RhumbLine Advisers
AMTM

RhumbLine Advisers’s Amentum Holdings AMTM Stock Holding History

RhumbLine Advisers’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 		$5.87M Sell
284,060
-16,233
-5% -$393K ﹤0.01% 1386
2026
Q1 		$7.83M Buy
300,293
+8,852
+3% +$278K 0.01% 1185
2025
Q4 		$8.45M Buy
291,441
+1,623
+0.6% +$41.5K 0.01% 1141
2025
Q3 		$6.94M Buy
289,818
+2,571
+0.9% +$62.6K 0.01% 1261
2025
Q2 		$6.78M Sell
287,247
-22,856
-7% -$478K 0.01% 1253
2025
Q1 		$5.64M Buy
310,103
+14,919
+5% +$304K 0.01% 1296
2024
Q4 		$6.21M Buy
295,184
+73,326
+33% +$1.9M 0.01% 1320
2024
Q3 		$7.15M Buy
+221,858
New +$6.32M 0.01% 1235

Other funds holding AMTM

AS
American Securities New York $3.75B AUM 23.12% 1-Year Est. Return
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 $3.38T AUM 44.17% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return

RhumbLine Advisers's AMTM Position: Q2 2026 in Review

RhumbLine Advisers reduced its Amentum Holdings (AMTM) stake by 5.4% in Q2 2026, selling an estimated $393K and leaving 284,060 shares worth $5.87M. The position accounts for ﹤0.01% of the portfolio, ranked #1386.

RhumbLine Advisers first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. The position peaked at $8.45M in Q4 2025. 464 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • RhumbLine Advisers held 284,060 shares of Amentum Holdings worth $5.87M as of Q2 2026.
  • RhumbLine Advisers sold 16,233 Amentum Holdings shares in Q2 2026, an estimated $393K.
  • Amentum Holdings made up ﹤0.01% of RhumbLine Advisers's portfolio in Q2 2026, its #1386 holding.
  • RhumbLine Advisers first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
  • RhumbLine Advisers's Amentum Holdings position peaked at $8.45M in Q4 2025.
  • 464 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on RhumbLine Advisers's 13F filing for Q2 2026, filed 12 Aug 2026.