Companies / Insmed Inc
Insmed Inc
Nasdaq: INSMCIK 1104506BRIDGEWATER, NJ
Insider flow · last 90 daysNet sells $8.32M
Financials · FY2025
Ownership
218.4M shares outstanding · as of Jul 31, 2026
Ownership
| Insiders | 0.57% | 1,253,786 |
| 10%+ / strategic | 17.76% | 38,781,505 |
| Institutions | 87.32% | 190,696,870 |
| Public float | 0.00% | 0 |
Reported holdings exceed shares outstanding — public float shown as 0; some positions may overlap or lag.
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 14
View all →| Insider | % of shares | Shares |
|---|---|---|
Sharoky Melvin MdDirector | 0.12% | 261,054 |
Lewis WilliamCEOChair and CEO · Director | 0.12% | 258,917 |
Adsett RogerChief Operating Officer | 0.05% | 98,603 |
McGirr David W JDirector | 0.04% | 97,723 |
Desjardins ClarissaDirector | 0.03% | 70,312 |
Bonstein SaraChief Financial Officer | 0.03% | 69,082 |
Schafer CarolDirector | 0.03% | 66,622 |
Brennan David RDirector | 0.03% | 64,238 |
Anderson Elizabeth MDirector | 0.03% | 62,034 |
Flammer Martina M.D.Chief Medical Officer | 0.03% | 60,486 |
Institutional holders 681
View all →| Holder | Value | % of shares |
|---|---|---|
| $4.04B | 10.62% | |
| $3.67B | 9.65% | |
| $3.64B | 9.59% | |
| $1.73B | 4.55% | |
| $1.69B | 7.24% | |
| $1.21B | 3.40% | |
| $919.93M | 2.58% | |
| $896.60M | 2.36% | |
| $843.01M | 2.22% | |
| $842.85M | 2.22% |
Activity
Jun 30, 2026View all →
InsidersInstitutions
Who's accumulating and trimming this stock (13F).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q1 2026 as of | Norges Bank 13F manager | Exit | Common stock | $-506.63M | -2.9M -100.00% | 0 | high |
| Q1 2026 as of | D. E. Shaw & Co., Inc. 13F manager | Add | Common stock | $208.46M | +1.3M +29.30% | 5,625,825 2.58% of shares | high |
| Q4 2025 as of | Norges Bank 13F manager | Add | Common stock | $203.30M | +1.2M +67.02% | 2,910,971 1.33% of shares | high |
| Q1 2026 as of | Westfield Capital Management Company, L.P. 13F manager | Add | Common stock | $169.40M | +1.0M +239.51% | 1,468,459 0.67% of shares | high |
| Q1 2026 as of | Baker Bros. Advisors LP 13F manager | Add | Common stock | $135.45M | +828K +12.56% | 7,421,111 3.40% of shares | high |
| Q1 2026 as of | Two Sigma Investments, LP 13F manager | Trim | Common stock | $-118.57M | -725K -75.37% | 237,017 0.11% of shares | high |
| Q1 2026 as of | Adage Capital Partners Gp, L.L.C. 13F manager | Add | Common stock | $98.11M | +600K +200.00% | 900,000 0.41% of shares | high |
| Q2 2026 as of | State Street Corporation 13F manager | Add | Common stock | $90.67M | +850K +16.35% | 6,052,174 2.77% of shares | high |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Vanguard Group Inc | Passive13G/A | — |
| BlackRock, Inc. | Passive13G/A | — |
| Darwin Global Management, Ltd. | Passive13G/A | — |
| Vanguard Capital Management | Passive13G | — |
| Fmr LLC | Passive13G | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| INSM | — | 457669307 |