Arcellx Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGS:ACLX Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
19 Feb 26	SellUS$572,568	Michelle Gilson	Individual	8,384	US$69.38
17 Feb 26	SellUS$784,783	Michelle Gilson	Individual	11,291	US$70.01
14 Jan 26	SellUS$402,997	Christopher Heery	Individual	5,882	US$68.51
13 Jan 26	SellUS$487,213	Christopher Heery	Individual	7,437	US$65.51
12 Jan 26	SellUS$393,286	Christopher Heery	Individual	6,131	US$64.15
13 Aug 25	SellUS$743,767	New Enterprise Associates, Inc.	Company	10,369	US$72.66
13 Aug 25	SellUS$669,529	Mohamad Makhzoumi	Individual	9,557	US$70.97
13 Aug 25	SellUS$654,093	Forest Baskett	Individual	9,136	US$72.67

Insider Trading Volume

Insider Buying: ACLX insiders have only sold shares in the past 3 months.

Ownership Breakdown

What is the ownership structure of ACLX?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	892,761	1.32%
VC/PE Firms	3,045,262	4.5%
Public Companies	6,720,803	9.92%
Hedge Funds	8,649,016	12.8%
Institutions	48,432,773	71.5%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 100.26% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
20.8%	T. Rowe Price Group, Inc.	12,134,719	US$1.4b	59.3%	0.11%
11.5%	Gilead Sciences, Inc.	6,720,803	US$768.2m	0%	no data
9.79%	Paradigm Biocapital Advisors LP	5,724,016	US$654.3m	23.1%	15.59%
6.98%	The Vanguard Group, Inc.	4,081,519	US$466.5m	4.46%	0.01%
6.09%	FMR LLC	3,563,526	US$407.3m	-38.2%	0.02%
6.07%	BlackRock, Inc.	3,548,777	US$405.6m	4.75%	no data
5.21%	New Enterprise Associates, Inc.	3,045,262	US$348.1m	0%	14.96%
5%	Vestal Point Capital, LP	2,925,000	US$334.3m	134%	11.54%
4.01%	SR One Capital Management, LP	2,346,630	US$268.2m	0%	28.02%
3.42%	State Street Global Advisors, Inc.	1,998,503	US$228.4m	31%	0.01%
2.57%	Citadel Advisors LLC	1,500,223	US$171.5m	46.9%	0.12%
2.51%	Perceptive Advisors LLC	1,466,071	US$167.6m	-40.6%	3.01%
2.43%	JP Morgan Asset Management	1,419,199	US$162.2m	67.5%	0.01%
2.17%	RA Capital Management, L.P.	1,267,156	US$144.8m	-58.3%	1.46%
1.64%	Geode Capital Management, LLC	958,057	US$109.5m	3.43%	0.01%
1.57%	Janus Henderson Group plc	919,578	US$105.1m	-9.3%	0.04%
1.34%	Rami Elghandour	782,467	US$89.4m	26.6%	no data
1.26%	Woodline Partners LP	737,824	US$84.3m	206%	0.32%
1.04%	Baron Capital Group, Inc.	609,697	US$69.7m	10.8%	0.18%
0.9%	The Goldman Sachs Group, Inc.	526,510	US$60.2m	40.4%	0.02%
0.9%	Affinity Asset Advisors, LLC	523,725	US$59.9m	4.75%	3.92%
0.83%	Morgan Stanley	486,406	US$55.6m	20.4%	no data
0.82%	UBS Asset Management AG	477,647	US$54.6m	33.4%	no data
0.77%	Lord, Abbett & Co. LLC	449,634	US$51.4m	6.05%	0.15%
0.72%	American Century Investment Management Inc	419,080	US$47.9m	1.74%	0.02%

Company Analysis and Financial Data Status

Data	Last Updated (UTC time)
Company Analysis	2026/03/05 06:55
End of Day Share Price	2026/03/05 00:00
Earnings	2025/12/31
Annual Earnings	2025/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

Package	Data	Timeframe	Example US Source ^*
Company Financials	10 years	Income statement Cash flow statement Balance sheet	SEC Form 10-K SEC Form 10-Q
Analyst Consensus Estimates	+3 years	Forecast financials Analyst price targets	Analyst Research Reports Blue Matrix
Market Prices	30 years	Stock prices Dividends, Splits and Actions	ICE Market Data SEC Form S-1
Ownership	10 years	Top shareholders Insider trading	SEC Form 4 SEC Form 13D
Management	10 years	Leadership team Board of directors	SEC Form 10-K SEC Form DEF 14A
Key Developments	10 years	Company announcements	SEC Form 8-K

^* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Arcellx, Inc. is covered by 25 analysts. 15 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

Analyst	Institution
Jack Allen	Baird
Jason Matthew Gerberry	BofA Global Research
John Newman	Canaccord Genuity