AI
AMTM

Atom Investors’s Amentum Holdings AMTM Stock Holding History

Atom Investors’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 		$595K Sell
22,815
-20,922
-48% -$657K 0.04% 447
2025
Q4 		$1.27M Sell
43,737
-100,544
-70% -$2.57M 0.1% 270
2025
Q3 		$3.46M Buy
+144,281
New +$3.51M 0.26% 112

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

Atom Investors's AMTM Position: Q1 2026 in Review

Atom Investors reduced its Amentum Holdings (AMTM) stake by 48% in Q1 2026, selling an estimated $657K and leaving 22,815 shares worth $595K. The position accounts for 0.04% of the portfolio, ranked #447.

Atom Investors first reported a position in AMTM in Q3 2025 and has held it in 3 quarters since. The position peaked at $3.46M in Q3 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Atom Investors held 22,815 shares of Amentum Holdings worth $595K as of Q1 2026.
  • Atom Investors sold 20,922 Amentum Holdings shares in Q1 2026, an estimated $657K.
  • Amentum Holdings made up 0.04% of Atom Investors's portfolio in Q1 2026, its #447 holding.
  • Atom Investors first reported a position in Amentum Holdings in Q3 2025 and has held it in 3 quarters since.
  • Atom Investors's Amentum Holdings position peaked at $3.46M in Q3 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Atom Investors's 13F filing for Q1 2026, filed 15 May 2026.