Insider Transactions in Q4 2025 at Amentum Holdings, Inc. (AMTM)
Insider Transaction List (Q4 2025)
| Date | Insider | Transaction | Ownership Type | Shares Traded | Value / Price |
|---|---|---|---|---|---|
|
Dec 17
2025
|
Sean Thomas Mullen Chief Growth Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
4,194
-13.83%
|
$117,432
$28.67 P/Share
|
|
Dec 17
2025
|
Sean Thomas Mullen Chief Growth Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
9,298
+23.46%
|
-
|
|
Dec 05
2025
|
Darren Burton Chief People Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
1,392
-5.57%
|
$38,976
$28.88 P/Share
|
|
Dec 05
2025
|
Darren Burton Chief People Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
2,721
+9.82%
|
-
|
|
Nov 17
2025
|
Jill L Bruning Chief Technology Officer |
BUY
Grant, award, or other acquisition
|
Direct |
17,817
+45.67%
|
-
|
|
Nov 17
2025
|
John E. Heller Chief Executive Officer |
BUY
Grant, award, or other acquisition
|
Direct |
155,897
+36.65%
|
-
|
|
Nov 17
2025
|
Sean Thomas Mullen Chief Growth Officer |
BUY
Grant, award, or other acquisition
|
Direct |
17,817
+45.86%
|
-
|
|
Nov 17
2025
|
Travis Barton Johnson Chief Financial Officer |
BUY
Grant, award, or other acquisition
|
Direct |
100,220
+47.98%
|
-
|
|
Nov 17
2025
|
Darren Burton Chief People Officer |
BUY
Grant, award, or other acquisition
|
Direct |
22,271
+50.0%
|
-
|
|
Nov 17
2025
|
Mary Michele T St. Chief Legal Officer & GC |
BUY
Grant, award, or other acquisition
|
Direct |
22,271
+50.0%
|
-
|
|
Nov 17
2025
|
Stephen A Arnette Chief Operating Officer |
BUY
Grant, award, or other acquisition
|
Direct |
46,769
+33.29%
|
-
|
|
Nov 17
2025
|
Stephen A Arnette Chief Operating Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
287
-0.61%
|
$6,027
$21.49 P/Share
|
|
Nov 17
2025
|
Stephen A Arnette Chief Operating Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
1,178
+2.43%
|
-
|
|
Nov 17
2025
|
Steven J. Demetriou Executive Chair |
BUY
Grant, award, or other acquisition
|
Direct |
111,355
+11.95%
|
-
|
|
Nov 17
2025
|
Steven J. Demetriou Executive Chair |
SELL
Payment of exercise price or tax liability
|
Direct |
17,077
-2.35%
|
$358,617
$21.49 P/Share
|
|
Nov 17
2025
|
Steven J. Demetriou Executive Chair |
BUY
Exercise of conversion of derivative security
|
Direct |
43,396
+5.64%
|
-
|
|
Nov 16
2025
|
Stephen A Arnette Chief Operating Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
3,248
-2.48%
|
$71,456
$22.07 P/Share
|
|
Nov 16
2025
|
Stephen A Arnette Chief Operating Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
13,330
+9.21%
|
-
|
|
Nov 15
2025
|
Stephen A Arnette Chief Operating Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
1,403
-3.75%
|
$30,866
$22.07 P/Share
|
|
Nov 15
2025
|
Stephen A Arnette Chief Operating Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
5,758
+13.35%
|
-
|
|
Nov 06
2025
|
John E. Heller Chief Executive Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
17,868
-13.6%
|
$375,228
$21.79 P/Share
|
|
Nov 06
2025
|
John E. Heller Chief Executive Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
39,617
+23.16%
|
-
|
|
Nov 06
2025
|
Jill L Bruning Chief Technology Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
1,457
-30.12%
|
$30,597
$21.79 P/Share
|
|
Nov 06
2025
|
Jill L Bruning Chief Technology Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
4,838
+50.0%
|
-
|
|
Nov 06
2025
|
Travis Barton Johnson Chief Financial Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
3,642
-30.11%
|
$76,482
$21.79 P/Share
|
|
Nov 06
2025
|
Travis Barton Johnson Chief Financial Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
12,097
+50.0%
|
-
|
|
Nov 06
2025
|
Stephen A Arnette Chief Operating Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
3,093
-8.91%
|
$64,953
$21.79 P/Share
|
|
Nov 06
2025
|
Stephen A Arnette Chief Operating Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
12,701
+26.78%
|
-
|
|
Nov 06
2025
|
Steven J. Demetriou Executive Chair |
SELL
Payment of exercise price or tax liability
|
Direct |
28,818
-4.05%
|
$605,178
$21.79 P/Share
|
|
Nov 06
2025
|
Steven J. Demetriou Executive Chair |
BUY
Exercise of conversion of derivative security
|
Direct |
90,727
+11.31%
|
-
|
|
Nov 06
2025
|
Sean Thomas Mullen Chief Growth Officer |
SELL
Payment of exercise price or tax liability
|
Direct |
1,621
-33.51%
|
$34,041
$21.79 P/Share
|
|
Nov 06
2025
|
Sean Thomas Mullen Chief Growth Officer |
BUY
Exercise of conversion of derivative security
|
Direct |
4,838
+50.0%
|
-
|