AMTM

insider transactions

Amentum Holdings, Inc. — buys & sells by directors, officers and 10% owners (SEC Form 4).

30D 90D 1Y

No open-market buys or sells this period. The trades below are grants, option exercises and gifts, which carry no market price.

Net buy / sell volume

Tap or hover the chart for daily net volume. Green = net buying, red = net selling.

All transactions

Exercise·M
May 6, 26

John E. Heller KEY

Chief Executive Officer

$0

18.1K sh

Own +1814500%
Other·F
May 6, 26

John E. Heller KEY

Chief Executive Officer

$203.7K

8.2K sh · $24.89

Own -2%
Exercise·M
May 6, 26

John E. Heller KEY

Chief Executive Officer

—

18.1K sh

Own +5%
Exercise·M
May 6, 26

Sean Thomas Mullen

Chief Growth Officer

$0

9.1K sh

Own +907200%
Other·F
May 6, 26

Sean Thomas Mullen

Chief Growth Officer

$68.7K

2.8K sh · $24.89

Own -8%
Exercise·M
May 6, 26

Sean Thomas Mullen

Chief Growth Officer

—

9.1K sh

Own +35%
Exercise·M
May 6, 26

Travis Barton Johnson KEY

Chief Financial Officer

$0

13.6K sh

Own New
Other·F
May 6, 26

Travis Barton Johnson KEY

Chief Financial Officer

$102.0K

4.1K sh · $24.89

Own -3%
Exercise·M
May 6, 26

Travis Barton Johnson KEY

Chief Financial Officer

—

13.6K sh

Own +13%
Exercise·M
May 6, 26

Jill L Bruning

Chief Technology Officer

$0

9.1K sh

Own +907200%
Other·F
May 6, 26

Jill L Bruning

Chief Technology Officer

$68.0K

2.7K sh · $24.89

Own -1%
Exercise·M
May 6, 26

Jill L Bruning

Chief Technology Officer

—

9.1K sh

Own +5%
Exercise·M
May 6, 26

Stephen A Arnette

Chief Operating Officer

$0

13.6K sh

Own New
Other·F
May 6, 26

Stephen A Arnette

Chief Operating Officer

$82.5K

3.3K sh · $24.89

Own -3%
Exercise·M
May 6, 26

Stephen A Arnette

Chief Operating Officer

—

13.6K sh

Own +14%

Date▾	Insider	Role	Type	Shares	Own Δ	Price	Value
May 6, 2026	John E. Heller KEY	Chief Executive Officer	Exercise M	18.1K	+1814500%	—	$0
May 6, 2026	John E. Heller KEY	Chief Executive Officer	Other F	8.2K	-2%	$24.89	$203.7K
May 6, 2026	John E. Heller KEY	Chief Executive Officer	Exercise M	18.1K	+5%	—	—
May 6, 2026	Sean Thomas Mullen	Chief Growth Officer	Exercise M	9.1K	+907200%	—	$0
May 6, 2026	Sean Thomas Mullen	Chief Growth Officer	Other F	2.8K	-8%	$24.89	$68.7K
May 6, 2026	Sean Thomas Mullen	Chief Growth Officer	Exercise M	9.1K	+35%	—	—
May 6, 2026	Travis Barton Johnson KEY	Chief Financial Officer	Exercise M	13.6K	New	—	$0
May 6, 2026	Travis Barton Johnson KEY	Chief Financial Officer	Other F	4.1K	-3%	$24.89	$102.0K
May 6, 2026	Travis Barton Johnson KEY	Chief Financial Officer	Exercise M	13.6K	+13%	—	—
May 6, 2026	Jill L Bruning	Chief Technology Officer	Exercise M	9.1K	+907200%	—	$0
May 6, 2026	Jill L Bruning	Chief Technology Officer	Other F	2.7K	-1%	$24.89	$68.0K
May 6, 2026	Jill L Bruning	Chief Technology Officer	Exercise M	9.1K	+5%	—	—
May 6, 2026	Stephen A Arnette	Chief Operating Officer	Exercise M	13.6K	New	—	$0
May 6, 2026	Stephen A Arnette	Chief Operating Officer	Other F	3.3K	-3%	$24.89	$82.5K
May 6, 2026	Stephen A Arnette	Chief Operating Officer	Exercise M	13.6K	+14%	—	—

About AMTM insider trading

This page tracks insider transactions for Amentum Holdings, Inc. (AMTM) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.