13F Insight
DOSSIER · 13F Holders · Q1 2026BellwetherCompounder
ATEX

ANTERIX INC

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

CUSIP 03676c100·140 13F holders·last filed Mar 31, 2026
Market cap
—
▲ 9.2%
vs prior quarter
13F value held
$538M
51.0% inst. owned
of float
Holders
140
+117 QoQ
filers reporting
Activity
+45 / −25
+901 added · −925 reduced
this quarter
Concentration
38.38%
Owl Creek Asset Management, L.P. #1
top holder share
AI Holders Summary · Q1 2026

140 institutions reported ATEX in Q1 2026. Owl Creek Asset Management, L.P. leads at 38.4% of the visible book. +117 net new institutions vs prior quarter — accumulation reading.

Top holders

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

#HolderValueShares% port.Quarter
01
Owl Creek Asset Management, L.P.
CIK 0001313756
$207M5.4M14.95%Q1 202602
Heard Capital LLC
CIK 0001796409
$66M1.7M3.39%Q1 202603
BlackRock, Inc.
CIK 0002012383
$38M1.0M0.00%Q1 202604
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$22M574K0.00%Q1 202605
QVT Financial LP
CIK 0001290162
$19M504K1.41%Q1 202606
PLUSTICK MANAGEMENT LLC
CIK 0001643351
$19M500K10.16%Q1 202607
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$18M459K0.00%Q1 202608
GAMCO INVESTORS, INC. ET AL
CIK 0000807249
$16M426K0.16%Q1 202609
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$16M425K0.00%Q1 202610
STATE STREET CORP
CIK 0000093751
$15M388K0.00%Q1 202611
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$14M374K0.00%Q1 202612
Caption Management, LLC
CIK 0001706766
$13M345K0.08%Q1 202613
GARNET EQUITY CAPITAL HOLDINGS, INC.
CIK 0001423876
$13M343K2.04%Q1 202614
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$12M308K0.00%Q1 202615
GRATIA CAPITAL, LLC
CIK 0001599793
$11M288K4.83%Q1 202616
GABELLI FUNDS LLC
CIK 0001081407
$10M266K0.07%Q1 202617
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$9M247K0.00%Q1 202618
Potomac Capital Management, Inc.
CIK 0001418746
$7M181K6.02%Q1 202619
Price Jennifer C.
CIK 0001930102
$6M210K8.54%Q4 202420
DG Capital Management, LLC
CIK 0001512716
$6M168K1.97%Q1 2026
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