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

Open‑market sale worth $879.1K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 5 sales

RUBINSTEIN JULIE

Filed: 10/21/2026ACC: 0001780664-26-000043

InsiderRUBINSTEIN JULIECIK 1780664

→

IssuerADAPTIVE BIOTECHNOLOGIES CORPCIK 1478320

Officer· President

Since Jun 2019

-35.64K

Net shares

Net seller

$879.1K

Total sold

Open market trades

0B · 5S

Total transactions

35.64K acquired · 71.29K disposed

Non-Derivative Transactions8

Common Stock

Direct

M · Option Exercise

+11.88K

Price / share

$12.14

Trade value

$144.24K

% of position

3.1%

10/19/2026

377.80K→389.68K

Common Stock

Direct

S · Sale

−11.88K

Price / share

$24.05

Trade value

$285.74K

% of position

3.0%

10/19/2026

389.68K→377.80K

Common Stock

Direct

M · Option Exercise

+11.88K

Price / share

$12.14

Trade value

$144.24K

% of position

3.1%

10/20/2026

377.80K→389.68K

Common Stock

Direct

S · Sale

−11.78K

Price / share

$24.53

Trade value

$288.99K

% of position

3.0%

10/20/2026

389.68K→377.90K

Common Stock

Direct

S · Sale

−100.00

Price / share

$24.85

Trade value

$2.48K

% of position

0.0%

10/20/2026

377.90K→377.80K

Common Stock

Direct

M · Option Exercise

+11.88K

Price / share

$12.14

Trade value

$144.24K

% of position

3.1%

10/21/2026

377.80K→389.68K

Common Stock

Direct

S · Sale

−6K

Price / share

$25.25

Trade value

$151.47K

% of position

1.5%

10/21/2026

389.68K→383.68K

Common Stock

Direct

S · Sale

−5.88K

Price / share

$25.57

Trade value

$150.40K

% of position

1.5%

10/21/2026

383.68K→377.80K

Total

Net shares

+0.00

Net value

-$446.38K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	10/19/2026	M · Option Exercise	+11.88K	$12.14	$144.24K	3.1%	377.80K	389.68K
Common Stock Direct	10/19/2026	S · Sale	−11.88K	$24.05	$285.74K	3.0%	389.68K	377.80K
Common Stock Direct	10/20/2026	M · Option Exercise	+11.88K	$12.14	$144.24K	3.1%	377.80K	389.68K
Common Stock Direct	10/20/2026	S · Sale	−11.78K	$24.53	$288.99K	3.0%	389.68K	377.90K
Common Stock Direct	10/20/2026	S · Sale	−100.00	$24.85	$2.48K	0.0%	377.90K	377.80K
Common Stock Direct	10/21/2026	M · Option Exercise	+11.88K	$12.14	$144.24K	3.1%	377.80K	389.68K
Common Stock Direct	10/21/2026	S · Sale	−6K	$25.25	$151.47K	1.5%	389.68K	383.68K
Common Stock Direct	10/21/2026	S · Sale	−5.88K	$25.57	$150.40K	1.5%	383.68K	377.80K
Total			+0.00		-$446.38K

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

225.32K

Exercisable

—

10/19/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

11.88K shares

−11.88K

Strike price

12.14

Held after

213.44K

Exercisable

—

10/20/2026

Stock Option (right to buy)

Direct

M · Option Exercise

Converts to

Common Stock

11.88K shares

−11.88K

Strike price

12.14

Held after

201.56K

Exercisable

—

10/21/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option (right to buy) Direct	Common Stock11.88K shares	10/19/2026	M · Option Exercise	−11.88K	12.14	—	225.32K
Stock Option (right to buy) Direct	Common Stock11.88K shares	10/20/2026	M · Option Exercise	−11.88K	12.14	—	213.44K
Stock Option (right to buy) Direct	Common Stock11.88K shares	10/21/2026	M · Option Exercise	−11.88K	12.14	—	201.56K