Insmed Inc (INSM)
Who owns Insmed Inc (INSM)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 91.5% of the shares are freely tradable; institutional investors hold 105.7%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| JPMorgan Chase & Co | 11.14 | 24,150,499 | +4.1 | 03/31/2026 |
| Vanguard Group Inc | 9.72 | 21,076,344 | +5.7 | 12/31/2025 |
| Darwin Global Management, Ltd. | 7.75 | 16,805,184 | -19.7 | 03/31/2026 |
| BlackRock Inc | 7.69 | 16,678,146 | +10.7 | 03/31/2026 |
| FMR Inc | 6.07 | 13,160,167 | +32.6 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 4.79 | 10,371,802 | +0.0 | 03/31/2026 |
| Vanguard Capital Management, LLC | 4.45 | 9,642,131 | +0.0 | 03/31/2026 |
| Baker Bros Advisors LP | 3.42 | 7,421,111 | +12.6 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| JPMorgan Large Cap Growth I | 4.91 | 10,633,939 | +0.0 | 04/30/2026 |
| Vanguard Total Stock Mkt Idx Inv | 3.17 | 6,869,252 | +0.2 | 04/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 6. Jul 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 7,448 | 110.60 | 823,749 |
| 6. Jul 2026 | Flammer Martina M.D. | Chief Medical Officer | Sell | 4,854 | 109.02 | 529,183 |
| 6. Jul 2026 | Flammer Martina M.D. | Chief Medical Officer | Other | 4,357 | 19.74 | 86,007 |
| 6. Jul 2026 | Flammer Martina M.D. | Chief Medical Officer | Other | 7,945 | 29.13 | 231,438 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.