INSM · INSMED Inc · Shareholders & Ownership
Every disclosed holder of INSM in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns INSM
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 224,829,753 | 102.95% |
| Insiders (Forms 3, 4, 5) | 1,647,783 | 0.75% |
| 13D/G-only blocks | 0 | 0.00% |
| Remaining | 8,096,033 | -3.71% |
| Registered funds (N-PORT, not summed) | 82,692,526 | 37.87% |
Shares outstanding: 218,381,503, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of INSM
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
16,143,583 | ||
| 1.1 |
FMR LLC
13G
CIK 315066 · Holding company · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
16,127,583 | ||
| 1.2 |
Strategic Advisers Fidelity U.S. Total Stock Fund
Fund
S000061481 · Registered fund · May 31, 2026
Fidelity Rutland Square Trust II, not summed
|
1,260,807 | ||
| 1.3 |
Select Biotechnology Portfolio
Fund
S000007486 · Registered fund · May 31, 2026
Fidelity Select Portfolios, not summed
|
1,109,201 | ||
| 1.4 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
1,098,781 | ||
| 1.5 |
Fidelity Advisor Growth Opportunities Fund
Fund
S000005111 · Registered fund · May 31, 2026
Fidelity Advisor Series I, not summed
|
905,400 | ||
| 2 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
15,807,984 | ||
| 2.1 |
iShares Biotechnology ETF
Fund
S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,521,319 | ||
| 2.2 |
iShares Russell Mid-Cap Growth ETF
Fund
S000004336 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,265,201 | ||
| 2.3 |
iShares Russell Mid-Cap ETF
Fund
S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
880,909 | ||
| 2.4 |
iShares Russell 1000 Growth ETF
Fund
S000004346 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
819,207 | ||
| 2.5 |
BlackRock Health Sciences Opportunities Portfolio
Fund
S000001877 · Registered fund · May 29, 2026
BlackRock Funds, not summed
|
392,149 | ||
| 3 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,428,170 | ||
| 3.1 |
JPMORGAN CHASE & CO
13G
CIK 19617 · Bank · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
10,365,622 | ||
| 4 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,407,962 | ||
| 5 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
9,790,865 | ||
| 6 |
BAKER BROS. ADVISORS LP
13F
CIK 1263508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
8,796,111 | ||
| 7 |
Capital International Investors
13F
CIK 1562230 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
8,238,124 | ||
| 8 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
6,884,530 | ||
| 9 |
Darwin Global Management, Ltd.
13F
CIK 1839209 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,431,163 | ||
| 9.1 |
Darwin Global Management, Ltd.
13G
CIK 1839209 · Exempt reporting adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
6,431,163 | ||
| 10 |
Growth Fund of America
Fund
S000009228 · Registered fund · May 31, 2026
Growth Fund of America, not summed
|
6,254,890 | ||
| 11 |
AMERIPRISE FINANCIAL INC
13F
CIK 820027 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,179,571 | ||
| 11.1 |
Columbia Cornerstone Growth Fund
Fund
S000012081 · Registered fund · Jul 31, 2026
COLUMBIA FUNDS SERIES TRUST I, not summed
|
586,770 | ||
| 11.2 |
Columbia Acorn Fund
Fund
S000009184 · Registered fund · Jun 30, 2026
COLUMBIA ACORN TRUST, not summed
|
367,976 | ||
| 11.3 |
Columbia Variable Portfolio - Cornerstone Growth Fund
Fund
S000019840 · Registered fund · Jun 30, 2026
Columbia Funds Variable Series Trust II, not summed
|
249,112 | ||
| 11.4 |
Columbia Variable Portfolio - Overseas Core Fund
Fund
S000019843 · Registered fund · Jun 30, 2026
Columbia Funds Variable Series Trust II, not summed
|
205,980 | ||
| 11.5 |
Columbia Variable Portfolio - Cornerstone Equity Fund
Fund
S000060079 · Registered fund · Jun 30, 2026
Columbia Funds Variable Series Trust II, not summed
|
201,969 | ||
| 12 |
Orbis Allan Gray Ltd
13F
CIK 1663865 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,076,487 | ||
| 13 |
|
6,052,174 | ||
| 13.1 |
State Street(R) SPDR(R) S&P(R) Biotech ETF
Fund
S000010018 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
1,083,724 | ||
| 13.2 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
75,966 | ||
| 13.3 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
1,200 | ||
| 13.4 |
State Street Balanced Index Fund
Fund
S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
1,174 | ||
| 13.5 |
State Street(R) SPDR(R) Portfolio MSCI Global Stock Market ETF
Fund
S000036082 · Registered fund · Jun 30, 2026
SPDR INDEX SHARES FUNDS, not summed
|
804 | ||
| 14 |
D. E. Shaw & Co., Inc.
13F
CIK 1009207 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,877,959 | ||
| 15 |
Artisan Partners Limited Partnership
13F
CIK 1466153 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
5,441,718 | ||
| 15.1 |
Artisan Mid Cap Fund
Fund
S000006496 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
|
709,201 | ||
| 15.2 |
Artisan Global Opportunities Fund
Fund
S000023270 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
|
287,426 | ||
| 15.3 |
Artisan Global Discovery Fund
Fund
S000058458 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
|
22,129 | ||
| 16 |
RTW INVESTMENTS, LP
13F
CIK 1493215 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,842,880 | ||
| 17 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
4,220,155 | ||
| 18 |
PRICE T ROWE ASSOCIATES INC /MD/
13F
CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,405,290 | ||
| 18.1 |
T. Rowe Price Mid-Cap Growth Fund, Inc.
Fund
S000002102 · Registered fund · Jun 30, 2026
T. ROWE PRICE MID-CAP GROWTH FUND, INC., not summed
|
863,592 | ||
| 18.2 |
T. Rowe Price Health Sciences Fund, Inc.
Fund
S000002088 · Registered fund · Jun 30, 2026
T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
|
548,295 | ||
| 18.3 |
T. Rowe Price New Horizons Fund, Inc.
Fund
S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
|
508,483 | ||
| 18.4 |
T. Rowe Price All-Cap Opportunities Fund
Fund
S000002104 · Registered fund · Jun 30, 2026
T. Rowe Price All-Cap Opportunities Fund, Inc., not summed
|
461,700 | ||
| 18.5 |
T. Rowe Price Diversified Mid-Cap Growth Fund, Inc.
Fund
S000002073 · Registered fund · Jun 30, 2026
T. ROWE PRICE DIVERSIFIED MID-CAP GROWTH FUND, INC., not summed
|
280,031 | ||
| 19 |
NORGES BANK
13F
CIK 1374170 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,377,641 | ||
| 20 |
JPMorgan Large Cap Growth Fund
Fund
S000003856 · Registered fund · Jun 30, 2026
JPMorgan Trust II, not summed
|
2,790,132 | ||
| 21 |
Jupiter Topco LLC
13F
CIK 2146052 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,605,181 | ||
| 21.1 |
Janus Henderson Adaptive Risk Managed U.S. Equity Fund
Fund
S000025898 · Registered fund · Jun 30, 2026
Janus Investment Fund, not summed
|
3,520 | ||
| 22 |
|
2,584,446 | ||
| 23 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,556,973 | ||
| 24 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,486,300 | ||
| 25 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,485,777 | ||
| 26 |
VANGUARD MID-CAP INDEX FUND
Fund
S000002844 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,348,216 | ||
| 27 |
FRANKLIN RESOURCES INC
13F
CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,273,222 | ||
| 27.1 |
Putnam Sustainable Leaders Fund
Fund
S000006295 · Registered fund · Jun 30, 2026
Putnam Sustainable Leaders Fund, not summed
|
301,700 | ||
| 27.2 |
Franklin Small-Mid Cap Growth Fund
Fund
S000006888 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
|
262,483 | ||
| 27.3 |
Franklin Biotechnology Discovery Fund
Fund
S000006882 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
|
233,052 | ||
| 27.4 |
Franklin Growth Opportunities Fund
Fund
S000006878 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
|
227,635 | ||
| 27.5 |
Franklin Dynatech Fund
Fund
S000006754 · Registered fund · Jun 30, 2026
Franklin Custodian Funds, not summed
|
200,000 | ||
| 28 |
MAVERICK CAPITAL LTD
13F
CIK 934639 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,150,762 | ||
| 29 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,048,005 | ||
| 30 |
VANGUARD GROWTH INDEX FUND
Fund
S000002842 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,803,654 | ||
| 31 |
Qube Research & Technologies Ltd
13F
CIK 1729829 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,682,334 | ||
| 32 |
WESTFIELD CAPITAL MANAGEMENT CO LP
13F
CIK 1177719 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,629,561 | ||
| 33 |
T. Rowe Price Investment Management, Inc.
13F
CIK 1897612 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,622,675 | ||
| 34 |
Integral Health Asset Management, LLC
13F
CIK 1773206 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,600,000 | ||
| 35 |
JPMorgan Mid Cap Growth Fund
Fund
S000003654 · Registered fund · Jun 30, 2026
JPMorgan Trust II, not summed
|
1,433,624 | ||
| 36 |
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund
S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,432,968 | ||
| 37 |
Duquesne Family Office LLC
13F
CIK 1536411 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,424,690 | ||
| 38 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,409,885 | ||
| 38.1 |
Goldman Sachs Small/Mid Cap Growth Fund
Fund
S000009322 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
93,676 | ||
| 38.2 |
Goldman Sachs ActiveBeta(R) U.S. Large Cap Equity ETF
Fund
S000048295 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
75,524 | ||
| 38.3 |
Goldman Sachs Mid Cap Growth Fund
Fund
S000009321 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
71,983 | ||
| 38.4 |
Goldman Sachs Large Cap Equity Fund
Fund
S000009315 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
29,215 | ||
| 38.5 |
Goldman Sachs Equal Weight U.S. Large Cap Equity ETF
Fund
S000058070 · Registered fund · May 31, 2026
Goldman Sachs ETF Trust, not summed
|
24,910 | ||
| 39 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,401,552 | ||
| 40 |
Bellevue Group AG
13F
CIK 1674546 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,393,418 | ||
| 41 |
JPMorgan Growth Advantage Fund
Fund
S000004474 · Registered fund · Jun 30, 2026
J.P. Morgan Mutual Fund Investment Trust, not summed
|
1,376,019 | ||
| 42 |
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC
13F
CIK 861177 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,335,071 | ||
| 42.1 |
PACE Large Co Growth Equity Investments
Fund
S000002972 · Registered fund · Jul 31, 2026
PACE SELECT ADVISORS TRUST, not summed
|
12,277 | ||
| 43 |
Balyasny Asset Management L.P.
13F
CIK 1218710 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,326,430 | ||
| 44 |
Paradigm Biocapital Advisors LP
13F
CIK 1855655 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,325,977 | ||
| 45 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,315,325 | ||
| 45.1 |
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund
S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
|
4,108 | ||
| 46 |
Bank of New York Mellon Corp
13F
CIK 1390777 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,312,756 | ||
| 46.1 |
BNY Mellon US Large Cap Core Equity ETF
Fund
S000067260 · Registered fund · Jul 31, 2026
BNY Mellon ETF Trust, not summed
|
17,548 | ||
| 46.2 |
BNY Mellon Innovators ETF
Fund
S000080183 · Registered fund · Aug 29, 2025
BNY Mellon ETF Trust, not summed
|
8,426 | ||
| 47 |
Assenagon Asset Management S.A.
13F
CIK 1546007 · Unknown · Sep 30, 2026
|
1,266,788 | ||
| 48 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,242,222 | ||
| 49 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,233,498 | ||
| 49.1 |
Global Strategist Portfolio
Fund
S000004124 · Registered fund · Jun 30, 2026
MORGAN STANLEY INSTITUTIONAL FUND TRUST, not summed
|
684 | ||
| 49.2 |
E*TRADE No Fee Large Cap Index Fund
Fund
S000090720 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
410 | ||
| 49.3 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
385 | ||
| 49.4 |
Global Strategist Portfolio
Fund
S000004181 · Registered fund · Jun 30, 2026
MORGAN STANLEY VARIABLE INSURANCE FUND INC., not summed
|
91 | ||
| 50 |
Pictet Asset Management Holding SA
13F
CIK 1993888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,220,353 |
162 more nested rows are not shown here; Every filing lists them all.
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.
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