AS
AMTM

American Securities’s Amentum Holdings AMTM Stock Holding History

American Securities’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 		$1.17B Hold
45,026,743
– – 29.88% 2
2025
Q4 		$1.31B Hold
45,026,743
– – 100% 1
2025
Q3 		$1.08B Hold
45,026,743
– – 100% 1
2025
Q2 		$1.06B Buy
45,026,743
+1,132,839
+3% +$23.7M 100% 1
2025
Q1 		$799M Hold
43,893,904
– – 100% 1
2024
Q4 		$923M Buy
+43,893,904
New +$1.13B 100% 1

Other funds holding AMTM

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
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

American Securities's AMTM Position: Q1 2026 in Review

American Securities held its Amentum Holdings (AMTM) position steady in Q1 2026 at 45,026,743 shares worth $1.17B. The position accounts for 29.88% of the portfolio, ranked #2.

American Securities first reported a position in AMTM in Q4 2024 and has held it in 6 quarters since. The position peaked at $1.31B in Q4 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • American Securities held 45,026,743 shares of Amentum Holdings worth $1.17B as of Q1 2026.
  • American Securities left its Amentum Holdings share count unchanged in Q1 2026.
  • Amentum Holdings made up 29.88% of American Securities's portfolio in Q1 2026, its #2 holding.
  • American Securities first reported a position in Amentum Holdings in Q4 2024 and has held it in 6 quarters since.
  • American Securities's Amentum Holdings position peaked at $1.31B in Q4 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on American Securities's 13F filing for Q1 2026, filed 14 May 2026.