Amentum Holdings, Inc. (AMTM)

Latest Insider Confidence Score

2026Q1

49.3
Bearish

Company insider confidence (by quarter)

2024Q3 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Lindsay Goldberg Employee Co-Inv. IV L.P. — 45,026,743 May 12, 2025
LG Co-Inv. A L.P. — 45,026,743 May 12, 2025
Lindsay Goldberg V L.P. — 45,026,743 May 12, 2025
Lindsay Goldberg Maverick Co-Inv. L.P. — 45,026,743 May 12, 2025
LG Amentum Holdings GP LLC — 45,026,743 May 12, 2025

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Mar 4, 2026 Mar 5, 2026 Bruning Jill L Chief Technology Officer Neutral 27.5 -30,000 -13.57% ✗ -
Mar 2, 2026 Mar 4, 2026 Arnette Stephen A COO Sell 48.8 -750 -0.77% ✗ $23K
Feb 17, 2026 Feb 18, 2026 St. Mary Michele T Chief Legal Officer & GC Sell 42.5 -2,308 -7.86% ✗ $69.4K
Feb 6, 2026 Feb 10, 2026 IRELAND SUSAN LESLIE Director Neutral 90.0 +5,062 146.85% ✗ -
Feb 6, 2026 Feb 10, 2026 Rowland Sandra E. Director Neutral 90.0 +5,062 33.72% ✗ -
Feb 6, 2026 Feb 10, 2026 Brooks Vincent K Director Neutral 90.0 +5,062 22.60% ✗ -
Feb 6, 2026 Feb 10, 2026 EBERHART RALPH E Director Neutral 90.0 +5,062 11.76% ✗ -
Feb 10, 2026 DEMETRIOU STEVEN J. Chair Neutral 52.5 - 0.00% ✗ -
Feb 6, 2026 Feb 10, 2026 Loughran Barbara Director Neutral 90.0 +5,062 110.04% ✗ -
Feb 6, 2026 Feb 10, 2026 Thompson Christopher M.T. Director Neutral 90.0 +5,062 21.09% ✗ -
Feb 6, 2026 Feb 10, 2026 Vollmer John C. Director Neutral 77.5 +5,062 1.19% ✗ -
Jan 28, 2026 Jan 29, 2026 Heller John E. CEO Sell 40.0 -19,768 -5.12% ✗ $705.9K
Dec 19, 2025 Heller John E. CEO Neutral 52.5 - 0.00% ✗ -
Dec 19, 2025 Bruning Jill L Chief Technology Officer Neutral 52.5 - 0.00% ✗ -
Dec 19, 2025 Arnette Stephen A COO Neutral 52.5 - 0.00% ✗ -
Dec 17, 2025 Dec 19, 2025 Mullen Sean Thomas Chief Growth Officer Sell 42.5 -4,194 -13.83% ✗ $120.2K
Dec 5, 2025 Dec 9, 2025 Burton Darren Chief People Officer Sell 46.3 -1,392 -5.57% ✗ $40.2K
Nov 17, 2025 Nov 19, 2025 Mullen Sean Thomas Chief Growth Officer Neutral 90.0 +17,817 553.84% ✗ -
Nov 17, 2025 Nov 19, 2025 Heller John E. CEO Neutral 90.0 +155,897 137.30% ✗ -
Nov 17, 2025 Nov 19, 2025 Bruning Jill L Chief Technology Officer Neutral 90.0 +17,817 526.97% ✗ -
Nov 17, 2025 Nov 19, 2025 Burton Darren Chief People Officer Neutral 90.0 +22,271 100.00% ✗ -
Nov 17, 2025 Nov 19, 2025 Johnson Travis Barton CFO Neutral 90.0 +100,220 1185.33% ✗ -
Nov 17, 2025 Nov 19, 2025 St. Mary Michele T Chief Legal Officer & GC Neutral 90.0 +22,271 100.00% ✗ -
Nov 17, 2025 Nov 19, 2025 Arnette Stephen A COO Sell 90.0 +46,482 98.39% ✗ $6.2K
Nov 17, 2025 Nov 19, 2025 DEMETRIOU STEVEN J. Chair Sell 97.5 +94,278 12.57% ✗ $367K
Nov 15, 2025 Nov 18, 2025 Arnette Stephen A COO Sell 42.5 -4,651 -2.75% ✗ $102.6K
Nov 6, 2025 Nov 10, 2025 Johnson Travis Barton CFO Sell 42.5 -3,642 -30.11% ✗ $79.4K
Nov 6, 2025 Nov 10, 2025 Bruning Jill L Chief Technology Officer Sell 46.3 -1,457 -30.12% ✗ $31.7K
Nov 6, 2025 Nov 10, 2025 Heller John E. CEO Sell 40.0 -17,868 -13.60% ✗ $389.3K
Nov 6, 2025 Nov 10, 2025 Mullen Sean Thomas Chief Growth Officer Sell 46.3 -1,621 -33.51% ✗ $35.3K
Nov 6, 2025 Nov 10, 2025 DEMETRIOU STEVEN J. Chair Sell 40.0 -28,818 -3.92% ✗ $627.9K
Nov 6, 2025 Nov 10, 2025 Arnette Stephen A COO Sell 42.5 -3,093 -8.91% ✗ $67.4K
May 8, 2025 May 12, 2025 Lindsay Goldberg Employee Co-Inv. IV L.P. 10% Owner Neutral 82.5 +1,132,839 2.58% ✗ -
May 8, 2025 May 12, 2025 GOLDBERG ALAN E Director Neutral 82.5 +1,132,839 2.58% ✗ -
May 8, 2025 May 12, 2025 Goldberg 2014 LLC 10% Owner Neutral 82.5 +1,132,839 2.58% ✗ -
May 8, 2025 May 12, 2025 Amentum Joint Venture GP LLC Director Neutral 27.5 -2,433,022 -100.00% ✗ -
Apr 8, 2025 Apr 10, 2025 Vollmer John C. Director Neutral 52.5 - 0.00% ✗ -
Apr 8, 2025 Apr 10, 2025 Brooks Vincent K Director Neutral 52.5 - 0.00% ✗ -
Apr 8, 2025 Apr 10, 2025 EBERHART RALPH E Director Neutral 52.5 - 0.00% ✗ -
Apr 8, 2025 Apr 10, 2025 Loughran Barbara Director Neutral 52.5 - 0.00% ✗ -
Apr 8, 2025 Apr 10, 2025 IRELAND SUSAN LESLIE Director Neutral 52.5 - 0.00% ✗ -
Apr 8, 2025 Apr 10, 2025 Rowland Sandra E. Director Neutral 52.5 - 0.00% ✗ -
Apr 8, 2025 Apr 10, 2025 Thompson Christopher M.T. Director Neutral 52.5 - 0.00% ✗ -
Apr 7, 2025 Apr 8, 2025 Amentum Joint Venture GP LLC Director Neutral 90.0 +2,433,022 100.00% ✗ -
Mar 17, 2025 Mar 19, 2025 St. Mary Michele T Chief Legal Officer & GC Neutral 52.5 - 0.00% ✗ -
Mar 13, 2025 Mar 17, 2025 JACOBS SOLUTIONS INC. 10% Owner Neutral 27.5 -19,464,174 -100.00% ✗ -
Mar 5, 2025 Mar 7, 2025 IRELAND SUSAN LESLIE Director Neutral 52.5 - 0.00% ✗ -
Dec 17, 2024 Mar 7, 2025 Vollmer John C. Director Neutral 90.0 +391,341 100.00% ✗ -
Sep 18, 2024 Mar 7, 2025 Brooks Vincent K Director Neutral 90.0 +6,966 100.00% ✗ -
Mar 5, 2025 Mar 7, 2025 Rowland Sandra E. Director Neutral 52.5 - 0.00% ✗ -
Sep 18, 2024 Mar 7, 2025 EBERHART RALPH E Director Neutral 90.0 +26,439 100.00% ✗ -
Sep 18, 2024 Mar 5, 2025 Arnette Stephen A COO Sell 91.3 +20,269 45.87% ✗ $10K
Feb 24, 2025 St. Mary Michele T Chief Legal Officer & GC Neutral 52.5 - 0.00% ✗ -
Feb 18, 2025 Feb 20, 2025 Loughran Barbara Director Buy 95.0 +4,600 100.00% ✗ $97.6K
Sep 18, 2024 Feb 14, 2025 DEMETRIOU STEVEN J. Chair Buy 100.0 +620,893 2636.49% ✗ $2.1M
Dec 17, 2024 Jan 30, 2025 Heller John E. CEO Neutral 90.0 +91,794 100.00% ✗ -
Dec 30, 2024 ASP Amentum Investco LP 10% Owner Neutral 52.5 - 0.00% ✗ -
Dec 27, 2024 ASP Manager Corp. 10% Owner Neutral 52.5 - 0.00% ✗ -
Dec 17, 2024 Dec 27, 2024 GOLDBERG ALAN E Director Neutral 90.0 +43,893,904 100.00% ✗ -
Dec 27, 2024 Goldberg 2014 LLC 10% Owner Neutral 52.5 - 0.00% ✗ -
Dec 27, 2024 Lindsay Goldberg Employee Co-Inv. IV L.P. 10% Owner Neutral 52.5 - 0.00% ✗ -
Dec 20, 2024 Dec 23, 2024 Mullen Sean Thomas Chief Growth Officer Neutral 52.5 - 0.00% ✗ -
Dec 17, 2024 Dec 19, 2024 Amentum Joint Venture GP LLC Director Neutral 27.5 -90,021,804 -100.00% ✗ -
Dec 5, 2024 Dec 9, 2024 Burton Darren Chief People Officer Neutral 52.5 - 0.00% ✗ -
Dec 9, 2024 Burton Darren Chief People Officer Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Heller John E. CEO Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Loughran Barbara Director Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Young Stuart Ira Chief Legal Officer Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Mullen Sean Thomas Chief Growth Officer Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 DEMETRIOU STEVEN J. Chair Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Thompson Christopher M.T. Director Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 EBERHART RALPH E Director Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 IRELAND SUSAN LESLIE Director Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Brooks Vincent K Director Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Arnette Stephen A COO Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Bruning Jill L Chief Technology Officer Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Vollmer John C. Director Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Johnson Travis Barton CFO Neutral 52.5 - 0.00% ✗ -
Nov 6, 2024 Nov 8, 2024 Rowland Sandra E. Director Neutral 52.5 - 0.00% ✗ -
Oct 2, 2024 Oct 4, 2024 DEMETRIOU STEVEN J. Chair Neutral 52.5 - 0.00% ✗ -
Oct 2, 2024 Oct 4, 2024 Arnette Stephen A COO Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 EBERHART RALPH E Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 DEMETRIOU STEVEN J. Chair Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 IRELAND SUSAN LESLIE Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Loughran Barbara Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Brooks Vincent K Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Thompson Christopher M.T. Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Rowland Sandra E. Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 GOLDBERG ALAN E Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Triedman J Russell Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Vollmer John C. Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Young Stuart Ira Chief Legal Officer Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Johnson Travis Barton CFO Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Heller John E. CEO Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Mullen Sean Thomas Chief Growth Officer Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Bruning Jill L Chief Technology Officer Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Amentum Joint Venture GP LLC Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Wentzell Connor Director Neutral 52.5 - 0.00% ✗ -
Sep 27, 2024 Dickson Benjamin Buhl Director Neutral 52.5 - 0.00% ✗ -
Sep 23, 2024 Sep 25, 2024 JACOBS SOLUTIONS INC. 10% Owner Neutral 27.5 -124,084,108 -80.95% ✗ -