DOSSIER · 13F Holders · Q4 2025Cheap mega-capRe-rated

RALLYBIO CORP

6 institutions still hold RALLYBIO CORP as of Q4 2025. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 75120L100·6 13F holders·last filed Dec 31, 2025
Market cap
3.8%
vs prior quarter
13F value held
$4M
48.0% inst. owned
of float
Holders
6
+51 QoQ
filers reporting
Activity
+32 / −7
+910 added · −792 reduced
this quarter
Concentration
57.40%
5AM Venture Management, LLC #1
top holder share
AI Holders Summary · Q4 2025

6 institutions reported RALLYBIO CORP in Q4 2025. 5AM Venture Management, LLC leads at 57.4% of the visible book. +51 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
5AM Venture Management, LLC
CIK 0001799883
$2M3.6M0.78%Q4 2025
02
New Leaf Venture Partners, L.L.C.
CIK 0001631614
$2M3.3M3.99%Q3 2025
03
CITADEL ADVISORS LLC
CIK 0001423053
$174,161254K0.00%Q4 2025
04
HRT FINANCIAL LP
CIK 0001475597
$14,00021K0.00%Q4 2025
05
TWO SIGMA ADVISERS, LP
CIK 0001478735
$13,24219K0.00%Q4 2025
06
CONCOURSE FINANCIAL GROUP SECURITIES, INC.
CIK 0000752798
$00Q2 2025