Citadel Advisors
AMTM

Citadel Advisors’s Amentum Holdings AMTM Stock Holding History

Citadel Advisors’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 		$13.9M Buy
670,684
+590,046
+732% +$14.3M ﹤0.01% 3066
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 $3.75B 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

Citadel Advisors's AMTM Position: Q2 2026 in Review

Citadel Advisors increased its Amentum Holdings (AMTM) stake by 732% in Q2 2026, buying an estimated $14.3M and bringing the position to 670,684 shares worth $13.9M. The position accounts for ﹤0.01% of the portfolio, ranked #3066.

Citadel Advisors first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. The position peaked at $53.3M in Q1 2025. 462 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Citadel Advisors held 670,684 shares of Amentum Holdings worth $13.9M as of Q2 2026.
  • Citadel Advisors bought 590,046 Amentum Holdings shares in Q2 2026, an estimated $14.3M.
  • Amentum Holdings made up ﹤0.01% of Citadel Advisors's portfolio in Q2 2026, its #3066 holding.
  • Citadel Advisors first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
  • Citadel Advisors's Amentum Holdings position peaked at $53.3M in Q1 2025.
  • 462 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Citadel Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.