BCM
AMTM

Brightline Capital Management’s Amentum Holdings AMTM Stock Holding History

Brightline Capital Management’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 		– Sell
-1,396,000
Closed -$36.4M – 13
2026
Q1 		$36.4M Buy
1,396,000
+4,000
+0.3% +$126K 10.77% 4
2025
Q4 		$40.4M Buy
1,392,000
+192,000
+16% +$4.91M 16.32% 2
2025
Q3 		$28.7M Buy
1,200,000
+200,000
+20% +$4.87M 11.78% 3
2025
Q2 		$23.6M Buy
+1,000,000
New +$20.9M 10.17% 5

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

Brightline Capital Management's AMTM Position: Q2 2026 in Review

Brightline Capital Management sold out of Amentum Holdings (AMTM) in Q2 2026, closing a stake of 1,396,000 shares — an estimated $36.4M sold.

Brightline Capital Management first reported a position in AMTM in Q2 2025 and held it in 4 quarters. The position peaked at $40.4M in Q4 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Brightline Capital Management reported no remaining Amentum Holdings position as of Q2 2026 after selling out during the quarter.
  • Brightline Capital Management sold 1,396,000 Amentum Holdings shares in Q2 2026, an estimated $36.4M.
  • Brightline Capital Management first reported a position in Amentum Holdings in Q2 2025 and held it in 4 quarters.
  • Brightline Capital Management's Amentum Holdings position peaked at $40.4M in Q4 2025.
  • 458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Brightline Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.