RF
AMTM

Rossby Financial’s Amentum Holdings AMTM Stock Holding History

Rossby Financial’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 		$5.95K Hold
288
– – ﹤0.01% 1367
2026
Q1 		$7.59K Hold
288
– – ﹤0.01% 1355
2025
Q4 		$8.35K Hold
288
– – ﹤0.01% 983
2025
Q3 		$7.25K Hold
288
– – ﹤0.01% 917
2025
Q2 		$6.8K Buy
288
+16
+6% +$334 ﹤0.01% 853
2025
Q1 		$5.96K Buy
+272
New +$5.54K ﹤0.01% 784

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

Rossby Financial's AMTM Position: Q2 2026 in Review

Rossby Financial held its Amentum Holdings (AMTM) position steady in Q2 2026 at 288 shares worth $5.95K. The position accounts for ﹤0.01% of the portfolio, ranked #1367.

Rossby Financial first reported a position in AMTM in Q1 2025 and has held it in 6 quarters since. The position peaked at $8.35K in Q4 2025. 462 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Rossby Financial held 288 shares of Amentum Holdings worth $5.95K as of Q2 2026.
  • Rossby Financial left its Amentum Holdings share count unchanged in Q2 2026.
  • Amentum Holdings made up ﹤0.01% of Rossby Financial's portfolio in Q2 2026, its #1367 holding.
  • Rossby Financial first reported a position in Amentum Holdings in Q1 2025 and has held it in 6 quarters since.
  • Rossby Financial's Amentum Holdings position peaked at $8.35K in Q4 2025.
  • 462 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Rossby Financial's 13F filing for Q2 2026, filed 4 Aug 2026.