SIGA Institutional Ownership & Shareholders
SIGA TECHNOLOGIES INC (SIGA) is currently held by 158 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $126.79M based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of SIGA tracked by InsiderSet, reporting ownership valued at approximately $15.24M in its June 30, 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 $12.73M, representing an estimated loss of -16.48% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 55% 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
158
Total Reported Value
$126.79M
Largest Holder
Blackrock, Inc.
Largest Position
$15.24M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
43
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% | 4,186,282 | $15,238,067 | $12,726,297 | -$2,511,770 | -16.48% | |
| Dimensional Fund Advisors Lp | 0.00% | 2,719,568 | $9,899,037 | $8,267,487 | -$1,631,550 | -16.48% | |
| Altravue Capital, Llc | 0.61% | 2,327,144 | $8,470,804 | $7,074,518 | -$1,396,286 | -16.48% | |
| Vanguard Capital Management Llc | 0.00% | 1,712,701 | $6,234,232 | $5,206,611 | -$1,027,621 | -16.48% | |
| American Century Companies Inc | 0.00% | 1,506,065 | $5,482,077 | $4,578,438 | -$903,639 | -16.48% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 1,474,817 | $5,368,334 | $4,483,444 | -$884,890 | -16.48% | |
| Geode Capital Management, Llc | 0.00% | 1,417,092 | $5,159,233 | $4,307,960 | -$851,273 | -16.50% | |
| First Wilshire Securities Management Inc | 1.00% | 1,339,883 | $4,877,174 | $4,073,244 | -$803,930 | -16.48% | |
| Aqr Capital Management Llc | 0.00% | 1,245,992 | $4,535,410 | $3,787,816 | -$747,594 | -16.48% | |
| State Street Corp | 0.00% | 1,133,989 | $4,127,720 | $3,447,327 | -$680,393 | -16.48% | |
| Hotchkis & Wiley Capital Management Llc | 0.01% | 914,047 | $3,327,131 | $2,778,703 | -$548,428 | -16.48% | |
| Qube Research & Technologies Ltd | 0.00% | 740,910 | $2,696,912 | $2,252,366 | -$444,546 | -16.48% | |
| New York State Common Retirement Fund | 0.00% | 590,761 | $2,150,370 | $1,795,913 | -$354,457 | -16.48% | |
| Millennium Management Llc | 0.00% | 579,599 | $2,109,740 | $1,761,981 | -$347,759 | -16.48% | |
| Jacobs Levy Equity Management, Inc | 0.01% | 566,863 | $2,063,381 | $1,723,264 | -$340,117 | -16.48% | |
| Uniplan Investment Counsel, Inc. | 0.19% | 560,353 | $2,039,686 | $1,703,473 | -$336,213 | -16.48% | |
| Citadel Advisors Llc | 0.00% | 551,246 | $2,006,535 | $1,675,788 | -$330,747 | -16.48% | |
| Royce & Associates Lp | 0.02% | 551,010 | $2,005,676 | $1,675,070 | -$330,606 | -16.48% | |
| Vanguard Portfolio Management Llc | 0.00% | 549,697 | $2,000,897 | $1,671,079 | -$329,818 | -16.48% | |
| Legato Capital Management Llc | 0.15% | 512,039 | $1,863,822 | $1,556,599 | -$307,223 | -16.48% | |
| Lsv Asset Management | 0.00% | 461,307 | $1,679,000 | $1,402,373 | -$276,627 | -16.48% | |
| Bank Of America Corp | 0.00% | 427,275 | $1,555,282 | $1,298,916 | -$256,366 | -16.48% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 425,800 | $1,549,912 | $1,294,432 | -$255,480 | -16.48% |
| Morgan Stanley | 0.00% | 421,009 | $1,532,474 | $1,279,867 | -$252,607 | -16.48% | |
| Denali Advisors Llc | 0.15% | 414,436 | $1,508,547 | $1,259,885 | -$248,662 | -16.48% | |
| Goldman Sachs Group Inc | 0.00% | 393,007 | $1,430,545 | $1,194,741 | -$235,804 | -16.48% | |
| Two Sigma Investments, Lp | 0.00% | 357,715 | $1,302,083 | $1,087,454 | -$214,629 | -16.48% | |
| Charles Schwab Investment Management Inc | 0.00% | 349,820 | $1,273,345 | $1,063,453 | -$209,892 | -16.48% | |
| Northern Trust Corp | 0.00% | 333,833 | $1,215,152 | $1,014,852 | -$200,300 | -16.48% | |
| Vanguard Fiduciary Trust Co | 0.00% | 277,358 | $1,009,583 | $843,168 | -$166,415 | -16.48% | |
| Janus Henderson Group Plc | 0.00% | 187,521 | $1,003,237 | $570,064 | -$433,173 | -43.18% | |
| Segall Bryant & Hamill, Llc | 0.01% | 273,522 | $995,620 | $831,507 | -$164,113 | -16.48% | |
| Bank Of New York Mellon Corp | 0.00% | 265,684 | $967,089 | $807,679 | -$159,410 | -16.48% | |
| D. E. Shaw & Co., Inc. | 0.00% | 264,900 | $964,236 | $805,296 | -$158,940 | -16.48% | |
| Victory Capital Management Inc | 0.00% | 260,062 | $946,626 | $790,588 | -$156,038 | -16.48% | |
| Ameriprise Financial Inc | 0.00% | 193,368 | $703,860 | $587,839 | -$116,021 | -16.48% | |
| Ubs Group Ag | 0.00% | 181,998 | $662,473 | $553,274 | -$109,199 | -16.48% | |
| State Of Wisconsin Investment Board | 0.00% | 164,400 | $598,416 | $499,776 | -$98,640 | -16.48% | |
| First Trust Advisors Lp | 0.00% | 159,509 | $580,612 | $484,907 | -$95,705 | -16.48% | |
| Man Group Plc | 0.00% | 157,348 | $572,747 | $478,338 | -$94,409 | -16.48% | |
| Davenport & Co Llc | 0.00% | 160,000 | $544,000 | $486,400 | -$57,600 | -10.59% | |
| Los Angeles Capital Management Llc | 0.00% | 145,060 | $528,019 | $440,982 | -$87,037 | -16.48% | |
| Campbell & Co Investment Adviser Llc | 0.02% | 121,177 | $441,084 | $368,378 | -$72,706 | -16.48% | |
| Invesco Ltd. | 0.00% | 113,091 | $411,651 | $343,797 | -$67,854 | -16.48% | |
| Alliancebernstein L.P. | 0.00% | 71,510 | $382,579 | $217,390 | -$165,189 | -43.18% | |
| Prudential Financial Inc | 0.00% | 104,190 | $379,252 | $316,738 | -$62,514 | -16.48% | |
| Strs Ohio | 0.00% | 109,800 | $373,320 | $333,792 | -$39,528 | -10.59% | |
| Nuveen, Llc | 0.00% | 100,899 | $367,272 | $306,733 | -$60,539 | -16.48% | |
| Martingale Asset Management L P | 0.01% | 92,341 | $336,122 | $280,717 | -$55,405 | -16.48% | |
| Klp Kapitalforvaltning As | 0.00% | 87,200 | $317,408 | $265,088 | -$52,320 | -16.48% |
Frequently asked questions about SIGA
Who are the largest institutional holders of SIGA?
The largest institutional holders of SIGA reported in the latest SEC Form 13F filings include Blackrock, Inc., Dimensional Fund Advisors Lp, Altravue Capital, Llc, Vanguard Capital Management Llc, and American Century Companies Inc. InsiderSet ranks institutional holders by their latest reported SIGA position.
What is SIGA institutional ownership?
This page tracks SIGA positions reported by institutional investment managers through SEC Form 13F. SIGA TECHNOLOGIES INC (SIGA) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own SIGA?
InsiderSet currently tracks 158 institutional managers reporting SIGA holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of SIGA shareholders.
How much SIGA stock do institutions own?
Institutional investment managers disclosed approximately $126.79M in SIGA holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was SIGA institutional ownership last updated?
The latest SIGA institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional SIGA holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its SIGA position after the reporting date.
Are institutions buying or selling SIGA?
Institutional buying and selling can be analyzed by comparing SIGA positions across consecutive 13F reporting periods. InsiderSet's SIGA Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View SIGA ownership changes.
How has SIGA institutional ownership changed over time?
InsiderSet tracks SIGA institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.