DOSSIER · 13F Holders · Q2 2026Technology · Services-Business Services, NEC
AMTM

AMENTUM HOLDINGS INC

496 institutions still hold AMENTUM HOLDINGS INC as of Q2 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 023939101·Services-Business Services, NEC·496 13F holders·last filed Jun 30, 2026
Market cap
13F value held
$3.3B
visible holders
Holders
496
filers reporting
Concentration
28.05%
AMERICAN SECURITIES LLC #1
top holder share
AI Holders Summary · Q2 2026

496 institutions reported AMTM in Q2 2026. AMERICAN SECURITIES LLC leads at 28.1% of the visible book.

Top holders

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

#HolderValueShares% port.Quarter
01
AMERICAN SECURITIES LLC
CIK 0001475483
$931M45.0M24.79%Q2 2026
02
Invesco Ltd.
CIK 0000914208
$516M25.0M0.04%Q2 2026
03
BlackRock, Inc.
CIK 0002012383
$370M17.9M0.01%Q2 2026
04
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
$254M12.3M0.15%Q2 2026
05
Vanguard Portfolio Management
CIK 0002100121· Index
$164M7.9M0.01%Q2 2026
06
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$139M6.7M0.00%Q2 2026
07
FMR LLC
CIK 0000315066
$117M5.7M0.01%Q2 2026
08
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$114M5.5M0.02%Q2 2026
09
STATE STREET CORP
CIK 0000093751
$106M5.2M0.00%Q2 2026
10
FRONTIER CAPITAL MANAGEMENT CO LLC
CIK 0000351173
$86M4.1M0.80%Q2 2026
11
Troluce Capital Advisors LLC
CIK 0001910321
$74M3.6M7.59%Q2 2026
12
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$56M2.7M0.00%Q2 2026
13
GOLDMAN SACHS GROUP INC
CIK 0000886982
$56M2.7M0.00%Q2 2026
14
MORGAN STANLEY
CIK 0000895421
$55M2.7M0.00%Q2 2026
15
THRIVENT FINANCIAL FOR LUTHERANS
CIK 0000314984
$55M2.1M0.10%Q1 2026
16
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
CIK 0001705339
$48M2.3M0.06%Q2 2026
17
SEGRA CAPITAL MANAGEMENT, LLC
CIK 0001607512
$46M2.2M9.33%Q2 2026
18
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$44M2.1M0.02%Q2 2026
19
CHARLES SCHWAB INVESTMENT MANAGEMENT INC
CIK 0000884546· Index
$44M2.1M0.01%Q2 2026
20
Point72 Asset Management, L.P.
CIK 0001603466
$43M1.6M0.05%Q1 2026
Page 1 of 25
476 more holders available. Log in →
Insiders at AMENTUM HOLDINGS INC
Johnson Travis BartonMullen Sean ThomasHeller John E.Burton DarrenBruning Jill LSt. Mary Michele TArnette Stephen ADemetriou Steven J.