Janus Henderson Group
AMTM

Janus Henderson Group’s Amentum Holdings AMTM Stock Holding History

Janus Henderson Group’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 		$1.81M Hold
69,400
– – ﹤0.01% 1401
2025
Q4 		$2.01M Hold
69,400
– – ﹤0.01% 1328
2025
Q3 		$1.66M Hold
69,400
– – ﹤0.01% 1410
2025
Q2 		$1.64M Sell
69,400
-61,600
-47% -$1.29M ﹤0.01% 1381
2025
Q1 		$2.37M Buy
131,000
+64,761
+98% +$1.32M ﹤0.01% 1190
2024
Q4 		$1.39M Sell
66,239
-50,820
-43% -$1.31M ﹤0.01% 1504
2024
Q3 		$3.5M Buy
+117,059
New +$3.33M ﹤0.01% 1031

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
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
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Janus Henderson Group's AMTM Position: Q1 2026 in Review

Janus Henderson Group held its Amentum Holdings (AMTM) position steady in Q1 2026 at 69,400 shares worth $1.81M. The position accounts for ﹤0.01% of the portfolio, ranked #1401.

Janus Henderson Group first reported a position in AMTM in Q3 2024 and has held it in 7 quarters since. The position peaked at $3.5M in Q3 2024. 487 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Janus Henderson Group held 69,400 shares of Amentum Holdings worth $1.81M as of Q1 2026.
  • Janus Henderson Group left its Amentum Holdings share count unchanged in Q1 2026.
  • Amentum Holdings made up ﹤0.01% of Janus Henderson Group's portfolio in Q1 2026, its #1401 holding.
  • Janus Henderson Group first reported a position in Amentum Holdings in Q3 2024 and has held it in 7 quarters since.
  • Janus Henderson Group's Amentum Holdings position peaked at $3.5M in Q3 2024.
  • 487 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Janus Henderson Group's 13F filing for Q1 2026, filed 15 May 2026.