AC
AMTM

Avenir Corporation’s Amentum Holdings AMTM Stock Holding History

Avenir Corporation’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 		$16.8M Sell
811,726
-29,373
-3% -$710K 2.04% 14
2026
Q1 		$21.9M Sell
841,099
-9,845
-1% -$309K 2.67% 12
2025
Q4 		$24.7M Sell
850,944
-11,509
-1% -$294K 2.68% 13
2025
Q3 		$20.7M Sell
862,453
-32,899
-4% -$801K 2.15% 14
2025
Q2 		$21.1M Sell
895,352
-8,810
-1% -$184K 2.17% 14
2025
Q1 		$16.5M Buy
904,162
+710,692
+367% +$14.5M 1.73% 16
2024
Q4 		$4.07M Buy
+193,470
New +$5M 0.42% 25

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

Avenir Corporation's AMTM Position: Q2 2026 in Review

Avenir Corporation reduced its Amentum Holdings (AMTM) stake by 3.5% in Q2 2026, selling an estimated $710K and leaving 811,726 shares worth $16.8M. The position accounts for 2.04% of the portfolio, ranked #14.

Avenir Corporation first reported a position in AMTM in Q4 2024 and has held it in 7 quarters since. The position peaked at $24.7M in Q4 2025. 461 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Avenir Corporation held 811,726 shares of Amentum Holdings worth $16.8M as of Q2 2026.
  • Avenir Corporation sold 29,373 Amentum Holdings shares in Q2 2026, an estimated $710K.
  • Amentum Holdings made up 2.04% of Avenir Corporation's portfolio in Q2 2026, its #14 holding.
  • Avenir Corporation first reported a position in Amentum Holdings in Q4 2024 and has held it in 7 quarters since.
  • Avenir Corporation's Amentum Holdings position peaked at $24.7M in Q4 2025.
  • 461 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Avenir Corporation's 13F filing for Q2 2026, filed 13 Aug 2026.