FCM
AMTM

Frontier Capital Management’s Amentum Holdings AMTM Stock Holding History

Frontier 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 		$129M Sell
4,930,210
-842,766
-15% -$26.4M 1.32% 7
2025
Q4 		$167M Buy
5,772,976
+570,296
+11% +$14.6M 1.78% 2
2025
Q3 		$125M Sell
5,202,680
-258,063
-5% -$6.28M 1.12% 14
2025
Q2 		$129M Buy
5,460,743
+1,882,011
+53% +$39.3M 1.19% 6
2025
Q1 		$65.1M Buy
+3,578,732
New +$72.9M 0.71% 35

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
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

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

Frontier Capital Management reduced its Amentum Holdings (AMTM) stake by 15% in Q1 2026, selling an estimated $26.4M and leaving 4,930,210 shares worth $129M. The position accounts for 1.32% of the portfolio, ranked #7.

Frontier Capital Management first reported a position in AMTM in Q1 2025 and has held it in 5 quarters since. The position peaked at $167M in Q4 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Frontier Capital Management held 4,930,210 shares of Amentum Holdings worth $129M as of Q1 2026.
  • Frontier Capital Management sold 842,766 Amentum Holdings shares in Q1 2026, an estimated $26.4M.
  • Amentum Holdings made up 1.32% of Frontier Capital Management's portfolio in Q1 2026, its #7 holding.
  • Frontier Capital Management first reported a position in Amentum Holdings in Q1 2025 and has held it in 5 quarters since.
  • Frontier Capital Management's Amentum Holdings position peaked at $167M in Q4 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

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