RUBINSTEIN JULIE (President) sold 8.6% of their position (35.64K shares) of ADAPTIVE BIOTECHNOLOGIES CORP on the open market

Open‑market sale worth $919.9K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 4 sales

RUBINSTEIN JULIE

Filed: 10/13/2026ACC: 0001780664-26-000039

InsiderRUBINSTEIN JULIECIK 1780664

→

IssuerADAPTIVE BIOTECHNOLOGIES CORPCIK 1478320

Officer· President

Since Jun 2019

-35.64K

Net shares

Net seller

$919.9K

Total sold

Open market trades

0B · 4S

Total transactions

35.64K acquired · 71.29K disposed

Non-Derivative Transactions7

Common Stock

Direct

M · Option Exercise

+11.88K

Price / share

$12.14

Trade value

$144.24K

% of position

3.1%

10/9/2026

377.80K→389.68K

Common Stock

Direct

S · Sale

−11.88K

Price / share

$26.41

Trade value

$313.78K

% of position

3.0%

10/9/2026

389.68K→377.80K

Common Stock

Direct

M · Option Exercise

+11.88K

Price / share

$12.14

Trade value

$144.24K

% of position

3.1%

10/12/2026

377.80K→389.68K

Common Stock

Direct

S · Sale

−9.18K

Price / share

$25.35

Trade value

$232.74K

% of position

2.4%

10/12/2026

389.68K→380.50K

Common Stock

Direct

S · Sale

−2.70K

Price / share

$26.07

Trade value

$70.39K

% of position

0.7%

10/12/2026

380.50K→377.80K

Common Stock

Direct

M · Option Exercise

+11.88K

Price / share

$12.14

Trade value

$144.24K

% of position

3.1%

10/13/2026

377.80K→389.68K

Common Stock

Direct

S · Sale

−11.88K

Price / share

$25.50

Trade value

$302.97K

% of position

3.0%

10/13/2026

389.68K→377.80K

Total

Net shares

+0.00

Net value

-$487.16K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	10/9/2026	M · Option Exercise	+11.88K	$12.14	$144.24K	3.1%	377.80K	389.68K
Common Stock Direct	10/9/2026	S · Sale	−11.88K	$26.41	$313.78K	3.0%	389.68K	377.80K
Common Stock Direct	10/12/2026	M · Option Exercise	+11.88K	$12.14	$144.24K	3.1%	377.80K	389.68K
Common Stock Direct	10/12/2026	S · Sale	−9.18K	$25.35	$232.74K	2.4%	389.68K	380.50K
Common Stock Direct	10/12/2026	S · Sale	−2.70K	$26.07	$70.39K	0.7%	380.50K	377.80K
Common Stock Direct	10/13/2026	M · Option Exercise	+11.88K	$12.14	$144.24K	3.1%	377.80K	389.68K
Common Stock Direct	10/13/2026	S · Sale	−11.88K	$25.50	$302.97K	3.0%	389.68K	377.80K
Total			+0.00		-$487.16K

Derivative Transactions3

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

11.88K shares

−11.88K

Strike price

12.14

Held after

296.61K

Exercisable

—

10/9/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

11.88K shares

−11.88K

Strike price

12.14

Held after

284.73K

Exercisable

—

10/12/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

11.88K shares

−11.88K

Strike price

12.14

Held after

272.85K

Exercisable

—

10/13/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Common Stock11.88K shares	10/9/2026	M · Option Exercise	−11.88K	12.14	—	296.61K
Stock Option (right to buy) Direct	Common Stock11.88K shares	10/12/2026	M · Option Exercise	−11.88K	12.14	—	284.73K
Stock Option (right to buy) Direct	Common Stock11.88K shares	10/13/2026	M · Option Exercise	−11.88K	12.14	—	272.85K