Dimensional Fund Advisors
AMTM

Dimensional Fund Advisors’s Amentum Holdings AMTM Stock Holding History

Dimensional Fund Advisors’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 		$114M Buy
5,537,696
+1,750,276
+46% +$42.3M 0.02% 1079
2026
Q1 		$98.8M Buy
3,787,420
+1,954,494
+107% +$61.3M 0.02% 1073
2025
Q4 		$53.2M Buy
1,832,926
+526,875
+40% +$13.5M 0.01% 1478
2025
Q3 		$31.3M Sell
1,306,051
-28,701
-2% -$699K 0.01% 1777
2025
Q2 		$31.5M Buy
1,334,752
+221,098
+20% +$4.62M 0.01% 1759
2025
Q1 		$20.3M Sell
1,113,654
-40,476
-4% -$824K 0.01% 1937
2024
Q4 		$24.3M Sell
1,154,130
-105,218
-8% -$2.72M 0.01% 1909
2024
Q3 		$40.5M Buy
+1,259,348
New +$35.9M 0.01% 1634

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
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

Dimensional Fund Advisors's AMTM Position: Q2 2026 in Review

Dimensional Fund Advisors increased its Amentum Holdings (AMTM) stake by 46% in Q2 2026, buying an estimated $42.3M and bringing the position to 5,537,696 shares worth $114M. The position accounts for 0.02% of the portfolio, ranked #1079.

Dimensional Fund Advisors first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. 460 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Dimensional Fund Advisors held 5,537,696 shares of Amentum Holdings worth $114M as of Q2 2026.
  • Dimensional Fund Advisors bought 1,750,276 Amentum Holdings shares in Q2 2026, an estimated $42.3M.
  • Amentum Holdings made up 0.02% of Dimensional Fund Advisors's portfolio in Q2 2026, its #1079 holding.
  • Dimensional Fund Advisors first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
  • 460 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Dimensional Fund Advisors's 13F filing for Q2 2026, filed 11 Aug 2026.