13F Insight
DOSSIER · 13F Holders · Q1 2026High-convictionMulti-bagger
ANAB

ANAPTYSBIO INC

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

CUSIP 032724106·211 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 3.6%
vs prior quarter
13F value held
$1.2B
68.0% inst. owned
of float
Holders
211
-97 QoQ
filers reporting
Activity
+36 / −6
+957 added · −752 reduced
this quarter
Concentration
36.85%
EcoR1 Capital, LLC #1
top holder share
AI Holders Summary · Q1 2026

211 institutions reported ANAB in Q1 2026. EcoR1 Capital, LLC leads at 36.8% of the visible book. -97 net institutions QoQ — distribution reading.

Top holders

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

#HolderValueShares% port.Quarter
01
EcoR1 Capital, LLC
CIK 0001587114
$437M7.9M18.55%Q1 202602
BlackRock, Inc.
CIK 0002012383
$93M1.7M0.00%Q1 202603
TANG CAPITAL MANAGEMENT LLC
CIK 0001232621
$74M1.3M3.75%Q1 202604
MORGAN STANLEY
CIK 0000895421
$55M994K0.00%Q1 202605
STATE STREET CORP
CIK 0000093751
$55M992K0.00%Q1 202606
Affinity Asset Advisors, LLC
CIK 0001773195
$52M940K2.69%Q1 202607
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$47M853K0.00%Q1 202608
Palo Alto Investors LP
CIK 0001306923
$35M638K5.41%Q1 202609
D. E. Shaw & Co., Inc.
CIK 0001009207
$32M670K0.02%Q4 202510
683 Capital Management, LLC
CIK 0001404574
$31M648K1.37%Q4 202511
First Light Asset Management, LLC
CIK 0001600004
$31M565K2.81%Q1 202612
Sanofi
CIK 0001121404
$30M822K9.04%Q1 202613
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$29M520K0.00%Q1 202614
Vanguard Portfolio Management
CIK 0002100121
$29M520K0.00%Q1 202615
BANK OF AMERICA CORP /DE/
CIK 0000070858
$28M501K0.00%Q1 202616
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
CIK 0001164508
$27M492K0.01%Q1 202617
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$26M476K0.01%Q1 202618
FMR LLC
CIK 0000315066
$26M473K0.00%Q1 202619
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$26M465K0.02%Q1 202620
FEDERATED HERMES, INC.
CIK 0001056288
$20M364K0.03%Q1 2026
Page 1 of 11
191 more holders available. Log in →