Amentum Holdings's three largest insider shareholders as of September 29, 2026 are Alan E Goldberg (Director, 45.03Mn shares), Goldberg Employee Co-Inv. Iv L.P. Lindsay (TenPercentOwner, 45.03Mn shares), 2014 Llc Goldberg (TenPercentOwner, 45.03Mn shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Goldberg Employee Co-Inv. Iv L.P. Lindsay | TenPercentOwner | 0 | 45,026,743 | 45,026,743 | 32.8% | 12 May, 2025 |
| 2 | 2014 Llc Goldberg | TenPercentOwner | 0 | 45,026,743 | 45,026,743 | 32.8% | 12 May, 2025 |
| 3 | Alan E Goldberg | Director, TenPercentOwner | 0 | 45,026,743 | 45,026,743 | 32.8% | 12 May, 2025 |
| 4 | Steven J. Demetriou | Executive Chair | 820,476 | 0 | 820,476 | 0.6% | 19 Nov, 2025 |
| 5 | John C. Vollmer | Director | 429,842 | 0 | 429,842 | 0.3% | 10 Feb, 2026 |
| 6 | John E. Heller | Chief Executive Officer | 376,019 | 0 | 376,019 | 0.3% | 07 May, 2026 |
| 7 | Jill L Bruning | Chief Technology Officer | 197,457 | 0 | 197,457 | 0.1% | 07 May, 2026 |
| 8 | Travis Barton Johnson | Chief Financial Officer | 118,187 | 0 | 118,187 | 0.1% | 07 May, 2026 |
| 9 | Stephen A Arnette | Chief Operating Officer | 106,652 | 0 | 106,652 | 0.1% | 07 May, 2026 |
| 10 | Ralph E Eberhart | Director | 48,120 | 0 | 48,120 | 0.0% | 10 Feb, 2026 |
| 11 | Sean Thomas Mullen | Chief Growth Officer | 32,448 | 0 | 32,448 | 0.0% | 07 May, 2026 |
| 12 | Vincent K Brooks | Director | 27,462 | 0 | 27,462 | 0.0% | 10 Feb, 2026 |
| 13 | Mary Michele T St. | Chief Legal Officer Gc | 27,043 | 0 | 27,043 | 0.0% | 18 Feb, 2026 |
| 14 | Darren Burton | Chief People Officer | 23,600 | 0 | 23,600 | 0.0% | 09 Dec, 2025 |
| 15 | Sandra E. Rowland | Director | 20,073 | 0 | 20,073 | 0.0% | 10 Feb, 2026 |
| 16 | Barbara Loughran | Director | 9,662 | 0 | 9,662 | 0.0% | 10 Feb, 2026 |
| 17 | Susan Leslie Ireland | Director | 8,509 | 0 | 8,509 | 0.0% | 10 Feb, 2026 |
| 18 | Christopher M.T. Thompson | Director | 0 | 5,750 | 5,750 | 0.0% | 17 Sep, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 14 Aug, 2026 | Christopher M.T. Thompson | Director | Disposed G | 4,250 | $0.00 | $0 | 5,750 | Indirect |
| 06 May, 2026 | John E. Heller | Chief Executive Officer | Acquired M | 18,145 | — | — | 384,203 | Direct |
| 06 May, 2026 | Sean Thomas Mullen | Chief Growth Officer | Acquired M | 9,072 | — | — | 35,210 | Direct |
| 06 May, 2026 | Jill L Bruning | Chief Technology Officer | Acquired M | 9,072 | — | — | 200,188 | Direct |
| 06 May, 2026 | Stephen A Arnette | Chief Operating Officer | Acquired M | 13,609 | — | — | 109,966 | Direct |
| 06 May, 2026 | Travis Barton Johnson | Chief Financial Officer | Acquired M | 13,609 | — | — | 122,284 | Direct |
| 06 May, 2026 | Jill L Bruning | Chief Technology Officer | Disposed F | 2,731 | $24.89 | $67.97K | 197,457 | Direct |
| 06 May, 2026 | Travis Barton Johnson | Chief Financial Officer | Disposed F | 4,097 | $24.89 | $101.97K | 118,187 | Direct |
| 06 May, 2026 | Sean Thomas Mullen | Chief Growth Officer | Disposed F | 2,762 | $24.89 | $68.75K | 32,448 | Direct |
| 06 May, 2026 | John E. Heller | Chief Executive Officer | Disposed F | 8,184 | $24.89 | $203.70K | 376,019 | Direct |
| 06 May, 2026 | Stephen A Arnette | Chief Operating Officer | Disposed F | 3,314 | $24.89 | $82.49K | 106,652 | Direct |
| 06 May, 2026 | Jill L Bruning | Chief Technology Officer | Disposed M | 9,072 | $0.00 | $0 | 9,073 | Direct |
| 06 May, 2026 | Sean Thomas Mullen | Chief Growth Officer | Disposed M | 9,072 | $0.00 | $0 | 9,073 | Direct |
| 06 May, 2026 | Travis Barton Johnson | Chief Financial Officer | Disposed M | 13,609 | $0.00 | $0 | 13,609 | Direct |
| 06 May, 2026 | Stephen A Arnette | Chief Operating Officer | Disposed M | 13,609 | $0.00 | $0 | 13,609 | Direct |
| 06 May, 2026 | John E. Heller | Chief Executive Officer | Disposed M | 18,145 | $0.00 | $0 | 18,146 | Direct |
| 04 Mar, 2026 | Jill L Bruning | Chief Technology Officer | Disposed G | 30,000 | $0.00 | $0 | 190,999 | Direct |
| 02 Mar, 2026 | Stephen A Arnette | Chief Operating Officer | Acquired M | 2,808 | — | — | 97,107 | Direct |
| 02 Mar, 2026 | Stephen A Arnette | Chief Operating Officer | Disposed F | 750 | $30.70 | $23.03K | 96,357 | Direct |
| 02 Mar, 2026 | Stephen A Arnette | Chief Operating Officer | Disposed M | 2,808 | $0.00 | $0 | 0 | Direct |