Ticker · CUSIP 03940C100

ACLX

ARCELLX INC

Healthcare·Biotechnology

···Share

Holders (tracked)

Combined shares

4,398,434

Combined value

$286.78M

Last close

$115.05

Quarter

2025Q4

Price is +76.5% vs the avg quarter-end implied price across tracked holders.

Price · 1Y$115.05+53.03 (+85.50%)H $115.10 · L $52.80 · Avg Vol 1.1M

Position opened

Tracked holders · last 8 quarters

+4 vs previous quarter over the last 8.

SEC event timeline

17 events

Ken Griffin (Citadel Advisors) added2026-02-17
+478,770 shares · 2025Q4
Position
D.E. Shaw & Co. opened position2026-02-17
+25,165 shares · 2025Q4
Position
Izzy Englander (Millennium Mgmt) trimmed2026-02-17
−31,520 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) opened position2026-02-17
+46,029 shares · 2025Q4
Position
T. Rowe Price added2026-02-17
+346,750 shares · 2025Q4
Position
Wellington Management trimmed2026-02-17
−17,423 shares · 2025Q4
Position
Ron Baron (Baron Capital / BAMCO) added2026-02-17
+59,461 shares · 2025Q4
Position
AQR Capital Management trimmed2026-02-17
−23,755 shares · 2025Q4
Position
Norges Bank (Norway SWF) opened position2026-02-10
+16,707 shares · 2025Q4
Position
Ken Fisher (Fisher Asset Mgmt) opened position2026-02-09
+322,855 shares · 2025Q4
Position
Paul Tudor Jones (Tudor Investment) exited2025-12-09
−23,197 shares · 2025Q3
Position
T. Rowe Price trimmed2025-11-14
−174,722 shares · 2025Q3
Position
Wellington Management trimmed2025-11-14
−9,210 shares · 2025Q3
Position
Ron Baron (Baron Capital / BAMCO) added2025-11-14
+32,227 shares · 2025Q3
Position
AQR Capital Management added2025-11-14
+23,158 shares · 2025Q3
Position
Izzy Englander (Millennium Mgmt) trimmed2025-11-14
−54,221 shares · 2025Q3
Position
Norges Bank (Norway SWF) exited2025-11-13
−11,221 shares · 2025Q3
Position

Insider activity

No insider transactions in the last 30 days.

View full insider history for ACLX →

Follow-the-investor returns

If you'd copied each holder of ACLX…

Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.

Investor	First in	Cost basis	Return	Position value today
T. Rowe Price	2022Q4	$54.24	+112.1%	$185.3M
Norges Bank (Norway SWF)	2022Q4	$54.48	+111.2%	$1.9M
D.E. Shaw & Co.	2022Q4	$56.63	+103.2%	$2.9M
Ron Baron (Baron Capital / BAMCO)	2023Q2	$63.22	+82.0%	$70.1M
Wellington Management	2022Q4	$63.93	+80.0%	$24.7M
Ken Fisher (Fisher Asset Mgmt)	2025Q4	$65.20	+76.5%	$37.1M
Ken Griffin (Citadel Advisors)	2022Q1	$65.26	+76.3%	$3.5M
Ken Griffin (Citadel Advisors)	2022Q1	$65.26	+76.3%	$3.5M
Ken Griffin (Citadel Advisors)	2022Q1	$65.26	+76.3%	$3.5M
Izzy Englander (Millennium Mgmt)	2022Q1	$65.73	+75.0%	$1.0M
Paul Tudor Jones (Tudor Investment)	2024Q3	$66.91	+72.0%	$5.3M
AQR Capital Management	2023Q2	$72.69	+58.3%	$916K

Who moved on this name in 2025Q4

Position changes reported for the latest quarter, grouped by direction.

New positions4

Ken Fisher (Fisher Asset Mgmt)
+322,855
$21.1M
Paul Tudor Jones (Tudor Investment)
+46,029
$3.0M
D.E. Shaw & Co.
+25,165
$1.6M
Norges Bank (Norway SWF)
+16,707
$1.1M

Added to3

Ken Griffin (Citadel Advisors)
+478,770
$31.2M
Ron Baron (Baron Capital / BAMCO)
+59,461
$3.9M
T. Rowe Price
+346,750
$23K

Trimmed3

Izzy Englander (Millennium Mgmt)
−31,520
$2.1M
AQR Capital Management
−23,755
$1.5M
Wellington Management
−17,423
$1.1M

Exited0

—

Institutional ownership over time

Distinct super-investors holding this ticker · combined dollar value, by quarter.

Quarter	Holders	Shares	Combined value	Δ holders
2022Q1	3	1,910,346	$26.3M	—
2022Q2	4	2,484,112	$44.3M	+1
2022Q3	5	3,725,378	$69.9M	+1
2022Q4	11	4,578,331	$141.8M	+6
2023Q1	10	4,177,706	$128.7M	-1
2023Q2	12	5,103,608	$161.4M	+2
2023Q3	11	4,021,599	$144.3M	-1
2023Q4	10	4,679,624	$259.7M	-1
2024Q1	12	5,150,308	$358.2M	+2
2024Q2	10	5,683,499	$313.7M	-2
2024Q3	12	2,487,779	$207.8M	+2
2024Q4	12	2,770,550	$212.5M	—
2025Q1	12	3,272,147	$214.7M	—
2025Q2	10	2,650,091	$174.5M	-2
2025Q3	8	3,174,795	$260.7M	-2
2025Q4	12	4,398,434	$286.8M	+4

Who owns ACLX

12 super-investors · 2025Q4

Tracked stake

4.40M

Combined value

$287M

% of shares outstanding

—

shares-out unknown

Quarter action mix

New4Added5Trim3

#	Manager	Shares	Value	% of book	Last action	8Q trend
1	T. Rowe Price	1.61M	$105M	0.0%	Added+346.8K
2	Ken Griffin Citadel Advisors	1.50M	$98M	0.0%	Added+478.8K
3	Ron Baron Baron Capital / BAMCO	609.7K	$40M	0.1%	Added+59.5K
4	Ken Fisher Fisher Asset Mgmt	322.9K	$21M	0.0%	New+322.9K	—
5	Wellington Management	214.8K	$14M	0.0%	Trim−17.4K
6	Paul Tudor Jones Tudor Investment	46.0K	$3M	0.0%	New+46.0K
7	Ken Griffin Citadel Advisors	30.2K	$2M	0.0%	Added+478.8K
8	D.E. Shaw & Co.	25.2K	$2M	0.0%	New+25.2K
9	Norges Bank Norway SWF	16.7K	$1M	0.0%	New+16.7K
10	Izzy Englander Millennium Mgmt	8.8K	$575K	0.0%	Trim−31.5K
11	AQR Capital Management	8.0K	$519K	0.0%	Trim−23.8K
12	Ken Griffin Citadel Advisors	5.2K	$339K	0.0%	Added+478.8K

Recent moves

20 transactions

NEWD.E. Shaw & Co.
+25,165 · 2025Q4
ADDRon Baron (Baron Capital / BAMCO)
+59,461 · 2025Q4
ADDT. Rowe Price
+346,750 · 2025Q4
NEWPaul Tudor Jones (Tudor Investment)
+46,029 · 2025Q4
TRIMAQR Capital Management
−23,755 · 2025Q4
ADDKen Griffin (Citadel Advisors)
+478,770 · 2025Q4
TRIMWellington Management
−17,423 · 2025Q4
TRIMIzzy Englander (Millennium Mgmt)
−31,520 · 2025Q4
NEWNorges Bank (Norway SWF)
+16,707 · 2025Q4
NEWKen Fisher (Fisher Asset Mgmt)
+322,855 · 2025Q4
SOLDPaul Tudor Jones (Tudor Investment)
−23,197 · 2025Q3
TRIMWellington Management
−9,210 · 2025Q3
ADDRon Baron (Baron Capital / BAMCO)
+32,227 · 2025Q3
TRIMT. Rowe Price
−174,722 · 2025Q3
TRIMIzzy Englander (Millennium Mgmt)
−54,221 · 2025Q3
ADDAQR Capital Management
+23,158 · 2025Q3
SOLDNorges Bank (Norway SWF)
−11,221 · 2025Q3
ADDIzzy Englander (Millennium Mgmt)
+43,506 · 2025Q2
TRIMT. Rowe Price
−400,851 · 2025Q2
SOLDTwo Sigma Investments
−6,900 · 2025Q2

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