Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in SIGA held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 3.5M | $18.7M | -2.6% | 4.872% | 0.00% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 2.7M | $14.5M | +6.5% | 3.768% | 0.00% |
| 3 | AltraVue Capital, LLC | 2.4M | $13.0M | +1.0% | 3.391% | 1.12% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.7M | $9.2M | β | 2.390% | 0.00% |
| 5 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.5M | $8.2M | +48.9% | 2.127% | 0.00% |
| 6 | AMERICAN CENTURY COMPANIES INC | 1.3M | $7.1M | +13.1% | 1.837% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 1.3M | $7.0M | +30.9% | 1.834% | 0.00% |
| 8 | AQR CAPITAL MANAGEMENT LLC | 1.2M | $6.5M | +39.7% | 1.700% | 0.00% |
| 9 | STATE STREET CORP | 1.0M | $5.4M | -5.9% | 1.411% | 0.00% |
| 10 | FIRST WILSHIRE SECURITIES MANAGEMENT INC | 890K | $4.8M | +30.2% | 1.242% | 1.07% |
| 11 | HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 827K | $4.4M | +0.9% | 1.153% | 0.01% |
| 12 | CITADEL ADVISORS LLC | 705K | $3.8M | -34.0% | 0.983% | 0.00% |
| 13 | ROYCE & ASSOCIATES LP | 668K | $3.6M | +9.3% | 0.931% | 0.04% |
| 14 | GOLDMAN SACHS GROUP INC | 625K | $3.3M | -3.4% | 0.871% | 0.00% |
| 15 | NEW YORK STATE COMMON RETIREMENT FUND | 591K | $3.2M | +3.5% | 0.824% | 0.00% |
| 16 | VANGUARD PORTFOLIO MANAGEMENT LLC | 587K | $3.1M | β | 0.818% | 0.00% |
| 17 | Legato Capital Management LLC | 512K | $2.7M | -11.8% | 0.714% | 0.25% |
| 18 | BANK OF AMERICA CORP /DE/ | 485K | $2.6M | -24.4% | 0.676% | 0.00% |
| 19 | RENAISSANCE TECHNOLOGIES LLC | 475K | $2.5M | +25.6% | 0.662% | 0.00% |
| 20 | MILLENNIUM MANAGEMENT LLC | 466K | $2.5M | -4.7% | 0.650% | 0.00% |
| 21 | D. E. Shaw & Co., Inc. | 456K | $2.4M | -17.7% | 0.636% | 0.00% |
| 22 | DENALI ADVISORS LLC | 437K | $2.3M | +20.8% | 0.609% | 0.26% |
| 23 | TWO SIGMA INVESTMENTS, LP | 434K | $2.3M | +4069.8% | 0.605% | 0.00% |
| 24 | Qube Research & Technologies Ltd | 415K | $2.2M | +151.8% | 0.579% | 0.00% |
| 25 | VICTORY CAPITAL MANAGEMENT INC | 377K | $2.0M | +10.8% | 0.525% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in SIGA β a direct measure of their conviction.
Filings activity in SIGA during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new SIGA position in Q1 2026
Institutions that fully closed their SIGA position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 180 | 8.6% | 57.09% | 10.23 pp | $177M | 15% |
| Q4 2025 | 197 | +2.1% | 67.32% | 29.32 pp | $209M | 30% |
| Q3 2025 | 193 | +8.4% | 96.64% | +27.47 pp | $299M | +40% |
| Q2 2025 | 178 | +9.2% | 69.17% | +11.49 pp | $214M | +20% |
| Q1 2025 | 163 | 3.6% | 57.68% | 0.69 pp | $179M | 1.2% |
| Q4 2024 | 169 | +1.2% | 58.37% | 10.89 pp | $181M | 16% |
| Q3 2024 | 167 | +11% | 69.26% | 2.25 pp | $215M | 3.1% |
| Q2 2024 | 150 | β | 71.51% | β | $222M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying SIGA stock.
Based on Q1 2026 13F filings, institutional ownership of SIGA Technologies, Inc. stands at 57.1%, held across 180 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of SIGA, with approximately 3,494,193 shares worth $0.02B as of Q1 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of SIGA, including CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC, MILLENNIUM MANAGEMENT LLC, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for SIGA is 44 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
28 institutions opened new positions in SIGA during Q1 2026, while 45 fully exited. 42 added to existing positions and 106 trimmed.
SIGA institutional ownership fell by 10.23 percentage points quarter-over-quarter, with a net change of -17 holders.
The top 10 institutions account for 53.3% of all reported 13F value in SIGA, and the top 25 account for 77.7%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
SIGA Technologies, Inc. (SIGA) Institutional Ownership