Position in INSM
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$67,152,581
-$80,451,363 QoQ
Shares Held
629,831
-30.2% QoQ
Ownership
0.288%
of shares outstanding
% of Portfolio
0.20%
of 13F equity value
Holder Rank
#64
of 665 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 98%
Shared 0%
None 2%
Common Shares in INSM Over Time
Shares Held
Position Value (USD)
Position in Biotechnology
Healthcare · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $1,561,504,374 across 14 Biotechnology names. INSM ranks #10 (4.3% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | ARGX |
Argenx SE
|
264,617 | $245,503,714 | |
| 2 | KRYS |
Krystal Biotech, Inc.
|
570,153 | $211,908,765 | |
| 3 | HALO |
Halozyme Therapeutics, Inc.
|
2,511,050 | $196,539,883 | |
| 4 | MDGL |
Madrigal Pharmaceuticals, Inc.
|
324,123 | $174,037,844 | |
| 5 | MIRM |
Mirum Pharmaceuticals, Inc.
|
1,404,741 | $164,453,028 | |
| 6 | PTCT |
Ptc Therapeutics, Inc.
|
1,722,688 | $140,519,660 | |
| 7 | CYTK |
Cytokinetics Inc
|
1,603,442 | $136,597,223 | |
| 8 | JAZZ |
Jazz Pharmaceuticals plc
|
436,893 | $105,278,106 |
All Filings in INSM
Export CSV
26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $67,152,581 | 629,831 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $147,603,944 | 902,666 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $212,519,547 | 1,221,096 | Shares | Sole | 2026-02-09 | |
| 2025-09-30 | $223,943,758 | 1,555,057 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $167,626,185 | 1,665,602 | Shares | Sole | 2025-07-29 | |
| 2025-03-31 | $176,475,324 | 2,313,217 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $168,004,904 | 2,433,443 | Shares | Sole | 2025-02-10 | |
| 2024-09-30 | $176,726,284 | 2,420,908 | Shares | Sole | 2024-11-08 | |
| 2024-06-30 | $232,471,776 | 3,469,728 | Shares | Sole | 2024-08-08 | |
| 2024-03-31 | $114,345,326 | 4,214,719 | Shares | Sole | 2024-05-08 | |
| 2023-12-31 | $131,914,730 | 4,256,687 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $107,108,858 | 4,241,935 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $90,432,890 | 4,285,919 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $63,198,859 | 3,706,678 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $67,735,496 | 3,390,165 | Shares | Sole | 2023-02-09 | |
| 2022-09-30 | $76,608,819 | 3,556,584 | Shares | Sole | 2022-11-09 | |
| 2022-06-30 | $69,554,195 | 3,527,089 | Shares | Sole | 2022-08-10 | |
| 2022-03-31 | $84,497,211 | 3,595,626 | Shares | Sole | 2022-05-11 | |
| 2021-12-31 | $133,861,173 | 4,914,140 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $137,040,169 | 4,976,041 | Shares | Sole | 2021-11-10 | |
| 2021-06-30 | $143,045,196 | 5,026,184 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $128,209,878 | 3,764,236 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $123,293,709 | 3,703,626 | Shares | Sole | 2021-02-09 | |
| 2020-09-30 | $76,718,051 | 2,386,996 | Shares | Sole | 2020-11-06 | |
| 2020-06-30 | $22,566,028 | 819,391 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $11,470,555 | 715,568 | Shares | Sole | 2020-05-08 | |
| No filing history on record for this holder in this stock. | ||||||