Company · Ownership research

Arcellx, Inc. ACLX

CIK 0001786205 · CUSIP 03940C100

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 03940C100, not CUSIP 03940C900, CUSIP 03940C950, and does not merge CUSIPs.

This page lists the top 20 of 200 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	GILEAD SCIENCES, INC. CIK 882095 · View history	$440.88M 6,720,803 shares	37.32%	0(0.00%)Unchanged	SEC filing ↗ May 13, 2025	▾
02	FMR LLC CIK 315066 · View history	$413.52M 6,303,679 shares	0.03%	-1.65M(-20.80%)Reduced	SEC filing ↗ May 12, 2025	▾
03	Paradigm Biocapital Advisors LP CIK 1855655 · View history	$294.68M 4,492,032 shares	13.56%	+120.43K(+2.80%)Added	SEC filing ↗ May 15, 2025	▾
04	VANGUARD GROUP INC CIK 102909 · View history	$261.43M 3,985,156 shares	0.00%	+655.06K(+19.70%)Added	SEC filing ↗ May 9, 2025	▾
05	BlackRock, Inc. CIK 2012383 · View history	$260.27M 3,967,569 shares	0.01%	+113.55K(+2.90%)Added	SEC filing ↗ May 2, 2025	▾
06	NEA Management Company, LLC CIK 1512848 · View history	$245.69M 3,745,262 shares	18.92%	0(0.00%)Unchanged	SEC filing ↗ May 14, 2025	▾
07	RA CAPITAL MANAGEMENT, L.P. CIK 1346824 · View history	$199.20M 3,036,527 shares	3.33%	+249.20K(+8.90%)Added	SEC filing ↗ May 15, 2025	▾
08	PERCEPTIVE ADVISORS LLC CIK 1224962 · Amended · View history	$191.98M 2,926,478 shares	6.81%	-552.41K(-15.90%)Reduced	SEC filing ↗ Aug 6, 2025	▾
09	Vestal Point Capital, LP CIK 1974915 · View history	$156.63M 2,387,720 shares	11.19%	+1.91M(+402.70%)Added	SEC filing ↗ May 15, 2025	▾
10	SR One Capital Management, LP CIK 1910264 · View history	$153.94M 2,346,630 shares	39.54%	0(0.00%)Unchanged	SEC filing ↗ May 13, 2025	▾
11	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$120.68M 1,839,624 shares	0.01%	-281.70K(-13.30%)Reduced	SEC filing ↗ May 14, 2025	▾
12	STATE STREET CORP CIK 93751 · View history	$109.32M 1,666,451 shares	0.00%	-108.92K(-6.10%)Reduced	SEC filing ↗ May 15, 2025	▾
13	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$109.23M 1,665,138 shares	0.07%	+959.22K(+135.90%)Added	SEC filing ↗ May 14, 2025	▾
14	JANUS HENDERSON GROUP PLC CIK 1274173 · View history	$102.64M 1,510,494 shares	0.06%	-46.60K(-3.00%)Reduced	SEC filing ↗ May 15, 2025	▾
15	Cormorant Asset Management, LP CIK 1583977 · View history	$68.88M 1,050,000 shares	5.22%	-250.00K(-19.20%)Reduced	SEC filing ↗ May 15, 2025	▾
16	AJU IB Investment Co., Ltd. CIK 1710065 · View history	$68.72M 1,047,557 shares	81.77%	0(0.00%)Unchanged	SEC filing ↗ Apr 8, 2025	▾
17	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$66.96M 1,020,540 shares	0.01%	+41.51K(+4.20%)Added	SEC filing ↗ May 13, 2025	▾
18	CITADEL ADVISORS LLC CIK 1423053 · View history	$47.63M 726,127 shares	0.05%	+700.90K(+2,778.50%)Added	SEC filing ↗ May 15, 2025	▾
19	Capital World Investors CIK 1422849 · View history	$46.53M 709,374 shares	0.01%	+456.50K(+180.50%)Added	SEC filing ↗ May 12, 2025	▾
20	JPMORGAN CHASE & CO CIK 19617 · View history	$44.84M 683,581 shares	0.00%	+459.13K(+204.60%)Added	SEC filing ↗ May 12, 2025	▾

Showing 20 / 200 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

200

Cancelled or null records excluded

Disclosed shares

61,580,372

Not deduplicated across managers

Disclosed value

$4.04B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Arcellx, Inc. · Q1 2025

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.