Amentum Holdings, Inc. AMTM
We take great care to ensure that the data presented and summarized in this overview for Amentum Holdings, Inc. is accurate and up-to-date, based on a comprehensive analysis of 13F filing forms for institutional ownership and form 4 filings for insider transactions. Please note that this data may differ from other sources and should not be relied upon as the sole basis for investment decisions.
Latest Institutional Activity in AMTM
Top Purchases
Top Sells
About AMTM
Insider Transactions at AMTM
Insider Transaction List
View all| 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%
|
-
|
Last 12 Months Summary
Buy / Acquisition
6.69M
Shares
From
26
Insiders
| Grant, award, or other acquisition | 2.93M shares |
|---|---|
| Exercise of conversion of derivative security | 259K shares |
| Open market or private purchase | 105K shares |
| Other acquisition or disposition | 3.4M shares |
Sell / Disposition
22M
Shares
From
9
Insiders
| Payment of exercise price or tax liability | 84.6K shares |
|---|---|
| Other acquisition or disposition | 21.9M shares |