Jane Street
AMTM

Jane Street’s Amentum Holdings AMTM Stock Holding History

Jane Street’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 		$798K Sell
38,600
-52,000
-57% -$1.26M ﹤0.01% 7004
2026
Q1 		$2.36M Buy
90,600
+54,700
+152% +$1.72M ﹤0.01% 4776
2025
Q4 		$1.04M Buy
35,900
+9,300
+35% +$238K ﹤0.01% 6039
2025
Q3 		$637K Sell
26,600
-68,612
-72% -$1.67M ﹤0.01% 7317
2025
Q2 		$2.25M Sell
95,212
-143,388
-60% -$3M ﹤0.01% 4238
2025
Q1 		$4.34M Buy
238,600
+97,400
+69% +$1.98M ﹤0.01% 3140
2024
Q4 		$2.97M Buy
+141,200
New +$3.65M ﹤0.01% 3463

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

Jane Street's AMTM Position: Q2 2026 in Review

Jane Street increased its Amentum Holdings (AMTM) stake by 79% in Q2 2026, buying an estimated $3.67M and bringing the position to 343,687 shares worth $7.1M. The position accounts for ﹤0.01% of the portfolio, ranked #3242.

Jane Street first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $11M in Q1 2025. 462 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Jane Street held 343,687 shares of Amentum Holdings worth $7.1M as of Q2 2026.
  • Jane Street bought 151,708 Amentum Holdings shares in Q2 2026, an estimated $3.67M.
  • Amentum Holdings made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #3242 holding.
  • Jane Street first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • Jane Street's Amentum Holdings position peaked at $11M in Q1 2025.
  • 462 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.