BlackRock
AMTM

BlackRock’s Amentum Holdings AMTM Stock Holding History

BlackRock’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 		$370M Buy
17,906,984
+65,701
+0.4% +$1.59M 0.01% 1423
2026
Q1 		$465M Buy
17,841,283
+382,184
+2% +$12M 0.01% 1162
2025
Q4 		$506M Sell
17,459,099
-531,350
-3% -$13.6M 0.01% 1100
2025
Q3 		$431M Sell
17,990,449
-1,004,634
-5% -$24.5M 0.01% 1191
2025
Q2 		$448M Buy
18,995,083
+746,094
+4% +$15.6M 0.01% 1124
2025
Q1 		$332M Buy
18,248,989
+1,474,218
+9% +$30M 0.01% 1280
2024
Q4 		$353M Buy
16,774,771
+7,857,343
+88% +$203M 0.01% 1318
2024
Q3 		$288M Buy
+8,917,428
New +$254M 0.01% 1446

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
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 $3.37T AUM 44.26% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return
TCA
Troluce Capital Advisors Dorado, Puerto Rico $971M AUM 2.27% 1-Year Est. Return

BlackRock's AMTM Position: Q2 2026 in Review

BlackRock increased its Amentum Holdings (AMTM) stake by 0.37% in Q2 2026, buying an estimated $1.59M and bringing the position to 17,906,984 shares worth $370M. The position accounts for 0.01% of the portfolio, ranked #1423.

BlackRock first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. The position peaked at $506M in Q4 2025. 460 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • BlackRock held 17,906,984 shares of Amentum Holdings worth $370M as of Q2 2026.
  • BlackRock bought 65,701 Amentum Holdings shares in Q2 2026, an estimated $1.59M.
  • Amentum Holdings made up 0.01% of BlackRock's portfolio in Q2 2026, its #1423 holding.
  • BlackRock first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
  • BlackRock's Amentum Holdings position peaked at $506M in Q4 2025.
  • 460 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on BlackRock's 13F filing for Q2 2026, filed 7 Aug 2026.