Position in ARGX
as of Mar 31, 2026
· filed May 8, 2026
Position Value
$194,295,426
+$6,203,504 QoQ
Shares Held
266,067
+19.0% QoQ
Ownership
0.428%
of shares outstanding
% of Portfolio
0.65%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2025
2 quarters on record
Voting authority
Sole 82.03460030744137.ToString("F0")%
Shared 0.ToString("F0")%
None 17.96539969255864.ToString("F0")%
Common Shares in ARGX Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,135,241,101 across 13 Biotechnology names. ARGX ranks #1 (17.1% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ARGX |
Argenx SE
This page
|
266,067 | $194,295,426 | |
| 2 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
340,519 | $178,251,480 | |
| 3 | HALO |
Halozyme Therapeutics, Inc.
|
2,525,975 | $163,253,764 | |
| 4 | INSM |
INSMED Inc
|
902,666 | $147,603,944 | |
| 5 | TECH |
BIO-TECHNE Corp
|
2,462,487 | $128,689,570 | |
| 6 | KRYS |
Krystal Biotech, Inc.
|
407,178 | $105,182,220 | |
| 7 | CYTK |
Cytokinetics Inc
|
1,087,591 | $71,683,122 | |
| 8 | VCEL |
Vericel Corp
|
1,832,709 | $58,958,248 |
All Filings in ARGX
Export CSV
2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $194,295,426 | 266,067 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $188,091,922 | 223,666 | Shares | Sole | 2026-02-09 | |
| No filing history on record for this holder in this stock. | ||||||