Arcellx Ownership | Who Owns Arcellx?

Overview Forecast RevenueFinancials Chart

Arcellx Ownership Summary

Arcellx is owned by 111.41% institutional investors, 2.29% 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 3.20% of its assets in Arcellx shares.

ACLX Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Arcellx	111.41%	2.29%	-13.69%
Sector	Healthcare Stocks	279.19%	10.62%	-189.81%
Industry	Biotech Stocks	63.96%	10.74%	25.30%

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 funding, inc. /de	3.85M	7.16%	$295.56M
Nea management company	3.75M	6.96%	$287.22M
Blackrock	3.52M	6.67%	$194.07M
Perceptive advisors	3.48M	6.46%	$266.80M
Vanguard group	3.33M	6.19%	$255.38M
Ra capital management	2.79M	5.18%	$213.76M
Sr one capital management, lp	2.35M	4.36%	$179.96M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Sr one capital management, lp	2.35M	43.88%	$179.96M
Gilead sciences	6.72M	33.23%	$515.42M
Nea management company	3.75M	16.21%	$287.22M
Paradigm biocapital advisors lp	4.37M	11.66%	$335.26M
Perceptive advisors	3.48M	7.35%	$266.80M
Artia global partners lp	229.78K	6.30%	$17.62M
Cormorant asset management, lp	1.30M	5.48%	$99.70M
Great point partners	492.00K	5.20%	$27.15M
Affinity asset advisors	425.00K	4.37%	$32.59M
Ra capital management	2.79M	2.84%	$213.76M

Top Buyers

Holder	Shares	% Assets	Change
Gilead sciences	6.72M	33.23%	6.72M
Fmr	7.96M	0.04%	1.48M
Ra capital management	2.79M	2.84%	935.85K
Vanguard group	3.33M	0.00%	868.00K
Blackrock	3.52M	0.00%	450.30K

Top Sellers

Holder	Shares	% Assets	Change
Suvretta capital management	-	-	-689.95K
Janus henderson group	1.56M	0.06%	-454.86K
Perceptive advisors	3.48M	7.35%	-409.78K
Blackrock funding, inc. /de	3.85M	0.01%	-392.67K
Adage capital partners gp	-	-	-292.01K

New Positions

Holder	Shares	% Assets	Change	Value
Gilead sciences	6.72M	33.23%	6.72M	$515.42M
Capital world investors	252.88K	0.00%	252.88K	$19.39M
Artia global partners lp	229.78K	6.30%	229.78K	$17.62M
Raymond james financial	130.60K	0.00%	130.60K	$10.02M
Jacobs levy equity management	47.82K	0.01%	47.82K	$2.64M

Sold Out

Holder	Change
Quantbot technologies lp	-1.00
Ifp advisors	-2.00
Ronald blue trust	-11.00
Global retirement partners	-12.00
Nelson, van denburg & campbell wealth management group	-19.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
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%
Mar 31, 2024	184	12.20%	46,986,953	0.53%	89	0.97%	108	11.34%	58	20.83%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard Total Stock Mkt Idx Inv	1.76M	3.20%	18.66K
iShares Russell 2000 ETF	1.12M	2.03%	549.00
Fidelity Select Biotechnology	805.29K	1.46%	-
Fidelity Growth Compy Commingled Pl O	764.28K	1.42%	-
T. Rowe Price Health Sciences	722.84K	1.32%	-120.95K
American Funds SMALLCAP World A	709.37K	1.29%	456.50K
Vanguard Small Cap Index	690.04K	1.25%	3.13K
SPDR® S&P Biotech ETF	660.21K	1.20%	852.00
Fidelity Small Cap Growth	643.33K	1.17%	-
Fidelity Growth Compy Commingled Pl S	601.12K	1.09%	-96.10K

Recent Insider Transactions

Date	Name	Role	Activity	Value
Jun 10, 2025	Patel Kavita	-	Sell	$101.04K
May 27, 2025	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$543.91K
May 27, 2025	Gilson Michelle	CHIEF FINANCIAL OFFICER	Sell	$240.87K
May 20, 2025	Patel Kavita	-	Sell	$87.64K
Apr 29, 2025	Patel Kavita	-	Sell	$96.30K

Insider Transactions Trends

Date	Buy	Sell
2025 Q2	-	6
2025 Q1	-	34
2024 Q4	-	23
2024 Q3	-	24
2024 Q2	-	16

ACLX Ownership FAQ

Who Owns Arcellx?

Arcellx shareholders are primarily institutional investors at 111.41%, followed by 2.29% insiders and -13.70% retail investors. The average institutional ownership in Arcellx's industry, Biotech Stocks , is 63.96%, which Arcellx exceeds.

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?

Sr one capital management, lp is Arcellx’s biggest shareholder by percentage of total assets invested, with 43.88% of its assets in 2.35M Arcellx shares, valued at 179.96M$.

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 3.20% of its total shares outstanding invested in 1.76M Arcellx shares.

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