Oppenheimer & Co’s Amentum Holdings AMTM Stock Holding History

Oppenheimer & Co’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	$2.96M	Sell	142,974 -25,898	-15%	-$626K	0.03%	514
2026 Q1	$4.4M	Buy	+168,872	New	+$5.3M	0.05%	368
2025 Q4	–	Sell	-75,483	Closed	-$1.81M	–	1761
2025 Q3	$1.81M	Buy	75,483 +66,320	+724%	+$1.61M	0.02%	644
2025 Q2	$216K	Buy	+9,163	New	+$191K	﹤0.01%	1472
2025 Q1	–	Sell	-10,621	Closed	-$223K	–	1687
2024 Q4	$223K	Sell	10,621 -35,012	-77%	-$905K	﹤0.01%	1412
2024 Q3	$1.47M	Buy	+45,633	New	+$1.3M	0.02%	649

Other funds holding AMTM

American Securities New York $3.75B AUM 23.12% 1-Year Est. Return

Invesco Atlanta, Georgia $1.26T AUM 61.52% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

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

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

Oppenheimer & Co's AMTM Position: Q2 2026 in Review

Oppenheimer & Co reduced its Amentum Holdings (AMTM) stake by 15% in Q2 2026, selling an estimated $626K and leaving 142,974 shares worth $2.96M. The position accounts for 0.03% of the portfolio, ranked #514.

Oppenheimer & Co first reported a position in AMTM in Q3 2024 and has held it in 6 quarters since. The position peaked at $4.4M in Q1 2026. 462 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

Oppenheimer & Co held 142,974 shares of Amentum Holdings worth $2.96M as of Q2 2026.
Oppenheimer & Co sold 25,898 Amentum Holdings shares in Q2 2026, an estimated $626K.
Amentum Holdings made up 0.03% of Oppenheimer & Co's portfolio in Q2 2026, its #514 holding.
Oppenheimer & Co first reported a position in Amentum Holdings in Q3 2024 and has held it in 6 quarters since.
Oppenheimer & Co's Amentum Holdings position peaked at $4.4M in Q1 2026.
462 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Oppenheimer & Co's 13F filing for Q2 2026, filed 3 Aug 2026.