$ADPT

$26.27 +$0.76 (2.98%) Close

$ADPT Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 159.6M shares outstanding

Who owns ADPT?

By type of holder

Institutions 97.0% Insiders 3.0% Everyone else 0.0%

Concentration Top 10 holders own 53.3%

Viking Global Investors LP 18.8% · BlackRock, Inc. 9.5%

Institutional ownership

97.0%

+2.0 pts vs last qtr

Institutional holders

296

0 vs last qtr

Net shares bought

+3.2M

by institutions in Q2 2026

New / sold out

47 / 47

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

D. E. Shaw & Co., Inc. +2.7M
Wellington Management Group LLP +2.1M

Biggest sellers in Q2 2026

Ameriprise Financial Inc −1.9M
Principal Financial Group Inc −1.7M

Who is planning to sell?

Notices of proposed sale, last 12 months

$171M

72 notices from 18 people

Shares covered

8.8M

5.51% of the company

Arranged in advance

61%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Harlan Robins Former officer $53M
Chad Robins Officer $33.7M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2020–FY2025

+15.6%

+2.95% a year

Each share's claim on the business

−13.5%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

— vs $291M

over 6 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years60% 3–5 years2% 1–3 years19% Under 1 year19%

Quarterly turnover

14.5%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting ADPT on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
VG Viking Global Investors LP	30.0M	18.79%	Unchanged	≤2021	1.8%
Shares held by quarter Peak holding30.0M (Q3'24) Change over 8 quarters0 Share of the company18.790% Viking Global Investors LP's full portfolio →
B BlackRock, Inc.	15.1M	9.49%	+1.8M (+13.8%)	≤2021	0.0%
Shares held by quarter Peak holding15.1M (Q2'26) Change over 8 quarters+3.2M Share of the company9.490% BlackRock, Inc.'s full portfolio →

Viking Global Investors LP

30.0M

% of company

18.79%

Change vs last qtr

Unchanged

Held since

≤2021

BlackRock, Inc.

15.1M

% of company

9.49%

Change vs last qtr

+1.8M (+13.8%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Adaptive Biotechnologies Corporation, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting ADPT on Form N-PORT; together they hold 36.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$104M	4.8M	3.03%	0.00%	June 30, 2026
IR iShares Russell 2000 ETF iShares Trust	$84.8M	4.0M	2.48%	0.10%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$104M

% of company

3.03%

% of the fund

0.00%

As of

June 30, 2026

iShares Russell 2000 ETF

iShares Trust

Position value

$84.8M

% of company

2.48%

% of the fund

0.10%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Adaptive Biotechnologies Corporation and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
RC Robins Chad M Insider	6.5M	4.05%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company4.050% Robins Chad M's insider activity →
RH Robins Harlan S Insider	1.6M	1.01%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company1.010% Robins Harlan S's insider activity →

Robins Chad M

Insider

6.5M

% of company

4.05%

Change vs last qtr

—

Held since

—

Robins Harlan S

Insider

1.6M

% of company

1.01%

Change vs last qtr

—

Held since

—

10 more holders behind a free account

See every insider and 5%+ holder of Adaptive Biotechnologies Corporation.

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