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
Q2 		$91.1K Buy
4,407
+684
+18% +$16.5K ﹤0.01% 1123
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 $3.75B 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 $3.38T AUM 44.17% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return

Horizon Investments's AMTM Position: Q2 2026 in Review

Horizon Investments increased its Amentum Holdings (AMTM) stake by 18% in Q2 2026, buying an estimated $16.5K and bringing the position to 4,407 shares worth $91.1K. The position accounts for ﹤0.01% of the portfolio, ranked #1123.

Horizon Investments first reported a position in AMTM in Q4 2024 and has held it in 5 quarters since. The position peaked at $97.1K in Q1 2026. 464 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Horizon Investments held 4,407 shares of Amentum Holdings worth $91.1K as of Q2 2026.
  • Horizon Investments bought 684 Amentum Holdings shares in Q2 2026, an estimated $16.5K.
  • Amentum Holdings made up ﹤0.01% of Horizon Investments's portfolio in Q2 2026, its #1123 holding.
  • Horizon Investments first reported a position in Amentum Holdings in Q4 2024 and has held it in 5 quarters since.
  • Horizon Investments's Amentum Holdings position peaked at $97.1K in Q1 2026.
  • 464 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Horizon Investments's 13F filing for Q2 2026, filed 13 Aug 2026.