Adicet Bio ACET Institutional Ownership

NASDAQ ACET

$4.28 -0.21 (-4.68%)

At close: Oct 22, 2026 · 4:00 PM EDT

Institutions by Trading Activity

56 Institutions

Increased 32 57.1%

Unchanged 15 26.8%

Reduced 9 16.1%

Ownership Statistics

13F · as of 30 Jun, 2026

Institutional Ownership

56.86%

▼-0.44 pp QoQ

Shares Held by Institutions

6.11Mn

of 10.75Mn outstanding

▼-0.75% QoQ

Shares Outstanding

10.75Mn

4.64Mn held outside 13F filers

Institutional Investors

filed 13F for Jun 2026

▲+9 vs prior quarter

Net Shares Added (QoQ)

-46.47K

distributed since last quarter

Value of Holdings

$27.43Mn

reported market value

Shares Owned by Institutions

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Institutions

Accumulated Distributed

Latest quarter —

Net over range —

Accumulating quarters —

Ownership Summary

Updated Oct 11, 2026

Adicet Bio, Inc. (NASDAQ:ACET) appeared in the 13F filings of 56 institutional investors for the quarter ended June 30, 2026.

Their combined stake equaled 56.86% of outstanding shares in Q2 2026, down from 57.30% in Q1 2026.
Total shares held in ACET fell 0.75% from Q1 2026; the number of holders rose 19.15% from Q2 2025.
Of the 56 holders of ACET in Q2 2026, 32 added to their positions, 9 reduced their stakes and 15 left their positions unchanged.
Combined, institutional investors held 6.11Mn shares of ACET as of Q2 2026, down 46.47K from the prior quarter and up 2.92Mn from a year earlier.
Ra Capital Management, L.P. was the top holder of Adicet Bio as of June 30, 2026, with 932.62K shares, or 8.68% of shares outstanding.
The largest position increases in ACET for Q2 2026 were by Two Sigma Investments, LP (+53.73K shares), Citadel Advisors LLC (+50.91K shares), Trexquant Investment LP (+34.34K shares), Jane Street Group, LLC (+33.48K shares) and Renaissance Technologies LLC (+33.35K shares).
Among holders that kept a stake in Adicet Bio, the biggest sellers in Q2 2026 were Ra Capital Management, L.P. (-250K shares), OrbiMed Advisors LLC (-183.16K shares), UBS Group AG (-8.55K shares), Geode Capital Management, LLC (-5.5K shares) and Rangeley Capital, LLC (-5.11K shares).
Adicet Bio's 10 largest institutional shareholders as of Q2 2026 were Ra Capital Management, L.P. (932.62K shares), OrbiMed Advisors LLC (844.79K shares), Franklin Templeton Inc (626.57K shares), Citadel Advisors LLC (432.74K shares), Vanguard Capital Management LLC (343.23K shares), Adage Capital Partners GP, L.L.C. (274.38K shares), Renaissance Technologies LLC (265.94K shares), Stonepine Capital Management, LLC (245.52K shares), Alyeska Investment Group, L.P. (203.8K shares) and Schonfeld Strategic Advisors LLC (195.51K shares), per Business Quant data.

Form 13F Holdings

56 Institutional Holders

Report period 30 Jun, 2026

Total shares held 6.11Mn

Of outstanding 56.86%

#	Institution	CIK	Shares Held	% of Outstanding	Change (QoQ)	Change (%)	Value (USD)
1	RA CAPITAL MANAGEMENT, L.P.	0001346824	932,624	8.68%	▼250,000	-21.14%	$8.06Mn
2	ORBIMED ADVISORS LLC	0001055951	844,787	7.86%	▼183,157	-17.82%	$7.30Mn
3	Franklin Templeton Inc	0000038777	626,571	5.83%	0	0.00%	$5.41Mn
4	CITADEL ADVISORS LLC	0001423053	432,738	4.03%	▲50,915	+13.33%	$3.74Mn
5	VANGUARD CAPITAL MANAGEMENT LLC	0002100119	343,228	3.19%	▲6,704	+1.99%	$2.97Mn
6	ADAGE CAPITAL PARTNERS GP, L.L.C.	0001165408	274,375	2.55%	0	0.00%	$2.37Mn
7	RENAISSANCE TECHNOLOGIES LLC	0001037389	265,945	2.47%	▲33,354	+14.34%	$2.30Mn
8	Stonepine Capital Management, LLC	0001440771	245,518	2.28%	▲23,563	+10.62%	$2.12Mn
9	Alyeska Investment Group, L.P.	0001453072	203,799	1.90%	0	0.00%	$1.76Mn
10	Schonfeld Strategic Advisors LLC	0001665241	195,514	1.82%	▲195,514	0.00%	$1.69Mn
11	Carlyle Group Inc.	0001527166	184,295	1.72%	0	0.00%	$1.59Mn
12	NEXTBio Capital Management LP	0002038158	157,827	1.47%	0	0.00%	$1.36Mn
13	ACADIAN ASSET MANAGEMENT LLC	0000916542	124,832	1.16%	▲6,694	+5.67%	$1.08K
14	TWO SIGMA INVESTMENTS, LP	0001179392	96,839	0.90%	▲53,733	+124.65%	$836.69K
15	GEODE CAPITAL MANAGEMENT, LLC	0001214717	95,634	0.89%	▼5,501	-5.44%	$826.70K
16	DAFNA Capital Management LLC	0001389933	93,812	0.87%	0	0.00%	$810.54K
17	BRIDGEWAY CAPITAL MANAGEMENT, LLC	0001107261	85,959	0.80%	▲85,959	0.00%	$742.69K
18	MARSHALL WACE, LLP	0001318757	79,488	0.74%	▲79,488	0.00%	$686.78K
19	Trexquant Investment LP	0001633445	78,002	0.73%	▲34,336	+78.63%	$673.94K
20	JANE STREET GROUP, LLC	0001595888	70,561	0.66%	▲33,477	+90.27%	$609.65K

Showing 1 to 20 of 56 holders