Loomis, Sayles & Company
AMTM

Loomis, Sayles & Company’s Amentum Holdings AMTM Stock Holding History

Loomis, Sayles & Company’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 		$21.5M Sell
1,042,522
-38,814
-4% -$939K 0.03% 242
2026
Q1 		$28.2M Sell
1,081,336
-37,594
-3% -$1.18M 0.04% 178
2025
Q4 		$32.4M Buy
1,118,930
+54,851
+5% +$1.4M 0.04% 168
2025
Q3 		$25.5M Buy
1,064,079
+4,870
+0.5% +$119K 0.03% 203
2025
Q2 		$25M Buy
1,059,209
+623,535
+143% +$13M 0.03% 199
2025
Q1 		$7.93M Buy
+435,674
New +$8.87M 0.01% 382

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

Loomis, Sayles & Company's AMTM Position: Q2 2026 in Review

Loomis, Sayles & Company reduced its Amentum Holdings (AMTM) stake by 3.6% in Q2 2026, selling an estimated $939K and leaving 1,042,522 shares worth $21.5M. The position accounts for 0.03% of the portfolio, ranked #242.

Loomis, Sayles & Company first reported a position in AMTM in Q1 2025 and has held it in 6 quarters since. The position peaked at $32.4M in Q4 2025. 458 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Loomis, Sayles & Company held 1,042,522 shares of Amentum Holdings worth $21.5M as of Q2 2026.
  • Loomis, Sayles & Company sold 38,814 Amentum Holdings shares in Q2 2026, an estimated $939K.
  • Amentum Holdings made up 0.03% of Loomis, Sayles & Company's portfolio in Q2 2026, its #242 holding.
  • Loomis, Sayles & Company first reported a position in Amentum Holdings in Q1 2025 and has held it in 6 quarters since.
  • Loomis, Sayles & Company's Amentum Holdings position peaked at $32.4M in Q4 2025.
  • 458 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Loomis, Sayles & Company's 13F filing for Q2 2026, filed 14 Aug 2026.