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John Overdeck’s SIGA Technologies SIGA Stock Holding History

John Overdeck’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 		$1.3M Sell
357,715
-75,946
-18% -$340K ﹤0.01% 3401
2026
Q1 		$2.32M Buy
433,661
+423,261
+4,070% +$2.64M ﹤0.01% 2643
2025
Q4 		$63.5K Buy
+10,400
New +$74K ﹤0.01% 3909
2025
Q3 		– Sell
-113,735
Closed -$742K – 3903
2025
Q2 		$742K Buy
113,735
+85,993
+310% +$516K ﹤0.01% 2401
2025
Q1 		$152K Buy
+27,742
New +$164K ﹤0.01% 2901
2023
Q2 		– Sell
-80,844
Closed -$465K – 3238
2023
Q1 		$465K Sell
80,844
-688,568
-89% -$4.6M ﹤0.01% 2233
2022
Q4 		$5.66M Sell
769,412
-224,629
-23% -$1.97M 0.02% 798
2022
Q3 		$10.2M Buy
994,041
+325,837
+49% +$5.24M 0.03% 484
2022
Q2 		$7.74M Buy
+668,204
New +$6.02M 0.03% 599
2021
Q2 		– Sell
-30,227
Closed -$196K – 4510
2021
Q1 		$196K Sell
30,227
-78,886
-72% -$535K ﹤0.01% 3634
2020
Q4 		$793K Sell
109,113
-66,317
-38% -$467K ﹤0.01% 2182
2020
Q3 		$1.21M Buy
175,430
+80,379
+85% +$546K ﹤0.01% 1635
2020
Q2 		$562K Buy
+95,051
New +$543K ﹤0.01% 1926
2014
Q3 		– Sell
-11,633
Closed -$33K – 2025
2014
Q2 		$33K Buy
+11,633
New +$32.6K ﹤0.01% 2100
2014
Q1 		– Sell
-23,223
Closed -$76K – 2222
2013
Q4 		$76K Buy
+23,223
New +$78.4K ﹤0.01% 2102

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 53.78% 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

John Overdeck's SIGA Position: Q2 2026 in Review

John Overdeck reduced its SIGA Technologies (SIGA) stake by 18% in Q2 2026, selling an estimated $340K and leaving 357,715 shares worth $1.3M. The position accounts for ﹤0.01% of the portfolio, ranked #3401.

John Overdeck first reported a position in SIGA in Q4 2013 and has held it in 15 quarters since. The position peaked at $10.2M in Q3 2022. 160 funds tracked by Wall St. Rank hold SIGA as of Q2 2026.

  • John Overdeck held 357,715 shares of SIGA Technologies worth $1.3M as of Q2 2026.
  • John Overdeck sold 75,946 SIGA Technologies shares in Q2 2026, an estimated $340K.
  • SIGA Technologies made up ﹤0.01% of John Overdeck's portfolio in Q2 2026, its #3401 holding.
  • John Overdeck first reported a position in SIGA Technologies in Q4 2013 and has held it in 15 quarters since.
  • John Overdeck's SIGA Technologies position peaked at $10.2M in Q3 2022.
  • 160 funds tracked by Wall St. Rank held SIGA Technologies as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.