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INSM · INSMED Inc · Shareholders & Ownership

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$95.67 +0.38 (+0.40%) At close · Oct 20
Market Cap
$20.89B
Shares
218.38M
Volume · Oct 20 2.61M Avg daily vol (3M) 2.61M

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 positions

No 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
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
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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
UBS Group AG
13F CIK 1610520 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
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.

Showing 1–50 of 946 holders

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Key facts CIK 1104506 CUSIP 457669307 13F (30d) 96 filings 91 filers Visit website Investor relations