JY
AMTM

Jeff Yass’s Amentum Holdings AMTM Stock Holding History

Jeff Yass’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 		$10.7M Buy
516,500
+88,100
+21% +$2.13M ﹤0.01% 3296
2026
Q1 		$11.2M Buy
428,400
+7,700
+2% +$242K ﹤0.01% 2945
2025
Q4 		$12.2M Buy
420,700
+131,600
+46% +$3.36M ﹤0.01% 2800
2025
Q3 		$6.92M Sell
289,100
-99,000
-26% -$2.41M ﹤0.01% 3576
2025
Q2 		$9.16M Sell
388,100
-425,000
-52% -$8.88M ﹤0.01% 2954
2025
Q1 		$14.8M Buy
813,100
+119,200
+17% +$2.43M ﹤0.01% 2062
2024
Q4 		$14.6M Buy
+693,900
New +$17.9M ﹤0.01% 2199

Other funds holding AMTM

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
TCA
Troluce Capital Advisors Dorado, Puerto Rico $971M AUM 2.27% 1-Year Est. Return

Jeff Yass's AMTM Position: Q2 2026 in Review

Jeff Yass increased its Amentum Holdings (AMTM) stake by 0.73% in Q2 2026, buying an estimated $58.1K and bringing the position to 332,452 shares worth $6.87M. The position accounts for ﹤0.01% of the portfolio, ranked #4028.

Jeff Yass first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $18.4M in Q4 2024. 457 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Jeff Yass held 332,452 shares of Amentum Holdings worth $6.87M as of Q2 2026.
  • Jeff Yass bought 2,403 Amentum Holdings shares in Q2 2026, an estimated $58.1K.
  • Amentum Holdings made up ﹤0.01% of Jeff Yass's portfolio in Q2 2026, its #4028 holding.
  • Jeff Yass first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • Jeff Yass's Amentum Holdings position peaked at $18.4M in Q4 2024.
  • 457 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Susquehanna International Group's 13F filing for Q2 2026, filed 14 Aug 2026.