HI
AMTM

Horizon Investments’s Amentum Holdings AMTM Stock Holding History

Horizon Investments’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 		$97.1K Buy
+3,723
New +$117K ﹤0.01% 1083
2025
Q4 		– Sell
-16
Closed -$383 – 1402
2025
Q3 		$383 Sell
16
-97
-86% -$2.36K ﹤0.01% 1150
2025
Q2 		$2.67K Buy
+113
New +$2.36K ﹤0.01% 1018
2025
Q1 		– Sell
-1,712
Closed -$36K – 934
2024
Q4 		$36K Buy
+1,712
New +$44.3K ﹤0.01% 654

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

Horizon Investments's AMTM Position: Q1 2026 in Review

Horizon Investments opened a new position in Amentum Holdings (AMTM) in Q1 2026: 3,723 shares worth $97.1K. The stake represents ﹤0.01% of the portfolio and ranks #1083 among its holdings. This is a return to the name: Horizon Investments previously reported a position in AMTM as recently as Q3 2025.

Horizon Investments first reported a position in AMTM in Q4 2024 and has held it in 4 quarters since. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Horizon Investments held 3,723 shares of Amentum Holdings worth $97.1K as of Q1 2026.
  • Amentum Holdings was a new Horizon Investments position in Q1 2026.
  • Amentum Holdings made up ﹤0.01% of Horizon Investments's portfolio in Q1 2026, its #1083 holding.
  • Horizon Investments first reported a position in Amentum Holdings in Q4 2024 and has held it in 4 quarters since.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Horizon Investments's 13F filing for Q1 2026, filed 15 May 2026.