WG
AMTM

Winton Group’s Amentum Holdings AMTM Stock Holding History

Winton 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
Q2 		$1.21M Buy
58,393
+2,893
+5% +$70K 0.04% 465
2026
Q1 		$1.45M Sell
55,500
-45,949
-45% -$1.44M 0.05% 393
2025
Q4 		$2.94M Buy
101,449
+48,040
+90% +$1.23M 0.1% 256
2025
Q3 		$1.28M Sell
53,409
-59,012
-52% -$1.44M 0.05% 356
2025
Q2 		$2.65M Sell
112,421
-4,259
-4% -$89K 0.14% 200
2025
Q1 		$2.12M Buy
116,680
+51,932
+80% +$1.06M 0.13% 176
2024
Q4 		$1.36M Buy
+64,748
New +$1.67M 0.09% 182

Other funds holding AMTM

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
TCA
Troluce Capital Advisors Dorado, Puerto Rico $971M AUM 2.27% 1-Year Est. Return

Winton Group's AMTM Position: Q2 2026 in Review

Winton Group increased its Amentum Holdings (AMTM) stake by 5.2% in Q2 2026, buying an estimated $70K and bringing the position to 58,393 shares worth $1.21M. The position accounts for 0.04% of the portfolio, ranked #465.

Winton Group first reported a position in AMTM in Q4 2024 and has held it in 7 quarters since. The position peaked at $2.94M in Q4 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Winton Group held 58,393 shares of Amentum Holdings worth $1.21M as of Q2 2026.
  • Winton Group bought 2,893 Amentum Holdings shares in Q2 2026, an estimated $70K.
  • Amentum Holdings made up 0.04% of Winton Group's portfolio in Q2 2026, its #465 holding.
  • Winton Group first reported a position in Amentum Holdings in Q4 2024 and has held it in 7 quarters since.
  • Winton Group's Amentum Holdings position peaked at $2.94M in Q4 2025.
  • 458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

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