13F Insight
DOSSIER · 13F Holders · Q1 2026Healthcare · Pharmaceutical PreparationsHigh-convictionMulti-bagger
ANNX

ANNEXON INC

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

CUSIP 03589W102·Pharmaceutical Preparations·217 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 1.2%
vs prior quarter
13F value held
$637M
51.0% inst. owned
of float
Holders
217
-38 QoQ
filers reporting
Activity
+26 / −6
+827 added · −715 reduced
this quarter
Concentration
12.65%
Redmile Group, LLC #1
top holder share
AI Holders Summary · Q1 2026

217 institutions reported ANNX in Q1 2026. Redmile Group, LLC leads at 12.7% of the visible book. -38 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Redmile Group, LLC
CIK 0001425738
$81M14.5M5.34%Q1 202602
BlackRock, Inc.
CIK 0002012383
$61M10.9M0.00%Q1 202603
FMR LLC
CIK 0000315066
$59M10.6M0.00%Q1 202604
BVF INC/IL
CIK 0001056807
$46M9.1M1.54%Q4 202505
STATE STREET CORP
CIK 0000093751
$38M6.9M0.00%Q1 202606
Alerce Investment Management, L.P.
CIK 0001844002
$38M7.4M66.89%Q4 202407
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$33M6.0M0.00%Q1 202608
Bain Capital Life Sciences Investors, LLC
CIK 0001703031
$29M5.2M2.60%Q1 202609
MAK CAPITAL ONE LLC
CIK 0001385702
$26M4.7M3.86%Q1 202610
Bellevue Group AG
CIK 0001674546
$26M5.2M0.49%Q4 202511
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 0001165408
$24M4.3M0.04%Q1 202612
BANK OF AMERICA CORP /DE/
CIK 0000070858
$24M4.3M0.00%Q1 202613
Nuveen, LLC
CIK 0001871926
$24M4.2M0.01%Q1 202614
Siren, L.L.C.
CIK 0002005245
$22M4.0M0.61%Q1 202615
BALYASNY ASSET MANAGEMENT L.P.
CIK 0001218710
$22M3.9M0.03%Q1 202616
AMERIPRISE FINANCIAL INC
CIK 0000820027
$19M3.4M0.00%Q1 202617
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$19M3.4M0.00%Q1 202618
Qube Research & Technologies Ltd
CIK 0001729829
$17M3.1M0.02%Q1 202619
Palo Alto Investors LP
CIK 0001306923
$16M2.9M2.50%Q1 202620
MORGAN STANLEY
CIK 0000895421
$15M2.7M0.00%Q1 2026
Page 1 of 11
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