RUBINSTEIN JULIE (President) sold 12.3% of their position (57.18K shares) of ADAPTIVE BIOTECHNOLOGIES CORP on the open market

Open‑market sale worth $826.3K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 3 sales

RUBINSTEIN JULIE

Filed: 4/16/2026ACC: 0001780664-26-000026

InsiderRUBINSTEIN JULIECIK 1780664

→

IssuerADAPTIVE BIOTECHNOLOGIES CORPCIK 1478320

Officer· President

Since Jun 2019

-57.18K

Net shares

Net seller

$826.3K

Total sold

Open market trades

0B · 3S

Total transactions

44.17K acquired · 101.35K disposed

Non-Derivative Transactions6

Common Stock

Direct

M · Option Exercise

+14.72K

Price / share

$8.46

Trade value

$124.55K

% of position

3.5%

4/14/2026

421.17K→435.90K

Common Stock

Direct

S · Sale

−19.06K

Price / share

$14.56

Trade value

$277.51K

% of position

4.4%

4/14/2026

435.90K→416.84K

Common Stock

Direct

M · Option Exercise

+14.72K

Price / share

$8.46

Trade value

$124.55K

% of position

3.5%

4/15/2026

416.84K→431.56K

Common Stock

Direct

S · Sale

−19.06K

Price / share

$14.61

Trade value

$278.47K

% of position

4.4%

4/15/2026

431.56K→412.50K

Common Stock

Direct

M · Option Exercise

+14.72K

Price / share

$8.46

Trade value

$124.55K

% of position

3.6%

4/16/2026

412.50K→427.22K

Common Stock

Direct

S · Sale

−19.06K

Price / share

$14.18

Trade value

$270.27K

% of position

4.5%

4/16/2026

427.22K→408.16K

Total

Net shares

−13.01K

Net value

-$452.61K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	4/14/2026	M · Option Exercise	+14.72K	$8.46	$124.55K	3.5%	421.17K	435.90K
Common Stock Direct	4/14/2026	S · Sale	−19.06K	$14.56	$277.51K	4.4%	435.90K	416.84K
Common Stock Direct	4/15/2026	M · Option Exercise	+14.72K	$8.46	$124.55K	3.5%	416.84K	431.56K
Common Stock Direct	4/15/2026	S · Sale	−19.06K	$14.61	$278.47K	4.4%	431.56K	412.50K
Common Stock Direct	4/16/2026	M · Option Exercise	+14.72K	$8.46	$124.55K	3.6%	412.50K	427.22K
Common Stock Direct	4/16/2026	S · Sale	−19.06K	$14.18	$270.27K	4.5%	427.22K	408.16K
Total			−13.01K		-$452.61K

Derivative Transactions3

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

14.72K shares

−14.72K

Strike price

8.46

Held after

178.21K

Exercisable

—

4/14/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

14.72K shares

−14.72K

Strike price

8.46

Held after

163.49K

Exercisable

—

4/15/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

14.72K shares

−14.72K

Strike price

8.46

Held after

148.77K

Exercisable

—

4/16/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Common Stock14.72K shares	4/14/2026	M · Option Exercise	−14.72K	8.46	—	178.21K
Stock Option (right to buy) Direct	Common Stock14.72K shares	4/15/2026	M · Option Exercise	−14.72K	8.46	—	163.49K
Stock Option (right to buy) Direct	Common Stock14.72K shares	4/16/2026	M · Option Exercise	−14.72K	8.46	—	148.77K