ECM
AMTM

Engine Capital Management’s Amentum Holdings AMTM Stock Holding History

Engine Capital Management’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
Q3 		– Sell
-635,255
Closed -$15M – 30
2025
Q2 		$15M Hold
635,255
– – 3.17% 11
2025
Q1 		$11.6M Buy
635,255
+13,855
+2% +$282K 2.19% 14
2024
Q4 		$13.1M Buy
+621,400
New +$16.1M 2.39% 16

Other funds holding AMTM

AS
American Securities New York $3.75B AUM 23.12% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 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 $169B AUM 114.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return
Kovitz Investment Group Partners
Kovitz Investment Group Partners Chicago, Illinois $4.52B AUM 31.84% 1-Year Est. Return
TSW
Thompson Siegel & Walmsley Richmond, Virginia $5.57B AUM 9.46% 1-Year Est. Return

Engine Capital Management's AMTM Position: Q3 2025 in Review

Engine Capital Management sold out of Amentum Holdings (AMTM) in Q3 2025, closing a stake of 635,255 shares — an estimated $15M sold.

Engine Capital Management first reported a position in AMTM in Q4 2024 and held it in 3 quarters. The position peaked at $15M in Q2 2025. 462 funds tracked by Wall St. Rank hold AMTM as of Q3 2025.

  • Engine Capital Management reported no remaining Amentum Holdings position as of Q3 2025 after selling out during the quarter.
  • Engine Capital Management sold 635,255 Amentum Holdings shares in Q3 2025, an estimated $15M.
  • Engine Capital Management first reported a position in Amentum Holdings in Q4 2024 and held it in 3 quarters.
  • Engine Capital Management's Amentum Holdings position peaked at $15M in Q2 2025.
  • 462 funds tracked by Wall St. Rank held Amentum Holdings as of Q3 2025.

Based on Engine Capital Management's 13F filing for Q3 2025, filed 14 Nov 2025.