Latest Period
Q1 2026
Security Snapshot
Amentum Holdings, Inc. - Common Stock (AMTM) Institutional Ownership
CUSIP: 023939101
13F Institutional Holders and Ownership History from Q3 2024 to Q1 2026
Institutions Reporting
481
Shares (Excl. Options)
201,889,742
Price
$26.08
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- Security type / class
- Equity / Common Stock
- Symbol
- AMTM on NYSE
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 201,889,742
- Total 13F value
- $5,265,230,797
- Portfolio coverage rank
- 0.01%
- Share change
- +8,004,776
- Value change
- +$195,504,203
- Number of holders
- 481
- Shares outstanding
- 242,870,683
- SEC-reported price per share
- $23.15
- Insider filing price
- $23.15
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
Key facts
- AMTM - Amentum Holdings, Inc. - Common Stock is tracked under CUSIP 023939101.
- 481 institutions reported positions in Q1 2026.
- 4 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 480 to 481 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $5,627,487,600 to $5,265,230,797.
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 481 institutions filings for Q1 2026.
Security key
023939101
Latest holder period
Q1 2026
13F holders
481
13D/G owners
4
CIK / CUSIP context first
Open Q1 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
4
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 |
As of 31 Mar 2026, 481 institutional investors reported holding 201,889,742 shares of Amentum Holdings, Inc. - Common Stock (AMTM). This represents 83% of the company’s total 242,870,683 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
66%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| AMERICAN SECURITIES LLC | 19% | 45,026,743 | 0% | 30% | $1,174,297,457 |
| Invesco Ltd. | 8.8% | 21,473,778 | -1.6% | 0.09% | $560,036,140 |
| BlackRock, Inc. | 7.3% | 17,841,283 | +2.2% | 0.01% | $465,300,661 |
| PRIMECAP MANAGEMENT CO/CA/ | 5% | 12,085,294 | -0.34% | 0.25% | $315,184,494 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 3.2% | 7,852,951 | 0% | 0.01% | $204,804,962 |
| VANGUARD CAPITAL MANAGEMENT LLC | 2.7% | 6,650,879 | 0% | 0% | $173,454,924 |
| FMR LLC | 2.3% | 5,578,386 | -17% | 0.01% | $145,484,322 |
| STATE STREET CORP | 2.1% | 5,079,041 | +0.34% | 0% | $132,461,389 |
| FRONTIER CAPITAL MANAGEMENT CO LLC | 2% | 4,930,210 | -15% | 1.3% | $128,579,888 |
| DIMENSIONAL FUND ADVISORS LP | 1.6% | 3,787,420 | +107% | 0.02% | $98,767,206 |
| GEODE CAPITAL MANAGEMENT, LLC | 1.2% | 2,814,415 | +5.8% | 0% | $73,424,524 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1.1% | 2,785,134 | +42% | 0.1% | $72,636,295 |
| Focus Partners Wealth | 1.1% | 2,604,911 | -6.8% | 0.08% | $67,936,092 |
| BANK OF AMERICA CORP /DE/ | 0.99% | 2,405,041 | +108% | 0% | $62,723,470 |
| MORGAN STANLEY | 0.92% | 2,234,913 | +7.7% | 0% | $58,286,592 |
| Thrivent Financial for Lutherans | 0.86% | 2,100,457 | +1.5% | 0.1% | $54,780,000 |
| Arvin Capital Management LP | 0.85% | 2,071,200 | +27% | 13% | $54,016,896 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 0.85% | 2,067,930 | +5.9% | 0.01% | $53,931,614 |
| UBS Group AG | 0.7% | 1,710,775 | +730% | 0.01% | $44,617,011 |
| Point72 Asset Management, L.P. | 0.67% | 1,630,563 | +135% | 0.07% | $42,525,083 |
| Ruane, Cunniff & Goldfarb L.P. | 0.67% | 1,622,982 | -32% | 0.7% | $42,327,370 |
| SEGRA CAPITAL MANAGEMENT, LLC | 0.66% | 1,612,726 | +167% | 33% | $42,059,894 |
| Permian Investment Partners, LP | 0.65% | 1,567,000 | 4.5% | $40,867,360 | |
| TORONTO DOMINION BANK | 0.64% | 1,565,223 | 0.08% | $40,821,003 | |
| THOMPSON SIEGEL & WALMSLEY LLC | 0.63% | 1,525,884 | -21% | 0.7% | $39,795,000 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
7
Latest
Q1 2026
Rows shown
1-7 of 7
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 201,889,742 | $5,265,230,797 | +$195,504,203 | $26.08 | 481 |
| 2025 Q4 | 194,007,598 | $5,627,487,600 | +$52,971,670 | $29.00 | 480 |
| 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 |