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 2026-08-14, as of 2026-08-14)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common stock | NSPR · NASDAQ | 46,489,118 | 24,925,969 | 53.6% | 37 | 45779A846 |
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 (37 of 37 · 45779A846)
change vs 2026-03-31| # | Filer | Shares | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | Nantahala Capital Management, LLC | 6,752,968 | 14.53% | $4.7M | +3,376,484 (+100.0%) |
| 2 | Rosalind Advisors, Inc. | 3,905,743 | 8.40% | $2.7M | — |
| 3 | Aberdeen Group plc | 3,698,364 | 7.96% | $2.6M | +525,000 (+16.5%) |
| 4 | ORBIMED ADVISORS LLC | 3,133,405 | 6.74% | $2.2M | — |
| 5 | Parkman Healthcare Partners LLC | 2,416,518 | 5.20% | $1.7M | — |
| 6 | MARSHALL WACE, LLP | 1,860,405 | 4.00% | $1.3M | — |
| 7 | Soleus Capital Management, L.P. | 1,045,708 | 2.25% | $732K | — |
| 8 | PURA VIDA INVESTMENTS, LLC | 450,517 | 0.97% | $315K | — |
| 9 | INGALLS & SNYDER LLC | 368,800 | 0.79% | $258K | -10,500 (-2.8%) |
| 10 | Affiance Financial, LLC | 250,370 | 0.54% | $175K | — |
| 11 | Velan Capital Investment Management LP | 148,138 | 0.32% | $104K | -1,951,514 (-92.9%) |
| 12 | BlackRock, Inc. | 122,993 | 0.26% | $86K | +42,544 (+52.9%) |
| 13 | RENAISSANCE TECHNOLOGIES LLC | 112,832 | 0.24% | $79K | +95,223 (+540.8%) |
| 14 | Creative Planning | 108,964 | 0.23% | $76K | +89,250 (+452.7%) |
| 15 | Schonfeld Strategic Advisors LLC | 99,275 | 0.21% | $70K | NEW |
| 16 | HRT FINANCIAL LP | 59,754 | 0.13% | $41K | NEW |
| 17 | XTX Topco Ltd | 49,029 | 0.11% | $34K | +36,671 (+296.7%) |
| 18 | Centiva Capital, LP | 44,123 | 0.09% | $31K | +19,357 (+78.2%) |
| 19 | Cambridge Investment Research Advisors, Inc. | 40,332 | 0.09% | $28K | NEW |
| 20 | MILLENNIUM MANAGEMENT LLC | 37,677 | 0.08% | $26K | -74,746 (-66.5%) |
| 21 | Mesirow Financial Investment Management, Inc. | 30,000 | 0.06% | $21K | — |
| 22 | COURIER CAPITAL LLC | 30,000 | 0.06% | $21K | — |
| 23 | MORGAN STANLEY | 28,371 | 0.06% | $20K | -11,465 (-28.8%) |
| 24 | VESTIA PERSONAL WEALTH ADVISORS | 24,425 | 0.05% | $17K | — |
| 25 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 20,594 | 0.04% | $14K | NEW |
| 26 | LPL Financial LLC | 18,621 | 0.04% | $13K | NEW |
| 27 | OSAIC HOLDINGS, INC. | 15,952 | 0.03% | $11K | +5,500 (+52.6%) |
| 28 | Avestar Capital, LLC | 15,000 | 0.03% | $11K | — |
| 29 | Pallas Capital Advisors LLC | 11,000 | 0.02% | $8K | -2,000 (-15.4%) |
| 30 | McKinley Carter Wealth Services, Inc. | 10,000 | 0.02% | $7K | — |
| 31 | AdvisorNet Financial, Inc | 8,783 | 0.02% | $6K | — |
| 32 | UBS Group AG | 5,314 | 0.01% | $4K | +3,216 (+153.3%) |
| 33 | Farther Finance Advisors, LLC | 1,000 | 0.00% | $700 | — |
| 34 | SIMPLEX TRADING, LLC | 745 | 0.00% | $521 | +142 (+23.5%) |
| 35 | ROYAL BANK OF CANADA | 247 | 0.00% | $0 | +67 (+37.2%) |
| 36 | Caitong International Asset Management Co., Ltd | 1 | 0.00% | $1 | NEW |
| 37 | CITIGROUP INC | 1 | 0.00% | $1 | NEW |
Exited since 2026-03-31 (5 filers; largest 5 shown)
| ESSEX INVESTMENT MANAGEMENT CO LLC | −114,085 |
| CITADEL ADVISORS LLC | −65,750 |
| NORTHERN TRUST CORP | −33,572 |
| Legato Capital Management LLC | −26,850 |
| GEODE CAPITAL MANAGEMENT, LLC | −18,244 |
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/A | 2026-05-15 | 2026-03-31 | 4,819,647 | 9.99% |
| Venkataraman Balaji | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 2,347,779 | 4.99% |
| Velan Capital Master Fund LP | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 2,347,779 | 4.99% |
| Daniel Mack | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 4,819,647 | 9.99% |
| Velan Capital Management LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 2,347,779 | 4.99% |
| Velan Capital Investment Management LP | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 2,347,779 | 4.99% |
| Velan Capital Holdings LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 2,347,779 | 4.99% |
| Morgan Adam | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 2,347,779 | 4.99% |
| Nantahala Capital Management, LLC | SCHEDULE 13G/A | 2026-05-15 | 2026-03-31 | 4,819,647 | 9.99% |
| Marvin Slosman | SCHEDULE 13D | 2026-04-24 | 2026-01-22 | 2,556,760 | 5.18% |
| ORBIMED ADVISORS LLC | SCHEDULE 13G | 2026-02-17 | 2025-12-31 | 3,133,405 | 7.4% |
| OrbiMed Capital GP IX LLC | SCHEDULE 13G | 2026-02-17 | 2025-12-31 | 2,878,704 | 6.8% |
| Rosalind Master Fund L.P. | SCHEDULE 13G/A | 2026-02-11 | 2025-12-31 | 9,485,697 | 8.3% |
| Rosalind Opportunities Fund I L.P. | SCHEDULE 13G/A | 2026-02-11 | 2025-12-31 | 1,501,407 | 1% |
| Aharon Gil | SCHEDULE 13G/A | 2026-02-11 | 2025-12-31 | 10,987,104 | 9.2% |
| SALAMON STEVEN A J | SCHEDULE 13G/A | 2026-02-11 | 2025-12-31 | 10,987,104 | 9.2% |
| Rosalind Advisors, Inc. | SCHEDULE 13G/A | 2026-02-11 | 2025-12-31 | 10,987,104 | 9.2% |
| abrdn Inc. | SCHEDULE 13G/A | 2026-02-02 | 2025-12-31 | 3,173,364 | 7.49% |
| Aberdeen Group plc | SCHEDULE 13G/A | 2026-02-02 | 2025-12-31 | 3,173,364 | 7.49% |
| Parkman Healthcare Partners LLC | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 2,440,633 | 5.8% |
| NANTAHALA CAPITAL PARTNERS LIMITED PARTNERSHIP | SCHEDULE 13G/A | 2025-11-14 | 2025-09-30 | 2,418,016 | 5.6761% |
| Martinez Gregory | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 2,440,633 | 5.8% |
| MARSHALL WACE, LLP | SCHEDULE 13G/A | 2025-11-14 | 2025-09-30 | 28,103,699 | 9.99% |
| Parkman Healthcare Partners Holdings LP | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 2,440,633 | 5.8% |
| Parkman Healthcare Partners Holdings GP LLC | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 2,440,633 | 5.8% |
| Michael A. Lawless | SCHEDULE 13D | 2025-10-29 | 2025-06-26 | 3,614,731 | 8.6% |
| Craig Shore | SCHEDULE 13D/A | 2025-10-29 | 2025-06-26 | 1,484,505 | 3.5% |
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.