Position in PTCT
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$6,259,784
-$1,097,701 QoQ
Shares Held
91,880
-5.1% QoQ
Ownership
0.111%
of shares outstanding
% of Portfolio
0.24%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2025
2 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in PTCT Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026CASTLEARK MANAGEMENT LLC holds $80,833,875 across 14 Biotechnology names. PTCT ranks #6 (7.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ASND |
Ascendis Pharma A/S
|
67,616 | $15,465,807 | |
| 2 | LGND |
Ligand Pharmaceuticals Inc
|
48,696 | $9,722,156 | |
| 3 | JAZZ |
Jazz Pharmaceuticals plc
|
48,740 | $9,214,297 | |
| 4 | KRYS |
Krystal Biotech, Inc.
|
31,630 | $8,170,661 | |
| 5 | ARQT |
Arcutis Biotherapeutics, Inc.
|
293,460 | $6,913,917 | |
| 6 | PTCT |
Ptc Therapeutics, Inc.
This page
|
91,880 | $6,259,784 | |
| 7 | BBIO |
BridgeBio Pharma, Inc.
|
81,737 | $6,069,789 | |
| 8 | RYTM |
Rhythm Pharmaceuticals, Inc.
|
52,279 | $4,546,704 |
All Filings in PTCT
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2 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $6,259,784 | 91,880 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $7,357,485 | 96,860 | Shares | Sole | 2026-02-13 | |
| No filing history on record for this holder in this stock. | ||||||