Position in ZLAB
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$124,906,608
+$1,249,067 QoQ
Shares Held
6,574,032
0.0% QoQ
Ownership
5.86%
of shares outstanding
% of Portfolio
1.07%
of 13F equity value
Holder Rank
#1
of 92 holders
Holding Since
Dec 2024
7 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in ZLAB Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026RTW INVESTMENTS, LP holds $9,530,420,260 across 63 Biotechnology names. ZLAB ranks #23 (1.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
1,993,687 | $1,070,510,234 | |
| 2 | ARGX |
Argenx SE
|
709,446 | $658,202,715 | |
| 3 | PTCT |
Ptc Therapeutics, Inc.
|
7,746,415 | $631,875,071 | |
| 4 | PTGX |
Protagonist Therapeutics, Inc
|
5,061,175 | $620,398,831 | |
| 5 | CGON |
CG Oncology, Inc.
|
8,514,590 | $604,961,619 | |
| 6 | INSM |
INSMED Inc
|
4,842,880 | $516,347,865 | |
| 7 | TNGX |
Tango Therapeutics, Inc.
|
13,900,620 | $434,533,381 | |
| 8 | SYRE |
Spyre Therapeutics, Inc.
|
4,251,996 | $377,492,204 |
All Filings in ZLAB
Export CSV
7 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $124,906,608 | 6,574,032 | Shares | Sole | 2026-08-14 | |
| 2026-03-31 | $123,657,541 | 6,574,032 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $122,757,324 | 6,959,032 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $77,654,597 | 2,291,372 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $193,624,553 | 5,536,876 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $113,359,615 | 3,136,680 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $65,713,826 | 2,509,119 | Shares | Sole | 2025-02-14 | |
| No filing history on record for this holder in this stock. | ||||||