Group One Trading’s Amentum Holdings AMTM Stock Holding History

Group One Trading’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	$573K	Buy	+27,710	New	+$670K	﹤0.01%	3359
2026 Q1	–	Sell	-28,498	Closed	-$894K	–	9006
2025 Q4	$826K	Buy	28,498 +7,891	+38%	+$202K	﹤0.01%	3072
2025 Q3	$494K	Sell	20,607 -47,301	-70%	-$1.15M	﹤0.01%	3722
2025 Q2	$1.6M	Sell	67,908 -36,776	-35%	-$769K	﹤0.01%	2337
2025 Q1	$1.91M	Buy	104,684 +18,648	+22%	+$380K	0.01%	1855
2024 Q4	$1.81M	Buy	86,036 +84,988	+8,110%	+$2.2M	﹤0.01%	2009
2024 Q3	$33.8K	Buy	+1,048	New	+$29.9K	﹤0.01%	4914

Other funds holding AMTM

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

TCA

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

Group One Trading's AMTM Position: Q2 2026 in Review

Group One Trading opened a new position in Amentum Holdings (AMTM) in Q2 2026: 27,710 shares worth $573K. The stake represents ﹤0.01% of the portfolio and ranks #3359 among its holdings. This is a return to the name: Group One Trading previously reported a position in AMTM as recently as Q4 2025.

Group One Trading first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $1.91M in Q1 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

Group One Trading held 27,710 shares of Amentum Holdings worth $573K as of Q2 2026.
Amentum Holdings was a new Group One Trading position in Q2 2026.
Amentum Holdings made up ﹤0.01% of Group One Trading's portfolio in Q2 2026, its #3359 holding.
Group One Trading first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
Group One Trading's Amentum Holdings position peaked at $1.91M in Q1 2025.
458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Group One Trading's 13F filing for Q2 2026, filed 14 Aug 2026.