IONS · Ionis Pharmaceuticals Inc · Shareholders & Ownership
Every disclosed holder of IONS 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 IONS
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) | 179,535,975 | 108.03% |
| Insiders (Forms 3, 4, 5) | 0 | 0.00% |
| 13D/G-only blocks | 25,529,821 | 15.36% |
| Remaining | 38,881,474 | -23.40% |
| Registered funds (N-PORT, not summed) | 90,323,977 | 54.35% |
Shares outstanding: 166,184,322, the issuer's latest cover-page count restated onto today's split basis.
Insiders are listed but not summed: the issuer has more than one class of common stock and Forms 3, 4 and 5 report one issuer-wide balance across them.
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 IONS
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
FMR LLC
13F
CIK 315066 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
24,631,956 | ||
| 1.1 |
Fidelity Growth Company Fund
Fund
S000007119 · Registered fund · May 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
8,471,732 | ||
| 1.2 |
Fidelity Growth Company K6 Fund
Fund
S000065696 · Registered fund · May 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
2,348,458 | ||
| 1.3 |
Fidelity Series Growth Company Fund
Fund
S000042626 · Registered fund · May 31, 2026
Fidelity Mt. Vernon Street Trust, not summed
|
2,090,022 | ||
| 1.4 |
Fidelity Extended Market Index Fund
Fund
S000006021 · Registered fund · May 31, 2026
Fidelity Concord Street Trust, not summed
|
833,613 | ||
| 1.5 |
Fidelity Mid Cap Index Fund
Fund
S000033637 · Registered fund · Jul 31, 2026
Fidelity Salem Street Trust, not summed
|
622,865 | ||
| 2 |
Capital World Investors
13F
CIK 1422849 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
21,669,226 | ||
| 3 |
VANGUARD GROUP INC
13G
CIK 102909 · Registered investment adviser · Dec 31, 2024
Rule 13d-1(b), qualified institution
|
16,472,539 | ||
| 4 |
BlackRock, Inc.
13F
CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
10,704,660 | ||
| 4.1 |
iShares Biotechnology ETF
Fund
S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
1,148,496 | ||
| 4.2 |
iShares Russell Mid-Cap Growth ETF
Fund
S000004336 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
916,592 | ||
| 4.3 |
iShares Russell Mid-Cap ETF
Fund
S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
676,082 | ||
| 4.4 |
iShares Russell 1000 Growth ETF
Fund
S000004346 · Registered fund · Jun 30, 2026
iShares Trust, not summed
|
592,540 | ||
| 4.5 |
iShares U.S. Equity Factor Rotation Active ETF
Fund
S000064945 · Registered fund · Jul 31, 2026
BlackRock ETF Trust, not summed
|
257,118 | ||
| 5 |
|
9,057,282 | ||
| 6 |
VANGUARD PORTFOLIO MANAGEMENT LLC
13F
CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,859,529 | ||
| 7 |
Growth Fund of America
Fund
S000009228 · Registered fund · May 31, 2026
Growth Fund of America, not summed
|
7,668,655 | ||
| 8 |
WELLINGTON MANAGEMENT GROUP LLP
13F
CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,651,415 | ||
| 8.1 |
VANGUARD HEALTH CARE FUND
Fund
S000002922 · Registered fund · Jul 31, 2026
VANGUARD SPECIALIZED FUNDS, not summed
|
6,212,640 | ||
| 9 |
VANGUARD CAPITAL MANAGEMENT LLC
13F
CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,211,497 | ||
| 10 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,252,342 | ||
| 11 |
ROYAL BANK OF CANADA
13F
CIK 1000275 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
6,182,479 | ||
| 12 |
SMALLCAP World Fund Inc
Fund
S000009599 · Registered fund · Jun 30, 2026
SMALLCAP World Fund Inc, not summed
|
5,259,919 | ||
| 13 |
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund
S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
4,989,044 | ||
| 14 |
New Economy Fund
Fund
S000009598 · Registered fund · May 31, 2026
New Economy Fund, not summed
|
4,868,802 | ||
| 15 |
|
4,334,848 | ||
| 15.1 |
State Street(R) SPDR(R) S&P(R) Biotech ETF
Fund
S000010018 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
1,358,012 | ||
| 15.2 |
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund
S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
58,521 | ||
| 15.3 |
State Street(R) SPDR(R) S&P Kensho New Economies Composite ETF
Fund
S000063362 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
|
21,024 | ||
| 15.4 |
State Street Balanced Index Fund
Fund
S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
|
924 | ||
| 15.5 |
State Street Total Return V.I.S. Fund
Fund
S000001637 · Registered fund · Jun 30, 2026
STATE STREET VARIABLE INSURANCE SERIES FUNDS INC, not summed
|
900 | ||
| 16 |
T. Rowe Price Investment Management, Inc.
13F
CIK 1897612 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,959,372 | ||
| 17 |
VANGUARD SMALL-CAP INDEX FUND
Fund
S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
3,597,995 | ||
| 18 |
GEODE CAPITAL MANAGEMENT, LLC
13F
CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,584,024 | ||
| 19 |
PRICE T ROWE ASSOCIATES INC /MD/
13F
CIK 80255 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
3,184,500 | ||
| 19.1 |
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
|
1,998,674 | ||
| 19.2 |
T. Rowe Price New Horizons Fund, Inc.
Fund
S000002106 · Registered fund · Jun 30, 2026
T. ROWE PRICE NEW HORIZONS FUND, INC., not summed
|
559,723 | ||
| 19.3 |
T. Rowe Price Health Sciences Fund, Inc.
Fund
S000002088 · Registered fund · Jun 30, 2026
T. ROWE PRICE HEALTH SCIENCES FUND, INC., not summed
|
433,923 | ||
| 19.4 |
T. Rowe Price Integrated U.S. Small-Cap Growth Equity Fund
Fund
S000002074 · Registered fund · Jun 30, 2026
T. ROWE PRICE INTEGRATED EQUITY FUNDS, INC., not summed
|
253,425 | ||
| 19.5 |
T. Rowe Price Institutional Mid-Cap Equity Growth Fund
Fund
S000002092 · Registered fund · Jun 30, 2026
T. Rowe Price Equity Funds, Inc., not summed
|
227,886 | ||
| 20 |
JPMORGAN CHASE & CO
13F
CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,671,717 | ||
| 21 |
Artisan Partners Limited Partnership
13F
CIK 1466153 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,640,024 | ||
| 21.1 |
Artisan International Small-Mid Fund
Fund
S000006494 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
|
425,366 | ||
| 21.2 |
Artisan Small Cap Fund
Fund
S000006498 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
|
357,738 | ||
| 21.3 |
Artisan Mid Cap Fund
Fund
S000006496 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
|
250,173 | ||
| 22 |
Tweedy, Browne Co LLC
13F
CIK 732905 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,280,311 | ||
| 22.1 |
Tweedy, Browne International Value Fund
Fund
S000001302 · Registered fund · Jun 30, 2026
Tweedy, Browne Fund Inc., not summed
|
1,743,125 | ||
| 22.2 |
Tweedy, Browne Value Fund
Fund
S000001301 · Registered fund · Jun 30, 2026
Tweedy, Browne Fund Inc., not summed
|
169,635 | ||
| 22.3 |
Tweedy, Browne International Value Fund II - Currency Unhedged
Fund
S000026835 · Registered fund · Jun 30, 2026
Tweedy, Browne Fund Inc., not summed
|
50,402 | ||
| 23 |
Deep Track Capital, LP
13F
CIK 1856083 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,200,000 | ||
| 24 |
GOLDMAN SACHS GROUP INC
13F
CIK 886982 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,109,945 | ||
| 24.1 |
Goldman Sachs Small/Mid Cap Growth Fund
Fund
S000009322 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
179,014 | ||
| 24.2 |
Goldman Sachs Mid Cap Growth Fund
Fund
S000009321 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
112,216 | ||
| 24.3 |
Goldman Sachs Small Cap Growth Fund
Fund
S000061413 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
34,667 | ||
| 24.4 |
Goldman Sachs Large Cap Equity Fund
Fund
S000009315 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
|
13,939 | ||
| 24.5 |
Goldman Sachs Variable Insurance Trust Mid Cap Growth Fund
Fund
S000009360 · Registered fund · Jun 30, 2026
Goldman Sachs Variable Insurance Trust, not summed
|
7,876 | ||
| 25 |
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund
S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
2,075,497 | ||
| 26 |
BAKER BROS. ADVISORS LP
13F
CIK 1263508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,047,727 | ||
| 27 |
DEERFIELD MANAGEMENT COMPANY, L.P.
13F
CIK 1009258 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,979,669 | ||
| 28 |
AMERICAN CENTURY COMPANIES INC
13F
CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,947,076 | ||
| 28.1 |
Select Fund
Fund
S000006194 · Registered fund · Jul 31, 2026
American Century Mutual Funds, Inc., not summed
|
664,100 | ||
| 28.2 |
Small Cap Growth Fund
Fund
S000006193 · Registered fund · Jul 31, 2026
American Century Mutual Funds, Inc., not summed
|
334,678 | ||
| 29 |
VANGUARD EXTENDED MARKET INDEX FUND
Fund
S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
|
1,894,588 | ||
| 30 |
Growth Fund
Fund
S000008791 · Registered fund · Jun 30, 2026
AMERICAN FUNDS INSURANCE SERIES, not summed
|
1,674,900 | ||
| 31 |
FRANKLIN RESOURCES INC
13F
CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,623,377 | ||
| 31.1 |
Franklin Dynatech Fund
Fund
S000006754 · Registered fund · Jun 30, 2026
Franklin Custodian Funds, not summed
|
800,000 | ||
| 31.2 |
Franklin Biotechnology Discovery Fund
Fund
S000006882 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
|
209,423 | ||
| 31.3 |
Franklin Small-Mid Cap Growth Fund
Fund
S000006888 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
|
167,060 | ||
| 31.4 |
Franklin Small-Mid Cap Growth VIP Fund
Fund
S000007314 · Registered fund · Jun 30, 2026
Franklin Templeton Variable Insurance Products Trust, not summed
|
18,771 | ||
| 31.5 |
Franklin Genomic Advancements ETF
Fund
S000067393 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
|
6,739 | ||
| 32 |
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
13F
CIK 884546 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,605,054 | ||
| 33 |
|
1,603,136 | ||
| 34 |
Pictet Asset Management Holding SA
13F
CIK 1993888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,596,998 | ||
| 35 |
VANGUARD EXPLORER FUND
Fund
S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
|
1,465,677 | ||
| 36 |
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
|
1,454,672 | ||
| 37 |
Polar Capital Holdings Plc
13F
CIK 1837309 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,454,021 | ||
| 38 |
Alyeska Investment Group, L.P.
13F
CIK 1453072 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,417,916 | ||
| 39 |
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.
13F
CIK 921739 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,300,392 | ||
| 39.1 |
Nomura Mid Cap Growth Fund
Fund
S000006293 · Registered fund · Jun 30, 2026
IVY FUNDS, not summed
|
546,712 | ||
| 39.2 |
Nomura Science and Technology Fund
Fund
S000006285 · Registered fund · Jun 30, 2026
IVY FUNDS, not summed
|
529,498 | ||
| 39.3 |
Nomura VIP Mid Cap Growth Series
Fund
S000006228 · Registered fund · Jun 30, 2026
Ivy Variable Insurance Portfolios, not summed
|
68,019 | ||
| 39.4 |
Nomura VIP Science and Technology Series
Fund
S000006232 · Registered fund · Jun 30, 2026
Ivy Variable Insurance Portfolios, not summed
|
62,798 | ||
| 40 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,281,444 | ||
| 40.1 |
E*TRADE No Fee Total Market Index Fund
Fund
S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
|
205 | ||
| 41 |
Capital Group Growth ETF
Fund
S000074246 · Registered fund · May 31, 2026
Capital Group Growth ETF, not summed
|
1,150,284 | ||
| 42 |
JPMorgan Mid Cap Growth Fund
Fund
S000003654 · Registered fund · Jun 30, 2026
JPMorgan Trust II, not summed
|
1,123,209 | ||
| 43 |
Invesco Ltd.
13F
CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,120,707 | ||
| 43.1 |
Invesco Main Street Mid Cap Fund
Fund
S000064651 · Registered fund · Jun 30, 2026
AIM Growth Series (Invesco Growth Series), not summed
|
213,725 | ||
| 43.2 |
Invesco Small Cap Growth Fund
Fund
S000000476 · Registered fund · Jun 30, 2026
AIM Growth Series (Invesco Growth Series), not summed
|
142,199 | ||
| 43.3 |
Invesco RAFI US 1500 Small-Mid ETF
Fund
S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
|
110,761 | ||
| 43.4 |
Invesco NASDAQ Next Gen 100 ETF
Fund
S000069449 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
85,316 | ||
| 43.5 |
Invesco Dorsey Wright SmallCap Momentum ETF
Fund
S000037586 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
|
18,861 | ||
| 44 |
VANGUARD FIDUCIARY TRUST CO
13F
CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
1,060,845 | ||
| 45 |
Bellevue Group AG
13F
CIK 1674546 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
|
972,258 | ||
| 46 |
GROUPAMA ASSET MANAGMENT
13F
CIK 1055969 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
937,083 | ||
| 47 |
NORTHERN TRUST CORP
13F
CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
913,610 | ||
| 48 |
Capital International Investors
13F
CIK 1562230 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
823,764 | ||
| 49 |
Davern Capital Partners, LP
13F
CIK 2003147 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
798,709 | ||
| 50 |
BANK OF AMERICA CORP /DE/
13F
CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
790,990 |
84 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 713 holders
Create a free account to page through every holder, filter by source and group by ultimate parent.