SIGA TECHNOLOGIES INC (SIGA) Top Institutional Shareholders
SIGA TECHNOLOGIES INC (SIGA) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $176.90M in SIGA holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of SIGA tracked by InsiderSet, reporting ownership valued at approximately $18.69M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $15.06M, representing an estimated loss of -19.44% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 53% of the total disclosed SIGA value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Dimensional Fund Advisors Lp, Altravue Capital, Llc, and several other long-term asset managers with concentrated positions in SIGA TECHNOLOGIES INC (SIGA).
This page ranks the largest institutional SIGA shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
179
Total Reported Value
$176.90M
Largest Holder
Blackrock, Inc.
Largest Position
$18.69M
Insider Transactions (90d)
0
Latest Filing Quarter
Q1 2026
New Institutional Positions
167
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 3,494,193 | $18,693,934 | $15,059,972 | -$3,633,962 | -19.44% | |
| Dimensional Fund Advisors Lp | 0.00% | 2,702,724 | $14,459,148 | $11,648,740 | -$2,810,408 | -19.44% | |
| Altravue Capital, Llc | 1.12% | 2,432,024 | $13,011,328 | $10,482,023 | -$2,529,305 | -19.44% | |
| Vanguard Capital Management Llc | 0.00% | 1,714,380 | $9,171,933 | $7,388,978 | -$1,782,955 | -19.44% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 1,525,960 | $8,163,886 | $6,576,888 | -$1,586,998 | -19.44% | |
| American Century Companies Inc | 0.00% | 1,317,784 | $7,050,144 | $5,679,649 | -$1,370,495 | -19.44% | |
| Geode Capital Management, Llc | 0.00% | 1,315,545 | $7,039,567 | $5,669,999 | -$1,369,568 | -19.46% | |
| Aqr Capital Management Llc | 0.00% | 1,219,677 | $6,525,272 | $5,256,808 | -$1,268,464 | -19.44% | |
| State Street Corp | 0.00% | 1,011,938 | $5,413,868 | $4,361,453 | -$1,052,415 | -19.44% | |
| First Wilshire Securities Management Inc | 1.07% | 890,498 | $4,764,164 | $3,838,046 | -$926,118 | -19.44% | |
| Hotchkis & Wiley Capital Management Llc | 0.01% | 827,047 | $4,424,701 | $3,564,573 | -$860,128 | -19.44% | |
| Citadel Advisors Llc | 0.00% | 705,137 | $3,772,483 | $3,039,140 | -$733,343 | -19.44% | |
| Royce & Associates Lp | 0.04% | 667,646 | $3,571,906 | $2,877,554 | -$694,352 | -19.44% | |
| Goldman Sachs Group Inc | 0.00% | 624,903 | $3,343,231 | $2,693,332 | -$649,899 | -19.44% | |
| New York State Common Retirement Fund | 0.00% | 590,761 | $3,160,571 | $2,546,180 | -$614,391 | -19.44% | |
| Vanguard Portfolio Management Llc | 0.00% | 586,974 | $3,140,311 | $2,529,858 | -$610,453 | -19.44% | |
| Legato Capital Management Llc | 0.25% | 512,039 | $2,739,409 | $2,206,888 | -$532,521 | -19.44% | |
| Bank Of America Corp | 0.00% | 484,672 | $2,592,996 | $2,088,936 | -$504,060 | -19.44% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 475,013 | $2,541,320 | $2,047,306 | -$494,014 | -19.44% |
| Millennium Management Llc | 0.00% | 466,324 | $2,494,833 | $2,009,856 | -$484,977 | -19.44% | |
| D. E. Shaw & Co., Inc. | 0.00% | 456,385 | $2,441,660 | $1,967,019 | -$474,641 | -19.44% | |
| Denali Advisors Llc | 0.26% | 436,887 | $2,337,345 | $1,882,983 | -$454,362 | -19.44% | |
| Two Sigma Investments, Lp | 0.00% | 433,661 | $2,320,086 | $1,869,079 | -$451,007 | -19.44% | |
| Qube Research & Technologies Ltd | 0.00% | 415,104 | $2,220,806 | $1,789,098 | -$431,708 | -19.44% | |
| Victory Capital Management Inc | 0.00% | 376,571 | $2,014,655 | $1,623,021 | -$391,634 | -19.44% | |
| Uniplan Investment Counsel, Inc. | 0.20% | 371,413 | $1,987,060 | $1,600,790 | -$386,270 | -19.44% | |
| Charles Schwab Investment Management Inc | 0.00% | 340,321 | $1,820,717 | $1,466,784 | -$353,933 | -19.44% | |
| Northern Trust Corp | 0.00% | 340,175 | $1,819,937 | $1,466,154 | -$353,783 | -19.44% | |
| Jacobs Levy Equity Management, Inc | 0.01% | 291,846 | $1,561,376 | $1,257,856 | -$303,520 | -19.44% | |
| Vanguard Fiduciary Trust Co | 0.00% | 275,178 | $1,472,202 | $1,186,017 | -$286,185 | -19.44% | |
| Morgan Stanley | 0.00% | 263,335 | $1,408,846 | $1,134,974 | -$273,872 | -19.44% | |
| Bank Of New York Mellon Corp | 0.00% | 256,803 | $1,373,897 | $1,106,821 | -$267,076 | -19.44% | |
| Nomura Asset Management International Inc. | 0.00% | 244,853 | $1,310,000 | $1,055,316 | -$254,684 | -19.44% | |
| Macquarie Group Ltd | 0.01% | 244,853 | $1,309,964 | $1,055,316 | -$254,648 | -19.44% | |
| Janus Henderson Group Plc | 0.00% | 187,521 | $1,003,237 | $808,216 | -$195,021 | -19.44% | |
| Ameriprise Financial Inc | 0.00% | 183,537 | $981,924 | $791,044 | -$190,880 | -19.44% | |
| State Of Wisconsin Investment Board | 0.00% | 177,800 | $951,230 | $766,318 | -$184,912 | -19.44% | |
| Creative Planning | 0.00% | 168,555 | $901,769 | $726,472 | -$175,297 | -19.44% | |
| First Trust Advisors Lp | 0.00% | 160,355 | $857,899 | $691,130 | -$166,769 | -19.44% | |
| State Board Of Administration Of Florida Retirement System | 0.00% | 131,626 | $704,199 | $567,308 | -$136,891 | -19.44% | |
| Winton Group Ltd | 0.02% | 124,391 | $665,492 | $536,125 | -$129,367 | -19.44% | |
| Invesco Ltd. | 0.00% | 111,518 | $596,622 | $480,643 | -$115,979 | -19.44% | |
| Strs Ohio | 0.00% | 109,900 | $587,965 | $473,669 | -$114,296 | -19.44% | |
| O'Shaughnessy Asset Management, Llc | 0.00% | 107,138 | $573,188 | $461,765 | -$111,423 | -19.44% | |
| Ubs Group Ag | 0.00% | 104,062 | $556,732 | $448,507 | -$108,225 | -19.44% | |
| Summerhaven Investment Management, Llc | 0.33% | 101,025 | $540,484 | $435,418 | -$105,066 | -19.44% | |
| Nuveen, Llc | 0.00% | 100,899 | $539,809 | $434,875 | -$104,934 | -19.44% | |
| Prudential Financial Inc | 0.00% | 100,590 | $538,157 | $433,543 | -$104,614 | -19.44% | |
| Point Nemo Capital, Llc | 0.21% | 85,553 | $522,729 | $368,733 | -$153,996 | -29.46% | |
| Man Group Plc | 0.00% | 94,513 | $505,645 | $407,351 | -$98,294 | -19.44% |
Frequently asked questions about SIGA
Who owns the most SIGA stock?
The largest holders of SIGA are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for SIGA TECHNOLOGIES INC (SIGA).
Is SIGA widely held by superinvestors?
Many widely followed stocks like SIGA appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly SIGA is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.