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Amentum Hldgs (AMTM)
NYSE
$21.52-$0.25 (-1.13%)
Price as of Oct 23, 2026 7:59 PM EDT- $5.2BMarket Cap
- -3.50%1-Year Change
- Specialty Business ServicesIndustry
Amentum Hldgs (AMTM)
$21.52-$0.25 (-1.13%)
Top Holders
Institutional
Mutual Funds
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
AMERICAN SECURITIES LLC | 18.42% | 45.0M | 0 (0.00%) | Jun 30, 2026 |
INVESCO LTD. | 10.21% | 25.0M | +3.5M (+13.95%) | Jun 30, 2026 |
BLACKROCK, INC. | 7.32% | 17.9M | +65,701 (+0.37%) | Jun 30, 2026 |
BLACKROCK FUNDING, INC. /DE | 6.86% | 16.8M | +7.9M (+46.84%) | Dec 31, 2024 |
VANGUARD GROUP INC | 6.30% | 15.4M | -142,946 (-0.93%) | Dec 31, 2025 |
PRIMECAP MANAGEMENT CO/CA/ | 5.02% | 12.3M | +200,210 (+1.63%) | Jun 30, 2026 |
VANGUARD PORTFOLIO MANAGEMENT LLC | 3.25% | 7.9M | +95,434 (+1.20%) | Jun 30, 2026 |
Holder | Ownership %
| Shares Held | Change (Shares, %) | Report Date |
|---|---|---|---|---|
VANGUARD INDEX FUNDS | 4.87% | 11.9M | +26,824 (+0.23%) | Jun 30, 2026 |
AIM SECTOR FUNDS (INVESCO SECTOR FUNDS) | 2.93% | 7.2M | 0 (0.00%) | Jul 31, 2026 |
VANGUARD FENWAY FUNDS | 2.26% | 5.5M | +246,677 (+4.47%) | Jun 30, 2026 |
FIDELITY CAPITAL TRUST | 1.47% | 3.6M | +925,781 (+25.69%) | Jul 31, 2026 |
PRIMECAP Odyssey Funds | 1.32% | 3.2M | +24,529 (+0.76%) | Jul 31, 2026 |
Dimensional ETF Trust | 1.16% | 2.8M | +831,618 (+29.31%) | Jul 31, 2026 |
INVESCO EXCHANGE-TRADED FUND TRUST | 1.10% | 2.7M | +158,388 (+5.91%) | Jul 31, 2026 |
Current Ownership Distribution
- Institutions1.4B (67.38%)
- Mutual Funds453.2M (21.82%)
- Insiders224.3M (10.80%)
- Other0 (0.00%)
Insider Transactions
- 10.80% (224.3M)Current InsiderOwnership (%, shares)
- 0Number of InsiderBuying (last 12 months)
- $0.00Amount of InsiderBuying (last 12 months)
- 0Number of InsiderSelling (last 12 months)
- $0.00Amount of InsiderSelling (last 12 months)
Insider Name & Title | Type | Date
| Transaction Value | Shares | Share Price | Shares After Transactions |
|---|---|---|---|---|---|---|
Thompson Christopher M.T. | Gift | Aug 14, 2026 | $0.00 | 4,250 | $0.00 | 5,750 |
Goldberg 2014 LLC | Other | May 08, 2025 | $0.00 | 1.1M | $0.00 | 45.0M |
Lindsay Goldberg Employee Co-Inv. IV L.P. | Other | May 08, 2025 | $0.00 | 1.1M | $0.00 | 45.0M |
GOLDBERG ALAN E | Other | May 08, 2025 | $0.00 | 1.1M | $0.00 | 45.0M |
Amentum Joint Venture GP LLC | Other | May 08, 2025 | $0.00 | 2.4M | $0.00 | 0 |
Thompson Christopher M.T. | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
Loughran Barbara | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
IRELAND SUSAN LESLIE | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
Brooks Vincent K | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
EBERHART RALPH E | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
Rowland Sandra E. | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
Vollmer John C. | Award | Apr 08, 2025 | $0.00 | 11,564 | $0.00 | 11,564 |
Amentum Joint Venture GP LLC | Award | Apr 07, 2025 | $0.00 | 2.4M | $0.00 | 2.4M |
JACOBS SOLUTIONS INC. | Other | Mar 13, 2025 | $0.00 | 19.5M | $0.00 | 0 |
Brooks Vincent K | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 0 |
EBERHART RALPH E | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 0 |
IRELAND SUSAN LESLIE | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 0 |
Vollmer John C. | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 0 |
Rowland Sandra E. | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 0 |
EBERHART RALPH E | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 29,886 |
IRELAND SUSAN LESLIE | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 3,447 |
Vollmer John C. | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 394,788 |
Brooks Vincent K | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 10,413 |
Rowland Sandra E. | Exempt | Mar 05, 2025 | $0.00 | 3,447 | $0.00 | 3,447 |
Loughran Barbara | Buy | Feb 18, 2025 | $97,635.00 | 4,600 | $21.23 | 4,600 |
DEMETRIOU STEVEN J. Executive Chair | Buy | Feb 12, 2025 | $2.1M | 100,000 | $20.81 | 620,893 |
Heller John E. Chief Executive Officer | Award | Jan 28, 2025 | $0.00 | 1.4M | $0.00 | 1.4M |
Heller John E. Chief Executive Officer | Award | Jan 28, 2025 | $0.00 | 155,938 | $0.00 | 155,938 |
Mullen Sean Thomas Chief Growth Officer | Award | Dec 20, 2024 | $0.00 | 9,298 | $0.00 | 9,298 |
Vollmer John C. | Other | Dec 17, 2024 | $0.00 | 391,341 | $0.00 | 391,341 |