This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.

This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of performance share units. This sale is mandated by the Issuer's election under its equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.