HCA
AMTM

Harbor Capital Advisors’s Amentum Holdings AMTM Stock Holding History

Harbor Capital Advisors’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 		$816K Buy
+39,501
New +$955K 0.06% 407
2026
Q1 		– Sell
-169
Closed -$5K – 1517
2025
Q4 		$5K Sell
169
-1
-0.6% -$26 ﹤0.01% 1164
2025
Q3 		$4K Hold
170
– – ﹤0.01% 1232
2025
Q2 		$4K Buy
+170
New +$3.55K ﹤0.01% 1244
2025
Q1 		– Sell
-1,380
Closed -$29K – 1561
2024
Q4 		$29K Buy
1,380
+32
+2% +$827 ﹤0.01% 784
2024
Q3 		$43K Buy
+1,348
New +$38.4K ﹤0.01% 766

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

Harbor Capital Advisors's AMTM Position: Q2 2026 in Review

Harbor Capital Advisors opened a new position in Amentum Holdings (AMTM) in Q2 2026: 39,501 shares worth $816K. The stake represents 0.06% of the portfolio and ranks #407 among its holdings. This is a return to the name: Harbor Capital Advisors previously reported a position in AMTM as recently as Q4 2025.

Harbor Capital Advisors first reported a position in AMTM in Q3 2024 and has held it in 6 quarters since. 464 funds tracked by Wall St. Rank hold AMTM as of Q2 2026.

  • Harbor Capital Advisors held 39,501 shares of Amentum Holdings worth $816K as of Q2 2026.
  • Amentum Holdings was a new Harbor Capital Advisors position in Q2 2026.
  • Amentum Holdings made up 0.06% of Harbor Capital Advisors's portfolio in Q2 2026, its #407 holding.
  • Harbor Capital Advisors first reported a position in Amentum Holdings in Q3 2024 and has held it in 6 quarters since.
  • 464 funds tracked by Wall St. Rank held Amentum Holdings as of Q2 2026.

Based on Harbor Capital Advisors's 13F filing for Q2 2026, filed 7 Aug 2026.