Brown Advisory
AMTM

Brown Advisory’s Amentum Holdings AMTM Stock Holding History

Brown Advisory’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
Q1 		$259K Sell
9,928
-21
-0.2% -$659 ﹤0.01% 1261
2025
Q4 		$289K Sell
9,949
-202
-2% -$5.16K ﹤0.01% 1221
2025
Q3 		$243K Sell
10,151
-457
-4% -$11.1K ﹤0.01% 1274
2025
Q2 		$250K Sell
10,608
-1,057
-9% -$22.1K ﹤0.01% 1226
2025
Q1 		$212K Sell
11,665
-2,025
-15% -$41.2K ﹤0.01% 1249
2024
Q4 		$288K Sell
13,690
-562
-4% -$14.5K ﹤0.01% 1173
2024
Q3 		$460K Buy
+14,252
New +$406K ﹤0.01% 1007

Other funds holding AMTM

AS
American Securities New York $3.93B AUM 52.22% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $9.73B AUM 55.65% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return

Brown Advisory's AMTM Position: Q1 2026 in Review

Brown Advisory reduced its Amentum Holdings (AMTM) stake by 0.21% in Q1 2026, selling an estimated $659 and leaving 9,928 shares worth $259K. The position accounts for ﹤0.01% of the portfolio, ranked #1261.

Brown Advisory first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $460K in Q3 2024. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Brown Advisory held 9,928 shares of Amentum Holdings worth $259K as of Q1 2026.
  • Brown Advisory sold 21 Amentum Holdings shares in Q1 2026, an estimated $659.
  • Amentum Holdings made up ﹤0.01% of Brown Advisory's portfolio in Q1 2026, its #1261 holding.
  • Brown Advisory first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • Brown Advisory's Amentum Holdings position peaked at $460K in Q3 2024.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Brown Advisory's 13F filing for Q1 2026, filed 15 May 2026.