SIGA Technologies, Inc.
US ˙ NasdaqGM ˙ US8269171067

SecuritySIGA / SIGA Technologies, Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership263,335 shares
Latest Disclosed Value $ 1,408,846
Morgan Stanley reports 46.74% decrease in ownership of SIGA / SIGA Technologies, Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 263,335 shares of SIGA Technologies, Inc. (US:SIGA) valued at $1,408,842 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 494,456 shares of SIGA Technologies, Inc.. This represents a change in shares of -46.74% during the quarter. The current value of the position is $1,166,574 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 263,335 -231,121 -46.74 1,409 -53.39 0.0001
2026-05-27 2025-12-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 494,456 -162,506 -24.74 3,021 -49.74 0.0002
2026-02-13 2025-12-31 13F SIGA TECHNOLOGIES COM 826917106 494,456 -162,506 3,021 0.0002
2026-05-27 2025-09-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 656,962 135,094 25.89 6,011 76.69 0.0004
2025-11-14 2025-09-30 13F SIGA TECHNOLOGIES COM 826917106 656,962 135,094 6,011 0.0004
2025-08-15 2025-06-30 13F SIGA TECHNOLOGIES COM 826917106 521,868 229,009 78.20 3,403 112.09 0.0002
2025-05-15 2025-03-31 13F SIGA TECHNOLOGIES COM 826917106 292,859 41,205 16.37 1,605 6.08 0.0001
2025-05-15 2024-12-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 251,654 -71,840 -22.21 1,512 -30.74 0.0001
2025-02-14 2024-12-31 13F SIGA TECHNOLOGIES COM 826917106 251,654 -71,840 1,512 0.0001
2025-05-14 2024-09-30 13F/A-2 SIGA TECHNOLOGIES COM 826917106 323,494 -20,348 -5.92 2,184 -16.33 0.0002
2025-02-14 2024-09-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 323,494 -20,348 2,184 0.0002
2024-11-14 2024-09-30 13F SIGA TECHNOLOGIES COM 826917106 323,494 -20,348 2,184 0.0000
2025-05-14 2024-06-30 13F/A-2 SIGA TECHNOLOGIES COM 826917106 343,842 -239,302 -41.04 2,610 -47.73 0.0002
2024-10-17 2024-06-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 343,842 -239,302 2,610 0.0002
2024-08-14 2024-06-30 13F SIGA TECHNOLOGIES COM 826917106 343,842 -239,302 2,610 0.0002
2024-10-17 2024-03-31 13F/A-2 SIGA TECHNOLOGIES COM 826917106 583,144 180,271 44.75 4,992 121.23 0.0004
2024-08-16 2024-03-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 583,144 180,271 4,992 0.0000
2024-05-15 2024-03-31 13F SIGA TECHNOLOGIES COM 826917106 583,144 180,271 4,992 0.0004
2024-08-16 2023-12-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 402,873 230,622 133.89 2,256 149.56 0.0002
2024-02-13 2023-12-31 13F SIGA TECHNOLOGIES COM 826917106 402,873 230,622 2,256 0.0002
2023-11-15 2023-09-30 13F SIGA TECHNOLOGIES COM 826917106 172,251 13,609 8.58 904 12.86 0.0001
2023-08-14 2023-06-30 13F SIGA TECHNOLOGIES COM 826917106 158,642 -856,939 -84.38 801 -86.28 0.0001
2023-05-15 2023-03-31 13F SIGA TECHNOLOGIES COM 826917106 1,015,581 -1,133 -0.11 5,840 -21.97 0.0006
2023-02-14 2022-12-31 13F SIGA TECHNOLOGIES COM 826917106 1,016,714 282,166 38.41 7,483 -1.10 0.0008
2022-11-14 2022-09-30 13F SIGA TECHNOLOGIES COM 826917106 734,548 489,014 199.16 7,566 166.13 0.0010
2022-10-27 2022-06-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 245,534 154,915 170.95 2,843 342.83 0.0004
2022-08-15 2022-06-30 13F SIGA TECHNOLOGIES COM 826917106 245,534 154,915 2,843 0.0004
2022-10-27 2022-03-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 90,619 -19,695 -17.85 642 -22.46 0.0001
2022-05-13 2022-03-31 13F SIGA TECHNOLOGIES COM 826917106 90,619 -19,695 642 0.0001
2022-02-14 2021-12-31 13F SIGA TECHNOLOGIES COM 826917106 110,314 -68,238 -38.22 828 -37.23 0.0001
2021-11-15 2021-09-30 13F SIGA TECHNOLOGIES COM 826917106 178,552 60,719 51.53 1,319 78.00 0.0002
2021-08-23 2021-06-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 117,833 112,992 2,334.06 741 2,215.63 0.0001
2021-08-16 2021-06-30 13F SIGA TECHNOLOGIES COM 826917106 117,833 112,992 741 0.0000
2021-05-17 2021-03-31 13F SIGA TECHNOLOGIES COM 826917106 4,841 -70,946 -93.61 32 -94.19 0.0000
2021-02-16 2020-12-31 13F SIGA TECHNOLOGIES COM 826917106 75,787 64,233 555.94 551 597.47 0.0001
2020-11-13 2020-09-30 13F SIGA TECHNOLOGIES COM 826917106 11,554 -141,822 -92.47 79 -91.29 0.0000
2020-08-14 2020-06-30 13F SIGA TECHNOLOGIES COM 826917106 153,376 73,320 91.59 907 137.43 0.0002
2020-05-26 2020-03-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 80,056 -7,292 -8.35 382 -8.17 0.0001
2020-05-15 2020-03-31 13F SIGA TECHNOLOGIES COM 826917106 80,056 -7,292 382 29.3456
2020-02-14 2019-12-31 13F SIGA TECHNOLOGIES COM 826917106 87,348 57,567 193.30 416 171.90 0.0001
2019-11-14 2019-09-30 13F SIGA TECHNOLOGIES COM 826917106 29,781 17,605 144.59 153 121.74 0.0000
2019-08-14 2019-06-30 13F SIGA TECHNOLOGIES COM 826917106 12,176 -71,760 -85.49 69 -86.31 0.0000
2019-05-15 2019-03-31 13F SIGA TECHNOLOGIES COM 826917106 83,936 -67,198 -44.46 504 -57.79 0.0001
2019-02-14 2018-12-31 13F SIGA TECHNOLOGIES COM 826917106 151,134 49,151 48.20 1,194 70.09 0.0004
2019-04-23 2018-09-30 13F/A-2 SIGA TECHNOLOGIES COM 826917106 101,983 -15,835 -13.44 702 0.29 0.0002
2018-11-20 2018-09-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 101,983 0 702 0.0002
2018-11-14 2018-09-30 13F SIGA TECHNOLOGIES COM 826917106 101,983 -15,835 702
2019-04-23 2018-06-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 117,818 110,818 1,583.11 700 1,527.91 0.0002
2018-08-14 2018-06-30 13F SIGA TECHNOLOGIES COM 826917106 117,818 110,818 700
2019-04-23 2018-03-31 13F/A-1 SIGA TECHNOLOGIES COM 826917106 7,000 7,000 -94.06 43 -93.86 0.0000
2018-05-14 2018-03-31 13F SIGA TECHNOLOGIES COM 826917106 7,000 7,000 43
2015-05-14 2015-03-31 13F SIGA TECHNOLOGIES COM 826917106 0 -283,358 -100.00 0 -100.00
2015-02-13 2014-12-31 13F SIGA TECHNOLOGIES COM 826917106 283,358 126,176 80.27 408 79.74 0.0001
2014-12-16 2014-09-30 13F/A-1 SIGA TECHNOLOGIES COM 826917106 157,182 29,530 23.13 227 -42.53 0.0001
2014-11-14 2014-09-30 13F SIGA TECHNOLOGIES COM 826917106 157,182 227
2014-05-13 2014-03-31 13F SIGA TECHNOLOGIES COM 826917106 127,652 -36,296 -22.14 395 -26.31 0.0002
2014-02-13 2013-12-31 13F SIGA TECHNOLOGIES COM 826917106 163,948 124,786 318.64 536 259.73 0.0002
2013-11-13 2013-09-30 13F SIGA TECHNOLOGIES INC COM S COM 826917106 39,162 23,092 143.70 149 223.91 0.0001
2013-08-08 2013-06-30 13F SIGA TECHNOLOGIES INC COM S COM 826917106 16,070 16,070 46 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.