AMTMNYSEServices-Business Services, NECFiscal year ends October 2
Amentum Holdings, Inc.
Financials through Q3 FY2026, quarter ended Jul 3, 2026Last filing: 10-Q on Aug 11, 2026
$19.48−0.04 (-0.20%)
Close on Oct 19, 2026
- Market cap
- $4.77B
- P/E (TTM)
- 23.5
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
89.6%
219M of 245M shares
Institutional holders
460
59 new, 74 sold out
Net institutional buying
8M
In Q2 2026
Insider trades, 12 months
0 buys · 0 sales
Open-market trades only
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| ASP Amentum Investco LP | 43,893,904 | 18.04% | 13D (active) | Dec 17, 2024 |
| Lindsay Goldberg Co-Inv. IV L.P. | 43,893,904 | 18.00% | 13D (active) | Dec 17, 2024 |
| Invesco Ltd. | 24,529,939 | 10.10% | 13G (passive) amendment | Apr 30, 2026 |
| BlackRock, Inc. | 16,774,241 | 6.90% | 13G (passive) amendment | Dec 31, 2024 |
| Primecap Management Co/Ca/ | 12,285,504 | 5.03% | 13G (passive) | Jun 30, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of AMTM | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| American Securities LLC | 45,026,743 | 18.42% | $930.70M | – | 24.79% |
| Invesco Ltd. | 24,954,251 | 10.21% | $515.80M | +3,480,473 | 0.04% |
| BlackRock, Inc. | 17,906,984 | 7.32% | $370.14M | +65,701 | 0.01% |
| Primecap Management Co/Ca/ | 12,285,504 | 5.02% | $253.94M | +200,210 | 0.15% |
| Legacy Advisors, LLC | 9,065,677 | 3.71% | $9.07M | +1,399 | 0.85% |
| Vanguard Portfolio Management LLC | 7,948,385 | 3.25% | $164.29M | +95,434 | 0.01% |
| Vanguard Capital Management LLC | 6,711,987 | 2.75% | $138.74M | +61,108 | 0.00% |
| FMR LLC | 5,679,175 | 2.32% | $117.39M | +100,789 | 0.01% |
| Dimensional Fund Advisors LP | 5,537,696 | 2.26% | $114.46M | +1,750,276 | 0.02% |
| State Street Corp | 5,151,772 | 2.11% | $106.49M | +72,731 | 0.00% |
| Frontier Capital Management Co LLC | 4,143,971 | 1.69% | $85.66M | −786,239 | 0.80% |
| Troluce Capital Advisors LLC | 3,565,399 | 1.46% | $73.70M | +2,565,399 | 7.59% |
| Geode Capital Management, LLC | 2,716,560 | 1.11% | $56.17M | −97,855 | 0.00% |
| Goldman Sachs Group Inc | 2,711,866 | 1.11% | $56.05M | +1,580,428 | 0.00% |
| Morgan Stanley | 2,662,329 | 1.09% | $55.03M | +427,416 | 0.00% |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 2,318,581 | 0.95% | $47.93M | −466,553 | 0.06% |
| Thompson Siegel & Walmsley LLC | 2,281,945 | 0.93% | $47.17K | +756,061 | 0.85% |
| Millennium Management LLC | 2,127,779 | 0.87% | $43.98M | +1,496,724 | 0.02% |
| Charles Schwab Investment Management Inc | 2,120,102 | 0.87% | $43.82M | +52,172 | 0.01% |
| Thrivent Financial for Lutherans | 2,105,802 | 0.86% | $43.53K | +5,345 | 0.07% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 460 | 219M | 89.6% | 59 / 148 | 158 / 74 | 26M | 18M |
| Q1 2026 | 487 | 211M | 86.3% | 71 / 151 | 152 / 61 | 36M | 13M |
| Q4 2025 | 483 | 204M | 83.4% | 88 / 133 | 158 / 57 | 27M | 17M |
| Q3 2025 | 462 | 194M | 79.2% | 76 / 104 | 179 / 69 | 14M | 22M |
| Q2 2025 | 460 | 201M | 82.1% | 112 / 233 | 100 / 65 | 24M | 15M |
| Q1 2025 | 418 | 192M | 78.6% | 73 / 112 | 151 / 95 | 42M | 16M |
| Q4 2024 | 451 | 166M | 68.0% | 145 / 95 | 157 / 183 | 97M | 31M |
| Q3 2024 | 492 | 101M | 41.2% | 492 / 0 | 0 / 0 | 101M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of AMTM | Value | % of fund | As of |
|---|---|---|---|---|---|
| iShares Core S&P Small-Cap ETF | 9,273,929 | 3.79% | $191.69M | 0.17% | Jun 30, 2026 |
| Vanguard Primecap Core Fund | 5,516,796 | 2.26% | $114.03M | 0.63% | Jun 30, 2026 |
| Vanguard Total Stock Market Index Fund | 4,653,337 | 1.90% | $96.18M | 0.00% | Jun 30, 2026 |
| Invesco Small Cap Value Fund | 4,226,948 | 1.73% | $93.84M | 0.84% | Jul 31, 2026 |
| Vanguard Small-Cap Index Fund | 3,363,425 | 1.38% | $69.52M | 0.04% | Jun 30, 2026 |
| Invesco Value Opportunities Fund | 2,945,078 | 1.20% | $65.38M | 0.72% | Jul 31, 2026 |
| Global X Defense Tech ETF | 2,691,608 | 1.10% | $62.53M | 0.78% | May 31, 2026 |
| Fidelity Value Fund | 2,662,800 | 1.09% | $59.11M | 0.56% | Jul 31, 2026 |
| Vanguard Capital Opportunity Fund | 2,506,552 | 1.03% | $51.81M | 0.16% | Jun 30, 2026 |
| Vanguard Small-Cap Value Index Fund | 2,129,618 | 0.87% | $44.02M | 0.06% | Jun 30, 2026 |
| PRIMECAP Odyssey Stock Fund | 1,879,566 | 0.77% | $41.73M | 0.91% | Jul 31, 2026 |
| Vanguard Extended Market Index Fund | 1,765,443 | 0.72% | $36.49M | 0.04% | Jun 30, 2026 |
| State Street(R) SPDR(R) Portfolio S&P 600(TM) Small Cap ETF | 1,416,757 | 0.58% | $29.28M | 0.17% | Jun 30, 2026 |
| iShares S&P Small-Cap 600 Value ETF | 1,325,120 | 0.54% | $27.39M | 0.34% | Jun 30, 2026 |
| Invesco S&P SmallCap Momentum ETF | 1,249,733 | 0.51% | $27.74M | 0.91% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| John E. Heller | Chief Executive Officer, Director | 376,019 | 0.15% | May 7, 2026 |
| Steven J. Demetriou | Executive Chair, Director | 861,218 | 0.35% | Feb 10, 2026 |
| Stephen A. Arnette | Chief Operating Officer | 106,652 | 0.04% | May 7, 2026 |
| Sean Thomas Mullen | Chief Growth Officer | 35,210 | 0.01% | May 7, 2026 |
| Travis Barton Johnson | Chief Financial Officer | 122,284 | 0.05% | May 7, 2026 |
| Jill L. Bruning | Chief Technology Officer | 197,457 | 0.08% | May 7, 2026 |
| Mary Michele T. St. | Chief Legal Officer & GC | 27,043 | 0.01% | Feb 18, 2026 |
| Darren Burton | Chief People Officer | 23,600 | 0.01% | Dec 9, 2025 |
| Stuart Ira Young | Chief Legal Officer | – | – | Nov 8, 2024 |
| Christopher M.T. Thompson | Director | 24,812 | 0.01% | Sep 17, 2026 |
| Vincent K. Brooks | Director | 22,400 | 0.01% | Feb 10, 2026 |
| Sandra E. Rowland | Director | 20,073 | 0.01% | Feb 10, 2026 |
| Susan Leslie Ireland | Director | 8,509 | 0.00% | Feb 10, 2026 |
| John C. Vollmer | Director | 424,780 | 0.17% | Feb 10, 2026 |
| Ralph E. Eberhart | Director | 43,058 | 0.02% | Feb 10, 2026 |
| Barbara Loughran | Director | 9,662 | 0.00% | Feb 10, 2026 |
| Joint Venture GP LLC Amentum | Director | 2,433,022 | 1.00% | May 12, 2025 |
| Joint Venture LP Amentum | Director | 0 | – | May 12, 2025 |
| Alan E. Goldberg | Director, 10% owner | 45,026,743 | 18.42% | May 12, 2025 |
| Goldberg IV - A. L.P. Lindsay | 10% owner | – | – | May 12, 2025 |
| Goldberg IV L.P. Lindsay | 10% owner | 45,026,743 | 18.42% | May 12, 2025 |
| Goldberg IV - PCF L.P. Lindsay | 10% owner | – | – | May 12, 2025 |
| Goldberg Maverick Co-Inv. L.P. Lindsay | 10% owner | 43,893,904 | 17.95% | May 12, 2025 |
| Goldberg Employee Co-Inv. IV L.P. Lindsay | 10% owner | – | – | May 12, 2025 |
| Amentum Holdings LP LG | 10% owner | – | – | May 12, 2025 |
| Goldberg V. L.P. Lindsay | 10% owner | 45,026,743 | 18.42% | May 12, 2025 |
| Co-Inv. A. L.P. LG | 10% owner | – | – | May 12, 2025 |
| Amentum Holdings GP LLC LG | 10% owner | – | – | May 12, 2025 |
| 2020 LLC Goldberg | 10% owner | 43,893,904 | 17.95% | May 12, 2025 |
| GP Holding IV LLC LG | 10% owner | – | – | May 12, 2025 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Christopher M.T. Thompson Director | Aug 14, 2026 | Gift | −4,250 | – | – | 5,750 |
| Sean Thomas Mullen Chief Growth Officer | May 6, 2026 | Option exercise | +9,072 | – | – | 35,210 |
| Sean Thomas Mullen Chief Growth Officer | May 6, 2026 | Tax withholding | −2,762 | $24.89 | $68.75K | 32,448 |
| John E. Heller Chief Executive Officer, Director | May 6, 2026 | Tax withholding | −8,184 | $24.89 | $203.70K | 376,019 |
| John E. Heller Chief Executive Officer, Director | May 6, 2026 | Option exercise | +18,145 | – | – | 384,203 |
| Jill L. Bruning Chief Technology Officer | May 6, 2026 | Tax withholding | −2,731 | $24.89 | $67.97K | 197,457 |
| Jill L. Bruning Chief Technology Officer | May 6, 2026 | Option exercise | +9,072 | – | – | 200,188 |
| Stephen A. Arnette Chief Operating Officer | May 6, 2026 | Tax withholding | −3,314 | $24.89 | $82.49K | 106,652 |
| Stephen A. Arnette Chief Operating Officer | May 6, 2026 | Option exercise | +13,609 | – | – | 109,966 |
| Travis Barton Johnson Chief Financial Officer | May 6, 2026 | Option exercise | +13,609 | – | – | 122,284 |
| Travis Barton Johnson Chief Financial Officer | May 6, 2026 | Tax withholding | −4,097 | $24.89 | $101.97K | 118,187 |
| Jill L. Bruning Chief Technology Officer | Mar 4, 2026 | Gift | −30,000 | – | – | 190,999 |
| Stephen A. Arnette Chief Operating Officer | Mar 2, 2026 | Option exercise | +2,808 | – | – | 97,107 |
| Stephen A. Arnette Chief Operating Officer | Mar 2, 2026 | Tax withholding | −750 | $30.70 | $23.03K | 96,357 |
| Mary Michele T. St. Chief Legal Officer & GC | Feb 17, 2026 | Tax withholding | −2,308 | $30.05 | $69.36K | 27,043 |
| Mary Michele T. St. Chief Legal Officer & GC | Feb 17, 2026 | Option exercise | +7,080 | – | – | 29,351 |
| John C. Vollmer Director | Feb 6, 2026 | Option exercise | +11,564 | – | – | 424,780 |
| John C. Vollmer Director | Feb 6, 2026 | Award | +5,062 | – | – | 429,842 |
| Barbara Loughran Director | Feb 6, 2026 | Award | +5,062 | – | – | 9,662 |
| Christopher M.T. Thompson Director | Feb 6, 2026 | Award | +5,062 | – | – | 5,062 |
| Susan Leslie Ireland Director | Feb 6, 2026 | Award | +5,062 | – | – | 8,509 |
| Sandra E. Rowland Director | Feb 6, 2026 | Award | +5,062 | – | – | 20,073 |
| Sandra E. Rowland Director | Feb 6, 2026 | Option exercise | +11,564 | – | – | 15,011 |
| Ralph E. Eberhart Director | Feb 6, 2026 | Option exercise | +11,564 | – | – | 43,058 |
| Ralph E. Eberhart Director | Feb 6, 2026 | Award | +5,062 | – | – | 48,120 |
| Vincent K. Brooks Director | Feb 6, 2026 | Option exercise | +11,564 | – | – | 22,400 |
| Vincent K. Brooks Director | Feb 6, 2026 | Award | +5,062 | – | – | 27,462 |
| John E. Heller Chief Executive Officer, Director | Jan 28, 2026 | Tax withholding | −19,768 | $35.71 | $705.92K | 366,058 |
| John E. Heller Chief Executive Officer, Director | Jan 28, 2026 | Option exercise | +51,979 | – | – | 385,826 |
| Sean Thomas Mullen Chief Growth Officer | Dec 17, 2025 | Option exercise | +9,298 | – | – | 30,332 |
| Sean Thomas Mullen Chief Growth Officer | Dec 17, 2025 | Tax withholding | −4,194 | $28.67 | $120.24K | 26,138 |
| Darren Burton Chief People Officer | Dec 5, 2025 | Tax withholding | −1,392 | $28.88 | $40.20K | 23,600 |
| Darren Burton Chief People Officer | Dec 5, 2025 | Option exercise | +2,721 | – | – | 24,992 |
| Darren Burton Chief People Officer | Nov 17, 2025 | Award | +22,271 | – | – | 22,271 |
| Steven J. Demetriou Executive Chair, Director | Nov 17, 2025 | Tax withholding | −17,077 | $21.49 | $366.98K | 709,121 |
| Steven J. Demetriou Executive Chair, Director | Nov 17, 2025 | Award | +111,355 | – | – | 820,476 |
| Steven J. Demetriou Executive Chair, Director | Nov 17, 2025 | Option exercise | +43,396 | – | – | 726,198 |
| John E. Heller Chief Executive Officer, Director | Nov 17, 2025 | Award | +155,897 | – | – | 269,440 |
| Sean Thomas Mullen Chief Growth Officer | Nov 17, 2025 | Award | +17,817 | – | – | 21,034 |
| Jill L. Bruning Chief Technology Officer | Nov 17, 2025 | Award | +17,817 | – | – | 21,198 |
| Travis Barton Johnson Chief Financial Officer | Nov 17, 2025 | Award | +100,220 | – | – | 108,675 |
| Stephen A. Arnette Chief Operating Officer | Nov 17, 2025 | Award | +46,769 | – | – | 93,725 |
| Stephen A. Arnette Chief Operating Officer | Nov 17, 2025 | Option exercise | +1,178 | – | – | 47,243 |
| Stephen A. Arnette Chief Operating Officer | Nov 17, 2025 | Tax withholding | −287 | $21.49 | $6.17K | 46,956 |
| Mary Michele T. St. Chief Legal Officer & GC | Nov 17, 2025 | Award | +22,271 | – | – | 22,271 |
| Stephen A. Arnette Chief Operating Officer | Nov 16, 2025 | Option exercise | +5,053 | – | – | 41,036 |
| Stephen A. Arnette Chief Operating Officer | Nov 16, 2025 | Option exercise | +4,596 | – | – | 47,185 |
| Stephen A. Arnette Chief Operating Officer | Nov 16, 2025 | Tax withholding | −897 | $22.07 | $19.80K | 42,589 |
| Stephen A. Arnette Chief Operating Officer | Nov 16, 2025 | Option exercise | +3,681 | – | – | 43,486 |
| Stephen A. Arnette Chief Operating Officer | Nov 16, 2025 | Tax withholding | −1,231 | $22.07 | $27.17K | 39,805 |
| Stephen A. Arnette Chief Operating Officer | Nov 16, 2025 | Tax withholding | −1,120 | $22.07 | $24.72K | 46,065 |
| Stephen A. Arnette Chief Operating Officer | Nov 15, 2025 | Option exercise | +5,758 | – | – | 37,386 |
| Stephen A. Arnette Chief Operating Officer | Nov 15, 2025 | Tax withholding | −1,403 | $22.07 | $30.96K | 35,983 |
| Stephen A. Arnette Chief Operating Officer | Nov 6, 2025 | Tax withholding | −3,093 | $21.79 | $67.40K | 31,628 |
| Stephen A. Arnette Chief Operating Officer | Nov 6, 2025 | Option exercise | +12,701 | – | – | 34,721 |
| Jill L. Bruning Chief Technology Officer | Nov 6, 2025 | Tax withholding | −1,457 | $21.79 | $31.75K | 3,381 |
| Jill L. Bruning Chief Technology Officer | Nov 6, 2025 | Option exercise | +4,838 | – | – | 4,838 |
| Sean Thomas Mullen Chief Growth Officer | Nov 6, 2025 | Tax withholding | −1,621 | $21.79 | $35.32K | 3,217 |
| Sean Thomas Mullen Chief Growth Officer | Nov 6, 2025 | Option exercise | +4,838 | – | – | 4,838 |
| Travis Barton Johnson Chief Financial Officer | Nov 6, 2025 | Option exercise | +12,097 | – | – | 12,097 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.