RCG
AMTM

Ruane, Cunniff & Goldfarb’s Amentum Holdings AMTM Stock Holding History

Ruane, Cunniff & Goldfarb’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 		$11.1M Sell
537,213
-1,085,769
-67% -$26.3M 0.17% 23
2026
Q1 		$42.3M Sell
1,622,982
-771,147
-32% -$24.2M 0.7% 24
2025
Q4 		$69.4M Sell
2,394,129
-29,619
-1% -$757K 1.08% 21
2025
Q3 		$58M Sell
2,423,748
-17,995
-0.7% -$438K 0.96% 20
2025
Q2 		$57.6M Buy
2,441,743
+48,704
+2% +$1.02M 0.99% 21
2025
Q1 		$43.6M Sell
2,393,039
-43,255
-2% -$881K 0.79% 20
2024
Q4 		$51.2M Sell
2,436,294
-94,195
-4% -$2.43M 0.87% 19
2024
Q3 		$81.6M Buy
+2,530,489
New +$72.1M 1.28% 18

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 $3.37T AUM 44.26% 1-Year Est. Return
FCM
Frontier Capital Management Boston, Massachusetts $10.7B AUM 67.78% 1-Year Est. Return

Ruane, Cunniff & Goldfarb's AMTM Position: Q2 2026 in Review

Ruane, Cunniff & Goldfarb reduced its Amentum Holdings (AMTM) stake by 67% in Q2 2026, selling an estimated $26.3M and leaving 537,213 shares worth $11.1M. The position accounts for 0.17% of the portfolio, ranked #23.

Ruane, Cunniff & Goldfarb first reported a position in AMTM in Q3 2024 and has held it in 8 quarters since. The position peaked at $81.6M in Q3 2024. 460 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Ruane, Cunniff & Goldfarb held 537,213 shares of Amentum Holdings worth $11.1M as of Q2 2026.
  • Ruane, Cunniff & Goldfarb sold 1,085,769 Amentum Holdings shares in Q2 2026, an estimated $26.3M.
  • Amentum Holdings made up 0.17% of Ruane, Cunniff & Goldfarb's portfolio in Q2 2026, its #23 holding.
  • Ruane, Cunniff & Goldfarb first reported a position in Amentum Holdings in Q3 2024 and has held it in 8 quarters since.
  • Ruane, Cunniff & Goldfarb's Amentum Holdings position peaked at $81.6M in Q3 2024.
  • 460 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Ruane, Cunniff & Goldfarb's 13F filing for Q2 2026, filed 14 Aug 2026.