Position in RARE
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$76,442,255
+$7,439,058 QoQ
Shares Held
3,648,795
+21.6% QoQ
Ownership
3.70%
of shares outstanding
% of Portfolio
0.76%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Dec 2021
18 quarters on record
Voting authority
Sole 100.ToString("F0")%
Shared 0.ToString("F0")%
None 0.ToString("F0")%
Common Shares in RARE Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026RTW INVESTMENTS, LP holds $8,256,157,304 across 64 Biotechnology names. RARE ranks #28 (0.9% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
1,993,687 | $1,043,635,333 | |
| 2 | INSM |
INSMED Inc
|
4,842,880 | $791,907,737 | |
| 3 | PTGX |
Protagonist Therapeutics, Inc
|
5,059,053 | $533,224,186 | |
| 4 | PTCT |
Ptc Therapeutics, Inc.
|
7,746,415 | $527,763,253 | |
| 5 | ARGX |
Argenx SE
|
709,446 | $518,072,941 | |
| 6 | CGON |
CG Oncology, Inc.
|
6,984,808 | $472,731,805 | |
| 7 | CELC |
Celcuity Inc.
|
3,039,621 | $346,942,340 | |
| 8 | TNGX |
Tango Therapeutics, Inc.
|
13,300,620 | $278,248,970 |
All Filings in RARE
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18 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $76,442,255 | 3,648,795 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $69,003,197 | 3,000,139 | Shares | Sole | 2026-02-17 | |
| 2025-09-30 | $98,008,641 | 3,258,266 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $62,081,136 | 1,707,402 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $61,825,026 | 1,707,402 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $82,793,844 | 1,968,002 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $109,322,511 | 1,968,002 | Shares | Sole | 2024-11-14 | |
| 2024-06-30 | $133,982,999 | 3,259,927 | Shares | Sole | 2024-08-14 | |
| 2024-03-31 | $330,897,399 | 7,087,115 | Shares | Sole | 2024-05-15 | |
| 2023-12-31 | $329,340,452 | 6,887,086 | Shares | Sole | 2024-02-14 | |
| 2023-09-30 | $192,691,422 | 5,405,089 | Shares | Sole | 2023-11-14 | |
| 2023-06-30 | $249,336,755 | 5,405,089 | Shares | Sole | 2023-08-14 | |
| 2023-03-31 | $171,266,939 | 4,270,996 | Shares | Sole | 2023-05-15 | |
| 2022-12-31 | $183,787,171 | 3,966,915 | Shares | Sole | 2023-02-14 | |
| 2022-09-30 | $97,727,434 | 2,359,996 | Shares | Sole | 2022-11-14 | |
| 2022-06-30 | $81,930,123 | 1,373,284 | Shares | Sole | 2022-08-15 | |
| 2022-03-31 | $99,727,884 | 1,373,284 | Shares | Sole | 2022-05-16 | |
| 2021-12-31 | $115,479,451 | 1,373,284 | Shares | Sole | 2022-02-14 | |
| No filing history on record for this holder in this stock. | ||||||