Vanguard Portfolio Management
AMTM icon

Vanguard Portfolio Management’s Amentum Holdings AMTM Stock Holding History

Vanguard Portfolio 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
Q3 		$148M Buy
8,177,681
+229,296
+3% +$4.8M 0.01% 1318
2026
Q2 		$164M Buy
7,948,385
+95,434
+1% +$2.31M 0.01% 1309
2026
Q1 		$205M Buy
+7,852,951
New +$246M 0.01% 1137

Other funds holding AMTM

American Securities
American Securities New York $2.69B AUM 8.08% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return
BlackRock
BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $161B AUM 86.05% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return
Thompson Siegel & Walmsley
Thompson Siegel & Walmsley Richmond, Virginia $5.37B AUM 3.99% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

Vanguard Portfolio Management's AMTM Position: Q3 2026 in Review

Vanguard Portfolio Management increased its Amentum Holdings (AMTM) stake by 2.9% in Q3 2026, buying an estimated $4.8M and bringing the position to 8,177,681 shares worth $148M. The position accounts for 0.01% of the portfolio, ranked #1318.

Vanguard Portfolio Management first reported a position in AMTM in Q1 2026 and has held it in 3 quarters since. The position peaked at $205M in Q1 2026. 360 funds tracked by Wall St. Rank hold AMTM as of Q3 2026.

  • Vanguard Portfolio Management held 8,177,681 shares of Amentum Holdings worth $148M as of Q3 2026.
  • Vanguard Portfolio Management bought 229,296 Amentum Holdings shares in Q3 2026, an estimated $4.8M.
  • Amentum Holdings made up 0.01% of Vanguard Portfolio Management's portfolio in Q3 2026, its #1318 holding.
  • Vanguard Portfolio Management first reported a position in Amentum Holdings in Q1 2026 and has held it in 3 quarters since.
  • Vanguard Portfolio Management's Amentum Holdings position peaked at $205M in Q1 2026.
  • 360 funds tracked by Wall St. Rank held Amentum Holdings as of Q3 2026.

Based on Vanguard Portfolio Management's 13F filing for Q3 2026, filed 13 Nov 2026.