Position in INSM
as of Mar 31, 2026
· filed May 11, 2026
Position Value
$240,122,415
+$164,846,461 QoQ
Shares Held
1,468,459
+239.5% QoQ
Ownership
0.677%
of shares outstanding
% of Portfolio
1.01%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Jun 2020
12 quarters on record
Voting authority
Sole 86.028142426857.ToString("F0")%
Shared 0.ToString("F0")%
None 13.971857573143001.ToString("F0")%
Common Shares in INSM Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Mar 31, 2026WESTFIELD CAPITAL MANAGEMENT CO LP holds $2,468,245,086 across 19 Biotechnology names. INSM ranks #2 (9.7% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ASND |
Ascendis Pharma A/S
|
4,813,440 | $1,100,978,131 | |
| 2 | INSM |
INSMED Inc
This page
|
1,468,459 | $240,122,415 | |
| 3 | PCVX |
Vaxcyte, Inc.
|
3,646,138 | $211,877,079 | |
| 4 | RYTM |
Rhythm Pharmaceuticals, Inc.
|
1,929,123 | $167,775,827 | |
| 5 | RVMD |
Revolution Medicines, Inc.
|
1,556,578 | $151,377,210 | |
| 6 | ABVX |
Abivax S.A.
|
1,322,938 | $147,309,146 | |
| 7 | LEGN |
Legend Biotech Corp
|
5,763,475 | $104,261,262 | |
| 8 | XENE |
Xenon Pharmaceuticals Inc.
|
1,401,483 | $81,496,236 |
All Filings in INSM
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12 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $240,122,415 | 1,468,459 | Shares | Sole | 2026-05-11 | |
| 2025-12-31 | $75,275,954 | 432,521 | Shares | Sole | 2026-02-11 | |
| 2025-09-30 | $70,266,367 | 487,927 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $134,785,944 | 1,339,288 | Shares | Sole | 2025-08-12 | |
| 2025-03-31 | $107,310,200 | 1,406,609 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $64,797,561 | 938,551 | Shares | Sole | 2025-02-11 | |
| 2024-09-30 | $18,376,947 | 251,739 | Shares | Sole | 2024-11-12 | |
| 2021-06-30 | $27,523,068 | 967,079 | Shares | Sole | 2021-08-10 | |
| 2021-03-31 | $34,850,600 | 1,023,212 | Shares | Sole | 2021-05-14 | |
| 2020-12-31 | $42,567,124 | 1,278,676 | Shares | Sole | 2021-02-12 | |
| 2020-09-30 | $42,826,164 | 1,332,488 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $28,551,020 | 1,036,711 | Shares | Sole | 2020-08-13 | |
| No filing history on record for this holder in this stock. | ||||||