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.

Q4 2025 vs. Q3 2025

How the institutions holding Arcellx, Inc. changed between Q3 2025 and Q4 2025.

All holders in Q4 2025 All holders in Q3 2025

13F holders of ACLX: Q3 2025 compared with Q4 2025
Measure	Q3 2025	Of which not filed for Q4 2025	Q4 2025	Change
Holders	209	2	218	+11
Shares	63.1M	4.40K	66.6M	+3.56M (+5.6%)
Value	$5.18B	$361.2K	$4.34B	−$833.5M (−16.1%)

2 institutions that held it in Q3 2025 haven't filed for Q4 2025 yet. Not filing isn't selling, so the changes leave them out.

New holders (42)

Institutions that held Arcellx, Inc. at the end of Q4 2025 but not at the end of Q3 2025.

Institutions new to ACLX in Q4 2025
Institution	Shares	Value	% of portfolio
Hudson Bay Capital Management LP	400,942	$26.1M	0.15%
Hood River Capital Management LLC	335,500	$21.9M	0.24%
Fisher Asset Management, LLC	322,855	$21.1M	0.01%
Catalio Capital Management, LP	156,109	$10.2M	1.80%
Clough Capital Partners L P	129,780	$8.46M	0.76%
Qube Research & Technologies Ltd	97,906	$6.38M	0.01%
Candriam Luxembourg S.C.A.	96,420	$6.29M	0.03%
XTX Topco Ltd	72,583	$4.73M	0.12%
Standard Life Aberdeen plc	60,364	$3.94M	0.01%
Squarepoint Ops LLC	49,875	$3.25M	0.01%
Tudor Investment Corp Et Al	46,029	$3.00M	0.02%
J. Goldman & Co LP	31,219	$2.04M	0.08%
D. E. Shaw & Co., Inc.	25,165	$1.64M	0.00%
First Trust Advisors LP	20,896	$1.36M	0.00%
Norges Bank	16,707	$1.09M	0.00%
Trexquant Investment LP	14,915	$972.5K	0.01%
Shay Capital LLC	11,400	$743.3K	0.12%
State of New Jersey Common Pension Fund D	9,465	$617.1K	0.00%
Marshall Wace, LLP	8,442	$550.4K	0.00%
PSP Research LLC	8,224	$536.2K	0.47%
Aspiriant, LLC	7,910	$515.7K	0.01%
Headlands Technologies LLC	7,320	$477.3K	0.04%
Twinbeech Capital LP	6,949	$453.1K	0.03%
Banque Pictet & Cie SA	5,109	$333.1K	0.00%
Marks Group Wealth Management, Inc	4,524	$295.0K	0.03%
Quantinno Capital Management LP	3,871	$252.4K	0.00%
Harbour Capital Advisors, LLC	3,825	$242.3K	0.05%
Simplex Trading, LLC	3,414	$222.6K	0.01%
Man Group plc	3,322	$216.6K	0.00%
Jones Financial Companies LLLP	967	$63.0K	0.00%
Los Angeles Capital Management LLC	176	$15.4K	0.00%
Keating Financial Advisory Services, Inc.	210	$13.7K	0.00%
Kemnay Advisory Services Inc.	179	$11.7K	0.00%
Pinnacle Wealth Planning Services, Inc.	160	$10.4K	0.00%
Northwestern Mutual Wealth Management Co	25	$1.63K	0.00%
First Horizon Corp	23	$1.50K	0.00%
Basecamp Wealth Advisors LLC	20	$1.30K	0.00%
Cornerstone Financial Management LLC	15	$978	0.00%
Ronald Blue Trust, Inc.	8	$522	0.00%
TD Private Client Wealth LLC	2	$130	0.00%
Hughes Financial Services, LLC	2	$130	0.00%
Dunhill Financial, LLC	1	$44	0.00%

Sold out (31)

Institutions that held Arcellx, Inc. at the end of Q3 2025 and filed for Q4 2025 without it.

Institutions that sold out of ACLX in Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
Capital World Investors	783,011	$64.3M
Cormorant Asset Management, LP	775,000	$63.6M
First Turn Management, LLC	313,733	$25.8M
Baker Bros. Advisors LP	166,825	$13.7M
Monaco Asset Management SAM	78,589	$6.45M
Nicholas Investment Partners, LP	58,894	$4.84M
Pathway Capital Management, LP	51,051	$4.19M
Jain Global LLC	50,011	$4.11M
Balyasny Asset Management LLC	48,691	$4.00M
Dark Forest Capital Management LP	36,794	$3.02M
Sector Gamma AS	32,009	$2.63M
Blue Owl Capital Holdings LP	26,823	$2.20M
SummitTX Capital, L.P.	25,448	$2.09M
Alps Advisors Inc	25,188	$2.07M
Cinctive Capital Management LP	13,626	$1.12M
Fred Alger Management, LLC	11,895	$976.6K
Jefferies Financial Group Inc.	10,500	$862.0K
Lighthouse Investment Partners, LLC	10,500	$862.0K
Connor, Clark & Lunn Investment Management Ltd.	9,910	$813.6K
Legato Capital Management LLC	7,675	$630.1K
Aquatic Capital Management LLC	5,232	$429.5K
Integrated Wealth Concepts LLC	3,423	$281.0K
Quarry LP	3,376	$277.2K
Xponance, Inc.	2,694	$221.2K
Principal Financial Group Inc	2,622	$215.3K
Wexford Capital LP	686	$56.3K
MAI Capital Management	318	$26.1K
J.Safra Asset Management Corp	40	$3.28K
Marquette Asset Management, LLC	22	$1.81K
Essential Partners LLC	18	$1.48K
Rise Advisors, LLC	7	$575

Not filed for Q4 2025 yet (2)

Institutions that held Arcellx, Inc. at the end of Q3 2025 and haven't filed a 13F for Q4 2025. Not filing isn't selling, so they aren't counted as sold out.

Institutions holding ACLX in Q3 2025 that haven't filed for Q4 2025
Institution	Shares, Q3 2025	Value, Q3 2025
CIBC Bancorp USA Inc.	3,650	$299.7K
Abich Financial Wealth Management LLC	750	$61.6K