INSMED INC (INSM)
Institutional ownership reported to the SEC as of Q2 2026, across 31 quarters.
633
Reporting holders
$23.9B
Reported value
99.5%
Of shares outstanding
3.7%
Held as options
-2
Holder change
Institutions report 217,293,536 shares against 218,381,503 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. A figure this high can overstate: where an adviser and a sub-adviser both report the same shares, both are counted.
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| FMR LLC | $1.7B | 16,143,583 | 0.07% | 31q | +22.7%+$318.1M |
| BlackRock, Inc. | $1.7B | 15,807,984 | 0.03% | 8q | -5.2%-$92.8M |
| JPMORGAN CHASE & CO | $1.2B | 10,428,170 | 0.07% | 31q | -56.8%-$1.6B |
| VANGUARD PORTFOLIO MANAGEMENT LLC | $1.1B | 10,407,962 | 0.05% | 2q | HELD |
| VANGUARD CAPITAL MANAGEMENT LLC | $1.0B | 9,790,865 | 0.02% | 2q | +1.5%+$15.9M |
| BAKER BROS. ADVISORS LP | $937.8M | 8,796,111 | 4.70% | 31q | +18.5%+$146.6M |
| Capital International Investors | $878.3M | 8,238,124 | 0.18% | 10q | +47.2%+$281.8M |
| Darwin Global Management, Ltd. | $673.6M | 6,431,163 | 17.91% | 9q | -61.7%-$1.1B |
| AMERIPRISE FINANCIAL INC | $658.9M | 6,179,571 | 0.13% | 31q | +1.0%+$6.8M |
| Orbis Allan Gray Ltd | $647.9M | 6,076,487 | 2.23% | 5q | +224.5%+$448.2M |
| STATE STREET CORP | $645.3M | 6,052,174 | 0.02% | 31q | +9.0%+$53.4M |
| D. E. Shaw & Co., Inc. | $633.1M | 5,877,959 | 0.30% | 31q | +4.5%+$27.2M |
| Artisan Partners Limited Partnership | $580.2M | 5,441,718 | 0.92% | 9q | -16.6%-$115.7M |
| RTW INVESTMENTS, LP | $516.3M | 4,842,880 | 4.41% | 13q | HELD |
| GEODE CAPITAL MANAGEMENT, LLC | $448.8M | 4,220,155 | 0.02% | 31q | -5.2%-$24.5M |
| NORGES BANK | $360.1M | 3,377,641 | 0.04% | 32q | +16.0%+$49.8M |
| CITADEL ADVISORS LLC | $339.9M | 2,556,973 | 0.04% | 31q | +17.2%+$49.8M |
| MILLENNIUM MANAGEMENT LLC | $312.2M | 2,048,005 | 0.11% | 14q | +76.9%+$135.7M |
| Jupiter Topco LLC | $277.8M | 2,605,181 | 0.11% | new | FIRST |
| UBS Group AG | $275.8M | 2,584,446 | 0.04% | 31q | +48.7%+$90.4M |
| FRANKLIN RESOURCES INC | $242.4M | 2,273,222 | 0.05% | 29q | -13.1%-$36.7M |
| GOLDMAN SACHS GROUP INC | $241.1M | 1,409,885 | 0.02% | 31q | +49.6%+$79.9M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | $230.7M | 729,354 | 0.02% | 31q | +320.1%+$175.8M |
| MAVERICK CAPITAL LTD | $229.3M | 2,150,762 | 2.03% | new | NEW |
| Qube Research & Technologies Ltd | $179.4M | 1,682,334 | 0.17% | 2q | +1032.8%+$163.5M |
| WESTFIELD CAPITAL MANAGEMENT CO LP | $173.7M | 1,629,561 | 0.57% | 8q | +11.0%+$17.2M |
| Caption Management, LLC | $171.3M | 236,000 | 0.80% | 18q | HELD |
| Integral Health Asset Management, LLC | $170.6M | 1,600,000 | 6.74% | 11q | +6.7%+$10.7M |
| VANGUARD FIDUCIARY TRUST CO | $149.4M | 1,401,552 | 0.03% | 2q | +3.5%+$5.0M |
| Bellevue Group AG | $148.6M | 1,393,418 | 3.13% | 31q | +13787.0%+$147.5M |
| Balyasny Asset Management L.P. | $143.2M | 1,326,430 | 0.18% | 5q | +498.3%+$119.3M |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $142.3M | 1,335,071 | 0.03% | 31q | +9.9%+$12.8M |
| Paradigm Biocapital Advisors LP | $141.4M | 1,325,977 | 2.65% | 2q | +5.7%+$7.6M |
| NORTHERN TRUST CORP | $140.2M | 1,315,325 | 0.02% | 31q | +1.6%+$2.3M |
| Bank of New York Mellon Corp | $140.0M | 1,312,756 | 0.02% | 31q | +4.0%+$5.3M |
| TWO SIGMA INVESTMENTS, LP | $133.3M | 1,242,222 | 0.10% | 16q | +424.1%+$107.9M |
| Palo Alto Investors LP | $132.4M | 1,241,940 | 6.10% | 31q | +199.1%+$88.1M |
| MORGAN STANLEY | $131.5M | 1,233,498 | 0.01% | 35q | -7.4%-$10.5M |
| Pictet Asset Management Holding SA | $129.8M | 1,220,353 | 0.12% | 12q | +10.7%+$12.6M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $129.4M | 1,213,963 | 0.02% | 31q | +13.5%+$15.4M |
| Sixth Street Partners Management Company, L.P. | $129.4M | 1,213,963 | 0.02% | new | NEW |
| Hood River Capital Management LLC | $112.7M | 1,056,871 | 0.82% | 11q | +53.5%+$39.3M |
| BANK OF AMERICA CORP /DE/ | $109.1M | 1,023,114 | 0.01% | 31q | -31.9%-$51.1M |
| SEI INVESTMENTS CO | $108.3M | 1,015,870 | 0.10% | 31q | -27.2%-$40.5M |
| Castle Hook Partners LP | $105.9M | 993,310 | 0.49% | 5q | -21.8%-$29.5M |
| JANE STREET GROUP, LLC | $105.8M | 193,528 | 0.01% | 28q | +1597.5%+$99.5M |
| JENNISON ASSOCIATES LLC | $96.5M | 905,094 | 0.06% | 11q | +49.7%+$32.0M |
| Polar Capital Holdings Plc | $95.0M | 890,872 | 0.22% | 23q | +142.0%+$55.7M |
| FIL Ltd | $91.3M | 856,214 | 0.07% | 16q | +3.3%+$2.9M |
| PRINCIPAL FINANCIAL GROUP INC | $91.3M | 856,126 | 0.04% | 31q | -6.6%-$6.4M |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $90.6M | 850,000 | 0.13% | 12q | -5.6%-$5.3M |
| Fiera Capital Corp | $89.9M | 843,042 | 0.33% | 9q | -17.5%-$19.1M |
| Legal & General Group Plc | $88.1M | 826,431 | 0.02% | 31q | +5.0%+$4.2M |
| FRONTIER CAPITAL MANAGEMENT CO LLC | $84.8M | 795,242 | 0.79% | 10q | +69.4%+$34.7M |
| AMERICAN CENTURY COMPANIES INC | $81.0M | 759,735 | 0.04% | 30q | -17.9%-$17.7M |
| SAMLYN CAPITAL, LLC | $78.1M | 732,568 | 1.27% | 4q | +75.6%+$33.6M |
| TimesSquare Capital Management, LLC | $77.6M | 728,096 | 1.14% | 8q | +24.5%+$15.3M |
| Clearbridge Investments, LLC | $76.3M | 715,922 | 0.06% | 10q | +11.3%+$7.7M |
| ALLIANCEBERNSTEIN L.P. | $75.7M | 462,796 | 0.03% | 31q | -32.8%-$36.9M |
| Ensign Peak Advisors, Inc | $74.9M | 702,951 | 0.12% | 19q | -29.7%-$31.6M |
| DEUTSCHE BANK AG\ | $73.6M | 690,590 | 0.02% | 34q | +22.8%+$13.7M |
| RAYMOND JAMES FINANCIAL INC | $70.4M | 660,601 | 0.02% | 7q | -14.8%-$12.2M |
| Squarepoint Ops LLC | $69.7M | 616,464 | 0.08% | 5q | +1468.0%+$65.2M |
| Affinity Asset Advisors, LLC | $69.3M | 650,000 | 3.13% | 9q | +35.4%+$18.1M |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC | $67.2M | 629,831 | 0.20% | 26q | -30.2%-$29.1M |
| AQR CAPITAL MANAGEMENT LLC | $65.3M | 612,832 | 0.02% | 31q | -9.3%-$6.7M |
| Railway Pension Investments Ltd | $64.5M | 604,700 | 0.81% | new | NEW |
| Swiss National Bank | $63.3M | 593,512 | 0.03% | 31q | -5.2%-$3.5M |
| Nuveen, LLC | $63.1M | 591,844 | 0.02% | 6q | +10.7%+$6.1M |
| Artia Global Partners LP | $62.8M | 589,052 | 11.59% | 11q | -6.3%-$4.2M |
| EVENTIDE ASSET MANAGEMENT, LLC | $62.2M | 583,665 | 0.83% | 15q | +6.8%+$4.0M |
| Aberdeen Group plc | $61.6M | 577,437 | 0.09% | 11q | +108.4%+$32.0M |
| Davern Capital Partners, LP | $59.7M | 559,824 | 10.18% | 2q | +206.6%+$40.2M |
| Candriam S.C.A. | $59.1M | 555,131 | 0.27% | 25q | +38.2%+$16.3M |
| WELLINGTON MANAGEMENT GROUP LLP | $58.0M | 543,893 | 0.01% | 9q | +36.3%+$15.4M |
| Point72 Asset Management, L.P. | $57.5M | 536,997 | 0.06% | 5q | HELD |
| Long Focus Capital Management, LLC | $56.3M | 528,000 | 1.44% | 19q | +264.1%+$40.8M |
| TUDOR INVESTMENT CORP ET AL | $54.8M | 195,391 | 0.08% | 8q | HELD |
| MARSHALL WACE, LLP | $53.5M | 501,930 | 0.04% | 13q | +60.6%+$20.2M |
| Amundi | $52.0M | 487,525 | 0.01% | 7q | -39.4%-$33.8M |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $50.7M | 475,307 | 0.05% | 18q | +1.6%+$805.3K |
| Bridgewater Associates, LP | $48.6M | 455,392 | 0.20% | 2q | +54.1%+$17.0M |
| Sumitomo Mitsui Trust Group, Inc. | $46.7M | 437,713 | 0.03% | 3q | -12.7%-$6.8M |
| Assenagon Asset Management S.A. | $46.5M | 436,540 | 0.03% | 19q | +590.1%+$39.8M |
| BNP PARIBAS FINANCIAL MARKETS | $44.9M | 400,765 | 0.02% | 15q | -33.7%-$22.8M |
| ROYAL BANK OF CANADA | $44.4M | 416,487 | 0.01% | 31q | -20.4%-$11.4M |
| VANGUARD ASSET MANAGEMENT, Ltd | $44.4M | 416,108 | 0.03% | 2q | +15.6%+$6.0M |
| DIMENSIONAL FUND ADVISORS LP | $43.5M | 408,388 | 0.01% | 9q | +1.9%+$798.1K |
| Eagle Health Investments LP | $41.0M | 384,130 | 6.79% | 9q | +71.3%+$17.0M |
| NEUBERGER BERMAN GROUP LLC | $40.4M | 378,816 | 0.03% | 21q | +39.9%+$11.5M |
| Prosight Management, LP | $40.0M | 375,609 | 6.90% | new | NEW |
| Invesco Ltd. | $39.3M | 368,261 | 0.00% | 30q | -94.3%-$655.1M |
| GATEWAY INVESTMENT ADVISERS LLC | $38.9M | 365,000 | 0.38% | 3q | HELD |
| Rock Springs Capital Management LP | $38.6M | 362,150 | 1.88% | 9q | +15.2%+$5.1M |
| ENVESTNET ASSET MANAGEMENT INC | $35.9M | 336,997 | 0.01% | 26q | +12.4%+$4.0M |
| VICTORY CAPITAL MANAGEMENT INC | $32.7M | 306,651 | 0.02% | 28q | -22.6%-$9.6M |
| NEW YORK STATE COMMON RETIREMENT FUND | $32.4M | 304,236 | 0.04% | 31q | +3.6%+$1.1M |
| SCHRODER INVESTMENT MANAGEMENT GROUP | $31.8M | 298,372 | 0.02% | 11q | +148.7%+$19.0M |
| Mitsubishi UFJ Asset Management Co., Ltd. | $30.9M | 289,594 | 0.02% | 12q | +13.5%+$3.7M |
| IMC-Chicago, LLC | $30.5M | 76,126 | 0.01% | 4q | +1602.3%+$28.7M |
Five percent filings
Anyone crossing 5% of a company must say so within days - far sooner than the next quarterly holdings report. A 13D declares an intent to influence the company; a 13G is the passive version. See all activist filings →
| Filed | Form | Filer | % of class |
|---|---|---|---|
| 2026-08-14 | 13G/A | Darwin Global Management, Ltd.with 2 co-filers | 3.0% |
| 2026-08-06 | 13G/A | FMR LLCwith 1 co-filers | 7.4% |
| 2026-07-22 | 13G/A | JPMORGAN CHASE & CO. | 4.7% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 633 | $23.9B | 217,293,536 | 106 | 225 | 212 | 3.7% |
| Q1 2026 | 635 | $35.8B | 217,939,909 | 86 | 262 | 189 | 1.6% |
| Q4 2025 | 645 | $37.8B | 208,961,008 | 164 | 219 | 171 | 3.7% |
| Q3 2025 | 532 | $33.1B | 222,717,581 | 123 | 176 | 185 | 3.8% |
| Q2 2025 | 483 | $19.9B | 197,066,441 | 115 | 151 | 172 | 3.0% |
| Q1 2025 | 411 | $13.9B | 178,757,367 | 50 | 162 | 134 | 1.5% |
| Q4 2024 | 409 | $12.3B | 171,710,295 | 47 | 158 | 132 | 3.4% |
| Q3 2024 | 382 | $12.9B | 171,122,566 | 61 | 164 | 107 | 3.3% |
| Q2 2024 | 365 | $11.6B | 160,055,502 | 120 | 124 | 96 | 7.8% |
| Q1 2024 | 273 | $3.8B | 133,730,677 | 45 | 83 | 83 | 4.2% |
| Q4 2023 | 255 | $4.1B | 130,460,992 | 38 | 81 | 74 | 1.5% |
| Q3 2023 | 229 | $3.2B | 124,161,679 | 43 | 77 | 67 | 1.6% |
| Q2 2023 | 198 | $2.6B | 123,077,678 | 24 | 66 | 63 | 1.0% |
| Q1 2023 | 198 | $2.2B | 125,734,330 | 29 | 63 | 57 | 0.7% |
| Q4 2022 | 181 | $2.2B | 110,534,126 | 31 | 75 | 46 | 0.3% |
| Q3 2022 | 239 | $2.8B | 131,427,736 | 46 | 89 | 59 | 0.4% |
| Q2 2022 | 207 | $2.6B | 129,991,162 | 23 | 72 | 72 | 0.2% |
| Q1 2022 | 219 | $3.0B | 127,288,065 | 33 | 83 | 63 | 0.2% |
| Q4 2021 | 209 | $3.4B | 123,568,597 | 28 | 69 | 60 | 0.2% |
| Q3 2021 | 191 | $3.4B | 123,385,522 | 13 | 71 | 61 | 0.2% |
| Q2 2021 | 201 | $3.5B | 122,118,075 | 29 | 86 | 49 | 0.2% |
| Q1 2021 | 200 | $3.6B | 106,602,693 | 20 | 65 | 80 | 0.2% |
| Q4 2020 | 208 | $3.6B | 107,633,848 | 26 | 58 | 77 | 0.3% |
| Q3 2020 | 201 | $3.5B | 108,825,806 | 29 | 72 | 62 | 0.4% |
| Q2 2020 | 193 | $3.1B | 111,375,162 | 43 | 86 | 38 | 0.4% |
| Q1 2020 | 165 | $1.6B | 98,220,728 | 33 | 45 | 58 | 0.9% |
| Q4 2019 | 176 | $2.4B | 99,715,463 | 28 | 51 | 54 | 1.5% |
| Q3 2019 | 160 | $1.8B | 99,036,746 | 25 | 62 | 42 | 1.1% |
| Q2 2019 | 174 | $3.3B | 126,848,591 | 34 | 82 | 35 | 1.4% |
| Q1 2019 | 162 | $2.4B | 82,228,443 | 43 | 46 | 49 | 1.9% |
| Q4 2018 | 129 | $1.1B | 83,314,236 | 1 | 3 | 2 | 2.6% |