HI
AMTM

Harbour Investments’s Amentum Holdings AMTM Stock Holding History

Harbour 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 		$23.3K Buy
892
+890
+44,500% +$27.9K ﹤0.01% 2790
2025
Q4 		$58 Sell
2
-29
-94% -$741 ﹤0.01% 3777
2025
Q3 		$742 Sell
31
-248
-89% -$6.04K ﹤0.01% 3458
2025
Q2 		$6.59K Buy
279
+251
+896% +$5.25K ﹤0.01% 2760
2025
Q1 		$510 Hold
28
– – ﹤0.01% 3337
2024
Q4 		$589 Hold
28
– – ﹤0.01% 3254
2024
Q3 		$903 Buy
+28
New +$798 ﹤0.01% 3109

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

Harbour Investments's AMTM Position: Q1 2026 in Review

Harbour Investments increased its Amentum Holdings (AMTM) stake by 44,500% in Q1 2026, buying an estimated $27.9K and bringing the position to 892 shares worth $23.3K. The position accounts for ﹤0.01% of the portfolio, ranked #2790.

Harbour Investments first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Harbour Investments held 892 shares of Amentum Holdings worth $23.3K as of Q1 2026.
  • Harbour Investments bought 890 Amentum Holdings shares in Q1 2026, an estimated $27.9K.
  • Amentum Holdings made up ﹤0.01% of Harbour Investments's portfolio in Q1 2026, its #2790 holding.
  • Harbour Investments first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

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