Wellington Management Group
AMTM

Wellington Management Group’s Amentum Holdings AMTM Stock Holding History

Wellington Management Group’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 		– Sell
-18,948
Closed -$549K – 2032
2025
Q4 		$549K Sell
18,948
-740
-4% -$18.9K ﹤0.01% 1809
2025
Q3 		$472K Sell
19,688
-41,090
-68% -$1M ﹤0.01% 1889
2025
Q2 		$1.43M Buy
+60,778
New +$1.27M ﹤0.01% 1654
2025
Q1 		– Sell
-2,333,221
Closed -$49.1M – 2069
2024
Q4 		$49.1M Buy
2,333,221
+1,398,143
+150% +$36.1M 0.01% 717
2024
Q3 		$30.2M Buy
+935,078
New +$26.6M 0.01% 843

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
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Wellington Management Group's AMTM Position: Q1 2026 in Review

Wellington Management Group sold out of Amentum Holdings (AMTM) in Q1 2026, closing a stake of 18,948 shares — an estimated $549K sold.

Wellington Management Group first reported a position in AMTM in Q3 2024 and held it in 5 quarters. The position peaked at $49.1M in Q4 2024. 487 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Wellington Management Group reported no remaining Amentum Holdings position as of Q1 2026 after selling out during the quarter.
  • Wellington Management Group sold 18,948 Amentum Holdings shares in Q1 2026, an estimated $549K.
  • Wellington Management Group first reported a position in Amentum Holdings in Q3 2024 and held it in 5 quarters.
  • Wellington Management Group's Amentum Holdings position peaked at $49.1M in Q4 2024.
  • 487 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Wellington Management Group's 13F filing for Q1 2026, filed 15 May 2026.