Arcellx Ownership | Who Owns Arcellx?

Overview Forecast RevenueFinancials Chart

Arcellx Ownership Summary

Arcellx is owned by 109.16% institutional investors, 14.43% insiders. Fmr is the largest institutional shareholder, holding 14.78% of ACLX shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 3.13% of its assets in Arcellx shares.

ACLX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Arcellx	109.16%	14.43%	-23.60%
Sector	Healthcare Stocks	487.91%	11.08%	-398.99%
Industry	Biotech Stocks	307.10%	11.11%	-218.21%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Fmr	7.96M	14.78%	$610.19M
Gilead sciences	6.72M	12.49%	$515.42M
Paradigm biocapital advisors lp	4.37M	8.12%	$335.26M
Blackrock	3.52M	6.67%	$194.07M
Nea management company	3.75M	6.66%	$246.63M
Vanguard group	3.33M	6.19%	$255.38M
Blackrock funding, inc. /de	3.47M	6.17%	$228.38M
Ra capital management	3.04M	5.40%	$199.96M
Vestal point capital, lp	2.75M	4.89%	$181.09M
Perceptive advisors	2.48M	4.41%	$163.18M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Aju ib investment	1.05M	75.07%	$68.98M
Sr one capital management, lp	2.35M	43.88%	$179.96M
Gilead sciences	6.72M	33.23%	$515.42M
Nea management company	3.75M	18.56%	$246.63M
Paradigm biocapital advisors lp	4.37M	11.66%	$335.26M
Vestal point capital, lp	2.75M	9.53%	$181.09M
Perceptive advisors	2.48M	6.05%	$163.18M
Affinity asset advisors	495.00K	4.45%	$32.60M
Great point partners	100.00K	4.28%	$6.58M
Stempoint capital lp	201.45K	4.26%	$13.27M

Top Buyers

Holder	Shares	% Assets	Change
Gilead sciences	6.72M	33.23%	6.72M
Fmr	7.96M	0.04%	1.48M
Vanguard group	3.33M	0.00%	868.00K
Decheng capital	547.61K	1.13%	497.61K
Blackrock	3.52M	0.00%	450.30K

Top Sellers

Holder	Shares	% Assets	Change
Suvretta capital management	-	-	-689.95K
Blackrock funding, inc. /de	3.47M	0.00%	-499.38K
Janus henderson group	1.56M	0.06%	-454.86K
Perceptive advisors	2.48M	6.05%	-448.48K
Lord, abbett	337.58K	0.07%	-326.95K

New Positions

Holder	Shares	% Assets	Change	Value
Gilead sciences	6.72M	33.23%	6.72M	$515.42M
Rock springs capital management lp	186.31K	0.76%	186.31K	$12.27M
Baker bros. advisors lp	166.82K	0.11%	166.82K	$10.99M
Schroder investment management group	60.00K	0.00%	60.00K	$3.95M
Balyasny asset management	54.79K	0.01%	54.79K	$3.61M

Sold Out

Holder	Change
Quantbot technologies lp	-1.00
Ifp advisors	-2.00
Principal securities	-3.00
Ronald blue trust	-11.00
Stephens consulting	-15.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Jun 30, 2025	209	-0.48%	61,373,108	-0.32%	109	0.88%	91	-11.65%	83	16.90%
Mar 31, 2025	209	-5.00%	61,558,855	4.06%	111	0.92%	103	-18.25%	71	22.41%
Dec 31, 2024	218	8.46%	58,110,509	17.41%	107	1.28%	123	14.95%	59	-3.28%
Sep 30, 2024	201	19.64%	49,489,251	-1.47%	91	1.04%	108	6.93%	61	22.00%
Jun 30, 2024	165	-10.33%	50,204,759	6.85%	95	1.18%	99	-8.33%	49	-15.52%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	1.74M	3.13%	-36.26K
Fidelity Growth Compy Commingled Pl S	1.03M	1.85%	101.33K
iShares Russell 2000 ETF	882.89K	1.59%	-
Fidelity Growth Compy Commingled Pl O	764.28K	1.42%	-
American Funds SMALLCAP World A	783.01K	1.42%	73.64K
Fidelity Growth Company Fund	773.52K	1.39%	81.07K
SPDR® S&P Biotech ETF	688.11K	1.24%	1.53K
Vanguard Small Cap Index	668.59K	1.21%	-4.27K
T. Rowe Price Small-Cap Stock	587.70K	1.06%	87.33K
Fidelity Select Biotechnology	552.00K	1.00%	-19.90K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Oct 15, 2025	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$488.32K
Oct 03, 2025	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$419.87K
Oct 06, 2025	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$91.73K
Sep 30, 2025	Heery Christopher	CHIEF MEDICAL OFFICER	Sell	$125.76K
Sep 30, 2025	Heery Christopher	CHIEF MEDICAL OFFICER	Sell	$426.92K

Insider Transactions Trends

Date	Buy	Sell
2025 Q4	-	3
2025 Q3	-	7
2025 Q2	-	6
2025 Q1	-	34
2024 Q4	-	23

ACLX Ownership FAQ

Who Owns Arcellx?

Arcellx shareholders are primarily institutional investors at 109.16%, followed by 14.43% insiders and -23.59% retail investors. The average institutional ownership in Arcellx's industry, Biotech Stocks , is 307.10%, which Arcellx falls below.

Who owns the most shares of Arcellx?

Arcellx’s largest shareholders are Fmr (7.96M shares, 14.78%), Gilead sciences (6.72M shares, 12.49%), and Paradigm biocapital advisors lp (4.37M shares, 8.12%). Together, they hold 35.39% of Arcellx’s total shares outstanding.

Does Blackrock own Arcellx?

Yes, BlackRock owns 6.67% of Arcellx, totaling 3.52M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 194.07M$. In the last quarter, BlackRock increased its holdings by 450.3K shares, a 14.69% change.

Who is Arcellx’s biggest shareholder by percentage of total assets invested?

Aju ib investment is Arcellx’s biggest shareholder by percentage of total assets invested, with 75.07% of its assets in 1.05M Arcellx shares, valued at 68.98M$.

Who is the top mutual fund holder of Arcellx shares?

Vanguard Total Stock Mkt Idx Inv is the top mutual fund holder of Arcellx shares, with 3.13% of its total shares outstanding invested in 1.74M Arcellx shares.

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