TC
AMTM

TwinBeech Capital’s Amentum Holdings AMTM Stock Holding History

TwinBeech Capital’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 		$2.06M Buy
+99,727
New +$2.41M 0.37% 84
2026
Q1 		– Sell
-137,453
Closed -$3.99M – 879
2025
Q4 		$3.99M Sell
137,453
-85,254
-38% -$2.18M 0.28% 109
2025
Q3 		$5.33M Buy
+222,707
New +$5.42M 0.21% 134
2025
Q2 		– Sell
-225,438
Closed -$4.1M – 1029
2025
Q1 		$4.1M Buy
+225,438
New +$4.59M 0.07% 280

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
Primecap Management
Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
State Street
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

TwinBeech Capital's AMTM Position: Q2 2026 in Review

TwinBeech Capital opened a new position in Amentum Holdings (AMTM) in Q2 2026: 99,727 shares worth $2.06M. The stake represents 0.37% of the portfolio and ranks #84 among its holdings. This is a return to the name: TwinBeech Capital previously reported a position in AMTM as recently as Q4 2025.

TwinBeech Capital first reported a position in AMTM in Q1 2025 and has held it in 4 quarters since. The position peaked at $5.33M in Q3 2025. 460 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • TwinBeech Capital held 99,727 shares of Amentum Holdings worth $2.06M as of Q2 2026.
  • Amentum Holdings was a new TwinBeech Capital position in Q2 2026.
  • Amentum Holdings made up 0.37% of TwinBeech Capital's portfolio in Q2 2026, its #84 holding.
  • TwinBeech Capital first reported a position in Amentum Holdings in Q1 2025 and has held it in 4 quarters since.
  • TwinBeech Capital's Amentum Holdings position peaked at $5.33M in Q3 2025.
  • 460 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on TwinBeech Capital's 13F filing for Q2 2026, filed 14 Aug 2026.