Security Snapshot

Amentum Holdings, Inc. - COMM (AMTM) Institutional Ownership

CUSIP: 023939101

13F Institutional Holders and Ownership History from Q3 2024 to Q2 2026

Latest Period

Q2 2026

Institutions Reporting

451

Shares (Excl. Options)

164,235,078

Price

$20.67

Save this security page for your next review

Keep this CUSIP in your watchlists so you can revisit quarter changes from one place. If you create an account from here, we will bring you back after verification.

Create free account and return here Sign in and return here Review latest holder period
Security type / class
Equity / COMM
Symbol
AMTM on NYSE
All holders as of 30 Jun 2026
Q2 2026
Total 13F shares
164,235,078
Latest holder snapshot 5 signals
Total 13F value
$3,395,537,893
Portfolio coverage rank
0.01%
Share change
+7,630,955
Value change
+$125,106,730
Number of holders
451
Issuer context Names, identifiers, and filing context for this profile. 3 identity fields
Shares outstanding
244,244,612
SEC-reported price per share
$21.73
Insider filing price
$21.73
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors

Key facts

  • AMTM - Amentum Holdings, Inc. - COMM is tracked under CUSIP 023939101.
  • 451 institutions reported positions in Q2 2026.
  • 5 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Holder count moved from 483 to 451 between Q1 2026 and Q2 2026.
  • SEC-reported value moved from $5,267,276,592 to $3,395,537,893.

Research use

  • You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
  • 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.

Evidence

Source: SEC Form 13F

Latest holder context comes from 451 institutions filings for Q2 2026.

Open SEC evidence

Security key

023939101

Latest holder period

Q2 2026

13F holders

451

13D/G owners

5

CIK / CUSIP context first

Open Q2 2026 holders AMTM full holder history Amentum Holdings, Inc. SEC filings Amentum Holdings, Inc. company facts Amentum Holdings, Inc. insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows
5
Security
AMTM
Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
ASP Manager Corp. 18% $974,005,730 43,893,904 ASP Manager Corp. 17 Dec 2024
GOLDBERG ALAN E 18% $974,005,730 43,893,904 Alan E. Goldberg 17 Dec 2024
Invesco Ltd. 10% +11% $676,290,418 +$66,529,277 24,529,939 +11% Invesco Ltd. 30 Apr 2026
BlackRock, Inc. 6.9% $372,220,408 16,774,241 BlackRock, Inc. 31 Dec 2024
PRIMECAP MANAGEMENT CO/CA/ 5% $250,992,847 12,285,504 PRIMECAP MANAGEMENT CO/CA/ 30 Jun 2026

As of 30 Jun 2026, 451 institutional investors reported holding 164,235,078 shares of Amentum Holdings, Inc. - COMM (AMTM). This represents 67% of the company’s total 244,244,612 outstanding shares.

13F concentration

Top 25 institutional shareholders

Largest 13F positions for this security by reported shares and value.

Top holder share
52%
Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
Invesco Ltd. 10% 24,954,251 +16% 0.04% $515,804,369
BlackRock, Inc. 7.3% 17,906,984 +0.37% 0.01% $370,137,359
PRIMECAP MANAGEMENT CO/CA/ 5% 12,285,504 +1.7% 0.15% $253,941,367
VANGUARD PORTFOLIO MANAGEMENT LLC 3.3% 7,948,385 +1.2% 0.01% $164,293,118
VANGUARD CAPITAL MANAGEMENT LLC 2.7% 6,711,987 +0.92% 0% $138,736,771
FMR LLC 2.3% 5,679,175 +1.8% 0.01% $117,388,551
DIMENSIONAL FUND ADVISORS LP 2.3% 5,537,696 +46% 0.02% $114,458,757
STATE STREET CORP 2.1% 5,151,772 +1.4% 0% $106,487,127
FRONTIER CAPITAL MANAGEMENT CO LLC 1.7% 4,143,971 -16% 0.8% $85,655,891
Troluce Capital Advisors LLC 1.5% 3,565,399 +257% 28% $73,696,797
GEODE CAPITAL MANAGEMENT, LLC 1.1% 2,716,560 -3.5% 0% $56,171,464
GOLDMAN SACHS GROUP INC 1.1% 2,711,866 +140% 0.01% $56,054,274
MORGAN STANLEY 1.1% 2,662,329 +19% 0% $55,030,365
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.95% 2,318,581 -17% 0.06% $47,925,069
THOMPSON SIEGEL & WALMSLEY LLC 0.93% 2,281,945 +50% 0.85% $47,168,000
MILLENNIUM MANAGEMENT LLC 0.87% 2,127,779 +237% 0.03% $43,981,192
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.87% 2,120,102 +2.5% 0.01% $43,822,508
Thrivent Financial for Lutherans 0.86% 2,105,802 +0.25% 0.07% $43,527,000
BANK OF AMERICA CORP /DE/ 0.84% 2,042,897 -15% 0% $42,226,681
SEGRA CAPITAL MANAGEMENT, LLC 0.83% 2,037,890 +26% 9.7% $42,123,186
Verition Fund Management LLC 0.83% 2,019,334 +56% 0.3% $41,739,634
VAN ECK ASSOCIATES CORP 0.81% 1,988,898 +263% 0.03% $41,110,521
VOYA INVESTMENT MANAGEMENT LLC 0.81% 1,974,191 +65% 0.04% $40,806,528
UBS Group AG 0.63% 1,545,183 -9.7% 0.01% $31,938,933
NORGES BANK 0.62% 1,516,193 0% $31,339,709

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
8
Latest
Q2 2026
Rows shown
1-8 of 8
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q2 164,235,078 $3,395,537,893 +$125,106,730 $20.67 451
2026 Q1 201,968,172 $5,267,276,592 +$195,559,456 $26.08 483
2025 Q4 194,008,005 $5,627,499,458 +$52,971,670 $29.00 482
2025 Q3 193,380,844 $4,630,241,431 -$164,141,118 $23.95 457
2025 Q2 200,286,307 $4,728,932,149 +$283,438,102 $23.61 449
2025 Q1 189,918,108 $3,456,762,603 +$424,243,410 $18.20 410
2024 Q4 180,057,223 $3,789,816,275 +$1,468,894,480 $21.03 445
2024 Q3 99,712,565 $3,204,357,186 +$2,913,258,016 $32.25 480
We use cookies and similar technologies to provide certain features, enhance the user experience and, if you allow them, measure engagement and deliver advertising. Analytics and marketing storage stay off until you grant consent. By clicking on "Agree and continue", you declare your consent to the use of the selected optional cookies. Manage preferences to update or revoke optional consent for future visits. For more information, see our Privacy Policy .