Adaptive Biotechnologies ADPT Insider Ownership

NASDAQ ADPT

$23.95 -0.07 (-0.29%)

At close: Oct 19, 2026 · 4:00 PM EDT

Insider Holdings by Owner

5.91Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

3.00%

▼-0.577% pp QoQ

Shares Held by Insiders

4.79Mn

filed for Sep 2026

▼-16.13% QoQ

Shares Outstanding

159.86Mn

159,855,257 shares

Direct Holdings

4.79Mn

Indirect: 0

Net Shares Traded (QoQ)

-921.76K

net selling in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 9, 2026

Over the past 12 months, Adaptive Biotechnologies insiders sold $120.51 million of stock on the open market (6.59Mn shares) and made no open-market purchases.

Behind Adaptive Biotechnologies' open-market sales in the past 12 months were 11 insiders, and no insider bought.
The largest open-market sales of ADPT in the past 12 months were by Chad M. Robins (CEO and Chairman), totaling $39.8 million (2.22Mn shares), most recently on August 18, 2026.
The latest open-market trade in ADPT stock by an insider was a sale of 11.88K shares for $304,866 by Julie Rubinstein (President and COO) on October 8, 2026.
In transactions other than open-market trades, Adaptive Biotechnologies insiders received 1.2Mn shares in stock awards, acquired 3.02Mn shares through option exercises and conversions and gave away 12.54K shares as gifts over the past 12 months.
According to Business Quant data, insiders at Adaptive Biotechnologies reported 4.79Mn shares in total in their latest Form 4 filings, or 2.99% of the 159.86Mn shares outstanding; that total is down 16.24% from 5.72Mn shares at the end of Q2 2026 and down 34.35% from 7.29Mn shares at the end of Q3 2025.
ADPT's insiders hold all 4.79Mn shares directly, in their own names, with no indirect holdings.
ADPT's insider total is spread across 12 insiders who have filed a Form 4 in the past two years.
ADPT's three largest insider shareholders, per their latest Form 4 filings, are Chad M. Robins (CEO and Chairman, 2.18Mn shares), Harlan S. Robins (Chief Scientific Officer, 812.06K shares) and Susan Bobulsky (Chief Commercial Officer, MRD, 389.35K shares).
Of the shares held by ADPT insiders, 45.55% belong to Chad M. Robins.
In the past year, 11 insiders of Adaptive Biotechnologies submitted 85 Form 4 filings reporting trades, awards or other transactions.
This summary of Adaptive Biotechnologies insider activity covers Form 4 filings through October 8, 2026.

Form 4 Holdings

Insiders Holding ADPT

Insiders 19

Shares held 5.91Mn

Of outstanding 3.70%

#	Insider	Position	Direct	Total	Share of Insiders	Last Filed
1	Chad M Robins	Ceo And Chairman	2,180,518	2,180,518	36.9%	19 Aug, 2026
2	Harlan S Robins	Chief Scientific Officer	812,058	812,058	13.7%	23 Jul, 2026
3	Tycho Peterson	Chief Financial Officer	531,553	531,553	9.0%	06 Mar, 2024
4	Susan Bobulsky	Chief Commercial Officer, Mrd	389,350	389,350	6.6%	08 Oct, 2026
5	Julie Rubinstein	President And Coo	377,802	377,802	6.4%	13 Oct, 2026
6	Kyle Piskel	Chief Financial Officer	256,725	256,725	4.3%	20 May, 2026
7	Sharon Benzeno	Chief Commercial Ofc Imm Med	221,278	221,278	3.7%	30 Jun, 2026
8	Francis Lo	Chief People Officer	220,867	220,867	3.7%	05 Oct, 2026
9	Nitin Sood	Chief Commercial Officer, Mrd	214,808	214,808	3.6%	08 Aug, 2023
10	R Mark Adams	Chief Operating Officer	175,361	175,361	3.0%	12 Apr, 2023
11	Stacy L Taylor	Svp And General Counsel	139,365	139,365	2.4%	23 Aug, 2024
12	Peter M Neupert	Director	130,625	130,625	2.2%	19 Aug, 2026
13	Michael J Pellini	Director	69,690	69,690	1.2%	06 Mar, 2025
14	Katey Einterz Owen	Director	66,100	66,100	1.1%	02 Sep, 2026
15	Robert Hershberg	Director	46,683	46,683	0.8%	20 Aug, 2026
16	Leslie Trigg	Director	25,907	25,907	0.4%	08 Mar, 2023
17	Kevin T Conroy	Director	22,968	22,968	0.4%	08 Mar, 2023
18	Lance Baldo	Chief Medical Officer	17,171	17,171	0.3%	10 Mar, 2022
19	Michelle Renee Griffin	Director	15,625	15,625	0.3%	29 Jun, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

2,295 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
09 Oct, 2026	Julie Rubinstein	President And Coo	Acquired M	11,881	$12.14	$144.24K	389,683	Direct
09 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	11,881	$26.41	$313.78K	377,802	Direct
12 Oct, 2026	Julie Rubinstein	President And Coo	Acquired M	11,881	$12.14	$144.24K	389,683	Direct
12 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	9,181	$25.35	$232.74K	380,502	Direct
12 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	2,700	$26.07	$70.39K	377,802	Direct
13 Oct, 2026	Julie Rubinstein	President And Coo	Acquired M	11,881	$12.14	$144.24K	389,683	Direct
13 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	11,881	$25.50	$302.97K	377,802	Direct
09 Oct, 2026	Julie Rubinstein	President And Coo	Disposed M	11,881	$0.00	$0	296,610	Direct
12 Oct, 2026	Julie Rubinstein	President And Coo	Disposed M	11,881	$0.00	$0	284,729	Direct
13 Oct, 2026	Julie Rubinstein	President And Coo	Disposed M	11,881	$0.00	$0	272,848	Direct
06 Oct, 2026	Susan Bobulsky	Chief Commercial Officer, Mrd	Disposed S	6,444	$30.00	$193.32K	389,350	Direct
06 Oct, 2026	Julie Rubinstein	President And Coo	Acquired M	11,881	$12.14	$144.24K	389,683	Direct
06 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	9,381	$27.36	$256.66K	380,302	Direct
06 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	1,100	$28.21	$31.03K	379,202	Direct
06 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	901	$29.71	$26.77K	378,301	Direct
06 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	499	$30.53	$15.23K	377,802	Direct
07 Oct, 2026	Julie Rubinstein	President And Coo	Acquired M	11,881	$12.14	$144.24K	389,683	Direct
07 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	11,881	$26.40	$313.66K	377,802	Direct
08 Oct, 2026	Julie Rubinstein	President And Coo	Acquired M	11,881	$12.14	$144.24K	389,683	Direct
08 Oct, 2026	Julie Rubinstein	President And Coo	Disposed S	11,881	$25.66	$304.87K	377,802	Direct

Showing 1 to 20 of 2,295 transactions