BLAIR WILLIAM & CO/IL

Position in ARGX — Argenx SE

CIK 902367 CHICAGO, IL

Position in ARGX

as of Mar 31, 2026 · filed May 8, 2026 Compact

Position Value

$16,362,711

-$5,787,911 QoQ

Shares Held

22,407

-14.9% QoQ

Ownership

0.036%

of shares outstanding

% of Portfolio

0.06%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 76.53858169322086.ToString("F0")% Shared 0.ToString("F0")% None 23.46141830677913.ToString("F0")%

Healthcare · as of Mar 31, 2026

BLAIR WILLIAM & CO/IL holds $126,358,113 across 56 Biotechnology names. ARGX ranks #2 (12.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	TECH	BIO-TECHNE Corp	864,329	$45,169,833
2	ARGX	Argenx SE This page	22,407	$16,362,711
3	VKTX	Viking Therapeutics, Inc.	371,119	$12,076,212
4	EXEL	Exelixis, Inc.	193,238	$8,287,977
5	VRTX	Vertex Pharmaceuticals Inc / Ma	16,541	$7,386,218
6	SLDB	Solid Biosciences Inc.	651,216	$4,688,755
7	NGNE	Neurogene Inc.	168,218	$3,391,274
8	ALNY	Alnylam Pharmaceuticals, Inc.	9,430	$3,120,104

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$16,362,711	22,407	-14.9%	Shares	Sole	2026-05-08
2025-12-31	$22,150,622	26,340	+1005.3%	Shares	Sole	2026-02-17
2025-09-30	$1,757,605	2,383	+3.2%	Shares	Sole	2025-11-12
2025-06-30	$1,273,318	2,310	+11.1%	Shares	Sole	2025-07-24
2025-03-31	$1,230,487	2,079	+127.5%	Shares	Sole	2025-05-09
2024-12-31	$562,110	914	-0.7%	Shares	Sole	2025-02-12
2024-09-30	$498,713	920	+1.0%	Shares	Sole	2024-11-12
2024-06-30	$391,766	911	-37.0%	Shares	Sole	2024-08-12
2024-03-31	$568,925	1,445	-32.5%	Shares	Sole	2024-05-09
2023-12-31	$814,120	2,140	+13.9%	Shares	Sole	2024-02-12
2023-09-30	$923,772	1,879	+9.2%	Shares	Sole	2023-11-09
2023-06-30	$670,335	1,720	+64.6%	Shares	Sole	2023-08-11
2023-03-31	$389,346	1,045	-26.4%	Shares	Sole	2023-05-12
2022-12-31	$537,938	1,420	-10.0%	Shares	Sole	2023-02-10
2022-09-30	$557,112	1,578	+0.2%	Shares	Sole	2022-11-09
2022-06-30	$596,736	1,575	0.0%	Shares	Sole	2022-08-10
2022-03-31	$496,613	1,575	-0.8%	Shares	Sole	2022-05-13
2021-12-31	$555,751	1,587	+0.8%	Shares	Sole	2022-02-14
2021-09-30	$475,650	1,575	0.0%	Shares	Sole	2021-11-12
2021-06-30	$474,185	1,575	0.0%	Shares	Sole	2021-08-12
2021-03-31	$433,739	1,575	0.0%	Shares	Sole	2021-05-13
2020-12-31	$463,191	1,575	0.0%	Shares	Sole	2021-02-09
2020-09-30	$413,469	1,575	0.0%	Shares	Sole	2020-11-06
2020-06-30	$354,737	1,575	0.0%	Shares	Sole	2020-08-12
2020-03-31	$207,474	1,575	—	Shares	Sole	2020-05-11
No filing history on record for this holder in this stock.