SNBOSCI
AMTM

Security National Bank of Sioux City Iowa’s Amentum Holdings AMTM Stock Holding History

Security National Bank of Sioux City Iowa’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 		$463K Sell
17,761
-1,528
-8% -$47.9K 0.27% 71
2025
Q4 		$559K Sell
19,289
-42
-0.2% -$1.07K 0.36% 63
2025
Q3 		$463K Buy
19,331
+58
+0.3% +$1.41K 0.3% 63
2025
Q2 		$455K Buy
19,273
+2,204
+13% +$46.1K 0.32% 64
2025
Q1 		$311K Buy
17,069
+1,800
+12% +$36.7K 0.23% 73
2024
Q4 		$321K Buy
+15,269
New +$395K 0.22% 76

Other funds holding AMTM

AS
American Securities New York $3.93B AUM 52.22% 1-Year Est. Return
Invesco
Invesco Atlanta, Georgia $1.02T AUM 30.18% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Primecap Management
Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 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 $9.73B AUM 55.65% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return

Security National Bank of Sioux City Iowa's AMTM Position: Q1 2026 in Review

Security National Bank of Sioux City Iowa reduced its Amentum Holdings (AMTM) stake by 7.9% in Q1 2026, selling an estimated $47.9K and leaving 17,761 shares worth $463K. The position accounts for 0.27% of the portfolio, ranked #71.

Security National Bank of Sioux City Iowa first reported a position in AMTM in Q4 2024 and has held it in 6 quarters since. The position peaked at $559K in Q4 2025. 486 funds tracked by Wall St. Rank hold AMTM as of Q1 2026.

  • Security National Bank of Sioux City Iowa held 17,761 shares of Amentum Holdings worth $463K as of Q1 2026.
  • Security National Bank of Sioux City Iowa sold 1,528 Amentum Holdings shares in Q1 2026, an estimated $47.9K.
  • Amentum Holdings made up 0.27% of Security National Bank of Sioux City Iowa's portfolio in Q1 2026, its #71 holding.
  • Security National Bank of Sioux City Iowa first reported a position in Amentum Holdings in Q4 2024 and has held it in 6 quarters since.
  • Security National Bank of Sioux City Iowa's Amentum Holdings position peaked at $559K in Q4 2025.
  • 486 funds tracked by Wall St. Rank held Amentum Holdings as of Q1 2026.

Based on Security National Bank of Sioux City Iowa's 13F filing for Q1 2026, filed 15 May 2026.