Shattuck Labs STTK Insider Ownership

NASDAQ STTK

$5.84 +0.47 (+8.75%)

At close: Oct 20, 2026 · 4:00 PM EDT

Insider Holdings by Owner

14.79Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

8.19%

▲+0.0094% pp QoQ

Shares Held by Insiders

10.63Mn

filed for Sep 2026

▲+0.11% QoQ

Shares Outstanding

129.78Mn

129,779,297 shares

Direct Holdings

1.43Mn

Indirect: 9.20Mn

Net Shares Traded (QoQ)

+12.15K

net buying 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 10, 2026

In the last 12 months, insiders at Shattuck Labs made open-market purchases of $250,000 (62.5K shares) and open-market sales of $591,850 (85.91K shares).

Behind Shattuck Labs' open-market trades in the past 12 months were one insider buying and 2 insiders selling.
Among STTK's insiders, Clay B. Siegall (Director) was the top open-market buyer in the past 12 months, with $250,000 of stock purchased (62.5K shares) and the latest purchase on June 9, 2026.
On the selling side, Arundathy N. Pandite (Chief Medical Officer) was the top open-market seller of Shattuck Labs over the past 12 months, with $408,600 sold (60K shares) and the latest sale on June 30, 2026.
The latest open-market trade on record is a sale of 410 shares for $2,874 by Abhinav A. Shukla (Chief Technical Officer) on July 2, 2026.
Beyond open-market trades, insiders at Shattuck Labs received 235.62K shares in stock awards, acquired 38.06K shares through option exercises and conversions and gave up 32.99K shares to cover taxes or exercise prices in the last 12 months.
Business Quant data shows Shattuck Labs insiders holding 10.63Mn shares in total in their latest Form 4 filings, up 0.11% from 10.62Mn shares at the end of Q2 2026 and up 2.09% from 10.41Mn shares at the end of Q3 2025.
By type of ownership, STTK insiders hold 13.43% of their shares directly (1.43Mn shares) and 86.57% indirectly (9.2Mn shares).
Per Business Quant, 11 insiders of STTK hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
Shattuck Labs' three largest insider shareholders, based on their latest Form 4 filings, are Redmile Group, LLC (Director and 10% owner, 5.54Mn shares), Taylor Schreiber (Chief Executive Officer, 2.73Mn shares) and Orbimed Advisors LLC (Director, 1.05Mn shares).
Redmile Group, LLC alone accounts for 52.12% of the shares held by Shattuck Labs insiders.
Institutional investors held 64.55% of Shattuck Labs stock at the end of Q2 2026, while the latest Form 4 filings of its insiders account for about 8.19%; other investors, including the public, hold roughly 27.26%.
Over the trailing 12 months, 13 insiders reported transactions in STTK stock across 32 Form 4 filings.
This summary of Shattuck Labs insider activity covers Form 4 filings through July 7, 2026.

Form 4 Holdings

Insiders Holding STTK

Insiders 13

Shares held 14.79Mn

Of outstanding 11.39%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Group, Llc Redmile	Director, TenPercentOwner	0	11,155,213	11,155,213	75.4%	06 Dec, 2024
2	Advisors Llc Orbimed	Director	0	1,051,021	1,051,021	7.1%	02 Sep, 2025
3	Mona Ashiya	Director	0	1,051,021	1,051,021	7.1%	02 Sep, 2025
4	Clay B Siegall	Director	318,608	0	318,608	2.2%	11 Jun, 2026
5	Andrew R Neill	Chief Financial Officer	292,251	0	292,251	2.0%	14 May, 2026
6	Tyler Brous	Director	238,088	0	238,088	1.6%	01 Jul, 2024
7	Arundathy N. Pandite	Chief Medical Officer	136,219	0	136,219	0.9%	02 Jul, 2026
8	Taylor Schreiber	Chief Executive Officer	122,222	0	122,222	0.8%	13 May, 2026
9	Erin Ator Thomson	General Counsel	103,209	0	103,209	0.7%	27 Jan, 2023
10	Abhinav A. Shukla	Chief Technical Officer	98,533	0	98,533	0.7%	07 Jul, 2026
11	Stephen Stout	Officer	93,366	0	93,366	0.6%	18 May, 2026
12	Casi Deyoung	Chief Business Officer	73,480	0	73,480	0.5%	27 Jan, 2026
13	George Golumbeski	Director	54,613	0	54,613	0.4%	27 Apr, 2022

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

360 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
02 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Acquired M	410	$3.57	$1.46K	86,790	Direct
02 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed S	410	$7.01	$2.87K	86,380	Direct
06 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Acquired M	12,153	$3.57	$43.39K	98,533	Direct
02 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed M	410	$0.00	$0	26,293	Direct
06 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed M	12,153	$0.00	$0	14,140	Direct
30 Jun, 2026	Abhinav A. Shukla	Chief Technical Officer	Acquired M	23,365	$3.57	$83.41K	109,745	Direct
30 Jun, 2026	Arundathy N. Pandite	Chief Medical Officer	Disposed S	30,000	$7.01	$210.30K	136,219	Direct
30 Jun, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed S	23,365	$7.08	$165.42K	86,380	Direct
01 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Acquired M	100	$3.57	$357	86,480	Direct
01 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed S	100	$7.07	$707	86,380	Direct
30 Jun, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed M	23,365	$0.00	$0	26,803	Direct
01 Jul, 2026	Abhinav A. Shukla	Chief Technical Officer	Disposed M	100	$0.00	$0	26,703	Direct
11 Jun, 2026	Mona Ashiya	Director	Acquired P	1,041,667	—	—	26,519,541	Indirect
11 Jun, 2026	Advisors Llc Orbimed	Director	Acquired P	1,041,667	—	—	26,519,541	Indirect
11 Jun, 2026	Advisors Llc Orbimed	Director	Acquired P	208,333	—	—	5,303,908	Indirect
11 Jun, 2026	Mona Ashiya	Director	Acquired P	208,333	—	—	5,303,908	Indirect
09 Jun, 2026	Clay B Siegall	Director	Acquired P	62,500	$4.00	$250.00K	318,608	Direct
08 Jun, 2026	Advisors Llc Orbimed	Director	Acquired C	15,366,490	—	—	25,477,874	Indirect
08 Jun, 2026	Mona Ashiya	Director	Acquired C	15,366,490	—	—	25,477,874	Indirect
08 Jun, 2026	Advisors Llc Orbimed	Director	Acquired C	3,073,298	—	—	5,095,575	Indirect

Showing 1 to 20 of 360 transactions