DOSSIER · 13F Holders · Q1 2026
DFTX

DEFINIUM THERAPEUTICS INC COM SHS

255 institutions still hold DEFINIUM THERAPEUTICS INC COM SHS as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 24477V105·255 13F holders·last filed Mar 31, 2026
Market cap
13F value held
$954M
visible holders
Holders
255
filers reporting
Concentration
16.79%
BlackRock, Inc. #1
top holder share
AI Holders Summary · Q1 2026

Definium Therapeutics (DFTX) carries one of the deepest institutional books in this set — 238 holders and about $1.39B in combined 13F value as of Q1 2026. BlackRock leads at roughly $160M, followed by growth specialist Driehaus Capital ($112M) and healthcare-dedicated Avoro Capital ($94.5M). The mix of an index giant with two conviction biotech investors marks genuine institutional depth.

The top of the register blends passive and active conviction. BlackRock leads at about $160 million, but the next two are dedicated growth and healthcare investors: Driehaus Capital Management at roughly $112 million and Avoro Capital Advisors at $94.5 million. Avoro in particular is a biotech-specialist fund, so its $94.5M position reads as a fundamental bet rather than index exposure.

For DFTX readers, the institutional story is one of real depth and conviction: an index anchor in BlackRock alongside two specialist managers with nine-figure positions. That combination of breadth (238 holders) and concentrated specialist interest is exactly the profile that draws further institutional attention.

Top holders

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

#HolderValueShares% port.Quarter
01
BlackRock, Inc.
CIK 0002012383
$160M8.5M0.00%Q1 2026
02
DRIEHAUS CAPITAL MANAGEMENT LLC
CIK 0000938206
$112M5.9M0.82%Q1 2026
03
Avoro Capital Advisors LLC
CIK 0001633313
$95M5.0M0.93%Q1 2026
04
JANUS HENDERSON GROUP PLC
CIK 0001274173
$67M3.6M0.03%Q1 2026
05
Deep Track Capital, LP
CIK 0001856083
$57M3.0M0.93%Q1 2026
06
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$47M2.5M0.00%Q1 2026
07
STATE STREET CORP
CIK 0000093751
$47M2.5M0.00%Q1 2026
08
Octagon Capital Advisors LP
CIK 0001839435
$46M2.4M5.10%Q1 2026
09
MARSHALL WACE, LLP
CIK 0001318757
$40M3.0M0.04%Q4 2025
10
Commodore Capital LP
CIK 0001831942
$38M2.0M2.19%Q1 2026
11
FMR LLC
CIK 0000315066
$34M1.8M0.00%Q1 2026
12
GOLDMAN SACHS GROUP INC
CIK 0000886982
$32M1.7M0.00%Q1 2026
13
WELLINGTON MANAGEMENT GROUP LLP
CIK 0000902219
$25M1.3M0.00%Q1 2026
14
Candriam S.C.A.
CIK 0001537014
$24M1.3M0.13%Q1 2026
15
BALYASNY ASSET MANAGEMENT L.P.
CIK 0001218710
$24M1.3M0.03%Q1 2026
16
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$23M1.2M0.02%Q1 2026
17
ADAGE CAPITAL PARTNERS GP, L.L.C.
CIK 0001165408
$22M1.1M0.03%Q1 2026
18
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$22M1.1M0.00%Q1 2026
19
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$21M1.1M0.00%Q1 2026
20
Holocene Advisors, LP
CIK 0001700574
$21M1.1M0.05%Q1 2026
Page 1 of 13
235 more holders available. Log in →
Insiders at DEFINIUM THERAPEUTICS INC COM SHS
Karlin DanielSullivan MarkWiley Matthew T.Barrow RobertRoberts BrandiAdsett Roger