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IONS · Ionis Pharmaceuticals Inc · Shareholders & Ownership

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$45.40 +1.02 (+2.30%) At close · Oct 20
Market Cap
$7.54B
Shares
166.18M
Volume · Oct 20 2.49M Avg daily vol (3M) 3.28M

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 positions

No chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.

Holder group Shares % Out
Institutional (13F) 179,479,971 108.00%
Insiders (Forms 3, 4, 5) 0 0.00%
13D/G-only blocks 0 0.00%
Remaining 13,295,649 -8.00%
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
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
BlackRock, Inc.
13F CIK 2012383 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
10,704,660
3.1
iShares Biotechnology ETF
Fund S000004350 · Registered fund · Jun 30, 2026
iShares Trust, not summed
1,148,496
3.2
iShares Russell Mid-Cap Growth ETF
Fund S000004336 · Registered fund · Jun 30, 2026
iShares Trust, not summed
916,592
3.3
iShares Russell Mid-Cap ETF
Fund S000004338 · Registered fund · Jun 30, 2026
iShares Trust, not summed
676,082
3.4
iShares Russell 1000 Growth ETF
Fund S000004346 · Registered fund · Jun 30, 2026
iShares Trust, not summed
592,540
3.5
iShares U.S. Equity Factor Rotation Active ETF
Fund S000064945 · Registered fund · Jul 31, 2026
BlackRock ETF Trust, not summed
257,118
4
VANGUARD PORTFOLIO MANAGEMENT LLC
13F CIK 2100121 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
7,859,529
5
Growth Fund of America
Fund S000009228 · Registered fund · May 31, 2026
Growth Fund of America, not summed
7,668,655
6
WELLINGTON MANAGEMENT GROUP LLP
13F CIK 902219 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
7,651,415
6.1
VANGUARD HEALTH CARE FUND
Fund S000002922 · Registered fund · Jul 31, 2026
VANGUARD SPECIALIZED FUNDS, not summed
6,212,640
7
VANGUARD CAPITAL MANAGEMENT LLC
13F CIK 2100119 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
7,211,497
8
TWO SIGMA INVESTMENTS, LP
13F CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
6,252,342
9
ROYAL BANK OF CANADA
13F CIK 1000275 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
6,182,479
10
SMALLCAP World Fund Inc
Fund S000009599 · Registered fund · Jun 30, 2026
SMALLCAP World Fund Inc, not summed
5,259,919
11
VANGUARD TOTAL STOCK MARKET INDEX FUND
Fund S000002848 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
4,989,044
12
New Economy Fund
Fund S000009598 · Registered fund · May 31, 2026
New Economy Fund, not summed
4,868,802
13
STATE STREET CORP
13F CIK 93751 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
4,334,848
13.1
State Street(R) SPDR(R) S&P(R) Biotech ETF
Fund S000010018 · Registered fund · Jun 30, 2026
SPDR SERIES TRUST, not summed
1,358,012
13.2
STATE STREET SMALL/MID CAP EQUITY INDEX PORTFOLIO
Fund S000050332 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
58,521
13.3
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
13.4
State Street Balanced Index Fund
Fund S000082802 · Registered fund · Jun 30, 2026
STATE STREET INSTITUTIONAL INVESTMENT TRUST, not summed
924
13.5
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
14
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
15
VANGUARD SMALL-CAP INDEX FUND
Fund S000002845 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
3,597,995
16
GEODE CAPITAL MANAGEMENT, LLC
13F CIK 1214717 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
3,584,024
17
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
17.1
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
17.2
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
17.3
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
17.4
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
17.5
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
18
JPMORGAN CHASE & CO
13F CIK 19617 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
2,671,717
19
Artisan Partners Limited Partnership
13F CIK 1466153 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,640,024
19.1
Artisan International Small-Mid Fund
Fund S000006494 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
425,366
19.2
Artisan Small Cap Fund
Fund S000006498 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
357,738
19.3
Artisan Mid Cap Fund
Fund S000006496 · Registered fund · Jun 30, 2026
Artisan Partners Funds Inc., not summed
250,173
20
Tweedy, Browne Co LLC
13F CIK 732905 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,280,311
20.1
Tweedy, Browne International Value Fund
Fund S000001302 · Registered fund · Jun 30, 2026
Tweedy, Browne Fund Inc., not summed
1,743,125
20.2
Tweedy, Browne Value Fund
Fund S000001301 · Registered fund · Jun 30, 2026
Tweedy, Browne Fund Inc., not summed
169,635
20.3
Tweedy, Browne International Value Fund II - Currency Unhedged
Fund S000026835 · Registered fund · Jun 30, 2026
Tweedy, Browne Fund Inc., not summed
50,402
21
Deep Track Capital, LP
13F CIK 1856083 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,200,000
22
GOLDMAN SACHS GROUP INC
13F CIK 886982 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
2,109,945
22.1
Goldman Sachs Small/Mid Cap Growth Fund
Fund S000009322 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
179,014
22.2
Goldman Sachs Mid Cap Growth Fund
Fund S000009321 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
112,216
22.3
Goldman Sachs Small Cap Growth Fund
Fund S000061413 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
34,667
22.4
Goldman Sachs Large Cap Equity Fund
Fund S000009315 · Registered fund · May 31, 2026
Goldman Sachs Trust, not summed
13,939
22.5
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
23
VANGUARD SMALL-CAP GROWTH INDEX FUND
Fund S000002846 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
2,075,497
24
BAKER BROS. ADVISORS LP
13F CIK 1263508 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
2,047,727
25
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
26
AMERICAN CENTURY COMPANIES INC
13F CIK 748054 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,947,076
26.1
Select Fund
Fund S000006194 · Registered fund · Jul 31, 2026
American Century Mutual Funds, Inc., not summed
664,100
26.2
Small Cap Growth Fund
Fund S000006193 · Registered fund · Jul 31, 2026
American Century Mutual Funds, Inc., not summed
334,678
27
VANGUARD EXTENDED MARKET INDEX FUND
Fund S000002841 · Registered fund · Jun 30, 2026
VANGUARD INDEX FUNDS, not summed
1,894,588
28
Growth Fund
Fund S000008791 · Registered fund · Jun 30, 2026
AMERICAN FUNDS INSURANCE SERIES, not summed
1,674,900
29
FRANKLIN RESOURCES INC
13F CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,623,377
29.1
Franklin Dynatech Fund
Fund S000006754 · Registered fund · Jun 30, 2026
Franklin Custodian Funds, not summed
800,000
29.2
Franklin Biotechnology Discovery Fund
Fund S000006882 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
209,423
29.3
Franklin Small-Mid Cap Growth Fund
Fund S000006888 · Registered fund · Jul 31, 2026
Franklin Strategic Series, not summed
167,060
29.4
Franklin Small-Mid Cap Growth VIP Fund
Fund S000007314 · Registered fund · Jun 30, 2026
Franklin Templeton Variable Insurance Products Trust, not summed
18,771
29.5
Franklin Genomic Advancements ETF
Fund S000067393 · Registered fund · Jun 30, 2026
Franklin Templeton ETF Trust, not summed
6,739
30
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
30.1
Schwab U.S. Small-Cap ETF
Fund S000026636 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
778,644
30.2
Schwab U.S. Mid-Cap ETF
Fund S000026635 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
438,447
30.3
Schwab Total Stock Market Index Fund
Fund S000005913 · Registered fund · Jul 31, 2026
SCHWAB CAPITAL TRUST, not summed
102,310
30.4
Schwab U.S. Broad Market ETF
Fund S000026631 · Registered fund · May 31, 2026
SCHWAB STRATEGIC TRUST, not summed
96,673
30.5
Schwab 1000 Index Fund
Fund S000006807 · Registered fund · Jul 31, 2026
SCHWAB INVESTMENTS, not summed
52,950
31
BARCLAYS PLC
13F CIK 312069 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
1,603,136
32
Pictet Asset Management Holding SA
13F CIK 1993888 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,596,998
33
VANGUARD EXPLORER FUND
Fund S000002578 · Registered fund · Jul 31, 2026
VANGUARD EXPLORER FUND, not summed
1,465,677
34
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
35
Polar Capital Holdings Plc
13F CIK 1837309 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,454,021
36
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
37
NOMURA ASSET MANAGEMENT INTERNATIONAL INC.
13F CIK 921739 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,300,392
37.1
Nomura Mid Cap Growth Fund
Fund S000006293 · Registered fund · Jun 30, 2026
IVY FUNDS, not summed
546,712
37.2
Nomura Science and Technology Fund
Fund S000006285 · Registered fund · Jun 30, 2026
IVY FUNDS, not summed
529,498
37.3
Nomura VIP Mid Cap Growth Series
Fund S000006228 · Registered fund · Jun 30, 2026
Ivy Variable Insurance Portfolios, not summed
68,019
37.4
Nomura VIP Science and Technology Series
Fund S000006232 · Registered fund · Jun 30, 2026
Ivy Variable Insurance Portfolios, not summed
62,798
38
MORGAN STANLEY
13F CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
1,281,444
38.1
E*TRADE No Fee Total Market Index Fund
Fund S000090722 · Registered fund · Jul 31, 2026
E Trade Trust, not summed
205
39
Capital Group Growth ETF
Fund S000074246 · Registered fund · May 31, 2026
Capital Group Growth ETF, not summed
1,150,284
40
JPMorgan Mid Cap Growth Fund
Fund S000003654 · Registered fund · Jun 30, 2026
JPMorgan Trust II, not summed
1,123,209
41
Invesco Ltd.
13F CIK 914208 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
1,120,707
41.1
Invesco Main Street Mid Cap Fund
Fund S000064651 · Registered fund · Jun 30, 2026
AIM Growth Series (Invesco Growth Series), not summed
213,725
41.2
Invesco Small Cap Growth Fund
Fund S000000476 · Registered fund · Jun 30, 2026
AIM Growth Series (Invesco Growth Series), not summed
142,199
41.3
Invesco RAFI US 1500 Small-Mid ETF
Fund S000013120 · Registered fund · Jul 31, 2026
Invesco Exchange-Traded Fund Trust, not summed
110,761
41.4
Invesco NASDAQ Next Gen 100 ETF
Fund S000069449 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
85,316
41.5
Invesco Dorsey Wright SmallCap Momentum ETF
Fund S000037586 · Registered fund · May 31, 2026
Invesco Exchange-Traded Fund Trust II, not summed
18,861
42
VANGUARD FIDUCIARY TRUST CO
13F CIK 933478 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
1,060,845
43
Bellevue Group AG
13F CIK 1674546 · Non-US institution · Jun 30, 2026
carried, not yet filed for the newest quarter
972,258
44
GROUPAMA ASSET MANAGMENT
13F CIK 1055969 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
937,083
45
NORTHERN TRUST CORP
13F CIK 73124 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
913,610
45.1
FlexShares Morningstar US Market Factor Tilt Index Fund
Fund S000033312 · Registered fund · Jul 31, 2026
FlexShares Trust, not summed
6,110
46
Capital International Investors
13F CIK 1562230 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
823,764
47
Davern Capital Partners, LP
13F CIK 2003147 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
798,709
48
BANK OF AMERICA CORP /DE/
13F CIK 70858 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
790,990
49
SUMMIT PARTNERS PUBLIC ASSET MANAGEMENT, LLC
13F CIK 1638555 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
787,263
50
GW&K Investment Management, LLC
13F CIK 1082917 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
746,966

88 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 696 holders

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Key facts CIK 874015 CUSIP 462222100 13F (30d) 47 filings 46 filers Visit website Investor relations