DOSSIER · 13F Holders · Q1 2026
RNA

ATRIUM THERAPEUTICS INC COM

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

CUSIP 04965N104·156 13F holders·last filed Mar 31, 2026
Market cap
—
13F value held
$160M
visible holders
Holders
156
filers reporting
Concentration
12.98%
PRICE T ROWE ASSOCIATES INC /MD/ #1
top holder share
AI Holders Summary · Q1 2026

156 institutions reported RNA in Q1 2026. PRICE T ROWE ASSOCIATES INC /MD/ leads at 13.0% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
PRICE T ROWE ASSOCIATES INC /MD/
CIK 0000080255
$21M1.6M0.00%Q1 2026
02
Sessa Capital IM, L.P.
CIK 0001595849
$20M1.5M0.34%Q2 2026
03
BlackRock, Inc.
CIK 0002012383
$19M1.4M0.00%Q2 2026
04
CRCM LP
CIK 0001483234
$17M1.3M5.67%Q2 2026
05
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$11M841K0.00%Q2 2026
06
Arbiter Partners Capital Management LLC
CIK 0001513193
$11M784K1.83%Q2 2026
07
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$10M731K0.00%Q2 2026
08
TIG Advisors, LLC
CIK 0001358253
$8M608K0.38%Q1 2026
09
CANTOR FITZGERALD, L. P.
CIK 0001024896
$7M514K0.04%Q2 2026
10
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$5M387K0.00%Q2 2026
11
TWO SIGMA INVESTMENTS, LP
CIK 0001179392
$5M345K0.00%Q2 2026
12
GOLDMAN SACHS GROUP INC
CIK 0000886982
$4M310K0.00%Q2 2026
13
STATE STREET CORP
CIK 0000093751
$4M272K0.00%Q2 2026
14
Slotnik Capital, LLC
CIK 0001963764
$3M238K0.83%Q2 2026
15
Weiss Asset Management LP
CIK 0001357550
$3M220K0.03%Q2 2026
16
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$3M201K0.00%Q2 2026
17
Schonfeld Strategic Advisors LLC
CIK 0001665241
$3M199K0.01%Q2 2026
18
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
$2M172K0.00%Q2 2026
19
NEXPOINT ASSET MANAGEMENT, L.P.
CIK 0001469877
$2M150K0.13%Q2 2026
20
Polar Asset Management Partners Inc.
CIK 0001326389
$2M150K0.03%Q2 2026
Page 1 of 8
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Insiders at ATRIUM THERAPEUTICS INC COM
Hoyos Rocio Martin →Winslow Brendan R. →Gallagher Kathleen P. →Kenney Stephanie →Boyce Sarah →Flanagan W. Michael →Younis Husam →Hughes Steven George →