Company · Ownership research

ARGENX SE ARGX

CIK 0001697862 · CUSIP 04016X101

Insider tradingInitial holdingsInstitutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 04016X101 (ARGX), not CUSIP 04016X901 (ARGX), CUSIP 04016X951 (ARGX), CUSIP N0610Q109 (ARGNF), and does not merge CUSIPs.

This page lists the top 20 of 509 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	FMR LLC CIK 315066 · View history	$4.70B 5,592,319 shares	0.24%	-100.03K(-1.80%)Reduced	SEC filing ↗ Feb 17, 2026	▾
02	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$2.83B 3,362,324 shares	0.30%	-278.08K(-7.60%)Reduced	SEC filing ↗ Feb 17, 2026	▾
03	JANUS HENDERSON GROUP PLC CIK 1274173 · View history	$2.06B 2,458,164 shares	0.92%	-117.09K(-4.50%)Reduced	SEC filing ↗ Feb 17, 2026	▾
04	Capital World Investors CIK 1422849 · View history	$1.61B 1,916,234 shares	0.22%	-43.27K(-2.20%)Reduced	SEC filing ↗ Feb 11, 2026	▾
05	Artisan Partners Limited Partnership CIK 1466153 · View history	$1.48B 1,756,942 shares	2.26%	-429.57K(-19.60%)Reduced	SEC filing ↗ Feb 17, 2026	▾
06	Avoro Capital Advisors LLC CIK 1633313 · Amended · View history	$832.54M 990,000 shares	8.18%	0(0.00%)Unchanged	SEC filing ↗ Mar 16, 2026	▾
07	BlackRock, Inc. CIK 2012383 · View history	$618.60M 735,598 shares	0.01%	+211.80K(+40.40%)Added	SEC filing ↗ Feb 12, 2026	▾
08	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$571.20M 679,236 shares	0.10%	-50.75K(-7.00%)Reduced	SEC filing ↗ Feb 17, 2026	▾
09	RTW INVESTMENTS, LP CIK 1493215 · View history	$566.38M 673,497 shares	5.67%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
10	MORGAN STANLEY CIK 895421 · Amended · View history	$436.33M 518,852 shares	0.03%	+83.75K(+19.20%)Added	SEC filing ↗ May 27, 2026	▾
11	Clearbridge Investments, LLC CIK 1348883 · View history	$432.05M 513,764 shares	0.35%	-243.10K(-32.10%)Reduced	SEC filing ↗ Feb 11, 2026	▾
12	Bellevue Group AG CIK 1674546 · View history	$388.40M 461,854 shares	7.36%	-84.47K(-15.50%)Reduced	SEC filing ↗ Feb 17, 2026	▾
13	Invesco Ltd. CIK 914208 · Amended · View history	$350.18M 416,408 shares	0.03%	+331.49K(+390.40%)Added	SEC filing ↗ Feb 19, 2026	▾
14	ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history	$348.31M 414,182 shares	0.11%	+329.43K(+388.70%)Added	SEC filing ↗ Feb 17, 2026	▾
15	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$337.03M 400,776 shares	0.02%	+58.40K(+17.10%)Added	SEC filing ↗ Feb 17, 2026	▾
16	SANDS CAPITAL MANAGEMENT, LLC CIK 1020066 · View history	$300.11M 356,870 shares	0.91%	+340.25K(+2,046.60%)Added	SEC filing ↗ Feb 13, 2026	▾
17	CITADEL ADVISORS LLC CIK 1423053 · View history	$295.05M 350,851 shares	0.20%	-362.71K(-50.80%)Reduced	SEC filing ↗ Feb 17, 2026	▾
18	SEI INVESTMENTS CO CIK 350894 · View history	$277.94M 330,506 shares	0.27%	+18.24K(+5.80%)Added	SEC filing ↗ Feb 13, 2026	▾
19	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$217.43M 258,556 shares	0.32%	-35.60K(-12.10%)Reduced	SEC filing ↗ Feb 17, 2026	▾
20	FRANKLIN RESOURCES INC CIK 38777 · View history	$199.90M 237,701 shares	0.05%	-20.57K(-8.00%)Reduced	SEC filing ↗ Feb 11, 2026	▾

Showing 20 / 509 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

509

Cancelled or null records excluded

Disclosed shares

29,748,387

Not deduplicated across managers

Disclosed value

$25.00B

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.

ARGENX SE · Q4 2025

Explore all 509 reporting institutions.

This page includes 20 of 509 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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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.