SIGA Technologies, Inc.
US ˙ NasdaqGM ˙ US8269171067

SecuritySIGA / SIGA Technologies, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership2,702,724 shares
Latest Disclosed Value $ 14,459,148
Dimensional Fund Advisors Lp reports 6.54% increase in ownership of SIGA / SIGA Technologies, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 2,702,724 shares of SIGA Technologies, Inc. (US:SIGA) valued at $14,459,573 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 2,536,794 shares of SIGA Technologies, Inc.. This represents a change in shares of 6.54% during the quarter. The current value of the position is $11,594,686 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-07 2026-03-31 13F SIGA TECHNOLOGIES COM 826917106 2,702,724 165,930 6.54 14,459 -6.72 0.0006
2026-02-12 2025-12-31 13F SIGA TECHNOLOGIES COM 826917106 2,536,794 104,414 4.29 15,500 -30.35 0.0033
2025-11-12 2025-09-30 13F SIGA TECHNOLOGIES COM 826917106 2,432,380 24,901 1.03 22,255 41.78 0.0048
2025-08-12 2025-06-30 13F SIGA TECHNOLOGIES COM 826917106 2,407,479 54,596 2.32 15,697 21.74 0.0036
2025-05-13 2025-03-31 13F SIGA TECHNOLOGIES COM 826917106 2,352,883 226,818 10.67 12,894 0.91 0.0032
2025-02-13 2024-12-31 13F SIGA TECHNOLOGIES COM 826917106 2,126,065 217,926 11.42 12,777 -0.81 0.0031
2024-11-07 2024-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,908,139 86,351 4.74 12,881 -6.83 0.0031
2024-08-09 2024-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,821,788 133,883 7.93 13,826 -4.31 0.0036
2024-05-10 2024-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,687,905 -10,249 -0.60 14,448 51.94 0.0039
2024-02-07 2023-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,698,154 226,187 15.37 9,510 23.06 0.0028
2023-11-09 2023-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,471,967 336,905 29.68 7,728 34.80 0.0025
2023-08-09 2023-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,135,062 72,581 6.83 5,732 -6.16 0.0018
2023-05-12 2023-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,062,481 -42,941 -3.88 6,108 76,250.00 0.0021
2023-02-09 2022-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,105,422 -7,764 -0.70 8 -99.93 0.0024
2022-11-10 2022-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,113,186 -24,846 -2.18 11,467 -12.97 0.0044
2022-08-12 2022-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,138,032 185,398 19.46 13,176 95.06 0.0047
2022-05-13 2022-03-31 13F SIGA TECHNOLOGIES COM 826917106 952,634 44,801 4.93 6,755 -1.05 0.0021
2022-02-09 2021-12-31 13F SIGA TECHNOLOGIES COM 826917106 907,833 105,566 13.16 6,827 15.17 0.0021
2021-11-12 2021-09-30 13F SIGA TECHNOLOGIES COM 826917106 802,267 109,042 15.73 5,928 36.15 0.0019
2021-08-12 2021-06-30 13F SIGA TECHNOLOGIES COM 826917106 693,225 144,415 26.31 4,354 22.06 0.0014
2021-05-14 2021-03-31 13F SIGA TECHNOLOGIES COM 826917106 548,810 35,749 6.97 3,567 -4.37 0.0012
2021-03-08 2020-12-31 13F/A-2 SIGA TECHNOLOGIES COM 826917106 513,061 46,864 10.05 3,730 16.45 0.0013
2021-02-11 2020-12-31 13F SIGA TECHNOLOGIES COM 826917106 513,061 46,864 3,730 1,347.0777
2020-11-12 2020-09-30 13F SIGA TECHNOLOGIES COM 826917106 466,197 17,075 3.80 3,203 20.69 0.0014
2020-08-13 2020-06-30 13F SIGA TECHNOLOGIES COM 826917106 449,122 53,087 13.40 2,654 40.20 0.0012
2020-05-14 2020-03-31 13F SIGA TECHNOLOGIES COM 826917106 396,035 61,075 18.23 1,893 18.46 0.0010
2020-02-14 2019-12-31 13F SIGA TECHNOLOGIES COM 826917106 334,960 55,624 19.91 1,598 11.75 0.0006
2019-11-12 2019-09-30 13F SIGA TECHNOLOGIES COM 826917106 279,336 65,036 30.35 1,430 17.50 0.0006
2019-08-13 2019-06-30 13F SIGA TECHNOLOGIES COM 826917106 214,300 179,526 516.27 1,217 482.30 0.0005
2019-08-12 2019-03-31 13F/A-2 SIGA TECHNOLOGIES COM 826917106 34,774 0 0.00 209 -23.72 0.0001
2019-05-10 2019-03-31 13F SIGA TECHNOLOGIES COM 826917106 34,774 0 209
2019-02-26 2018-12-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 34,774 34,774 274 0.0001
2019-02-13 2018-12-31 13F SIGA TECHNOLOGIES COM 826917106 34,774 34,774 274
2014-11-13 2014-09-30 13F SIGA TECHNOLOGIES COM 826917106 0 -700 -100.00 0 -100.00
2014-08-08 2014-06-30 13F SIGA TECHNOLOGIES COM 826917106 700 0 0.00 2 0.00 0.0000
2014-05-14 2014-03-31 13F SIGA TECHNOLOGIES COM 826917106 700 0 0.00 2 0.00 0.0000
2014-02-12 2013-12-31 13F SIGA TECHNOLOGIES COM 826917106 700 0 0.00 2 -33.33 0.0000
2013-11-13 2013-09-30 13F SIGA TECHNOLOGIES COM 826917106 700 -13,800 -95.17 3 -92.68 0.0000
2013-08-15 2013-06-30 13F SIGA TECHNOLOGIES COM 826917106 14,500 14,500 41 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.