Position in OBIO
as of Jun 30, 2026
· filed Aug 14, 2026
Position Value
$41,234,411
+$5,933,644 QoQ
Shares Held
9,556,063
+15.0% QoQ
Ownership
15.9%
of shares outstanding
% of Portfolio
0.35%
of 13F equity value
Holder Rank
#1
of 77 holders
Holding Since
Sep 2022
16 quarters on record
Voting authority
Sole 100%
Shared 0%
None 0%
Common Shares in OBIO 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. OBIO ranks #37 (0.4% 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 OBIO
Export CSV
20 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $41,234,411 | 9,556,063 | Shares | Sole | 2026-08-14 | |
| 2026-04-27 | $48,963,815 | 11,942,394 | Shares | Sole | 2026-04-29 | |
| 2026-03-31 | $35,300,767 | 8,306,063 | Shares | Sole | 2026-05-15 | |
| 2026-02-23 | $48,127,976 | 11,942,426 | Shares | Sole | 2026-02-25 | |
| 2025-12-31 | $34,470,161 | 8,306,063 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $20,599,036 | 8,306,063 | Shares | Sole | 2025-11-14 | |
| 2025-08-04 | $22,260,248 | 8,306,063 | Shares | Sole | 2025-08-06 | |
| 2025-06-30 | $22,260,246 | 8,306,062 | Shares | Sole | 2025-08-14 | |
| 2025-04-29 | $21,014,339 | 8,306,063 | Shares | Sole | 2025-05-01 | |
| 2025-03-31 | $35,122,373 | 8,206,162 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $32,824,648 | 8,206,162 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $42,179,657 | 8,206,159 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $45,808,216 | 5,620,640 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $29,620,772 | 5,620,640 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $51,316,443 | 5,620,640 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $49,011,980 | 5,620,640 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $39,344,480 | 5,620,640 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $100,169,181 | 5,118,507 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 HSAQ | — | 1,000,000 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 HSAQ | — | 1,000,000 | Shares | Sole | 2022-11-14 | |
| No filing history on record for this holder in this stock. | ||||||