13F Insight
DOSSIER · 13F Holders · Q1 2026Mega-capCrowded
RLYB

RALLYBIO CORP COM

36 institutions still hold RALLYBIO CORP COM as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 75120L209·36 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 1.4%
vs prior quarter
13F value held
$39M
74.0% inst. owned
of float
Holders
36
+43 QoQ
filers reporting
Activity
+81 / −40
+863 added · −875 reduced
this quarter
Concentration
18.48%
FMR LLC #1
top holder share
AI Holders Summary · Q1 2026

36 institutions reported RLYB in Q1 2026. FMR LLC leads at 18.5% of the visible book. +43 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
FMR LLC
CIK 0000315066
$7M793K0.00%Q1 202602
VIKING GLOBAL INVESTORS LP
CIK 0001103804
$5M524K0.01%Q1 202603
Cormorant Asset Management, LP
CIK 0001583977
$4M400K0.18%Q1 202604
TPG GP A, LLC
CIK 0001903793
$3M379K0.09%Q1 202605
BALYASNY ASSET MANAGEMENT L.P.
CIK 0001218710
$3M377K0.00%Q1 202606
Laurion Capital Management LP
CIK 0001390202
$3M303K0.12%Q1 202607
Nantahala Capital Management, LLC
CIK 0001472322
$3M301K0.10%Q1 202608
Pivotal bioVenture Partners Investment Advisor LLC
CIK 0001844645
$3M301K0.96%Q1 202609
Almitas Capital LLC
CIK 0001596468
$2M191K0.39%Q1 202610
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
$1M157K0.00%Q1 202611
JOHNSON & JOHNSON
CIK 0000200406
$1M153K0.21%Q1 202612
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$1M112K0.00%Q1 202613
AJU IB Investment Co., Ltd.
CIK 0001710065
$846,17694K2.77%Q1 202614
Mariner, LLC
CIK 0001373442
$453,57751K0.00%Q1 202615
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$317,82135K0.00%Q1 202616
DELTEC ASSET MANAGEMENT LLC
CIK 0001269950
$302,73734K0.06%Q1 202617
Rangeley Capital, LLC
CIK 0001517796
$270,26630K0.26%Q1 202618
GTS SECURITIES LLC
CIK 0001452765· Market maker
$197,48422K0.01%Q1 202619
ADAR1 Capital Management, LLC
CIK 0001940272
$184,19921K0.01%Q1 202620
BlackRock, Inc.
CIK 0002012383
$156,84917K0.00%Q1 2026
Page 1 of 2
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