LCM
AMTM

LuminArx Capital Management’s Amentum Holdings AMTM Stock Holding History

LuminArx 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
2026
Q1 		– Sell
-15,000
Closed -$435K – 143
2025
Q4 		$435K Buy
+15,000
New +$383K 0.4% 49

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
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
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

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

LuminArx Capital Management sold out of Amentum Holdings (AMTM) in Q1 2026, closing a stake of 15,000 shares — an estimated $435K sold.

LuminArx Capital Management first reported a position in AMTM in Q4 2025 and held it in 1 quarter. The position peaked at $435K in Q4 2025. 487 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • LuminArx Capital Management reported no remaining Amentum Holdings position as of Q1 2026 after selling out during the quarter.
  • LuminArx Capital Management sold 15,000 Amentum Holdings shares in Q1 2026, an estimated $435K.
  • LuminArx Capital Management first reported a position in Amentum Holdings in Q4 2025 and held it in 1 quarter.
  • LuminArx Capital Management's Amentum Holdings position peaked at $435K in Q4 2025.
  • 487 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on LuminArx Capital Management's 13F filing for Q1 2026, filed 14 May 2026.