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 Q3	$286K	Sell	15,800 -18,600	-54%	-$389K	﹤0.01%	3892
2026 Q2	$711K	Sell	34,400 -11,600	-25%	-$281K	﹤0.01%	3180
2026 Q1	$1.2M	Buy	46,000 +6,600	+17%	+$207K	﹤0.01%	2542
2025 Q4	$1.14M	Buy	39,400 +12,500	+46%	+$320K	﹤0.01%	2769
2025 Q3	$644K	Sell	26,900 -97,400	-78%	-$2.37M	﹤0.01%	3443
2025 Q2	$2.93M	Sell	124,300 -55,900	-31%	-$1.17M	0.01%	1777
2025 Q1	$3.28M	Buy	180,200 +18,500	+11%	+$377K	0.01%	1399
2024 Q4	$3.4M	Buy	+161,700	New	+$4.18M	0.01%	1457

Other funds holding AMTM

Dimensional Fund Advisors Austin, Texas $551B AUM 33.95% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return

Thompson Siegel & Walmsley Richmond, Virginia $5.37B AUM 3.99% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

UBS Group Zurich, Switzerland $765B AUM 28.39% 1-Year Est. Return

Cacti Asset Management Atlanta, Georgia $1.89B AUM 58.55% 1-Year Est. Return

Bank of New York Mellon New York $608B AUM 32.77% 1-Year Est. Return

River Road Asset Management Louisville, Kentucky $8.42B AUM 5.65% 1-Year Est. Return

Segra Capital Management Palm Beach, Florida $822M AUM 57.18% 1-Year Est. Return

Principal Financial Group Des Moines, Iowa $195B AUM 21.17% 1-Year Est. Return

Group One Trading's AMTM Position: Q3 2026 in Review

Group One Trading reduced its Amentum Holdings (AMTM) stake by 68% in Q3 2026, selling an estimated $394K and leaving 8,882 shares worth $161K. The position accounts for ﹤0.01% of the portfolio, ranked #4352.

Group One Trading first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. The position peaked at $1.91M in Q1 2025. 252 funds tracked by Wall St. Rank hold AMTM as of Q3 2026.

Group One Trading held 8,882 shares of Amentum Holdings worth $161K as of Q3 2026.
Group One Trading sold 18,828 Amentum Holdings shares in Q3 2026, an estimated $394K.
Amentum Holdings made up ﹤0.01% of Group One Trading's portfolio in Q3 2026, its #4352 holding.
Group One Trading first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
Group One Trading's Amentum Holdings position peaked at $1.91M in Q1 2025.
252 funds tracked by Wall St. Rank held Amentum Holdings as of Q3 2026.

Based on Group One Trading's 13F filing for Q3 2026, filed 10 Nov 2026.