WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in PTCT — Ptc Therapeutics, Inc.
CIK 1644956
CHICAGO, IL
Position in PTCT
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$140,519,660
New position
Shares Held
1,722,688
first reported quarter
Ownership
2.06%
of shares outstanding
% of Portfolio
0.43%
of 13F equity value
Holder Rank
#12
of 380 holders
Holding Since
Jun 2026
1 quarter on record
Voting authority
Sole 92%
Shared 0%
None 8%
Position in Biotechnology
Healthcare · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,561,504,374 across 14 Biotechnology names. PTCT ranks #6 (9.0% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ARGX |
Argenx SE
|
264,617 | $245,503,714 | |
| 2 | KRYS |
Krystal Biotech, Inc.
|
570,153 | $211,908,765 | |
| 3 | HALO |
Halozyme Therapeutics, Inc.
|
2,511,050 | $196,539,883 | |
| 4 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
324,123 | $174,037,844 | |
| 5 | MIRM |
Mirum Pharmaceuticals, Inc.
|
1,404,741 | $164,453,028 | |
| 6 | PTCT |
Ptc Therapeutics, Inc.
This page
|
1,722,688 | $140,519,660 | |
| 7 | CYTK |
Cytokinetics Inc
|
1,603,442 | $136,597,223 | |
| 8 | JAZZ |
Jazz Pharmaceuticals plc
|
436,893 | $105,278,106 |
All Filings in PTCT
Export CSV
1 filing row on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $140,519,660 | 1,722,688 | Shares | Sole | 2026-08-12 | |
| No filing history on record for this holder in this stock. | ||||||