Morgan Stanley’s Amentum Holdings AMTM Stock Holding History

Morgan Stanley’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	$55M	Buy	2,662,329 +427,416	+19%	+$10.3M	﹤0.01%	2128
2026 Q1	$58.3M	Buy	2,234,913 +159,561	+8%	+$5.01M	﹤0.01%	1940
2025 Q4	$60.2M	Buy	2,075,352 +268,935	+15%	+$6.87M	﹤0.01%	1912
2025 Q3	$43.3M	Sell	1,806,417 -370,805	-17%	-$9.03M	﹤0.01%	2130
2025 Q2	$51.4M	Buy	2,177,222 +84,374	+4%	+$1.76M	﹤0.01%	1910
2025 Q1	$38.1M	Buy	2,092,848 +610,327	+41%	+$12.4M	﹤0.01%	2064
2024 Q4	$31.2M	Buy	1,482,521 +455,572	+44%	+$11.8M	﹤0.01%	2296
2024 Q3	$33.1M	Buy	+1,026,949	New	+$29.3M	﹤0.01%	2267

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

Morgan Stanley's AMTM Position: Q2 2026 in Review

Morgan Stanley increased its Amentum Holdings (AMTM) stake by 19% in Q2 2026, buying an estimated $10.3M and bringing the position to 2,662,329 shares worth $55M. The position accounts for ﹤0.01% of the portfolio, ranked #2128.

Morgan Stanley first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. The position peaked at $60.2M in Q4 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

Morgan Stanley held 2,662,329 shares of Amentum Holdings worth $55M as of Q2 2026.
Morgan Stanley bought 427,416 Amentum Holdings shares in Q2 2026, an estimated $10.3M.
Amentum Holdings made up ﹤0.01% of Morgan Stanley's portfolio in Q2 2026, its #2128 holding.
Morgan Stanley first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
Morgan Stanley's Amentum Holdings position peaked at $60.2M in Q4 2025.
458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Morgan Stanley's 13F filing for Q2 2026, filed 13 Aug 2026.