Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Share classes (cover page of the 10-Q filed 2026-08-12, as of 2026-08-11)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | AZTR · NYSEAMER | 60,603,742 | 21,631,382 | 35.7% | 14 | 05479L302 |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (14 of 14 · 05479L302)
change vs 2026-03-31| # | Filer | Shares | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | Dauntless Investment Group, LLC | 11,292,186 | 18.63% | $1.9M | +11,291,186 (+1129118.6%) |
| 2 | Stonepine Capital Management, LLC | 5,285,476 | 8.72% | $887K | NEW |
| 3 | Nantahala Capital Management, LLC | 4,427,226 | 7.31% | $743K | NEW |
| 4 | JANE STREET GROUP, LLC | 248,433 | 0.41% | $42K | NEW |
| 5 | GEODE CAPITAL MANAGEMENT, LLC | 95,409 | 0.16% | $16K | -374,469 (-79.7%) |
| 6 | CITADEL ADVISORS LLC | 86,242 | 0.14% | $14K | NEW |
| 7 | Virtu Financial LLC | 64,940 | 0.11% | $11K | NEW |
| 8 | UBS Group AG | 50,481 | 0.08% | $8K | +20,276 (+67.1%) |
| 9 | StoneX Group Inc. | 28,651 | 0.05% | $5K | +6,187 (+27.5%) |
| 10 | Tower Research Capital LLC (TRC) | 19,500 | 0.03% | $3K | +4,415 (+29.3%) |
| 11 | Corient Private Wealth LP | 14,451 | 0.02% | $2K | NEW |
| 12 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 12,237 | 0.02% | $2K | NEW |
| 13 | CITIGROUP INC | 6,149 | 0.01% | $1K | +4,444 (+260.6%) |
| 14 | BARCLAYS PLC | 1 | 0.00% | $0 | NEW |
Exited since 2026-03-31 (1 filers; largest 1 shown)
| FMR LLC | −150 |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| Wilmot B. Harkey | SCHEDULE 13G | 2026-08-14 | 2026-06-30 | 6,480,584 | 9.99% |
| NANTAHALA CAPITAL PARTNERS LIMITED PARTNERSHIP | SCHEDULE 13G | 2026-08-14 | 2026-06-30 | 5,448,213 | 8.4% |
| Nantahala Capital Management, LLC | SCHEDULE 13G | 2026-08-14 | 2026-06-30 | 6,480,584 | 9.99% |
| Daniel Mack | SCHEDULE 13G | 2026-08-14 | 2026-06-30 | 6,480,584 | 9.99% |
| Dauntless Investment Group, LLC | SCHEDULE 13G | 2026-06-25 | 2026-06-24 | 5,804,636 | 9.6% |
| Salva Francisco D. | SCHEDULE 13D | 2026-06-24 | 2026-06-16 | 5,421,039 | 9.99% |
| Stonepine Capital Management, LLC | SCHEDULE 13G | 2026-06-22 | 2026-06-16 | 1,744,339 | 9.9% |
| Jon M. Plexico | SCHEDULE 13G | 2026-06-22 | 2026-06-16 | 1,744,339 | 9.9% |
| Stonepine GP, LLC | SCHEDULE 13G | 2026-06-22 | 2026-06-16 | 1,744,339 | 9.9% |
| Stonepine Capital, L.P. | SCHEDULE 13G | 2026-06-22 | 2026-06-16 | 1,744,339 | 9.9% |
| Ashkan Mapar | SCHEDULE 13G/A | 2025-12-19 | 2025-11-25 | 1,132,622 | 9.99% |
| Alumni Capital LP | SCHEDULE 13G/A | 2025-12-19 | 2025-11-25 | 1,132,622 | 9.99% |
| Alumni Capital GP LLC | SCHEDULE 13G/A | 2025-12-19 | 2025-11-25 | 1,132,622 | 9.99% |
| L1 Capital Global Opportunities Master Fund, Ltd. | SCHEDULE 13G/A | 2025-11-14 | 2025-11-14 | 273,497 | 2.6% |
| Alto Opportunity Master Fund, SPC - Segregated Master Portfolio B | SCHEDULE 13G | 2025-05-14 | 2025-03-31 | 1,662,525 | 9.99% |
| Waqas Khatri | SCHEDULE 13G | 2025-05-14 | 2025-03-31 | 1,662,525 | 9.99% |
| Ayrton Capital LLC | SCHEDULE 13G | 2025-05-14 | 2025-03-31 | 1,662,525 | 9.99% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.