OWIM
AMTM

Old West Investment Management’s Amentum Holdings AMTM Stock Holding History

Old West Investment 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
2026
Q2 		$680K Buy
32,875
+11,108
+51% +$269K 0.07% 108
2026
Q1 		$568K Buy
21,767
+2,412
+12% +$75.7K 0.06% 107
2025
Q4 		$561K Buy
+19,355
New +$495K 0.1% 85

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

Old West Investment Management's AMTM Position: Q2 2026 in Review

Old West Investment Management increased its Amentum Holdings (AMTM) stake by 51% in Q2 2026, buying an estimated $269K and bringing the position to 32,875 shares worth $680K. The position accounts for 0.07% of the portfolio, ranked #108.

Old West Investment Management first reported a position in AMTM in Q4 2025 and has held it in 3 quarters since. 460 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Old West Investment Management held 32,875 shares of Amentum Holdings worth $680K as of Q2 2026.
  • Old West Investment Management bought 11,108 Amentum Holdings shares in Q2 2026, an estimated $269K.
  • Amentum Holdings made up 0.07% of Old West Investment Management's portfolio in Q2 2026, its #108 holding.
  • Old West Investment Management first reported a position in Amentum Holdings in Q4 2025 and has held it in 3 quarters since.
  • 460 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Old West Investment Management's 13F filing for Q2 2026, filed 6 Aug 2026.