ROBINS CHAD M (CEO and Chairman) sold 21.6% of their position (600K shares) of ADAPTIVE BIOTECHNOLOGIES CORP on the open market

Open‑market sale worth $14.88M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 4 sales

ROBINS CHAD M

Filed: 8/20/2026ACC: 0001780649-26-000014

InsiderROBINS CHAD MCIK 1780649

→

IssuerADAPTIVE BIOTECHNOLOGIES CORPCIK 1478320

DirectorOfficer· CEO and Chairman

Since Jun 2019

-600K

Net shares

Net seller

$14.88M

Total sold

Open market trades

0B · 4S

Total transactions

600K acquired · 1.20M disposed

Non-Derivative Transactions6

Common Stock

Direct

M · Option Exercise

+321.32K

Price / share

$6.55

Trade value

$2.10M

% of position

14.7%

8/17/2026

2.18M→2.50M

Common Stock

Direct

S · Sale

−318.80K

Price / share

$25.08

Trade value

$8M

% of position

12.7%

8/17/2026

2.50M→2.18M

Common Stock

Direct

S · Sale

−2.52K

Price / share

$25.57

Trade value

$64.56K

% of position

0.1%

8/17/2026

2.18M→2.18M

Common Stock

Direct

M · Option Exercise

+278.68K

Price / share

$6.55

Trade value

$1.83M

% of position

12.8%

8/18/2026

2.18M→2.46M

Common Stock

Direct

S · Sale

−278.47K

Price / share

$24.48

Trade value

$6.82M

% of position

11.3%

8/18/2026

2.46M→2.18M

Common Stock

Direct

S · Sale

−204.00

Price / share

$25.14

Trade value

$5.13K

% of position

0.0%

8/18/2026

2.18M→2.18M

Total

Net shares

+0.00

Net value

-$10.95M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	8/17/2026	M · Option Exercise	+321.32K	$6.55	$2.10M	14.7%	2.18M	2.50M
Common Stock Direct	8/17/2026	S · Sale	−318.80K	$25.08	$8M	12.7%	2.50M	2.18M
Common Stock Direct	8/17/2026	S · Sale	−2.52K	$25.57	$64.56K	0.1%	2.18M	2.18M
Common Stock Direct	8/18/2026	M · Option Exercise	+278.68K	$6.55	$1.83M	12.8%	2.18M	2.46M
Common Stock Direct	8/18/2026	S · Sale	−278.47K	$24.48	$6.82M	11.3%	2.46M	2.18M
Common Stock Direct	8/18/2026	S · Sale	−204.00	$25.14	$5.13K	0.0%	2.18M	2.18M
Total			+0.00		-$10.95M

Derivative Transactions2

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

321.32K shares

−321.32K

Strike price

6.55

Held after

278.68K

Exercisable

—

8/17/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

278.68K shares

−278.68K

Strike price

6.55

Held after

0.00

Exercisable

—

8/18/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Common Stock321.32K shares	8/17/2026	M · Option Exercise	−321.32K	6.55	—	278.68K
Stock Option (right to buy) Direct	Common Stock278.68K shares	8/18/2026	M · Option Exercise	−278.68K	6.55	—	0.00