13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger
IONS 1.75 06/15/28

IONIS PHARMACEUTICALS INC

50 institutions still hold IONIS PHARMACEUTICALS INC as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 462222AF7·50 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 6.8%
vs prior quarter
13F value held
$638M
68.0% inst. owned
of float
Holders
50
+122 QoQ
filers reporting
Activity
+44 / −38
+880 added · −859 reduced
this quarter
Concentration
20.15%
VOYA INVESTMENT MANAGEMENT LLC #1
top holder share
AI Holders Summary · Q1 2026

50 institutions reported IONS 1.75 06/15/28 in Q1 2026. VOYA INVESTMENT MANAGEMENT LLC leads at 20.1% of the visible book. +122 net new institutions vs prior quarter — accumulation reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
VOYA INVESTMENT MANAGEMENT LLC
CIK 0001068837
$129M85.3M0.13%Q1 202602
DEERFIELD MANAGEMENT COMPANY, L.P.
CIK 0001009258
$95M60.0M1.22%Q4 202503
DLD Asset Management, LP
CIK 0001578299
$83M55.0M7.56%Q1 202604
LMR Partners LLP
CIK 0001578621
$56M37.3M0.12%Q1 202605
BALYASNY ASSET MANAGEMENT L.P.
CIK 0001218710
$53M35.0M0.07%Q1 202606
TENOR CAPITAL MANAGEMENT Co., L.P.
CIK 0001346554
$33M21.7M0.51%Q1 202607
BlackRock, Inc.
CIK 0002012383
$29M19.2M0.00%Q1 202608
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$21M13.9M0.00%Q1 202609
Calamos Advisors LLC
CIK 0001316507
$20M13.4M0.07%Q1 202610
STATE STREET CORP
CIK 0000093751
$18M11.9M0.00%Q1 202611
MACKAY SHIELDS LLC
CIK 0000061227
$16M10.4M0.58%Q1 202612
ARISTEIA CAPITAL, L.L.C.
CIK 0001080171
$15M10.0M0.31%Q1 202613
M&G Plc
CIK 0001802539
$11M7.3M0.06%Q1 202614
FMR LLC
CIK 0000315066
$11M7.0M0.00%Q1 202615
BNP PARIBAS FINANCIAL MARKETS
CIK 0001166588
$10M6.7M0.00%Q1 202616
Focus Partners Wealth
CIK 0001542153
$8M5.3M0.01%Q4 202517
JPMORGAN CHASE & CO
CIK 0000019617
$8M5.3M0.00%Q1 202618
ADVENT CAPITAL MANAGEMENT /DE/
CIK 0001097278
$8M5.1M0.21%Q1 202619
WELLS FARGO & COMPANY/MN
CIK 0000072971
$8M5.0M0.00%Q1 202620
Sonora Investment Management Group, LLC
CIK 0001907552
$7M5.3M0.51%Q3 2025
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