SIGA TECHNOLOGIES INC (SIGA) 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 June 30, 2026. The institutional investors covered on this page collectively reported approximately $126.55M 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 $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 $12.06M, representing an estimated loss of -20.88% 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
161
Total Reported Value
$126.55M
Largest Holder
Blackrock, Inc.
Largest Position
$15.24M
Insider Transactions (90d)
14
Latest Filing Quarter
Q2 2026
New Institutional Positions
46
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 | $12,056,492 | -$3,181,575 | -20.88% | |
| Dimensional Fund Advisors Lp | 0.00% | 2,719,568 | $9,899,037 | $7,832,356 | -$2,066,681 | -20.88% | |
| Altravue Capital, Llc | 0.61% | 2,327,144 | $8,470,804 | $6,702,175 | -$1,768,629 | -20.88% | |
| Vanguard Capital Management Llc | 0.00% | 1,712,701 | $6,234,232 | $4,932,579 | -$1,301,653 | -20.88% | |
| American Century Companies Inc | 0.00% | 1,506,065 | $5,482,077 | $4,337,467 | -$1,144,610 | -20.88% | |
| Arrowstreet Capital, Limited Partnership | 0.00% | 1,474,817 | $5,368,334 | $4,247,473 | -$1,120,861 | -20.88% | |
| Geode Capital Management, Llc | 0.00% | 1,417,092 | $5,159,233 | $4,081,225 | -$1,078,008 | -20.89% | |
| First Wilshire Securities Management Inc | 1.00% | 1,339,883 | $4,877,174 | $3,858,863 | -$1,018,311 | -20.88% | |
| Aqr Capital Management Llc | 0.00% | 1,245,992 | $4,535,410 | $3,588,457 | -$946,953 | -20.88% | |
| State Street Corp | 0.00% | 1,133,989 | $4,127,720 | $3,265,888 | -$861,832 | -20.88% | |
| Hotchkis & Wiley Capital Management Llc | 0.01% | 914,047 | $3,327,131 | $2,632,455 | -$694,676 | -20.88% | |
| Qube Research & Technologies Ltd | 0.00% | 740,910 | $2,696,912 | $2,133,821 | -$563,091 | -20.88% | |
| New York State Common Retirement Fund | 0.00% | 590,761 | $2,150,370 | $1,701,392 | -$448,978 | -20.88% | |
| Millennium Management Llc | 0.00% | 579,599 | $2,109,740 | $1,669,245 | -$440,495 | -20.88% | |
| Jacobs Levy Equity Management, Inc | 0.01% | 566,863 | $2,063,381 | $1,632,565 | -$430,816 | -20.88% | |
| Uniplan Investment Counsel, Inc. | 0.19% | 560,353 | $2,039,686 | $1,613,817 | -$425,869 | -20.88% | |
| Citadel Advisors Llc | 0.00% | 551,246 | $2,006,535 | $1,587,588 | -$418,947 | -20.88% | |
| Royce & Associates Lp | 0.02% | 551,010 | $2,005,676 | $1,586,909 | -$418,767 | -20.88% | |
| Vanguard Portfolio Management Llc | 0.00% | 549,697 | $2,000,897 | $1,583,127 | -$417,770 | -20.88% | |
| Legato Capital Management Llc | 0.15% | 512,039 | $1,863,822 | $1,474,672 | -$389,150 | -20.88% | |
| Bank Of America Corp | 0.00% | 427,275 | $1,555,282 | $1,230,552 | -$324,730 | -20.88% | |
| Renaissance Technologies LLC | Jim Simons | 0.00% | 425,800 | $1,549,912 | $1,226,304 | -$323,608 | -20.88% |
| Morgan Stanley | 0.00% | 421,009 | $1,532,474 | $1,212,506 | -$319,968 | -20.88% | |
| Denali Advisors Llc | 0.15% | 414,436 | $1,508,547 | $1,193,576 | -$314,971 | -20.88% | |
| Goldman Sachs Group Inc | 0.00% | 393,007 | $1,430,545 | $1,131,860 | -$298,685 | -20.88% | |
| Two Sigma Investments, Lp | 0.00% | 357,715 | $1,302,083 | $1,030,219 | -$271,864 | -20.88% | |
| Charles Schwab Investment Management Inc | 0.00% | 349,820 | $1,273,345 | $1,007,482 | -$265,863 | -20.88% | |
| Sixth Street Partners Management Company, L.P. | 0.00% | 349,820 | $1,273,345 | $1,007,482 | -$265,863 | -20.88% | |
| Northern Trust Corp | 0.00% | 333,833 | $1,215,152 | $961,439 | -$253,713 | -20.88% | |
| Vanguard Fiduciary Trust Co | 0.00% | 277,358 | $1,009,583 | $798,791 | -$210,792 | -20.88% | |
| Janus Henderson Group Plc | 0.00% | 187,521 | $1,003,237 | $540,060 | -$463,177 | -46.17% | |
| Segall Bryant & Hamill, Llc | 0.01% | 273,522 | $995,620 | $787,743 | -$207,877 | -20.88% | |
| Bank Of New York Mellon Corp | 0.00% | 265,684 | $967,089 | $765,170 | -$201,919 | -20.88% | |
| D. E. Shaw & Co., Inc. | 0.00% | 264,900 | $964,236 | $762,912 | -$201,324 | -20.88% | |
| Victory Capital Management Inc | 0.00% | 260,062 | $946,626 | $748,979 | -$197,647 | -20.88% | |
| Ameriprise Financial Inc | 0.00% | 193,368 | $703,860 | $556,900 | -$146,960 | -20.88% | |
| Ubs Group Ag | 0.00% | 181,998 | $662,473 | $524,154 | -$138,319 | -20.88% | |
| State Of Wisconsin Investment Board | 0.00% | 164,400 | $598,416 | $473,472 | -$124,944 | -20.88% | |
| First Trust Advisors Lp | 0.00% | 159,509 | $580,612 | $459,386 | -$121,226 | -20.88% | |
| Man Group Plc | 0.00% | 157,348 | $572,747 | $453,162 | -$119,585 | -20.88% | |
| Los Angeles Capital Management Llc | 0.00% | 145,060 | $528,019 | $417,773 | -$110,246 | -20.88% | |
| Strs Ohio | 0.00% | 134,200 | $488,488 | $386,496 | -$101,992 | -20.88% | |
| Campbell & Co Investment Adviser Llc | 0.02% | 121,177 | $441,084 | $348,990 | -$92,094 | -20.88% | |
| Invesco Ltd. | 0.00% | 113,091 | $411,651 | $325,702 | -$85,949 | -20.88% | |
| Alliancebernstein L.P. | 0.00% | 71,510 | $382,579 | $205,949 | -$176,630 | -46.17% | |
| Prudential Financial Inc | 0.00% | 104,190 | $379,252 | $300,067 | -$79,185 | -20.88% | |
| Summerhaven Investment Management, Llc | 0.20% | 101,025 | $367,731 | $290,952 | -$76,779 | -20.88% | |
| Nuveen, Llc | 0.00% | 100,899 | $367,272 | $290,589 | -$76,683 | -20.88% | |
| Martingale Asset Management L P | 0.01% | 92,341 | $336,122 | $265,942 | -$70,180 | -20.88% | |
| Jefferies Financial Group Inc. | 0.00% | 62,667 | $335,268 | $180,481 | -$154,787 | -46.17% |
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.