CenterBook Partners’s Amentum Holdings AMTM Stock Holding History

CenterBook Partners’s Portfolio AMTM Stock Details AMTM Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q2	$6.8M	Buy	328,766 +185,068	+129%	+$4.48M	0.33%	65
2026 Q1	$3.75M	Sell	143,698 -78,525	-35%	-$2.46M	0.2%	131
2025 Q4	$6.44M	Sell	222,223 -85,858	-28%	-$2.19M	0.31%	83
2025 Q3	$7.38M	Buy	308,081 +182,741	+146%	+$4.45M	0.36%	64
2025 Q2	$2.96M	Sell	125,340 -289,234	-70%	-$6.04M	0.16%	163
2025 Q1	$7.55M	Buy	414,574 +343,268	+481%	+$6.99M	0.48%	55
2024 Q4	$1.5M	Buy	+71,306	New	+$1.84M	0.09%	259

Other funds holding AMTM

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

FCM

Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return

TCA

Troluce Capital Advisors Dorado, Puerto Rico $971M AUM 2.27% 1-Year Est. Return

CenterBook Partners's AMTM Position: Q2 2026 in Review

CenterBook Partners increased its Amentum Holdings (AMTM) stake by 129% in Q2 2026, buying an estimated $4.48M and bringing the position to 328,766 shares worth $6.8M. The position accounts for 0.33% of the portfolio, ranked #65.

CenterBook Partners first reported a position in AMTM in Q4 2024 and has held it in 7 quarters since. The position peaked at $7.55M in Q1 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

CenterBook Partners held 328,766 shares of Amentum Holdings worth $6.8M as of Q2 2026.
CenterBook Partners bought 185,068 Amentum Holdings shares in Q2 2026, an estimated $4.48M.
Amentum Holdings made up 0.33% of CenterBook Partners's portfolio in Q2 2026, its #65 holding.
CenterBook Partners first reported a position in Amentum Holdings in Q4 2024 and has held it in 7 quarters since.
CenterBook Partners's Amentum Holdings position peaked at $7.55M in Q1 2025.
458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on CenterBook Partners's 13F filing for Q2 2026, filed 11 Aug 2026.