CP
AMTM

Castalian Partners’s Amentum Holdings AMTM Stock Holding History

Castalian 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
2025
Q2 		– Sell
-304,500
Closed -$5.54M – 9
2025
Q1 		$5.54M Sell
304,500
-695,500
-70% -$14.2M 1.58% 6
2024
Q4 		$21M Buy
+1,000,000
New +$25.8M 10.65% 2

Other funds holding AMTM

AS
American Securities New York $3.93B AUM 52.22% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $9.73B AUM 55.65% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VanEck Associates
VanEck Associates New York $133B AUM 72.99% 1-Year Est. Return

Castalian Partners's AMTM Position: Q2 2025 in Review

Castalian Partners sold out of Amentum Holdings (AMTM) in Q2 2025, closing a stake of 304,500 shares — an estimated $5.54M sold.

Castalian Partners first reported a position in AMTM in Q4 2024 and held it in 2 quarters. The position peaked at $21M in Q4 2024. 460 funds tracked by Wall St. Rank hold AMTM as of Q2 2025.

  • Castalian Partners reported no remaining Amentum Holdings position as of Q2 2025 after selling out during the quarter.
  • Castalian Partners sold 304,500 Amentum Holdings shares in Q2 2025, an estimated $5.54M.
  • Castalian Partners first reported a position in Amentum Holdings in Q4 2024 and held it in 2 quarters.
  • Castalian Partners's Amentum Holdings position peaked at $21M in Q4 2024.
  • 460 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2025.

Based on Castalian Partners's 13F filing for Q2 2025, filed 12 Aug 2025.