Arcellx Ownership | Who Owns Arcellx?

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Arcellx Ownership Summary

Arcellx is owned by 83.17% institutional investors, 11.67% insiders, and 5.16% retail investors. Gilead sciences is the largest institutional shareholder, holding 11.94% of ACLX shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 3.16% of its assets in Arcellx shares.

ACLX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Arcellx	83.17%	11.67%	5.16%
Sector	Healthcare Stocks	35.58%	11.87%	52.55%
Industry	Biotech Stocks	35.80%	11.85%	52.35%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Gilead sciences	6.72M	11.94%	$771.68M
Paradigm biocapital advisors lp	5.77M	10.25%	$662.97M
Vanguard group	4.08M	7.21%	$266.12M
Blackrock funding, inc. /de	3.95M	7.01%	$452.99M
Blackrock	3.52M	6.67%	$194.07M
Nea management company	3.05M	5.41%	$349.66M
Pentwater capital management lp	2.87M	5.10%	$329.53M
Sr one capital management, lp	2.35M	4.17%	$269.44M
Fil	2.34M	4.15%	$268.59M
Hbk investments l p	2.28M	4.05%	$261.62M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Aju ib investment	223.49K	84.07%	$25.66M
Gilead sciences	6.72M	36.44%	$771.68M
Sr one capital management, lp	2.35M	29.43%	$269.44M
Nea management company	3.05M	19.88%	$349.66M
Paradigm biocapital advisors lp	5.77M	13.55%	$662.97M
Chicago capital management	92.95K	6.66%	$8.04M
Cibra capital	88.62K	4.91%	$10.18M
Cormorant asset management, lp	775.00K	4.39%	$63.63M
Fifth lane capital, lp	31.04K	4.33%	$3.56M
Slotnik capital	118.00K	3.96%	$13.55M

Top Buyers

Holder	Shares	% Assets	Change
Pentwater capital management lp	2.87M	1.71%	2.87M
Fil	2.34M	0.21%	2.34M
Hbk investments l p	2.28M	2.65%	2.28M
Glazer capital	1.51M	3.67%	1.51M
Goldman sachs group	1.31M	0.02%	643.67K

Top Sellers

Holder	Shares	% Assets	Change
T. rowe price investment management	2.26M	0.18%	-8.30M
Fmr	119.38K	0.00%	-3.44M
Vestal point capital, lp	-	-	-2.92M
Price t rowe associates inc /md/	45.95K	0.00%	-1.56M
Citadel advisors	21.81K	0.00%	-1.48M

New Positions

Holder	Shares	% Assets	Change	Value
Pentwater capital management lp	2.87M	1.71%	2.87M	$329.53M
Fil	2.34M	0.21%	2.34M	$268.59M
Hbk investments l p	2.28M	2.65%	2.28M	$261.62M
Glazer capital	1.51M	3.67%	1.51M	$173.05M
Davidson kempner capital management lp	559.64K	0.88%	559.64K	$64.26M

Sold Out

Holder	Change
Dunhill financial	-1.00
Massmutual trust co fsb/adv	-1.00
Principal securities	-3.00
Td capital management	-5.00
Rise advisors	-7.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	224	-2.18%	46,828,626	-29.71%	83	0.60%	134	15.52%	51	-25.00%
Dec 31, 2025	54	-75.34%	5,428,377	-91.39%	9	0.08%	27	-68.97%	17	-79.52%
Sep 30, 2025	71	-66.35%	7,468,701	-87.83%	13	0.11%	31	-66.67%	27	-67.47%
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%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	1.85M	3.16%	-15.80K
T. Rowe Price Capital Appreciation	1.38M	2.36%	-1.38M
Vanguard Small Cap Index	1.35M	2.31%	693.89K
T. Rowe Price US Mid-Cap Growth Equity	1.21M	2.07%	428.90K
T. Rowe Price Mid-Cap Growth	1.21M	2.06%	-1.00K
Fidelity Canadian Large Cap Sr B	1.15M	1.97%	552.00K
iShares Russell 2000 ETF	936.94K	1.60%	-
T. Rowe Price US Small-Cap Core Equity	917.84K	1.57%	200.31K
T. Rowe Price Small-Cap Stock	916.45K	1.57%	-1.39K
Fidelity Growth Compy Commingled Pl O	764.28K	1.42%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Feb 27, 2026	Elghandour Rami	SEE REMARKS	Sell	$10.24M
Feb 25, 2026	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$1.28M
Feb 19, 2026	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$194.99K
Feb 19, 2026	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$370.63K
Feb 19, 2026	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$6.94K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	-
2026 Q1	-	11
2025 Q4	-	4
2025 Q3	-	7
2025 Q2	-	6

ACLX Ownership FAQ

Who Owns Arcellx?

Arcellx shareholders are primarily institutional investors at 83.17%, followed by 11.67% insiders and 5.16% retail investors. The average institutional ownership in Arcellx's industry, Biotech Stocks , is 35.80%, which Arcellx exceeds.

Who owns the most shares of Arcellx?

Arcellx’s largest shareholders are Gilead sciences (6.72M shares, 11.94%), Paradigm biocapital advisors lp (5.77M shares, 10.25%), and Vanguard group (4.08M shares, 7.21%). Together, they hold 29.40% 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 84.07% of its assets in 223.49K Arcellx shares, valued at 25.66M$.

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 3.16% of its total shares outstanding invested in 1.85M Arcellx shares.

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