Ranked by reported Q2 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. | 4.2M | $15.2M | +19.8% | 5.837% | 0.00% |
| 2 | DIMENSIONAL FUND ADVISORS LP | 2.7M | $9.9M | +0.6% | 3.792% | 0.00% |
| 3 | AltraVue Capital, LLC | 2.3M | $8.5M | -4.3% | 3.245% | 0.61% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 1.7M | $6.2M | -0.1% | 2.388% | 0.00% |
| 5 | AMERICAN CENTURY COMPANIES INC | 1.5M | $5.5M | +14.3% | 2.100% | 0.00% |
| 6 | ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 1.5M | $5.4M | -3.4% | 2.056% | 0.00% |
| 7 | GEODE CAPITAL MANAGEMENT, LLC | 1.4M | $5.2M | +7.7% | 1.976% | 0.00% |
| 8 | FIRST WILSHIRE SECURITIES MANAGEMENT INC | 1.3M | $4.9M | +50.5% | 1.868% | 1.00% |
| 9 | AQR CAPITAL MANAGEMENT LLC | 1.2M | $4.5M | +2.2% | 1.737% | 0.00% |
| 10 | STATE STREET CORP | 1.1M | $4.1M | +12.1% | 1.581% | 0.00% |
| 11 | HOTCHKIS & WILEY CAPITAL MANAGEMENT LLC | 914K | $3.3M | +10.5% | 1.274% | 0.01% |
| 12 | Qube Research & Technologies Ltd | 741K | $2.7M | +78.5% | 1.033% | 0.00% |
| 13 | NEW YORK STATE COMMON RETIREMENT FUND | 591K | $2.2M | 0.0% | 0.824% | 0.00% |
| 14 | MILLENNIUM MANAGEMENT LLC | 580K | $2.1M | +24.3% | 0.808% | 0.00% |
| 15 | JACOBS LEVY EQUITY MANAGEMENT, INC | 567K | $2.1M | +94.2% | 0.790% | 0.01% |
| 16 | Uniplan Investment Counsel, Inc. | 560K | $2.0M | +50.9% | 0.781% | 0.10% |
| 17 | CITADEL ADVISORS LLC | 551K | $2.0M | -21.8% | 0.769% | 0.00% |
| 18 | ROYCE & ASSOCIATES LP | 551K | $2.0M | -17.5% | 0.768% | 0.02% |
| 19 | VANGUARD PORTFOLIO MANAGEMENT LLC | 550K | $2.0M | -6.3% | 0.766% | 0.00% |
| 20 | Legato Capital Management LLC | 512K | $1.9M | 0.0% | 0.714% | 0.15% |
| 21 | BANK OF AMERICA CORP /DE/ | 427K | $1.6M | -11.8% | 0.596% | 0.00% |
| 22 | RENAISSANCE TECHNOLOGIES LLC | 426K | $1.5M | -10.4% | 0.594% | 0.00% |
| 23 | MORGAN STANLEY | 421K | $1.5M | +59.9% | 0.587% | 0.00% |
| 24 | DENALI ADVISORS LLC | 414K | $1.5M | -5.1% | 0.578% | 0.15% |
| 25 | GOLDMAN SACHS GROUP INC | 393K | $1.4M | -37.1% | 0.548% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). “% of Fund” shows how much of that investor’s total 13F portfolio is invested in SIGA — a direct measure of their conviction.
Filings activity in SIGA during Q2 2026, grouped by how each filer changed its position.
Institutions that opened a new SIGA position in Q2 2026
Institutions that fully closed their SIGA position in Q2 2026
8 quarters of 13F filings · Δ columns show change vs prior quarter
| Quarter | Inst. Holders | Δ Holders | Ownership % | Δ Ownership | Total 13F Value | Δ Value |
|---|---|---|---|---|---|---|
| Q2 2026 | 162 | 12% | 48.64% | +0.49 pp | $125M | 30% |
| Q1 2026 | 184 | 7.1% | 48.15% | 1.85 pp | $178M | 15% |
| Q4 2025 | 198 | +2.1% | 50.00% | +2.39 pp | $209M | 30% |
| Q3 2025 | 194 | +9.0% | 47.61% | 0.81 pp | $300M | +40% |
| Q2 2025 | 178 | +9.2% | 48.42% | +0.79 pp | $214M | +20% |
| Q1 2025 | 163 | 3.6% | 47.63% | +0.21 pp | $179M | 1.2% |
| Q4 2024 | 169 | +1.2% | 47.42% | 2.18 pp | $181M | 16% |
| Q3 2024 | 167 | — | 49.60% | — | $215M | — |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Δ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying SIGA stock.
Based on Q2 2026 13F filings, institutional ownership of SIGA Technologies, Inc. stands at 48.6%, held across 162 reporting institutions.
BlackRock, Inc. is the largest reported institutional holder of SIGA, with approximately 4,186,282 shares worth $0.02B as of Q2 2026.
Yes — 3 widely-followed marquee investors appear among the top 25 institutional holders of SIGA, including MILLENNIUM MANAGEMENT LLC, CITADEL ADVISORS LLC, RENAISSANCE TECHNOLOGIES LLC.
Our composite Smart Money Score for SIGA is 57 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
14 institutions opened new positions in SIGA during Q2 2026, while 32 fully exited. 35 added to existing positions and 109 trimmed.
SIGA institutional ownership rose by 0.49 percentage points quarter-over-quarter, with a net change of -22 holders.
The top 10 institutions account for 55.5% of all reported 13F value in SIGA, and the top 25 account for 79.4%.
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