Grantham, Mayo, Van Otterloo & Co (GMO)
AMTM

Grantham, Mayo, Van Otterloo & Co (GMO)’s Amentum Holdings AMTM Stock Holding History

Grantham, Mayo, Van Otterloo & Co (GMO)’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 		$446K Buy
+21,601
New +$522K ﹤0.01% 573
2026
Q1 		– Sell
-10,457
Closed -$303K – 737
2025
Q4 		$303K Hold
10,457
– – ﹤0.01% 612
2025
Q3 		$250K Buy
+10,457
New +$255K ﹤0.01% 572

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
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

Grantham, Mayo, Van Otterloo & Co (GMO)'s AMTM Position: Q2 2026 in Review

Grantham, Mayo, Van Otterloo & Co (GMO) opened a new position in Amentum Holdings (AMTM) in Q2 2026: 21,601 shares worth $446K. The stake represents ﹤0.01% of the portfolio and ranks #573 among its holdings. This is a return to the name: Grantham, Mayo, Van Otterloo & Co (GMO) previously reported a position in AMTM as recently as Q4 2025.

Grantham, Mayo, Van Otterloo & Co (GMO) first reported a position in AMTM in Q3 2025 and has held it in 3 quarters since. 462 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Grantham, Mayo, Van Otterloo & Co (GMO) held 21,601 shares of Amentum Holdings worth $446K as of Q2 2026.
  • Amentum Holdings was a new Grantham, Mayo, Van Otterloo & Co (GMO) position in Q2 2026.
  • Amentum Holdings made up ﹤0.01% of Grantham, Mayo, Van Otterloo & Co (GMO)'s portfolio in Q2 2026, its #573 holding.
  • Grantham, Mayo, Van Otterloo & Co (GMO) first reported a position in Amentum Holdings in Q3 2025 and has held it in 3 quarters since.
  • 462 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Grantham, Mayo, Van Otterloo & Co (GMO)'s 13F filing for Q2 2026, filed 13 Aug 2026.