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 477 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	$3.64B 4,991,034 shares	0.19%	-601.28K(-10.80%)Reduced	SEC filing ↗ May 15, 2026	▾
02	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$2.46B 3,374,955 shares	0.28%	+12.63K(+0.40%)Added	SEC filing ↗ May 15, 2026	▾
03	JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history	$1.85B 2,541,732 shares	0.88%	+83.57K(+3.40%)Added	SEC filing ↗ May 18, 2026	▾
04	Capital World Investors CIK 1422849 · View history	$1.65B 2,256,216 shares	0.22%	+339.98K(+17.70%)Added	SEC filing ↗ May 13, 2026	▾
05	Artisan Partners Limited Partnership CIK 1466153 · View history	$1.07B 1,467,982 shares	1.75%	-288.96K(-16.40%)Reduced	SEC filing ↗ May 13, 2026	▾
06	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$745.92M 1,021,457 shares	0.14%	+342.22K(+50.40%)Added	SEC filing ↗ May 15, 2026	▾
07	Avoro Capital Advisors LLC CIK 1633313 · View history	$730.25M 1,000,000 shares	7.19%	+10.00K(+1.00%)Added	SEC filing ↗ May 15, 2026	▾
08	BlackRock, Inc. CIK 2012383 · View history	$590.29M 808,337 shares	0.01%	+72.74K(+9.90%)Added	SEC filing ↗ May 13, 2026	▾
09	RTW INVESTMENTS, LP CIK 1493215 · View history	$518.07M 709,446 shares	5.16%	+35.95K(+5.30%)Added	SEC filing ↗ May 15, 2026	▾
10	Invesco Ltd. CIK 914208 · Amended · View history	$434.28M 594,697 shares	0.04%	+178.29K(+42.80%)Added	SEC filing ↗ May 12, 2026	▾
11	MORGAN STANLEY CIK 895421 · View history	$409.46M 560,711 shares	0.02%	+41.86K(+8.10%)Added	SEC filing ↗ May 15, 2026	▾
12	ALLIANCEBERNSTEIN L.P. CIK 1109448 · View history	$355.14M 422,304 shares	0.12%	+8.12K(+2.00%)Added	SEC filing ↗ May 15, 2026	▾
13	BANK OF AMERICA CORP /DE/ CIK 70858 · View history	$292.19M 400,117 shares	0.02%	-659(-0.20%)Reduced	SEC filing ↗ May 18, 2026	▾
14	SANDS CAPITAL MANAGEMENT, LLC CIK 1020066 · View history	$248.49M 340,285 shares	0.97%	-16.59K(-4.60%)Reduced	SEC filing ↗ May 8, 2026	▾
15	Bellevue Group AG CIK 1674546 · View history	$228.57M 313,000 shares	5.44%	-148.85K(-32.20%)Reduced	SEC filing ↗ May 15, 2026	▾
16	SEI INVESTMENTS CO CIK 350894 · View history	$209.56M 286,966 shares	0.19%	-43.54K(-13.20%)Reduced	SEC filing ↗ May 13, 2026	▾
17	WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC CIK 1644956 · View history	$194.36M 266,067 shares	0.64%	+42.40K(+19.00%)Added	SEC filing ↗ May 8, 2026	▾
18	JENNISON ASSOCIATES LLC CIK 53417 · View history	$173.41M 237,468 shares	0.12%	+7.71K(+3.40%)Added	SEC filing ↗ May 6, 2026	▾
19	FRANKLIN RESOURCES INC CIK 38777 · View history	$170.51M 233,493 shares	0.04%	-4.21K(-1.80%)Reduced	SEC filing ↗ May 13, 2026	▾
20	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$169.41M 231,985 shares	0.02%	+64.78K(+38.70%)Added	SEC filing ↗ May 15, 2026	▾

Showing 20 / 477 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

477

Cancelled or null records excluded

Disclosed shares

28,815,747

Not deduplicated across managers

Disclosed value

$21.08B

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 · Q1 2026

Explore all 477 reporting institutions.

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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.