6CM
AMTM

683 Capital Management’s Amentum Holdings AMTM Stock Holding History

683 Capital Management’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
2025
Q2 		– Sell
-100,000
Closed -$1.82M – 162
2025
Q1 		$1.82M Buy
+100,000
New +$2.04M 0.13% 109

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

683 Capital Management's AMTM Position: Q1 2026 in Review

683 Capital Management reduced its Amentum Holdings (AMTM) stake by 7.2% in Q1 2026, selling an estimated $1.88M and leaving 775,000 shares worth $20.2M. The position accounts for 1.05% of the portfolio, ranked #23.

683 Capital Management first reported a position in AMTM in Q4 2024 and has held it in 6 quarters since. The position peaked at $38.5M in Q2 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • 683 Capital Management held 775,000 shares of Amentum Holdings worth $20.2M as of Q1 2026.
  • 683 Capital Management sold 60,000 Amentum Holdings shares in Q1 2026, an estimated $1.88M.
  • Amentum Holdings made up 1.05% of 683 Capital Management's portfolio in Q1 2026, its #23 holding.
  • 683 Capital Management first reported a position in Amentum Holdings in Q4 2024 and has held it in 6 quarters since.
  • 683 Capital Management's Amentum Holdings position peaked at $38.5M in Q2 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on 683 Capital Management's 13F filing for Q1 2026, filed 15 May 2026.