XT
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XTX Topco’s SIGA Technologies SIGA Stock Holding History

XTX Topco’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 		$228K Buy
+62,668
New +$281K ﹤0.01% 3156
2024
Q4 		– Sell
-12,654
Closed -$85.4K – 2871
2024
Q3 		$85.4K Buy
+12,654
New +$110K 0.01% 1628
2023
Q1 		– Sell
-14,082
Closed -$104K – 1629
2022
Q4 		$104K Sell
14,082
-18,033
-56% -$158K 0.02% 995
2022
Q3 		$331K Buy
+32,115
New +$516K 0.08% 448

Other funds holding SIGA

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $552B AUM 44.19% 1-Year Est. Return
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

XTX Topco's SIGA Position: Q2 2026 in Review

XTX Topco opened a new position in SIGA Technologies (SIGA) in Q2 2026: 62,668 shares worth $228K. The stake represents ﹤0.01% of the portfolio and ranks #3156 among its holdings. This is a return to the name: XTX Topco previously reported a position in SIGA as recently as Q3 2024.

XTX Topco first reported a position in SIGA in Q3 2022 and has held it in 4 quarters since. The position peaked at $331K in Q3 2022. 160 funds tracked by Wall St. Rank hold SIGA as of Q2 2026.

  • XTX Topco held 62,668 shares of SIGA Technologies worth $228K as of Q2 2026.
  • SIGA Technologies was a new XTX Topco position in Q2 2026.
  • SIGA Technologies made up ﹤0.01% of XTX Topco's portfolio in Q2 2026, its #3156 holding.
  • XTX Topco first reported a position in SIGA Technologies in Q3 2022 and has held it in 4 quarters since.
  • XTX Topco's SIGA Technologies position peaked at $331K in Q3 2022.
  • 160 funds tracked by Wall St. Rank held SIGA Technologies as of Q2 2026.

Based on XTX Topco's 13F filing for Q2 2026, filed 14 Aug 2026.