Rubric Capital Management LP
Position in PRTA — Prothena Corp Public Ltd Co
CIK 1687509
NEW YORK, NY
Position in PRTA
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$48,950,000
+$350,000 QoQ
Shares Held
5,000,000
0.0% QoQ
Ownership
9.74%
of shares outstanding
% of Portfolio
0.45%
of 13F equity value
Holder Rank
#2
of 187 holders
Holding Since
Sep 2025
4 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in PRTA Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026Rubric Capital Management LP holds $1,431,610,576 across 20 Biotechnology names. PRTA ranks #10 (3.4% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ARQT |
Arcutis Biotherapeutics, Inc.
|
8,271,577 | $216,880,748 | |
| 2 | ROIV |
Roivant Sciences Ltd.
|
6,000,000 | $212,340,000 | |
| 3 | ZYME |
Zymeworks Inc.
|
7,000,000 | $182,980,000 | |
| 4 | NRIX |
Nurix Therapeutics, Inc.
|
7,227,778 | $175,345,894 | |
| 5 | MGTX |
MeiraGTx Holdings plc
|
9,100,000 | $122,941,000 | |
| 6 | ARDX |
Ardelyx, Inc.
|
16,202,700 | $82,633,770 | |
| 7 | ADMA |
Adma Biologics, Inc.
|
9,339,414 | $78,170,895 | |
| 8 | MNKD |
Mannkind Corp
|
18,000,000 | $76,680,000 |
All Filings in PRTA
Export CSV
4 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $48,950,000 | 5,000,000 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $48,600,000 | 5,000,000 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $35,118,511 | 3,677,331 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $15,034,040 | 1,540,373 | Shares | Sole | 2025-11-14 | |
| No filing history on record for this holder in this stock. | ||||||