ATIA
AMTM

American Trust Investment Advisors’s Amentum Holdings AMTM Stock Holding History

American Trust Investment 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
Q1 		– Sell
-29,175
Closed -$846K – 83
2025
Q4 		$846K Sell
29,175
-1,308
-4% -$33.4K 0.45% 43
2025
Q3 		$730K Sell
30,483
-2,769
-8% -$67.4K 0.38% 45
2025
Q2 		$785K Sell
33,252
-2,436
-7% -$50.9K 0.4% 42
2025
Q1 		$650K Sell
35,688
-2,166
-6% -$44.1K 0.27% 73
2024
Q4 		$796K Sell
37,854
-560
-1% -$14.5K 0.33% 53
2024
Q3 		$1.24M Buy
+38,414
New +$1.09M 0.51% 40

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

American Trust Investment Advisors's AMTM Position: Q1 2026 in Review

American Trust Investment Advisors sold out of Amentum Holdings (AMTM) in Q1 2026, closing a stake of 29,175 shares — an estimated $846K sold.

American Trust Investment Advisors first reported a position in AMTM in Q3 2024 and held it in 6 quarters. The position peaked at $1.24M in Q3 2024. 487 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • American Trust Investment Advisors reported no remaining Amentum Holdings position as of Q1 2026 after selling out during the quarter.
  • American Trust Investment Advisors sold 29,175 Amentum Holdings shares in Q1 2026, an estimated $846K.
  • American Trust Investment Advisors first reported a position in Amentum Holdings in Q3 2024 and held it in 6 quarters.
  • American Trust Investment Advisors's Amentum Holdings position peaked at $1.24M in Q3 2024.
  • 487 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on American Trust Investment Advisors's 13F filing for Q1 2026, filed 15 May 2026.