Optiver Holding
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Optiver Holding’s SIGA Technologies SIGA Stock Holding History

Optiver Holding’s Portfolio SIGA Stock Details SIGA Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		– Sell
-322
Closed -$1.72K – 3055
2026
Q1 		$1.72K Sell
322
-128
-28% -$798 ﹤0.01% 1906
2025
Q4 		$2.75K Hold
450
– – ﹤0.01% 1814
2025
Q3 		$4.12K Buy
+450
New +$3.6K ﹤0.01% 1918

Other funds holding SIGA

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Dimensional Fund Advisors
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AC
AltraVue Capital Bellevue, Washington $1.39B AUM 53.77% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Arrowstreet Capital
Arrowstreet Capital Boston, Massachusetts $225B AUM 49.49% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
FWSM
First Wilshire Securities Management Pasadena, California $486M AUM 50.29% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Optiver Holding's SIGA Position: Q2 2026 in Review

Optiver Holding sold out of SIGA Technologies (SIGA) in Q2 2026, closing a stake of 322 shares — an estimated $1.72K sold.

Optiver Holding first reported a position in SIGA in Q3 2025 and held it in 3 quarters. The position peaked at $4.12K in Q3 2025. 160 funds tracked by Wall St. Rank hold SIGA as of Q2 2026.

  • Optiver Holding reported no remaining SIGA Technologies position as of Q2 2026 after selling out during the quarter.
  • Optiver Holding sold 322 SIGA Technologies shares in Q2 2026, an estimated $1.72K.
  • Optiver Holding first reported a position in SIGA Technologies in Q3 2025 and held it in 3 quarters.
  • Optiver Holding's SIGA Technologies position peaked at $4.12K in Q3 2025.
  • 160 funds tracked by Wall St. Rank held SIGA Technologies as of Q2 2026.

Based on Optiver Holding's 13F filing for Q2 2026, filed 12 Aug 2026.