Arcellx, Inc.

ACLXDelisted Apr 28, 2026

Industry: Biological Products, (No Diagnostic Substances)
SEC CIK: 0001786205

SEC filings (opens in a new tab)

Arcellx, Inc. was delisted on Apr 28, 2026; its insiders filed their last Form 4 on Apr 28, 2026; 240 institutions reported holding it in 13F filings for Q1 2026, worth $6.52B in total; Soros Fund Management was the only superinvestor holding it.

Q3 2025 vs. Q2 2025

How the institutions holding Arcellx, Inc. changed between Q2 2025 and Q3 2025.

All holders in Q3 2025 All holders in Q2 2025

13F holders of ACLX: Q2 2025 compared with Q3 2025
Measure	Q2 2025	Of which not filed for Q3 2025	Q3 2025	Change
Holders	203	3	209	+9
Shares	61.4M	22.0K	63.1M	+1.70M (+2.8%)
Value	$4.01B	$1.45M	$5.18B	+$1.17B (+29.1%)

3 institutions that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (30)

Institutions that held Arcellx, Inc. at the end of Q3 2025 but not at the end of Q2 2025.

Institutions new to ACLX in Q3 2025
Institution	Shares	Value	% of portfolio
Logos Global Management LP	165,000	$13.5M	1.34%
Integral Health Asset Management, LLC	150,000	$12.3M	0.90%
Monaco Asset Management SAM	78,589	$6.45M	2.40%
Jane Street Group, LLC	74,481	$6.11M	0.01%
Pathway Capital Management, LP	51,051	$4.19M	20.60%
Blue Owl Capital Holdings LP	26,823	$2.20M	0.68%
SummitTX Capital, L.P.	25,448	$2.09M	0.09%
Y-Intercept (Hong Kong) Ltd	15,508	$1.27M	0.03%
Fred Alger Management, LLC	11,895	$976.6K	0.00%
Lighthouse Investment Partners, LLC	10,500	$862.0K	0.03%
ExodusPoint Capital Management, LP	9,446	$775.5K	0.01%
Aquatic Capital Management LLC	5,232	$429.5K	0.01%
Universal- Beteiligungs- und Servicegesellschaft mbH	4,048	$332.3K	0.00%
CIBC Bancorp USA Inc.	3,650	$299.7K	0.00%
Mercer Global Advisors Inc	3,452	$283.4K	0.00%
Virginia Retirement Systems Et Al	3,100	$254.5K	0.00%
Advisory Alpha, LLC	3,000	$246.7K	0.01%
SEI Investments Co	2,895	$237.7K	0.00%
Xponance, Inc.	2,694	$221.2K	0.00%
Principal Financial Group Inc	2,622	$215.3K	0.00%
Abich Financial Wealth Management LLC	750	$61.6K	0.02%
Group One Trading, L.P.	581	$47.7K	0.00%
Ramirez Asset Management, Inc.	500	$41.0K	0.01%
MAI Capital Management	318	$26.1K	0.00%
Marquette Asset Management, LLC	22	$1.81K	0.00%
Essential Partners LLC	18	$1.48K	0.00%
Quadrant Capital Group LLC	14	$1.15K	0.00%
Rockefeller Capital Management L.P.	8	$657	0.00%
Rise Advisors, LLC	7	$575	0.00%
Massmutual Trust Co FSB	1	$82	0.00%

Sold out (21)

Institutions that held Arcellx, Inc. at the end of Q2 2025 and filed for Q3 2025 without it.

Institutions that sold out of ACLX in Q3 2025
Institution	Shares, Q2 2025	Value, Q2 2025
Marshall Wace, LLP	111,808	$7.36M
Great Point Partners LLC	100,000	$6.58M
Decheng Capital LLC	547,609	$4.46M
Voloridge Investment Management, LLC	66,422	$4.37M
Trexquant Investment LP	43,183	$2.84M
Tudor Investment Corp Et Al	23,197	$1.53M
XTX Topco Ltd	16,787	$1.11M
Squarepoint Ops LLC	16,044	$1.06M
Qube Research & Technologies Ltd	11,772	$775.2K
Quantessence Capital LLC	4,750	$312.8K
EntryPoint Capital, LLC	3,634	$239.3K
Bellevue Group AG	3,000	$197.6K
Allostery Investments LP	1,000	$65.8K
Lazard Asset Management LLC	735	$48.0K
Turim 21 Investimentos Ltda.	179	$11.8K
Natixis	80	$5.27K
MPM Oncology Impact Management LP	37	$2.44K
Clearstead Advisors, LLC	33	$2.17K
Wolff Wiese Magana LLC	17	$1.12K
Skopos Labs, Inc.	15	$988
Twin Peaks Wealth Advisors, LLC	1	$73

Not filed for Q3 2025 yet (3)

Institutions that held Arcellx, Inc. at the end of Q2 2025 and haven't filed a 13F for Q3 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ACLX in Q2 2025 that haven't filed for Q3 2025
Institution	Shares, Q2 2025	Value, Q2 2025
Norges Bank	11,221	$738.9K
E Fund Management Co., Ltd.	6,293	$414.4K
CIBC World Markets Corp	4,511	$297.0K