Blackstone Inc
AMTM

Blackstone Inc’s Amentum Holdings AMTM Stock Holding History

Blackstone Inc’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 		$641K Buy
+31,027
New +$750K ﹤0.01% 312
2026
Q1 		– Sell
-99,643
Closed -$2.89M – 494
2025
Q4 		$2.89M Buy
99,643
+50,537
+103% +$1.29M 0.01% 158
2025
Q3 		$1.18M Buy
+49,106
New +$1.2M ﹤0.01% 184

Other funds holding AMTM

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
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 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
TCA
Troluce Capital Advisors Dorado, Puerto Rico $971M AUM 2.27% 1-Year Est. Return

Blackstone Inc's AMTM Position: Q2 2026 in Review

Blackstone Inc opened a new position in Amentum Holdings (AMTM) in Q2 2026: 31,027 shares worth $641K. The stake represents ﹤0.01% of the portfolio and ranks #312 among its holdings. This is a return to the name: Blackstone Inc previously reported a position in AMTM as recently as Q4 2025.

Blackstone Inc first reported a position in AMTM in Q3 2025 and has held it in 3 quarters since. The position peaked at $2.89M in Q4 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Blackstone Inc held 31,027 shares of Amentum Holdings worth $641K as of Q2 2026.
  • Amentum Holdings was a new Blackstone Inc position in Q2 2026.
  • Amentum Holdings made up ﹤0.01% of Blackstone Inc's portfolio in Q2 2026, its #312 holding.
  • Blackstone Inc first reported a position in Amentum Holdings in Q3 2025 and has held it in 3 quarters since.
  • Blackstone Inc's Amentum Holdings position peaked at $2.89M in Q4 2025.
  • 458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Blackstone Inc's 13F filing for Q2 2026, filed 14 Aug 2026.