SIGA Technologies, Inc.
US ˙ NasdaqGM ˙ US8269171067

SecuritySIGA / SIGA Technologies, Inc.
InstitutionState Street Corp
Latest Disclosed Ownership1,011,938 shares
Latest Disclosed Value $ 5,413,868
State Street Corp reports 5.92% decrease in ownership of SIGA / SIGA Technologies, Inc.

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,011,938 shares of SIGA Technologies, Inc. (US:SIGA) valued at $5,413,868 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,075,570 shares of SIGA Technologies, Inc.. This represents a change in shares of -5.92% during the quarter. The current value of the position is $4,482,885 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)
2026-05-15 2026-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,011,938 -63,632 -5.92 5,414 -17.62 0.0002
2026-02-13 2025-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,075,570 41,716 4.03 6,572 -30.53 0.0002
2025-11-14 2025-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,033,854 -76,163 -6.86 9,460 30.70 0.0003
2025-08-14 2025-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,110,017 2,590 0.23 7,237 19.26 0.0003
2025-05-15 2025-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,107,427 -49,700 -4.30 6,069 -12.74 0.0003
2025-02-14 2024-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,157,127 59,314 5.40 6,954 -6.15 0.0003
2024-11-14 2024-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,097,813 -31,353 -2.78 7,410 -13.54 0.0003
2024-08-14 2024-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,129,166 24,761 2.24 8,570 -15.22 0.0004
2024-05-15 2024-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,104,405 50,545 4.80 10,110 71.31 0.0005
2024-02-14 2023-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,053,860 53,369 5.33 5,902 12.36 0.0003
2023-11-14 2023-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,000,491 37,101 3.85 5,253 7.95 0.0003
2023-08-14 2023-06-30 13F SIGA TECHNOLOGIES COM 826917106 963,390 8,205 0.86 4,865 -11.42 0.0003
2023-05-15 2023-03-31 13F SIGA TECHNOLOGIES COM 826917106 955,185 -414,841 -30.28 5,492 -45.53 0.0003
2023-05-15 2022-12-31 13F/A-99 SIGA TECHNOLOGIES COM 826917106 1,370,026 -144,079 -9.52 10,083 -35.34 0.0006
2023-05-15 2022-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,370,026 -144,079 10,083 0.0006
2022-11-15 2022-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,514,105 521,261 52.50 15,595 35.64 0.0010
2022-08-15 2022-06-30 13F SIGA TECHNOLOGIES COM 826917106 992,844 -71,363 -6.71 11,497 52.38 0.0007
2022-05-16 2022-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,064,207 17,145 1.64 7,545 -4.18 0.0004
2022-02-14 2021-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,047,062 -4,828 -0.46 7,874 1.30 0.0004
2021-11-15 2021-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,051,890 -45,985 -4.19 7,773 12.73 0.0004
2021-08-16 2021-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,097,875 81,602 8.03 6,895 4.37 0.0004
2021-07-09 2021-03-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 1,016,273 -26,977 -2.59 6,606 -12.90 0.0004
2021-05-17 2021-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,016,273 -26,977 6,606 0.0004
2021-02-16 2020-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,043,250 -6,090 -0.58 7,584 5.20 0.0005
2020-11-10 2020-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,049,340 -65,551 -5.88 7,209 9.41 0.0005
2020-08-14 2020-06-30 13F SIGA TECHNOLOGIES COM 826917106 1,114,891 36,669 3.40 6,589 27.84 0.0005
2020-06-19 2020-03-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 1,078,222 -38,510 -3.45 5,154 -3.25 0.0005
2020-05-11 2020-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,078,222 -38,510 5,154 452.6250
2020-02-06 2019-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,116,732 116,193 11.61 5,327 3.98 0.0004
2019-11-14 2019-09-30 13F SIGA TECHNOLOGIES COM 826917106 1,000,539 11,924 1.21 5,123 -8.76 0.0004
2019-08-14 2019-06-30 13F SIGA TECHNOLOGIES COM 826917106 988,615 47,885 5.09 5,615 -0.69 0.0004
2019-05-15 2019-03-31 13F SIGA TECHNOLOGIES COM 826917106 940,730 38,503 4.27 5,654 -20.68 0.0004
2019-02-12 2018-12-31 13F SIGA TECHNOLOGIES COM 826917106 902,227 72,817 8.78 7,128 24.72 0.0006
2018-11-09 2018-09-30 13F SIGA TECHNOLOGIES Common equity shares 826917106 829,410 21,016 2.60 5,715 19.01 0.0004
2018-08-14 2018-06-30 13F SIGA TECHNOLOGIES Common equity shares 826917106 808,394 808,394 4,802 0.0004
2015-05-15 2015-03-31 13F SIGA TECHNOLOGIES Common equity shares 826917106 0 -16,600 -100.00 0 -100.00
2015-02-11 2014-12-31 13F SIGA TECHNOLOGIES Common equity shares 826917106 16,600 0 0.00 24 0.00 0.0000
2014-11-12 2014-09-30 13F/A-1 SIGA TECHNOLOGIES Common equity shares 826917106 16,600 -25,920 -60.96 24 -80.17 0.0000
2014-11-10 2014-09-30 13F SIGA TECHNOLOGIES Common equity shares 826917106 16,600 24
2014-08-12 2014-06-30 13F SIGA TECHNOLOGIES Common equity shares 826917106 42,520 -557,377 -92.91 121 -93.50 0.0000
2014-05-15 2014-03-31 13F/A-1 SIGA TECHNOLOGIES Common equity shares 826917106 599,897 4,488 0.75 1,862 -4.46 0.0002
2014-05-13 2014-03-31 13F SIGA TECHNOLOGIES Common equity shares 826917106 599,897 1,862
2014-02-06 2013-12-31 13F/A-1 SIGA TECHNOLOGIES Common equity shares 826917106 595,409 325 0.05 1,949 -14.78 0.0002
2014-02-06 2013-12-31 13F SIGA TECHNOLOGIES Common equity shares 826917106 636,116 1,668
2013-11-12 2013-09-30 13F SIGA TECHNOLOGIES Common Stock 826917106 595,084 -11,692 -1.93 2,287 32.73 0.0003
2013-08-08 2013-06-30 13F SIGA TECHNOLOGIES Common Stock 826917106 606,776 606,776 1,723 0.0002
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.