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Atom Investors’s SIGA Technologies SIGA Stock Holding History

Atom Investors’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 		$209K Buy
+57,464
New +$257K 0.02% 769
2025
Q2 		– Sell
-13,012
Closed -$71.3K – 768
2025
Q1 		$71.3K Buy
+13,012
New +$77.1K 0.01% 453
2024
Q2 		– Sell
-11,502
Closed -$98.5K – 654
2024
Q1 		$98.5K Buy
+11,502
New +$65.7K 0.01% 524

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

Atom Investors's SIGA Position: Q2 2026 in Review

Atom Investors opened a new position in SIGA Technologies (SIGA) in Q2 2026: 57,464 shares worth $209K. The stake represents 0.02% of the portfolio and ranks #769 among its holdings. This is a return to the name: Atom Investors previously reported a position in SIGA as recently as Q1 2025.

Atom Investors first reported a position in SIGA in Q1 2024 and has held it in 3 quarters since. 160 funds tracked by Wall St. Rank hold SIGA as of Q2 2026.

  • Atom Investors held 57,464 shares of SIGA Technologies worth $209K as of Q2 2026.
  • SIGA Technologies was a new Atom Investors position in Q2 2026.
  • SIGA Technologies made up 0.02% of Atom Investors's portfolio in Q2 2026, its #769 holding.
  • Atom Investors first reported a position in SIGA Technologies in Q1 2024 and has held it in 3 quarters since.
  • 160 funds tracked by Wall St. Rank held SIGA Technologies as of Q2 2026.

Based on Atom Investors's 13F filing for Q2 2026, filed 14 Aug 2026.