13F reference period
Q2 2026
Security Snapshot
Amentum Holdings, Inc. - COMM (AMTM) Institutional Ownership
CUSIP: 023939101
13F Institutional Holders and Ownership History from Q3 2024 to Q3 2026
Institutions Reporting
460
Shares (Excl. Options)
209.53M
Full value: 209,525,917 · shares · 30 Jun 2026Price
$20.67
The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.
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- Security type / class
- Equity / COMM
- Symbol
- AMTM on NYSE
- All holders as of 30 Jun 2026
- Q2 2026
- Total 13F shares
- 209,525,917
- Total 13F value
- $4,331,699,554
- Portfolio coverage rank
- 0.01%
- Share change
- +7,627,008
- Value change
- +$125,024,853
- Number of holders
- 460
- Shares outstanding
- 244,244,612
- SEC-reported price per share
- $18.97
- Insider filing price
- $18.97
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
3 identity fields
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source
Key facts
- AMTM - Amentum Holdings, Inc. - COMM is tracked under CUSIP 023939101.
- 460 institutions reported positions in Q2 2026.
- 5 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 484 to 460 between Q1 2026 and Q2 2026.
- SEC-reported value moved from to
$5.27B
Full value: $5,267,783,544 · USD · 31 Mar 2026.$4.33B
Full value: $4,331,699,554 · USD · 30 Jun 2026
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
Open SEC evidence
Latest holder context comes from 460 institutions filings for Q2 2026.
Security key
023939101
13F reference period
Q2 2026
13F holders
460
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
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 023939101:
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,
460
institutional investors reported holding
shares of
Amentum Holdings, Inc. - COMM (AMTM).
This represents
86%
of the company’s total
outstanding shares.
209.53M
Full value: 209,525,917 · shares · 30 Jun 2026244.24M
Full value: 244,244,612 · shares · Stored outstanding share count13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
69%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| AMERICAN SECURITIES LLC | 18% | 45,026,743 | 0% | 25% | $930,702,778 |
| 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 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
9
Headline period
Q2 2026
Rows shown
1-9 of 9
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q3 | 110,822,212 | $2,009,187,096 | -$6,165,304 | $18.12 | 214 |
| 2026 Q2 | 209,525,917 | $4,331,699,554 | +$125,024,853 | $20.67 | 460 |
| 2026 Q1 | 201,987,607 | $5,267,783,544 | +$195,815,948 | $26.08 | 484 |
| 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 |