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
Q1 		$3.63M Buy
139,300
+64,100
+85% +$2.01M ﹤0.01% 4011
2025
Q4 		$2.18M Sell
75,200
-19,120
-20% -$489K ﹤0.01% 4651
2025
Q3 		$2.26M Sell
94,320
-1,624
-2% -$39.5K ﹤0.01% 4715
2025
Q2 		$2.27M Sell
95,944
-241,556
-72% -$5.05M ﹤0.01% 4232
2025
Q1 		$6.14M Buy
337,500
+173,000
+105% +$3.52M ﹤0.01% 2617
2024
Q4 		$3.46M Buy
+164,500
New +$4.25M ﹤0.01% 3204

Other funds holding AMTM

AS
American Securities New York $3.93B AUM 52.22% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $9.73B AUM 55.65% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Jane Street's AMTM Position: Q1 2026 in Review

Jane Street increased its Amentum Holdings (AMTM) stake by 1,676% in Q1 2026, buying an estimated $5.68M and bringing the position to 191,979 shares worth $5.01M. The position accounts for ﹤0.01% of the portfolio, ranked #3516.

Jane Street first reported a position in AMTM in Q3 2024 and has held it in 6 quarters since. The position peaked at $11M in Q1 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Jane Street held 191,979 shares of Amentum Holdings worth $5.01M as of Q1 2026.
  • Jane Street bought 181,170 Amentum Holdings shares in Q1 2026, an estimated $5.68M.
  • Amentum Holdings made up ﹤0.01% of Jane Street's portfolio in Q1 2026, its #3516 holding.
  • Jane Street first reported a position in Amentum Holdings in Q3 2024 and has held it in 6 quarters since.
  • Jane Street's Amentum Holdings position peaked at $11M in Q1 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Jane Street's 13F filing for Q1 2026, filed 12 May 2026.