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
Q2 		$3.33M Buy
160,876
+138,061
+605% +$3.34M 0.3% 60
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 $3.75B 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

Atom Investors's AMTM Position: Q2 2026 in Review

Atom Investors increased its Amentum Holdings (AMTM) stake by 605% in Q2 2026, buying an estimated $3.34M and bringing the position to 160,876 shares worth $3.33M. The position accounts for 0.3% of the portfolio, ranked #60.

Atom Investors first reported a position in AMTM in Q3 2025 and has held it in 4 quarters since. The position peaked at $3.46M in Q3 2025. 462 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Atom Investors held 160,876 shares of Amentum Holdings worth $3.33M as of Q2 2026.
  • Atom Investors bought 138,061 Amentum Holdings shares in Q2 2026, an estimated $3.34M.
  • Amentum Holdings made up 0.3% of Atom Investors's portfolio in Q2 2026, its #60 holding.
  • Atom Investors first reported a position in Amentum Holdings in Q3 2025 and has held it in 4 quarters since.
  • Atom Investors's Amentum Holdings position peaked at $3.46M in Q3 2025.
  • 462 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Atom Investors's 13F filing for Q2 2026, filed 14 Aug 2026.