AI Holders Summary · Q1 2026

260 institutions reported ATRC in Q1 2026. ALLIANCEBERNSTEIN L.P. leads at 12.5% of the visible book.

Top holders

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

Hide index funds / market makers / custodians(4 on this page)

#HolderValueShares% port.Quarter

ALLIANCEBERNSTEIN L.P.

CIK 0001109448

$129M3.3M0.04%Q1 2026 02

BlackRock, Inc.

CIK 0002012383

$125M4.5M0.00%Q2 2026 03

WELLINGTON MANAGEMENT GROUP LLP

CIK 0000902219

$98M3.5M0.02%Q2 2026 04

Vanguard Portfolio Management

CIK 0002100121· Index

$87M3.1M0.00%Q2 2026 05

Hood River Capital Management LLC

CIK 0001578177

$81M2.9M0.59%Q2 2026 06

VANGUARD CAPITAL MANAGEMENT LLC

CIK 0002100119· Index

$61M2.2M0.00%Q2 2026 07

Delaware Management Holdings, Inc.

CIK 0000921739

$49M1.7M0.07%Q2 2026 08

GOLDMAN SACHS GROUP INC

CIK 0000886982

$45M1.6M0.00%Q2 2026 09

STATE STREET CORP

CIK 0000093751

$39M1.4M0.00%Q2 2026 10

MARSHALL WACE, LLP

CIK 0001318757

$37M1.3M0.03%Q2 2026 11

GEODE CAPITAL MANAGEMENT, LLC

CIK 0001214717· Index

$37M1.3M0.00%Q2 2026 12

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

CIK 0001164508

$36M1.3M0.02%Q2 2026 13

DIMENSIONAL FUND ADVISORS LP

CIK 0000354204· Quasi-passive

$29M1.0M0.01%Q2 2026 14

GW&K Investment Management, LLC

CIK 0001082917

$27M963K0.24%Q1 2026 15

Neuberger Berman Group LLC

CIK 0001465109

$27M948K0.02%Q2 2026 16

Champlain Investment Partners, LLC

CIK 0001315478

$26M939K0.67%Q2 2026 17

BNP Paribas Asset Management Holding S.A.

CIK 0001520354

$25M897K0.03%Q2 2026 18

BANK OF AMERICA CORP /DE/

CIK 0000070858

$24M874K0.00%Q2 2026 19

KENNEDY CAPITAL MANAGEMENT LLC

CIK 0000884589

$24M858K0.42%Q2 2026 20

Divisadero Street Capital Management, LP

CIK 0001901865

$22M801K0.51%Q2 2026

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