Adicet Bio ACET Insider Ownership

NASDAQ ACET

$4.39 -0.09 (-2.12%)

As of: Oct 22, 2026 · 11:11 AM EDT

Insider Holdings by Owner

970.75K Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

10.24%

▼-0.512% pp QoQ

Shares Held by Insiders

1.10Mn

filed for Sep 2026

▼-4.76% QoQ

Shares Outstanding

10.75Mn

10,745,553 shares

Direct Holdings

29.55K

Indirect: 1.07Mn

Net Shares Traded (QoQ)

-55.02K

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 11, 2026

Over the past year, ACET insiders bought $1.6 million of stock and sold $674,847 on the open market.

Among Adicet Bio insiders, Ra Capital Management, L.P. (10% owner) led open-market buying over the past 12 months with $1.6 million of purchases; the latest was on February 20, 2026.
Conversely, Orbimed Advisors LLC (10% owner) was ACET's largest open-market seller in the past 12 months, with $674,847 of sales; the latest was on April 8, 2026.
Per Business Quant data, Adicet Bio insiders hold 1.1Mn shares in total based on their latest Form 4 filings, down 4.76% from 1.16Mn shares at the end of Q2 2026.
Of the 1.1Mn shares held by Adicet Bio insiders, 29.55K shares (2.69%) are held directly and 1.07Mn shares (97.31%) indirectly, through trusts, partnerships, family members and other entities.
The insider holdings in Adicet Bio belong to 10 insiders who have reported on Form 4 within the past two years.
Adicet Bio's top three insider holders by shares held are Ra Capital Management, L.P. (10% owner, 932.62K shares), Andrew Sinclair (Director, 133.32K shares) and Chen Schor (President & CEO, 12.88K shares).
The largest insider, Ra Capital Management, L.P., holds 84.75% of ACET's insider total.
Institutional holders reported 56.86% of Adicet Bio's outstanding shares for Q2 2026; insiders' latest Form 4 filings put their stake at about 10.24%, and other investors, including the public, hold the remaining 32.90%.
Over the trailing 12 months, 13 insiders reported transactions in ACET stock across 21 Form 4 filings.
The insider data for ACET reflects Form 4 filings through August 7, 2026.

Form 4 Holdings

Insiders Holding ACET

Insiders 15

Shares held 970.75K

Of outstanding 9.03%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Capital Management, L.P. Ra	TenPercentOwner	0	932,624	932,624	96.1%	29 Apr, 2026
2	Chen Schor	President Ceo	6,820	0	6,820	0.7%	27 Jan, 2026
3	Lloyd Klickstein	Chief Innovation Officer	6,785	0	6,785	0.7%	13 Jun, 2025
4	Francesco Galimi	Svp Chief Medical Officer	6,363	0	6,363	0.7%	26 Jan, 2024
5	Brian Nicholas Harvey	Chief Financial Officer	5,145	0	5,145	0.5%	27 Jan, 2026
6	Don Healey	Chief Technology Officer	3,452	0	3,452	0.4%	27 Jan, 2026
7	Blake Aftab	Chief Scientific Officer	2,981	0	2,981	0.3%	27 Jan, 2026
8	Steve Dubin	Director	1,419	0	1,419	0.1%	13 Jun, 2025
9	Andrew Sinclair	Director	1,106	0	1,106	0.1%	13 Jun, 2025
10	Jeffrey Chodakewitz	Director	1,106	0	1,106	0.1%	13 Jun, 2025
11	Carl L Gordon	Director, TenPercentOwner	738	0	738	0.1%	07 Jun, 2024
12	Katie Peng	Director	738	0	738	0.1%	13 Jun, 2025
13	Aya Jakobovits	Director	738	0	738	0.1%	07 Jun, 2024
14	Michael Kauffman	Director	369	0	369	0.0%	07 Jun, 2024
15	Bastiano Sanna	Director	369	0	369	0.0%	02 Jun, 2023

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

562 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
05 Aug, 2026	Lloyd Klickstein	Chief Medical Officer	Acquired A	18,300	$0.00	$0	18,300	Direct
21 Jun, 2026	Lloyd Klickstein	Director	Acquired A	4,200	$0.00	$0	4,200	Direct
21 Jun, 2026	Michael Grissinger	Director	Acquired A	4,200	$0.00	$0	4,200	Direct
21 Jun, 2026	Jeffrey Chodakewitz	Director	Acquired A	4,200	$0.00	$0	4,200	Direct
19 Jun, 2026	Blake Aftab	Chief Scientific Officer	Acquired A	55,000	$0.00	$0	55,000	Direct
21 Jun, 2026	Andrew Sinclair	Director	Acquired A	4,200	$0.00	$0	4,200	Direct
21 Jun, 2026	Steve Dubin	Director	Acquired A	4,200	$0.00	$0	4,200	Direct
21 Jun, 2026	Katie Peng	Director	Acquired A	4,200	$0.00	$0	4,200	Direct
19 Jun, 2026	Chen Schor	President Ceo	Acquired A	55,000	$0.00	$0	55,000	Direct
27 Apr, 2026	Capital Management, L.P. Ra	TenPercentOwner	Disposed J	250,000	—	—	932,624	Indirect
27 Apr, 2026	Capital Management, L.P. Ra	TenPercentOwner	Acquired J	250,000	—	—	1,402,833	Indirect
18 Feb, 2026	Capital Management, L.P. Ra	TenPercentOwner	Acquired P	74,577	$7.04	$525.02K	1,033,605	Indirect
19 Feb, 2026	Capital Management, L.P. Ra	TenPercentOwner	Acquired P	74,268	$7.21	$535.47K	1,107,873	Indirect
20 Feb, 2026	Capital Management, L.P. Ra	TenPercentOwner	Acquired P	74,751	$7.27	$543.44K	1,182,624	Indirect
07 Apr, 2026	Advisors Llc Orbimed	TenPercentOwner	Disposed S	29,319	$6.53	$191.45K	34,923	Indirect
07 Apr, 2026	Advisors Llc Orbimed	TenPercentOwner	Disposed S	2,400	$6.38	$15.31K	32,523	Indirect
08 Apr, 2026	Advisors Llc Orbimed	TenPercentOwner	Disposed S	32,523	$6.29	$204.57K	0	Indirect
08 Apr, 2026	Advisors Llc Orbimed	TenPercentOwner	Disposed S	40,416	$6.52	$263.51K	0	Indirect
25 Mar, 2026	Brian Nicholas Harvey	Chief Financial Officer	Acquired A	43,361	$0.00	$0	43,361	Direct
25 Mar, 2026	Don Healey	Chief Technology Officer	Acquired A	43,361	$0.00	$0	43,361	Direct

Showing 1 to 20 of 562 transactions