Ken Griffin
AMTM

Ken Griffin’s Amentum Holdings AMTM Stock Holding History

Ken Griffin’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 		$2.1M Buy
80,638
+25,053
+45% +$786K ﹤0.01% 5966
2025
Q4 		$1.61M Sell
55,585
-62,385
-53% -$1.59M ﹤0.01% 6355
2025
Q3 		$2.83M Sell
117,970
-224,929
-66% -$5.48M ﹤0.01% 5410
2025
Q2 		$8.1M Sell
342,899
-2,583,583
-88% -$54M ﹤0.01% 3335
2025
Q1 		$53.3M Buy
2,926,482
+2,531,660
+641% +$51.6M 0.01% 1094
2024
Q4 		$8.3M Sell
394,822
-86,211
-18% -$2.23M ﹤0.01% 3217
2024
Q3 		$15.5M Buy
+481,033
New +$13.7M ﹤0.01% 2336

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 $6.73T AUM 46.02% 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 $3.37T AUM 44.26% 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 $552B AUM 44.19% 1-Year Est. Return

Ken Griffin's AMTM Position: Q1 2026 in Review

Ken Griffin increased its Amentum Holdings (AMTM) stake by 45% in Q1 2026, buying an estimated $786K and bringing the position to 80,638 shares worth $2.1M. The position accounts for ﹤0.01% of the portfolio, ranked #5966.

Ken Griffin first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $53.3M in Q1 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Ken Griffin held 80,638 shares of Amentum Holdings worth $2.1M as of Q1 2026.
  • Ken Griffin bought 25,053 Amentum Holdings shares in Q1 2026, an estimated $786K.
  • Amentum Holdings made up ﹤0.01% of Ken Griffin's portfolio in Q1 2026, its #5966 holding.
  • Ken Griffin first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • Ken Griffin's Amentum Holdings position peaked at $53.3M in Q1 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Citadel Advisors's 13F filing for Q1 2026, filed 15 May 2026.