First Manhattan
AMTM

First Manhattan’s Amentum Holdings AMTM Stock Holding History

First Manhattan’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 		$368K Hold
14,117
– – ﹤0.01% 626
2025
Q4 		$409K Sell
14,117
-83
-0.6% -$2.12K ﹤0.01% 596
2025
Q3 		$340K Sell
14,200
-1,235
-8% -$30.1K ﹤0.01% 606
2025
Q2 		$364K Sell
15,435
-574
-4% -$12K ﹤0.01% 588
2025
Q1 		$291K Sell
16,009
-1,593
-9% -$32.4K ﹤0.01% 590
2024
Q4 		$370K Buy
+17,602
New +$455K ﹤0.01% 562

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

First Manhattan's AMTM Position: Q1 2026 in Review

First Manhattan held its Amentum Holdings (AMTM) position steady in Q1 2026 at 14,117 shares worth $368K. The position accounts for ﹤0.01% of the portfolio, ranked #626.

First Manhattan first reported a position in AMTM in Q4 2024 and has held it in 6 quarters since. The position peaked at $409K in Q4 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • First Manhattan held 14,117 shares of Amentum Holdings worth $368K as of Q1 2026.
  • First Manhattan left its Amentum Holdings share count unchanged in Q1 2026.
  • Amentum Holdings made up ﹤0.01% of First Manhattan's portfolio in Q1 2026, its #626 holding.
  • First Manhattan first reported a position in Amentum Holdings in Q4 2024 and has held it in 6 quarters since.
  • First Manhattan's Amentum Holdings position peaked at $409K in Q4 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on First Manhattan's 13F filing for Q1 2026, filed 15 May 2026.