AMENTUM HOLDINGS INC

Ticker: AMTM CUSIP: 023939101 Class: COM

THOMPSON SIEGEL & WALMSLEY LLC's Holding History (CIK: 0001008322)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 1,921,809 Value ($000) $56 Avg Close $25.56 Range $21.11 - $31.87

Q3 2025

Shares 2,730,298 Value ($000) $65 Avg Close $24.35 Range $21.71 - $26.63

Q2 2025

Shares 2,786,913 Value ($000) $66 Avg Close $20.90 Range $16.01 - $24.33

Q1 2025

Shares 3,326,378 Value ($000) $61 Avg Close $20.37 Range $16.95 - $24.30

Q4 2024

Shares 1,948,684 Value ($000) $41 Avg Close $25.85 Range $18.38 - $34.47

Q3 2024

Shares 342,242 Value ($000) $11 Avg Close $28.49 Range $23.58 - $34.50

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	1,921,809	$56	$25.56	$21.11 - $31.87
Q3 2025	2,730,298	$65	$24.35	$21.71 - $26.63
Q2 2025	2,786,913	$66	$20.90	$16.01 - $24.33
Q1 2025	3,326,378	$61	$20.37	$16.95 - $24.30
Q4 2024	1,948,684	$41	$25.85	$18.38 - $34.47
Q3 2024	342,242	$11	$28.49	$23.58 - $34.50