Insmed Ownership | Who Owns Insmed?
Insmed Ownership Summary
Insmed is owned by 4.68% institutional investors, 0.82% insiders, and 94.50% retail investors. Vanguard group is the largest institutional shareholder, holding 10.49% of INSM shares. Vanguard Total Stock Mkt Idx Inv is the top mutual fund, with 3.24% of its assets in Insmed shares.
INSM Ownership Benchmark
| Type | Name | % Inst | % Insiders | % Retail |
|---|---|---|---|---|
| Stock | Insmed | 4.68% | 0.82% | 94.50% |
| Sector | Healthcare Stocks | 279.15% | 10.63% | -189.78% |
Institutional Shareholders
Top Institutional Shareholders by Total Shares
| Holder | Shares | % Holding | Value |
|---|---|---|---|
| Vanguard group | 18.22M | 10.49% | $1.26B |
| Blackrock | 14.26M | 9.61% | $955.72M |
| Blackrock funding, inc. /de | 16.03M | 9.23% | $1.11B |
| Darwin global management | 15.40M | 8.51% | $1.20B |
| Price t rowe associates inc /md/ | 12.70M | 7.31% | $877.11M |
| Capital investors | 7.12M | 4.10% | $491.36M |
| State street | 4.66M | 3.14% | $312.38M |
| Baker bros. advisors lp | 5.38M | 2.98% | $410.49M |
| Fmr | 4.86M | 2.80% | $335.28M |
| Geode capital management | 4.09M | 2.35% | $282.24M |
Top Institutional Shareholders by % of Total Assets
| Holder | Shares | % Assets | Value |
|---|---|---|---|
| Darwin global management | 15.40M | 82.08% | $1.20B |
| Sio capital management | 1.36M | 24.71% | $91.30M |
| Lion point capital, lp | 30.50K | 14.84% | $2.33M |
| Palo alto investors lp | 987.15K | 14.34% | $75.31M |
| Integral health asset management | 1.55M | 12.58% | $118.25M |
| Acuta capital partners | 106.07K | 9.38% | $8.09M |
| Eagle health investments lp | 513.70K | 8.69% | $35.47M |
| Ally bridge group (ny) | 114.36K | 6.77% | $7.90M |
| Cutter capital management, lp | 186.38K | 6.19% | $14.22M |
| First turn management | 401.63K | 6.18% | $30.64M |
Top Buyers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Blackrock | 14.26M | 0.02% | 2.46M |
| Darwin global management | 15.40M | 82.08% | 2.44M |
| Norges bank | 1.83M | 0.02% | 1.83M |
| Vanguard group | 18.22M | 0.02% | 1.08M |
| Blackrock funding, inc. /de | 16.03M | 0.02% | 1.06M |
Top Sellers
| Holder | Shares | % Assets | Change |
|---|---|---|---|
| Fmr | 4.86M | 0.02% | -2.34M |
| State street | 4.66M | 0.01% | -1.24M |
| Eversept partners, lp | - | - | -1.09M |
| Viking global investors lp | - | - | -1.04M |
| Voloridge investment management | 39.38K | 0.01% | -699.57K |
New Positions
| Holder | Shares | % Assets | Change | Value |
|---|---|---|---|---|
| Norges bank | 1.83M | 0.02% | 1.83M | $126.61M |
| Kynam capital management, lp | 1.00M | 5.17% | 1.00M | $67.00M |
| Holocene advisors, lp | 687.71K | 0.15% | 687.71K | $47.48M |
| Brown advisory | 663.00K | 0.06% | 663.00K | $45.77M |
| Paradigm biocapital advisors lp | 451.36K | 1.58% | 451.36K | $34.43M |
Sold Out
| Holder | Change |
|---|---|
| Raleigh capital management | -4.00 |
| Riverview trust | -6.00 |
| Fortitude family office | -7.00 |
| Valley national advisers | -22.00 |
| Capital performance advisors llp | -23.00 |
Institutional Ownership Trends
| Date | Holdings | Change % | Shares | Change % | Ownership | Change % | Increased Position | Change % | Decreased Position | Change % |
|---|---|---|---|---|---|---|---|---|---|---|
| Mar 31, 2025 | 18 | -96.26% | 8,467,233 | -95.61% | 4 | 0.04% | 10 | -95.95% | 4 | -97.39% |
| Dec 31, 2024 | 441 | -2.86% | 179,579,885 | -3.86% | 103 | 0.89% | 220 | -15.38% | 144 | 25.22% |
| Sep 30, 2024 | 451 | 3.68% | 186,766,280 | 6.62% | 107 | 0.77% | 258 | -4.80% | 115 | 18.56% |
| Jun 30, 2024 | 435 | 32.62% | 175,177,026 | 18.19% | 117 | 1.18% | 271 | 83.11% | 97 | - |
| Mar 31, 2024 | 328 | 12.71% | 148,210,705 | -0.87% | 99 | 0.88% | 148 | 4.96% | 97 | 4.30% |
Top Mutual Funds Shareholders
| Holder | Shares | % Holding | Change |
|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 5.81M | 3.24% | 3.83K |
| Vanguard US Total Market Shares ETF | 5.46M | 3.00% | 368.94K |
| Vanguard Small Cap Index | 4.57M | 2.54% | 21.30K |
| Capital Group Growth Fnd of Amer Comp | 4.74M | 2.49% | 196.69K |
| American Funds Growth Fund of Amer A | 4.74M | 2.49% | 196.69K |
| iShares Russell 2000 ETF | 4.32M | 2.41% | - |
| T. Rowe Price New Horizons | 3.62M | 1.90% | -526.30K |
| US Small-Cap Growth II Equity Comp | 3.62M | 1.90% | -996.88K |
| BioPharma Credit Ord | 3.17M | 1.67% | 838.84K |
| Vanguard Institutional Extnd Mkt Idx Tr | 2.79M | 1.56% | 22.70K |
Recent Insider Transactions
| Date | Name | Role | Activity | Value |
|---|---|---|---|---|
| Jul 21, 2025 | Bonstein Sara | Chief Financial Officer | Sell | $2.71M |
| Jul 21, 2025 | Bonstein Sara | Chief Financial Officer | Sell | $3.29M |
| Jul 15, 2025 | Lewis William | Chair and CEO | Sell | $220.51K |
| Jul 15, 2025 | Lewis William | Chair and CEO | Sell | $17.56K |
| Jul 15, 2025 | Lewis William | Chair and CEO | Sell | $461.15K |
Insider Transactions Trends
| Date | Buy | Sell |
|---|---|---|
| 2025 Q3 | - | 12 |
| 2025 Q2 | 2 | 70 |
| 2025 Q1 | - | 87 |
| 2024 Q4 | - | 10 |
| 2024 Q3 | - | 12 |
INSM Ownership FAQ
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