JO
AMTM

John Overdeck’s Amentum Holdings AMTM Stock Holding History

John Overdeck’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 		– Sell
-20,100
Closed -$524K – 5518
2026
Q1 		$524K Buy
+20,100
New +$631K ﹤0.01% 3715

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

John Overdeck's AMTM Position: Q2 2026 in Review

John Overdeck reduced its Amentum Holdings (AMTM) stake by 68% in Q2 2026, selling an estimated $14.9M and leaving 284,268 shares worth $5.88M. The position accounts for ﹤0.01% of the portfolio, ranked #1986.

John Overdeck first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $23.5M in Q1 2026. 457 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • John Overdeck held 284,268 shares of Amentum Holdings worth $5.88M as of Q2 2026.
  • John Overdeck sold 615,909 Amentum Holdings shares in Q2 2026, an estimated $14.9M.
  • Amentum Holdings made up ﹤0.01% of John Overdeck's portfolio in Q2 2026, its #1986 holding.
  • John Overdeck first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • John Overdeck's Amentum Holdings position peaked at $23.5M in Q1 2026.
  • 457 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.