AI Holders Summary · Q1 2026

144 institutions reported ATEX in Q1 2026. Owl Creek Asset Management, L.P. leads at 38.0% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(5 on this page)

#HolderValueShares% port.Quarter

Owl Creek Asset Management, L.P.

CIK 0001313756

$207M5.4M14.95%Q1 2026 02

Heard Capital LLC

CIK 0001796409

$66M1.7M3.39%Q1 2026 03

BlackRock, Inc.

CIK 0002012383

$38M1.0M0.00%Q1 2026 04

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$22M574K0.00%Q1 2026 05

QVT Financial LP

CIK 0001290162

$19M504K1.41%Q1 2026 06

PLUSTICK MANAGEMENT LLC

CIK 0001643351

$19M500K10.16%Q1 2026 07

JANE STREET GROUP, LLC

CIK 0001595888· Market maker

$18M459K0.00%Q1 2026 08

GAMCO INVESTORS, INC. ET AL

CIK 0000807249

$16M426K0.16%Q1 2026 09

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$16M425K0.00%Q1 2026 10

STATE STREET CORP

CIK 0000093751

$15M388K0.00%Q1 2026 11

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$14M374K0.00%Q1 2026 12

Caption Management, LLC

CIK 0001706766

$13M345K0.08%Q1 2026 13

GARNET EQUITY CAPITAL HOLDINGS, INC.

CIK 0001423876

$13M343K2.04%Q1 2026 14

KIRR MARBACH & CO LLC /IN/

CIK 0000764112

$12M116K2.01%Q2 2026 15

MILLENNIUM MANAGEMENT LLC

CIK 0001273087

$12M308K0.00%Q1 2026 16

GRATIA CAPITAL, LLC

CIK 0001599793

$11M288K4.83%Q1 2026 17

GABELLI FUNDS LLC

CIK 0001081407

$10M266K0.07%Q1 2026 18

SUSQUEHANNA INTERNATIONAL GROUP, LLP

CIK 0001446194· Market maker

$9M247K0.00%Q1 2026 19

Potomac Capital Management, Inc.

CIK 0001418746

$7M181K6.02%Q1 2026 20

DG Capital Management, LLC

CIK 0001512716

$6M168K1.97%Q1 2026

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